I'm new to Python, and I want to test if a certain point lies ON the (boundary) of a polygon - not inside, not outside, just if it's on the boundary. The points and polygon already defined
polygon = [(3, 2), (5, 1), (7, 2), (8, 6), (9, 7), (11, 6), (10, 4), (12, 2), (15, 2), (16, 5), (19, 7), (18, 11), (14, 12), (11, 9), (5, 9), (2, 6)]
Point_X = 14
Point_Y = 12
this point should be a boundary. How can I do that?
I'm having some compatibility problems with PyQt5, as expected some of the scripts I wrote are not working.
My biggest issues are with these two PyQt4 functions:
layer.pendingFields()
layer = QgsMapLayerRegistry.instance().mapLayersByName('Layer_Name')[0]
Is there a comparable function in PyQt5?
Does it work like the old functions?
In general it would be great to have something like a dictionary, where you could look for the old function and see the relate translation or substitutes in PyQt5.
Answer
I'm assuming when you say "PyQt5", you mean you are using QGIS 3.x. In which case:
layer.pendingFields()
becomes:
layer.fields()
And:
layer = QgsMapLayerRegistry.instance().mapLayersByName('Layer_Name')[0]
becomes:
layer = QgsProject.instance().mapLayersByName('Layer_Name')[0]
You can read here about the API changes and here for the PyQt4 and PyQt5 differences.
I have an ASCII file with latitude, longitude, and data_val in the following format.
35-13.643782N, 080-57.190157W, 118.6
...
I have a GeoTiff image file, and I can easily view it.
I want to place a "pin" (can be a dot/flag/star or whatever is easiest) on the image at the specific latitude/longitude position found in the ASCII file.
Here is what I've managed to do so far:
My source image looks like this:
Driver: GTiff/GeoTIFF
Files: /tmp/Charlotte SEC 100.tif
Size is 16867, 12358
Coordinate System is:
PROJCS["Lambert Conformal Conic",
GEOGCS["NAD83",
DATUM["North_American_Datum_1983",
SPHEROID["GRS 1980",6378137,298.2572221010042,
AUTHORITY["EPSG","7019"]],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4269"]],
PROJECTION["Lambert_Conformal_Conic_2SP"],
PARAMETER["standard_parallel_1",38.66666666666666],
PARAMETER["standard_parallel_2",33.33333333333334],
PARAMETER["latitude_of_origin",34.11666666666667],
PARAMETER["central_meridian",-78.75],
PARAMETER["false_easting",0],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]]]
Origin = (-365041.822331817995291,240536.419747152860509)
Pixel Size = (42.334586069440391,-42.334898968590878)
Metadata:
AREA_OR_POINT=Area
TIFFTAG_DATETIME=2016:06:24 12:46:45
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
TIFFTAG_SOFTWARE=Adobe Photoshop CS5 Windows
TIFFTAG_XRESOLUTION=300
TIFFTAG_YRESOLUTION=300
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( -365041.822, 240536.420) ( 82d48'55.43"W, 36d13' 4.92"N)
Lower Left ( -365041.822, -282638.262) ( 82d35'10.11"W, 31d30'17.00"N)
Upper Right ( 349015.641, 240536.420) ( 74d51'46.40"W, 36d13'26.16"N)
Lower Right ( 349015.641, -282638.262) ( 75d 4'55.60"W, 31d30'36.99"N)
Center ( -8013.091, -21050.921) ( 78d50'12.11"W, 33d55'36.35"N)
Band 1 Block=16867x1 Type=Byte, ColorInterp=Palette
Color Table (RGB with 256 entries)
0: 255,255,255,255
...
Here is what I've managed to cobble together in Python:
from osgeo import gdal, osr
src_filename = '/tmp/Charlotte SEC 100.tif'
dst_filename = '/tmp/foo.tiff'
# Opens source dataset
src_ds = gdal.Open(src_filename)
format = "GTiff"
driver = gdal.GetDriverByName(format)
# Open destination dataset
dst_ds = driver.CreateCopy(dst_filename, src_ds, 0)
# Specify raster location through geotransform array
# (upperleftx, scalex, skewx, upperlefty, skewy, scaley)
# Scale = size of one pixel in units of raster projection
# this example below assumes 100x100
gt = [-365041.822, 100, 0, 240536.420, 0, -100]
# Set location
dst_ds.SetGeoTransform(gt)
# Get raster projection
epsg = 4269 # http://spatialreference.org/ref/sr-org/lambert_conformal_conic_2sp/
srs = osr.SpatialReference()
srs.ImportFromEPSG(epsg)
dest_wkt = srs.ExportToWkt()
# Set projection
dst_ds.SetProjection(dest_wkt)
# Close files
dst_ds = None
src_ds = None
But, I can't quite figure out how to place a "red dot" at 35-13.643782N, 080-57.190157W
I'm having to learn some new details here (nomenclature about GIS).
With an ArcGIS Engine application, I am trying to figure out how to have the Selected Symbols scale with reference scale when selected using ArcObjects. They are currently not scaling correctly in ArcGIS Engine. Example, I select a stylized point that is using the "with this color" under layer properties (not the generic "with this symbol" option).
You can set this option in ArcMap via the "Select Options" dialog, and by checking "Scale selection symbols when a reference scale is set". Saving the map does not persist this setting when an MXD is opened in the ArcGIS Engine application. So in the example above, the stylized point will be colored, but it is only true to scale at the given reference scale when selected.
I have combed a lot of articles and found the various Selection interfaces (threshold tolerances, record counts, layer saving colors, etc.)
Where can I find this interface that controls the selection scaling (using ArcGIS Engine)?
I am about to go a graphics layer route, but I would prefer not to if the "easy" answer is out there.
I need to transform the example coordinates to a different projection in Openlayers3, the EPSG:32628 to EPSG:3857. I made a function to do it but the result is exactly the same numbers.
function plsHelp(){
var pt = [459123.1209, 3108334.7701];
var scr = new ol.proj.Projection('EPSG:32628');
var dest = new ol.proj.Projection('EPSG:3857');
var test= ol.proj.transform(pt,scr,dest);
console.log(test);
}
What is wrong with the function that is preventing the tranformation of the coordinates from EPSG:32628 to EPSG:3857 in Openlayers 3?
Answer
OpenLayers natively includes the two following projections only: EPSG:3857 and EPSG:4326. To be able to transform to or from any other projections, you must use the Proj4JS library.
Try adding the two following scripts, the first being the Proj4JS library itself, the other the definition of the EPSG:32628 projection:
I have a point table and the buffer geometry is created around the point.
I have defined the if the point is within the buffer_distance then its value is =1 and if it is outside the buffer its value is =0, and when it is on buffer_polygon then =2.
Now when ever i change the location of point then it should check the following conditions and the flag value should change according to the location of point new position.
I am changing the position of the point in QGIS.
My table structure is like this:-
GID(PK) Flag(INT) Buffer_Distance THE_Geom Buffer_GEOM
1 1 100 point(X,Y Location) Buffer Created around the Point
2 2 200 point(X,Y Location) Buffer Created around the Point
3 2 200 point(X,Y Location) Buffer Created around the Point
4 3 300 point(X,Y Location) Buffer Created around the Point
5 3 300 point(X,Y Location) Buffer Created around the Point
6 1 100 point(X,Y Location) Buffer Created around the Point
I have an already mosaiced image for a large area. I need to match colours in this single image. I do not have each image separately. I just have this large single image downloaded from GLS. How can I match the colour of this image if I do not have its image in parts? I did a Histogram match but it does not work. Please provide me steps for any of the following:
I've just downloaded and installed the new version of QGIS 2.10.1 with GRASS 6.4.4. When opening a new GRASS mapset and importing layers, I missed the button "Add a new vector layer". I've updated the GRASS plugin, but again the button wasn't there (all other GRASS symbols except "add raster layer" were visuable).
It's maybe a stupid question of a GIS beginner, but what can I Do? Is there an option to add (not import) a vector layer via the GRASS toolbox?
I have added vector layer to map:
vactorTest = new OpenLayers.Layer.Vector("Editable Features", {
strategies: [new OpenLayers.Strategy.BBOX(), saveStrategy],
projection: new OpenLayers.Projection("EPSG:900913"),
protocol: new OpenLayers.Protocol.WFS({
srsName: "EPSG:900913",
url: "http://localhost:8080/geoserver/wfs",
featureType: "ROADS",
featureNS: "http://localhost:8080/MIA",
featurePrefix: "MIA",
geometryName: "GEOM",
version: "1.1.0"
})
});
map.addLayer(vactorTest);
And then, added polygon draw control:
var drawPolygon = new OpenLayers.Control.DrawFeature(
vactorTest, OpenLayers.Handler.Polygon,
{
title: "Draw Polygon",
displayClass: "olControlDrawFeaturePolygon",
multi: true
}
);
with drawn polygon I want to filter layer:
testLayer.mergeNewParams({
"CQL_FILTER": mergeFilter
});
I use within filter:
WITHIN(GEOM, POLYGON((4693721.49445 672633.89194, 4560244.10812 322255.75282, 4703732.29843 422363.79257, 4693721.49445 672633.89194)))
target layer is in Georgia, and if I draw polygon near Italy then, filter works.
How can I change vector projection like my layer to get right result?
Answer
You can serialize your data. To reproject the data when converting, you should pass the internal and external projection to the format class, then use that format to write out your data.
var format = new OpenLayers.Format.GeoJSON({
'internalProjection': new OpenLayers.Projection("EPSG:900913"),
'externalProjection': new OpenLayers.Projection("EPSG:4326")
});
var jsonstring = format.write(vector_layer.features);
or you can transform your features on your vector layer as,
var proj = new OpenLayers.Projection("EPSG:4326");
var point = new OpenLayers.LonLat(-71, 42);
map.setCenter(point.transform(proj, map.getProjectionObject()));
I'm trying to generate a table that captures the number of rows, and the source feature class, from the intersection of several FCs against one common layer. My expected output is one row per intersection set containing the number of rows intersected and the source feature class for that intersection (technically there are two source feature classes for a given intersection set but the second FC is always the same). However my final table turns out empty and I don't understand what I'm doing wrong.
My model, as shown, iterates through FCs in a geodatabase and intersects them against a common layer for all FCs. I subsequently use Summary Statistics to get a count of rows, add a field to include the name of the FC selected from the geodatabase, and append this to a dummy table I've generated.
The process runs and creates a table with the right fields but the cells are empty.
I'm trying to add a layer manually to a vector layer with javascript. I can't seem to determine why this is failing:
http://jsfiddle.net/Kieveli/f4t6n6v1/4/
I've tried sane coordinates like 16,22, and big ones to match the view's xy values. I get a javascript error from ol3 : TypeError: b.Q is not a function.
HTML:
Javascript:
var vectorSource = new ol.source.Vector({});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.MapQuest({layer: 'sat'})
}),
new ol.layer.Vector({
source: vectorSource
})
],
target: 'map',
view: new ol.View({
center: [-11000000, 4600000],
zoom: 4
})
});
var thing = new ol.geom.Polygon( [ [16000000,22000000],[44000000,55000000],[88000000,90000000] ] );
vectorSource.addFeature( thing );
Answer
As Gabor Farkas said, I was adding the geometry and not a feature to the source. I was also missing [] on the coordinates to the geometry, and wasn't converting properly. Outside of here, I was using lat/long as x/y instead of y/x. Updated fiddle:
http://jsfiddle.net/Kieveli/f4t6n6v1/7/
HTML:
JAVASCRIPT:
var vectorSource = new ol.source.Vector({});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.MapQuest({layer: 'sat'})
}),
new ol.layer.Vector({
source: vectorSource
})
],
target: 'map',
view: new ol.View({
center: [-11000000, 4600000],
zoom: 4
})
});
var thing = new ol.geom.Polygon( [[
ol.proj.transform([-16,-22], 'EPSG:4326', 'EPSG:3857'),
ol.proj.transform([-44,-55], 'EPSG:4326', 'EPSG:3857'),
ol.proj.transform([-88,75], 'EPSG:4326', 'EPSG:3857')
]]);
var featurething = new ol.Feature({
name: "Thing",
geometry: thing
});
vectorSource.addFeature( featurething );
I'm using a Query Layer on SQL Server in ArcMap. The Query Layer executes instantly in in SQL Server but but takes so long to draw in ArcMap that the system appears unresponsive for about 10 minutes or longer. During the ArcMap draw the one of the CPU's is maxed out on the SQL Server process.
My Query is the STIntersects of a buffer on a line feature (Shannon) against a polygon feature class (Townlands) , as follows;
SELECT TOWNLANDS.TL_ID,TOWNLANDS.Shape FROM dbo.TOWNLANDS as townlands
with(index(FDO_Shape))
JOIN dbo.Shannon on townlands.Shape.STIntersects
(Shannon.Shape.STBuffer(2.0))=1
The query returns 186 rows instantly. These can be draw in the SQL Server Management Studio Spatial pane without a problem
When I build a Query Layer in ArcMap with exactly the same syntax the system becomes unresponsive but does draw eventually. It looks as though, perhaps, ArcMap s not using the spatial index or is doing so differenlt from SQL Server causing an inefficient query on SQL Server that takes an age to return.
Can anyone advise on a remedy?
Thanks
ArcGIS Desktop: 10.2
ArcSDE: 10.2
RDBMS: Database and version: SQL Server 2008
OS: Windows Server
Cross post from: https://geonet.esri.com/thread/125010
Does anyone know how to change the data source of a table using arcobjects? I know it can be done with arcpy, but I'm using C#. I've managed to change the source of all the layers in the mxd, but I need to do tables too.
I've come up with a solution by adding and removing from the table collection.
Is this the best way to do it?
IMap map = ...;
IWorkspace = ...;
ITableCollection tableCollection = (ITableCollection)map;
int tableCount = tableCollection.TableCount;
// iterate over a copy of the tables so we can add and remove
List tables = new List();
for (int i = 0; i < tableCount; i++)
{
tables.Add(tableCollection.get_Table(i));
}
foreach (ITable oldTable in tables)
{
IDataset dataset = (IDataset)oldTable;
IDatasetName datasetName = (IDatasetName)dataset.FullName;
string workspaceName = datasetName.WorkspaceName.PathName;
// get the new table
ITable newTable = ((IFeatureWorkspace)workspace).OpenTable(datasetName.Name);
// replace the table in the TOC
tableCollection.RemoveTable(oldTable);
tableCollection.AddTable(newTable);
// fire change event to change table
IMapAdmin2 mapAdmin2 = (IMapAdmin2)map;
mapAdmin2.FireChangeTable(oldTable, newTable);
}
Note: this is simplified - I did check the table was in the new workspace before opening it.
Answer
You should use the table property of IStandaloneTable to change its datasource. First create a reference to the new ITable (e.g. a table from a geodatabase), then use this code to replace the Table property:
IMap map = ...;
IStandaloneTableCollection tbcol= (IStandaloneTableCollection)map;
for (int i = 0; i < tbcol.StandaloneTableCount; i++)
{
var stTable = tbcol.get_StandaloneTable(i);
stTable.Table = newTable; //Here put the new ITable To change the datasource
if (!stTable.Valid)
MessageBox.Show("Table is not valid, "+stTable.Name);
}
I recently posted this query: Arcpy script stalls, CPU usage goes to 0, no error message returned and got as a suggestion to increase the cache size in Arcpy for the geocoding of addresses that I am performing.
The link here describes how to do this for the GUI version of ArcMap.
But, the support page for the GeocodeAddresses_geocoding doesn't mention how to manage the cache via Arcpy, nor can I find other references to it.
How can this be accomplished in Arcpy?
Are there any tutorials, talks or presentations that discuss the use of EC2 or other cloud computing services to host GIS Servers? Has anyone had any experience in doing it with Amazon's EC2? How hard is it to setup? I know that ESRI has some versions of their server products focused especifically to EC2, has anyone had success in using them?
Thank you very much.
Answer
Here is a page with answers to common questions:
Questions and Answers about ArcGIS Server on Amazon EC2
And here's a recorded training seminar:
Running ArcGIS Server on Amazon EC2
I was looking for an automated process to "identify" the toe of a slope from a DEM and ran across this ESRI thread and technique:
I am at Step 7 but have no idea how this is accomplished. I get it is in Raster Calculator but how???
Re: Finding toe-of-slope in a DEM
Author William Huber
Date Nov 29, 2003
Message There are a lot of approaches that might be effective. Here's one. Implement it using the Raster Calculator.
(1) Create an indicator grid of "flat" areas. In the example (attached), I have begun with a DEM of part of Highland County, VA. The "flat" areas are those with a slope of less than 6 percent.
(2) Creat an indicator grid of "steep" areas. This is the complement of the flat areas.
(3), (4) Use the indicator grids to mask the original DEM, creating grids showing elevations only where the slope is flat or steep.
(5), (6) Compute neighborhood means of the steep elevations and flat elevations.
(7)Create a "valley edges" grid at cells where the mean of the steep elevations exceeds the mean of the flat elevations.**
(8), (9) Simplify this valley edge grid by performing a Boundary Clean operation, then shrink it by a cell or two.
Any help would be appreciated. Or maybe there is a different way.
I'm reading into how to customise projections with Proj4 - specifically to achieve tilted projections such as the example below (from vis4.net)
The Proj4 literature is pretty heavy going and having explored it I'm not clear which parameters I'd need to change, or whether a custom datum would need to be defined.
Answer
Define a tilted perspective projection (tpers) using:
h: height (in meters) above the surfaceazi: bearing (in degrees) from due northtilt: angle (in degrees) away from nadirlat_0: latitude (in degrees) of the view positionlon_0: longitude (in degrees) of the view positionPutting it all together, here is an example PROJ string for part of Europe:
+proj=tpers +ellps=WGS84 +h=5000000 +azi=30 +tilt=40 +lat_0=20 +lon_0=0
How do you calculate the nearest distance from one XY coordinate to another XY.
I'm using Arc Map 10
I went into Arc tool box -> proximity -> then I only have 2 buffering options.
But under buffer I do not see any "near features" option
Answer
Based on your other question, you have a Basic license and so don't have access to the Near or Generate Near Table tools. But you can still do it with a Spatial Join. If your XY are just coordinates, you need to make point features out of them first. There are other questions here that cover that.
Spatial Join your points to themselves (if they're in the same layer) with a one-to-one join_operation and closest match_option. Specify a distance field name, and the output table of the join will include a column with the distance (in dataframe CRS units) from each point to its closest neighbor.
What technologies and skill sets should one who wants to do web GIS development study/acquire?
One skill/technology per answer please.
Answer
I can tell you about my experience, which started as a simple geographer, trying to use GIS products to do spatial analysis.
As I said, I'm a geographer, and from the beginning in college I started working with GIS as a user. After that, I started to research on how to automate tedious tasks I had to do often. That came as passion, and after 3 three years, I'm employed by a multinational software house, that works with many GIS systems and developing custom solutions.
My steps were:
Learn GIS well. Don't start out learning programming without having the fundamental right. Projections and transformations, spatial analysis, differences between the raster and vector model, etc.
Learn the database fundamentals: Introduction to Database Systems,Fundamentals of Database Systems. The two books are a bit different. The first is heavy on theory, the second one takes a more practical approach.
Learn SQL. This is actually a second part to the first. It will help you a great deal if you start to think in a "sqlish" manner. SQL changes from vendor to vendor. I can recommend you with PostgreSQL, which , is the vendor that follows the standard the most. If you need to learn specific dialects, do it later, when you actually need it.
Object Oriented Programming. It seems a challenge, but it's quite easy once you grasp the basics. Choose a easy language to do it. Python is by far the easiest one. Learning Python is an excellent starting point. There are open-source/free Python books, like Dive into Python. After Python, interesting choices are: .NET, Java, and C/C++.
Study programming. Read code, write code. Read geospatial code. Write geospatial code. Study the classic APIs: GEOS, JTS, GDAL, ArcObjects (if you are an ESRI fan - and it's a big plus in the market), etc.
- Take a geospatial problem and write code to solve it. I cannot stress how useful this is. This will make you crazy, but it's a very good way to confirm that you learned the programming side and to make sure your geo-spatial skills are up to date. In my case I wrote a small PostgreSQL application to geocode traffic accidents.
Keep on studying. OGC standards are a nice choice here.
I have got lots of different layers in the Table of Content panel in ArcMap. I want to export them all in shp format in one go. How can I do that? So far I have been doing it one by one by right clicking on the layer-->data-->export as shp. and it is taking longer time. I want to do them all together.
Here's what's happening:
I want to create a 3D line using only the height of some GSP points. I need to be able to extrapolate the vertice's height between where it's known to the one where it's unkonwn.
What I have tried:
Is this what I need?:
I think I should use something like "IZ.InterpolateZsBetween" but I am useless at coding. Could someone please explain me how to implement this fonction?
Many thanks
Answer
IZ.InterpolateZsBetween interpolates between vertices with Z value. Use it if your polyline has some Z values.
Otherwise you can use Extract Values to points or Interpolate Shape. These both require surface that you may get your values. Not sure if TIN would be ok, but always you can convert TIN To Raster.
Also you could construct polyline ZM and Calibrate Route M with your GPS points. It should do what IZ.InterpolateZsBetween, only for M. Than you could use M as Z. though as far as I remember year back there was a bug in this algorithm. Still worth a try.
In QGIS 2.8, the heatmap plugin got CRS broken. I updated to 2.10, now in the plugin the dialog is broken: it does not let you choose the format.
I render layers for atlases with heatmap style. But I need to export it to GeoTIFF, and I don't see a way to do this.
Updating the QGIS is not easy in Ubuntu, since it works normally when installed from a PPA, but installing from sources, or downloading debs is very painful.
Is there a workaround?
A command line example will do too.
edit here's a screenshot. The format list is empty, and if I write file extension manually as I did here, it still does not allow, showing a message that format is not chosen.
Meanwhile in another dialog, format choice works correctly:
Versions: 
You can set the default output-extension of a model in processing > options > general. The intermediate transactions in a model are processed in that default file format.
After installing QGIS, the default extension is set to 'shp'.
A well-known disadvantage of using shp is the restriction in attributenames (set to 10 characters).
When I set the default to eg. 'geojson' I can evade the naming-restriction. But I then get some other errors on processing geometries.
So I'm looking for an explanation of the advantages and disadvantages of the different output-extensions used in the graphical modeller.
Is it possible to translate .las files to .pcd with PDAL? If so, using which tool? I need an example about how to set the command-line with such tool.
If it is not possible (or alternatively), is there other open source software that can translate .las to .pcd?
Answer
The PDAL PCD Writer can write .pcd files. For it to work, you must have linked the PCL libraries at compile time. The PDAL OSGeo4W build does not have PCL support. If you are unable to build PDAL with PCL support yourself, one possibility is to use PDAL's Docker containers to achieve your task -- those have PCL linked.
Then, simply run pdal translate:
Using your own PDAL build with PCL linked:
pdal translate input.las output.pcd
With Docker:
docker run -v /c/Users/hobu/:/data pdal/pdal:1.5 ^
pdal translate /data/input.las /data/output.pcd
After installing an update for the OpenLayers-plugin today, this plugin does not work any longer. Reinstalling did not function neither with QGIS 2.12.0-Lyon nor with QGIS 2.14.1 ESSEN. Following error message occurred:
"Konnte Erweiterung openlayers_plugin nicht laden aufgrund eines Fehlers beim Aufruf der initGui() Methode
UnicodeEncodeError: 'ascii' codec can't encode character u'\xdc' in position 11: ordinal not in range(128)
Traceback (most recent call last):
File "C:/PROGRA~1/QGISLY~1/apps/qgis/./python\qgis\utils.py", line 315, in startPlugin
plugins[packageName].initGui()
File "C:/Users/Stalze/.qgis2/python/plugins\openlayers_plugin\openlayers_plugin.py", line 115, in initGui
print action.text()
UnicodeEncodeError: 'ascii' codec can't encode character u'\xdc' in position 11: ordinal not in range(128)
Python-Version: 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)]
QGIS-Version: 2.12.0-Lyon Lyon, cd9d645
Python-Pfad:
C:/Users/Stalze/.qgis2/python/plugins\processing
C:/PROGRA~1/QGISLY~1/apps/qgis/./python
C:/Users/Stalze/.qgis2/python
C:/Users/Stalze/.qgis2/python/plugins
C:/PROGRA~1/QGISLY~1/apps/qgis/./python/plugins
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\matplotlib-1.3.1-py2.7-win-amd64.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\nose-1.3.3-py2.7.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\tornado-4.0.1-py2.7-win-amd64.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\backports.ssl_match_hostname-3.4.0.2-py2.7.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\certifi-14.05.14-py2.7.egg
c:\osgeo4~1\apps\python27\lib\site-packages\python_dateutil-2.1-py2.7.egg
c:\osgeo4~1\apps\python27\lib\site-packages\six-1.3.0-py2.7.egg
C:\PROGRA~1\QGISLY~1\bin\python27.zip
C:\PROGRA~1\QGISLY~1\apps\Python27\DLLs
C:\PROGRA~1\QGISLY~1\apps\Python27\lib
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\plat-win
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\lib-tk
C:\PROGRA~1\QGISLY~1\bin
C:\PROGRA~1\QGISLY~1\apps\Python27
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\PIL
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\jinja2-2.7.2-py2.7.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\markupsafe-0.23-py2.7-win-amd64.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\pytz-2012j-py2.7.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\win32
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\win32\lib
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\Pythonwin
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\Shapely-1.2.18-py2.7-win-amd64.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\six-1.3.0-py2.7.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\wx-2.8-msw-unicode
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\xlrd-0.9.2-py2.7.egg
C:\PROGRA~1\QGISLY~1\apps\Python27\lib\site-packages\xlwt-0.7.5-py2.7.egg
C:/Users/Stalze/.qgis2//python
C:\Users\Stalze\.qgis2\python\plugins\DigitizingTools\tools
C:\Users\Stalze\.qgis2\python\plugins\mmqgis/forms
C:\Users\Stalze\.qgis2\python\plugins\SelectTools/tools
C:/Users/Stalze/.qgis2/python/plugins\shpsync\xlrd-0.9.4-py2.7.egg
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C:\PROGRA~1\QGISLY~1\apps\qgis\python\plugins\fTools\tools"
As I work with the Bing aerial layer quite often, what could I do to make this plugin run again?
I think I understood the steps to write an array to a raster file using python. however it doesn't work in my case and I don't know why. I have an array that I want to write to a Geotiff with Swiss Oblique Mercator Projection. I have a DEM as Geotiff in the exact same location with same projections and Geotransform, so I thought I just read all parameters from that DEM and use them to write my new raster. Here's the code that I'm, using:
driver.Register()
fn = '/media/LACIE_SHARE/davos2015.tif'
inDs = gdal.Open(fn)
if inDs is None:
print 'Could not open ' + fn
sys.exit(1)
rows=inDs.RasterYSize
cols=inDs.RasterXSize
driver=inDs.GetDriver()
outDs=driver.Create('/home/grassdata/test.tif',cols,rows,1,gdal.GDT_Float32)
if outDs is None:
print "crap"
sys.exit(1)
outBand=outDs.GetRasterBand(1)
outData=coh0 #coh0 is the array I want to convert to raster. it's an array with float32 entries.
outBand.WriteArray(outData) # this gives 0
outBand.FlushCache()
outBand.SetNoDataValue(-99) #this gives 0
outDs.SetGeoTransform(inDs.GetGeoTransform()) #this gives 0
outDs.SetProjection(inDs.GetProjection()) #this gives 0
del outData
the lines where I commented accordingly raise 0 as result and I don't understand why.
Answer
Your issue is rooted in a well known GDAL Python gotcha - a dataset needs to be closed for it to be written to disk.
In Python this happens when the object goes out of scope and is garbage collected or when you manually dereference it. This is usually done by setting it to None or deleting it.
In your particular code the error is in the last line: del outData only closes your coherence numpy array. You want to close outDs so it is written to disk. FlushCache() is not necesary in your case since that only influences the behaviour of the blockcache which GDAL handles internally.
Your last lines should look like this:
outBand.WriteArray(coh0)
outBand.SetNoDataValue(-99)
outDs.SetGeoTransform(inDs.GetGeoTransform())
outDs.SetProjection(inDs.GetProjection())
outBand = None
outDs = None
Additional notes:
CreateCopy() method to save some lines of code.I'm using ArcMap 10.3, and I have several lines, that I would like to add arrows along at a defined interval, with that lines rotation, so the arrows point correct way along the line.
When I use the construct point (while having a line marked) I can get points at a defined interval for one line at a time, but it does not rotate according to the line direction. The funny thing is, it pretty much shows a preview, when you use this tool, with exactly the type of points I want (maybe a different arrow type), question is, how do I get it as shown on the picture below?
So to sum up, I would like to add points (in the shape of arrows) along a line, with the arrows pointing in the line direction.
Tried what is suggested at: Unable to rotate Marker Line Symbols
However this gives the difference, that smaller lines will have perhaps 5 markers on a line of 100 meters, but a line of 10000 meters will also have 5, so the interval is not ~ close to each other.
Answer
The line shown below drawn using @Richard Fairhurst solution for my question
Alternatively use workflow below, to assign correct bearing to your points, called “chainage”.
arcpy.AddField_management("chainage","IDFIELD","LONG")
arcpy.CalculateField_management("chainage", "IDFIELD", "[FID]")
arcpy.Buffer_analysis("chainage", "D:/Scratch/buffers.shp","5 Meters")
arcpy.Intersect_analysis("LINE #;buffers #", "D:/Scratch/directions.shp", "ALL")
Note that my line(s) layer called LINE. At this stage you can use “directions” with arrow-right symbol:
If you insist on points, calculate “directions” bearing:
arcpy.AddGeometryAttributes_management("directions", Geometry_Properties="LINE_BEARING")
Transfer bearing to chainage points using common “IDFIELD” and apply rotation to point symbol:
Solution assumes you know how to place points at regular interval.
You might experiment with distance between points and buffer size and smoothed version of your line. In above example I placed points at 100m interval and used 5m buffer.
I want try use Python and GDAL to create some SQL queries in my shapefiles. I try something and it looks good, but doesn't work. I get a none result.
Here is the code :
from osgeo import ogr
ogr_ds = ogr.Open('line.shp')
TEST=3
sql = "SELECT id FROM {} where id='{}'".format(ogr_ds,TEST)
layer = ogr_ds.ExecuteSQL(sql)
print layer
Answer
You are probably using the input layer in a wrong way; furthermore, also the .format{} operation doesn't seem correct.
You may try the following code:
from osgeo import ogr
filepath = 'C:/Users/path_to_the_shapefile/line.shp' # set the filepath
layer_name = filepath[:-4].split('/')[-1] # get the layer name
driver = ogr.GetDriverByName ("ESRI Shapefile")
ogr_ds = driver.Open(filepath)
TEST=3
sql = "SELECT id FROM %s WHERE id=%s" %(layer_name,TEST)
layer = ogr_ds.ExecuteSQL(sql)
print layer
I tested it with another shapefile (and a similar query) and it returns what expected:
print layer
>
EDIT
If you want to print the id value, you may add these lines:
feat = layer.GetNextFeature()
val = feat.GetField(0)
print val
but this will only returns one feature and not all the queried features (this kind of operation would be useful if you are only interested in knowing if a specific value for the id field is stored in the input layer). Furthermore, you will get an error if there isn't any id value equals to the TEST variable.
I am using QGIS to create Voronoi / Thiessen polygons for 4 rain gauges.
I am having issues with both the QGIS 'Voronoi polygons' tool and the Grass equivalent 'v.voronoi' where one of my 4 points is skipped and only 3 polygons are generated in the output.
As a test I have added an additional point and have found that both tools output a polygon with the correct number of parts (5). Is there a reason it will not work correctly on 4 or less points?
Edit - image showing the configuration of points and the output Voronoi polygons skipping the central point
I am attempting to recreate a layout from ArcGIS in QGIS. One of the advanced label options in ArcGIS is to force horizontal labels outside a polygon. You can optionally choose which quadrant the labels fall in.
This question is related, but the labels are parallel with the polygon perimeter: Labels outside polygons in ArcMap
The answer to this question is basically what I'm looking for, but my polygons aren't circles: Upright/Horizontal labels when labeling polygons at perimeter in QGIS That question was asked in 2014, so perhaps a solution has been found in ensuing years? I am fine with prioritizing a quadrant for location, if that would help.
I am looking for QGIS function to extract (or detect) edge from a raster, which was referred in here, How to digitize a raster automatically as answer by @MappaGnosis.
The name could have changed since then, or it may have been integrated into other tool... I cannot find it in my QGIS Processing Toolbox (2.14.10 and 2.18.2).
There are similar tools such as GRASS "i.zc Zero-crossing" and SAGA "Gaussian filter", but I am hoping to find this QGIS geoalgorithm.
Answer
The Edge Extraction tool may have been moved to the Orfeo Toolbox as this focuses on image analysis. The Orfeo Toolbox contains a number of edge extraction tools using various methods such as:
The attached screenshot shows a LiDAR point cloud with significant overlapping scans. This point cloud tile is part of the MN statewide LiDAR dataset which has 25% scan overlap and 1.5 NPS. For many applications, these overlaps pose no problem. However, when calculating LiDAR metrics such as forestry grid metrics, these overlapping scan can pose a major problem by creating biases in the resulting products.
There are several commercial applications that can deal with these overlapping scans such as Esri's Classify LAS Overlap and Lastools lasoverage. Is there an open source approach to detect, classify, and remove overlapping points from multiple flight lines?
Answer
There are a couple of options. Depending on the area of MN where you're processing, the overlap areas of the data are classified, and you can use a PDAL filters.range to cull them out:
pdal translate input.las output.las range --filters.range.limits="!Classification[12:12]"
(inspect and visualize that in your browser here)
Not everywhere has these nicely classified, however, and PDAL's filters.sample would be one way to create a point cloud of consistent density.
pdal translate input.las output.las sample --filters.sample.radius=1.414
PDAL works on Windows, OSX, and Linux/Docker. You can find out how to install PDAL from this SO post or on the PDAL website.
I am trying to iterate a series of feature classes (polygons) in model builder to convert a series of polygons to rasters, however, I am having an issue with the output file names.
After inserting the "iterate feature class" tool into the model builder window, and linking my gdb storing all the polygons as the input, the output feature (green bubble) automatically becomes the name of my first polygon. As a result the model that I attempt to run seems to recur to that named polygon rather than then going to the next polygon in the list. Output rasters are created, but overwrite that file name rather than generating a new raster with a new name that matches the subsequent polygons.
What am I doing wrong?
Answer
Here is the model, it uses inline substitution as described by Aaron. Note the output of the Polygon to raster tool is ..\fGBD_Scratch.gdb\ras_%Value%. Value is coming from the iterator which in this case was set to FID to hand out unique rows. So the first raster dataset would be ras_1, then ras_2, etc.
Can someone help with an explanation and some references, in order to understand the nature of return pulses within a LiDAR system.
I'm trying to programmatically populate a shp field with polygon areas:
import sys
import ogr
ds = ogr.Open( 'tttttttttt.shp', update = 1 )
if ds is None:
print "Open failed./n"
sys.exit( 1 )
lyr = ds.GetLayerByName( "tttttttttt" )
lyr.ResetReading()
field_defn = ogr.FieldDefn( "Area", ogr.OFTReal )
lyr.CreateField(field_defn)
for i in lyr:
# feat = lyr.GetFeature(i)
geom = i.GetGeometryRef()
area = geom.GetArea()
print 'Area =', area
lyr.SetFeature(i)
i.SetField( "Area", area )
ds = None
But I get an empty values in the field...
Answer
You have to use lyr.SetFeature(i) to trigger the update in your shape file. You'll have to close the data sources in the end so things get written.
import sys
import ogr
ds = ogr.Open( 'tttttttttt.shp', update = 1 )
if ds is None:
print "Open failed./n"
sys.exit( 1 )
lyr = ds.GetLayerByName( "tttttttttt" )
lyr.ResetReading()
field_defn = ogr.FieldDefn( "Area", ogr.OFTReal )
lyr.CreateField(field_defn)
for i in lyr:
# feat = lyr.GetFeature(i)
geom = i.GetGeometryRef()
area = geom.GetArea()
print 'Area =', area
lyr.SetFeature(i)
i.SetField( "Area", area )
lyr.SetFeature(i)
ds = None
*Low-rep comment and concern: If the 'Area' field already exists, this code creates an extra field, like "Area_n", and overwrites the existing Area field. Maybe folks should add some safety code like:
ldef = lyr.GetLayerDefn()
if ldef.GetFieldIndex("Area") != -1:
print "'Area' field already defined"
... # exit or overwrite logic
How can I explicitly close/release the result of an ExecuteSQL statement when querying a Spatialite database with OGR via Python? I have a simple query to return the SRID of a dataset. This works as expected. However, subsequent calls to ds.ExecuteSQL fail with the error 'SQL logic error or missing database' unless I iterate all the way through the result rows.
For example:
ogr.UseExceptions()
# This query returns a single row
sql = 'select distinct srid(geometry) from foo'
result = ds.ExecuteSQL(sql)
row = result.next()
epsg = row.GetField(0)
# This call fails
ds.ExecuteSQL('drop table bar')
Completing the iteration avoids the error:
_ = [r for r in result]
This is fine for simple cases, but not very explicit. I've tried calling result.Dereference(), row=None; result=None but these do not help. What is it that I'm missing here?
UPDATE The exception is only raised when I enable ogr.UseExceptions(). Otherwise the error passes silently and the drop table statement has no affect.
After major upgrade to 14.04 I tried to purge and reinstall QGIS.
Unfortunately I get and error (full listing below) and cannot finish clean installation.
Information in the log points errors to appear with pyspatialite and/or python-pyspatialite but I cannot find any solution to this issue.
Also - QGIS actually manages to start after installation but points to another error with PyQGIS this time:
Any ideas how to solve this issue?
rdk@hal:~$ sudo apt-get install qgis python-qgis qgis-plugin-grass
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
grass grass-core grass-doc grass-gui libmotif-common libmrm4
libopenscenegraph99 libosgearth3 libosgearthannotation3 libosgearthfeatures3
libosgearthqt3 libosgearthsymbology3 libosgearthutil3 libqgis-analysis2.2.0
libqgis-core2.2.0 libqgis-gui2.2.0 libqgis-networkanalysis2.2.0
libqgisgrass2.2.0 libqgispython2.2.0 libspatialindex3 libtcl8.5 libtk8.5
libuil4 libxm4 osgearth-data python-opengl python-pyspatialite
python-qgis-common qgis-common qgis-plugin-globe qgis-plugin-globe-common
qgis-plugin-grass-common qgis-providers qgis-providers-common tcl8.5 tk8.5
Suggested packages:
grass-dev e00compr avce00 gnuplot gpstrans python-rpy2 xml2 grass-dev-doc
openscenegraph libgle3 tcl-tclreadline
The following NEW packages will be installed
grass grass-core grass-doc grass-gui libmotif-common libmrm4
libopenscenegraph99 libosgearth3 libosgearthannotation3 libosgearthfeatures3
libosgearthqt3 libosgearthsymbology3 libosgearthutil3 libqgis-analysis2.2.0
libqgis-core2.2.0 libqgis-gui2.2.0 libqgis-networkanalysis2.2.0
libqgisgrass2.2.0 libqgispython2.2.0 libspatialindex3 libtcl8.5 libtk8.5
libuil4 libxm4 osgearth-data python-opengl python-pyspatialite python-qgis
python-qgis-common qgis qgis-common qgis-plugin-globe
qgis-plugin-globe-common qgis-plugin-grass qgis-plugin-grass-common
qgis-providers qgis-providers-common tcl8.5 tk8.5
0 to upgrade, 39 to newly install, 0 to remove and 0 not to upgrade.
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Answer
Until Ubuntugis supports all required packages (especially GDAL and spatialite), it is recommended to use the official QGIS repository:
https://www.qgis.org/en/site/forusers/alldownloads.html#ubuntu
It works for me, except for the exotic drivers that require special gdal packages. These will be available from ubuntugis again once they are finished.
I am trying to plot a polygone on python, using different libararies, but no one of these worked with me. I tried vincent ,Shapely , .. and now matplotlib. I don't wanna use softwares like qgis
I used this example: http://geographika.co.uk/visualising-geojson-in-15-minutes
from matplotlib import pyplot
from descartes import PolygonPatch
import math
import urllib2
import simplejson
data = []
with open('file.json') as f:
for line in f:
data.append(json.loads(line))
def plotFeature(coordlist, myplot):
#create a polygon geojson-like feature
poly = {"type": "Polygon", "coordinates": coordlist}
patch = PolygonPatch(poly, fc='#6699cc', ec='#6699cc', alpha=0.5, zorder=2)
#plot it on the graph
myplot.add_patch(patch)
for coordlist in data['features'][0]['geometry']['coordinates']:
plotFeature(coordlist, myplot)
fig = pyplot.figure(1, figsize=(10, 4), dpi=180)
ax = fig.add_subplot(121)
ax.savefig('myplot.png')
External file "file.json"
var states = [{
"type": "Feature",
"properties": {"party": "Republican"},
"geometry":
{
"type": "Polygon",
"coordinates": [
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[
-75.8660888671875,
35.53669637839501
],
[
-75.772705078125,
35.567980458012094
],
[
-75.706787109375,
35.634976650677295
],
[
-75.706787109375,
35.74205383068037
],
[
-75.69030761718749,
35.74205383068037
]
]
]
} } ]
But it doesn't seem to work out. I need to plot these coordinates with a map on background. Any example, library, tutorial to recommend ?
