Monday, 10 December 2018

arcgis desktop - Older British Geological Survey geology maps of Kenya; need complete projection information


I have several geologic maps of Kenya produced by the BGS circa 1993. Noted on each map is the following:


Projection:-Transverse Mercator
Spheriod:-Clarke 1880 (modified)

That's great, but that doesn't tell me exactly which projection to use in ArcGIS. I've tried these two:


Adindan_UTM_Zone_37N and
Arc_1960_UTM_Zone_37N


Both put the maps in sort of the right place. There's a shift of about 50m to the west and 300m to the north. More or less.


Does anyone have a clue as to what the full projection parameters might be for these maps?




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