Reading GeoTIFF with geotools

I have a geotiff file and I use geotools library for parsing it.

This is my code:

File f = new File("myFile.tif");

ParameterValue policy = AbstractGridFormat.OVERVIEW_POLICY.createValue();

policy.setValue(OverviewPolicy.IGNORE);

ParameterValue gridsize = AbstractGridFormat.SUGGESTED_TILE_SIZE.createValue();
ParameterValue useJaiRead = AbstractGridFormat.USE_JAI_IMAGEREAD.createValue();
useJaiRead.setValue(true);

GridCoverage2D image = new GeoTiffReader(f).read(new GeneralParameterValue[]{policy, gridsize, useJaiRead});

Rectangle2D bounds2D = image.getEnvelope2D().getBounds2D();     
GridGeometry2D geometry = image.getGridGeometry();


System.out.println(geometry);

System.out.println(bounds2D);

The output of geometry is:

GridGeometry2D[
    GeneralGridEnvelope[0..1199, 0..1399], 
    PARAM_MT[
        "Affine", 

        PARAMETER["num_row", 3], 
        PARAMETER["num_col", 3], 
        PARAMETER["elt_0_0", 996.4799194335938], 
        PARAMETER["elt_0_2", -598386.1975402832], 
        PARAMETER["elt_1_1", -999.6777954101562], 
        PARAMETER["elt_1_2", 650290.4111022949]
    ]
]

The output of bounds2D is:

java.awt.geom.Rectangle2D$Double[x=-598884.4375, y=-748758.6635742188, w=1195775.9033203125, h=1399548.9135742188]

What does this information mean?