We use GDAL/OGR/Proj4 in our application: MapWindow GIS.
We're testing the MapWinGIS.GeoProjection class. It's just a wrapper around
OGRSpatialReference class, so it's GDAL behavior infact.
The test code:
private void button8_Click(object sender, EventArgs e)
{
MapWinGIS.GeoProjection proj = new GeoProjection();
proj.ImportFromEPSG(4326);
System.Diagnostics.Debug.Print(proj.ExportToWKT());
string s = proj.ExportToProj4();
proj.ImportFromProj4(s);
System.Diagnostics.Debug.Print(proj.ExportToWKT());
s = proj.ExportToProj4();
proj.ImportFromProj4(s);
System.Diagnostics.Debug.Print(proj.ExportToWKT());
}
Results:
GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS
84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]]
GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS
84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"]]
GEOGCS["WGS
84",DATUM["unknown",SPHEROID["WGS84",6378137,298.257223563],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]]
If we test the first and the third string with GeoProjection.IsSame() it
will return false, but they are the same.
How should we bypass this?
All suggestions are welcome.
Thanks,
Paul
*Paul Meems *
Release manager, configuration manager
and forum moderator of MapWindow GIS.
www.mapwindow.org
Owner of MapWindow.nl - Support for
Dutch speaking users.
www.mapwindow.nl
*
*
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