Am 07.06.2017 um 02:35 schrieb Mike K:
Hello,
I have a situation in which I would like to load up a set of polygons, and
determine what EPSG code they are using. I am testing with a simple square
polygon in upstate New York using the UTM projection, saved into a Shapefile
.
I am able to create my dataset, layer, and read the geometry just fine. I
can get access to the spatial reference, but if I call the
OGRSpatialReference::GetEPSGGeogCS() function, it always returns code 4326 (
which is lat/lon ). This is not correct, but if I query other values, they
seem to be valid. For instance, OGRSpatialReference::GetUTMZone() will
return 17 N, which is correct.
Does anybody know why I might be getting the wrong EPSG code? I had thought
I might just have bad data, but the fact that I can get the values
individually makes me think it is something about how I am using the
functions. Thank you for any advice.
What EPSG code do you think is "right" ?
Many projected coordinate systems are based on a geographical coordinate
system more or less identical to WGS84 (EPSG:4326).
HTH,
André Joost
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