Am 07.06.2015 um 18:50 schrieb Doug McCorkle:
Hello,
I am trying to add this projection to our runtime environment:
PROJCS["USA_Contiguous_Albers_Equal_Area_Conic_USGS_version",
GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983",
SPHEROID["GRS_1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433],
AUTHORITY["EPSG","4269"]], PROJECTION["Albers_Conic_Equal_Area"],
PARAMETER["False_Easting",0.0], PARAMETER["False_Northing",0.0],
PARAMETER["Central_Meridian",-96.0],
PARAMETER["Standard_Parallel_1",29.5],
PARAMETER["Standard_Parallel_2",45.5],
PARAMETER["Latitude_Of_Origin",23.0], UNIT["Meter",1.0],
AUTHORITY["EPSG","102039”]]
When I try to validate the projection I get this in the debug
output:
OGRSpatialReference::Validate: PARAMETER Central_Meridian for
PROJECTION Albers_Conic_Equal_Area is an alias for
longitude_of_center.
I am unsure of what to do with this debug information to correct the
definition. This is the proj4 definition:
# USA Contiguous Albers Equal Area Conic USGS version <102039>
+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23.0 +lon_0=-96 +x_0=0
+y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs <>
If you run gdalsrsinfo on this proj.4 string, you get the following WKT
output:
PROJCS["unnamed",
GEOGCS["NAD83",
DATUM["North_American_Datum_1983",
SPHEROID["GRS 1980",6378137,298.257222101,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,
AUTHORITY["EPSG","9108"]],
AUTHORITY["EPSG","4269"]],
PROJECTION["Albers_Conic_Equal_Area"],
PARAMETER["standard_parallel_1",29.5],
PARAMETER["standard_parallel_2",45.5],
PARAMETER["latitude_of_center",23],
PARAMETER["longitude_of_center",-96],
PARAMETER["false_easting",0],
PARAMETER["false_northing",0],
UNIT["Meter",1]]
So it is really a matter of naming the same parameter. Using
longitude_of_center will make all GDAL-dependent software happy, while
the Central_Meridian might be invoked by ESRI.
See also
http://www.remotesensing.org/geotiff/proj_list/albers_equal_area_conic.html
for the official OGC WKT parameter names.
HTH,
André Joost
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