Hello all,
I am working on a land cover change analysis; I recently created a canopy cover raster with the following projection info:
NAD_1927_UTM_Zone_11N
WKID: 26711 Authority: EPSG
Projection: Transverse_Mercator
False_Easting: 500000.0
False_Northing: 0.0
Central_Meridian: -117.0
Scale_Factor: 0.9996
Latitude_Of_Origin: 0.0
Linear Unit: Meter (1.0)
Geographic Coordinate System: GCS_North_American_1927
Angular Unit: Degree (0.0174532925199433)
Prime Meridian: Greenwich (0.0)
Datum: D_North_American_1927
Spheroid: Clarke_1866
Semimajor Axis: 6378206.4
Semiminor Axis: 6356583.799998981
Inverse Flattening: 294.9786982
I received LIDAR-derived DSM's and DTM's for the same area but from a later year with the following projection info:
WGS_84_UTM_zone_11N
Authority: Custom
Projection: Transverse_Mercator
false_easting: 500000.0
false_northing: 0.0
central_meridian: -117.0
scale_factor: 0.9996
latitude_of_origin: 0.0
Linear Unit: Meter (1.0)
Geographic Coordinate System: GCS_WGS_1984
Angular Unit: Degree (0.0174532925199433)
Prime Meridian: Greenwich (0.0)
Datum: D_WGS_1984
Spheroid: WGS_1984
Semimajor Axis: 6378137.0
Semiminor Axis: 6356752.314245179
Inverse Flattening: 298.257223563
When I imported the new DTM's and DSM's, the layers were slightly off (by about 80 meters or so). I edited the spatial reference information in ArcCatalog and the layers still did not match up. I used the Project Raster tool and the layers still did not match up. I used the Define Projection tool and the layers still did not match up.
Any ideas on why these two datasets are not matching up? What should I do?
Thanks!
David
