Definitely, thanks for the help. I am sort of new to this stuff. Below is the imagery from the small images I'm testing with.
Here is the info for the reprojected image (EPSG26910 -> EPSG26911) Driver: GTiff/GeoTIFF Files: 26910_rs.tif Size is 4577, 11883 Coordinate System is: PROJCS["NAD83 / UTM zone 11N", GEOGCS["NAD83", DATUM["North_American_Datum_1983", SPHEROID["GRS 1980",6378137,298.2572221010002, AUTHORITY["EPSG","7019"]], TOWGS84[0,0,0,0,0,0,0], AUTHORITY["EPSG","6269"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4269"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",-117], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","26911"]] Origin = (-177789.631458136136644,4942643.042761978693306) Pixel Size = (100.253523439120713,-100.236459348383733) Metadata: AREA_OR_POINT=Area Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( -177789.631, 4942643.043) (125d29'56.62"W, 44d19'11.15"N) Lower Left ( -177789.631, 3751533.196) (124d18'18.68"W, 33d41'14.38"N) Upper Right ( 281070.745, 4942643.043) (119d45'31.64"W, 44d36'13.72"N) Lower Right ( 281070.745, 3751533.196) (119d22' 1.78"W, 33d52'53.21"N) Center ( 51640.557, 4347088.120) (122d11'16.55"W, 39d 9'26.88"N) Band 1 Block=4577x1 Type=Byte, ColorInterp=Red Band 2 Block=4577x1 Type=Byte, ColorInterp=Green Band 3 Block=4577x1 Type=Byte, ColorInterp=Blue Here is the info for the native EPSG26911 image. PROJCS["NAD83 / UTM zone 11N", GEOGCS["NAD83", DATUM["North_American_Datum_1983", SPHEROID["GRS 1980",6378137,298.2572221010002, AUTHORITY["EPSG","7019"]], AUTHORITY["EPSG","6269"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4269"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",-117], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","26911"]] Origin = (222400.000000000000000,4654450.000000000000000) Pixel Size = (100.012896094325725,-100.000000000000000) Metadata: AREA_OR_POINT=Area Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( 222400.000, 4654450.000) (120d21' 4.97"W, 41d59'35.32"N) Lower Left ( 222400.000, 3595550.000) (119d57'11.96"W, 32d27'45.18"N) Upper Right ( 765270.000, 4654450.000) (113d47'50.08"W, 41d59'50.61"N) Lower Right ( 765270.000, 3595550.000) (114d10'39.77"W, 32d27'56.01"N) Center ( 493835.000, 4125000.000) (117d 4'10.33"W, 37d16'17.60"N) Band 1 Block=5428x1 Type=Byte, ColorInterp=Red Band 2 Block=5428x1 Type=Byte, ColorInterp=Green Band 3 Block=5428x1 Type=Byte, ColorInterp=Blue -- View this message in context: http://osgeo-org.1560.n6.nabble.com/gdal-merge-py-on-large-Tiff-s-gdalwarp-not-working-properly-tp4986729p4986770.html Sent from the GDAL - Dev mailing list archive at Nabble.com. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev