On a follow-up to my previous email, here's some info (via gdalinfo) on one of my tiles that might be helpful in diagnosing the problem.
------------------------------------------------------------------------ Driver: GTiff/GeoTIFF Files: w111.99_n41.10.tif Size is 9781, 8011 Coordinate System is: PROJCS["NAD83 / UTM zone 12N", 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",-111], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","26912"]] Origin = (416757.000000000000000,4552963.200000000200000) Pixel Size = (0.300000000000000,-0.300000000000000) Metadata: AREA_OR_POINT=Area TIFFTAG_SOFTWARE=IMAGINE TIFF Support Copyright 1991 - 1999 by ERDAS, Inc. All Rights Reserved @(#)$RCSfile: etif.c $ $Revision: 1.11 $ $Date$ TIFFTAG_XRESOLUTION=1 TIFFTAG_YRESOLUTION=1 TIFFTAG_RESOLUTIONUNIT=1 (unitless) Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( 416757.000, 4552963.200) (111d59'29.91"W, 41d 7'25.33"N) Lower Left ( 416757.000, 4550559.900) (111d59'28.74"W, 41d 6'7.41"N) Upper Right ( 419691.300, 4552963.200) (111d57'24.09"W, 41d 7'26.39"N) Lower Right ( 419691.300, 4550559.900) (111d57'22.96"W, 41d 6'8.47"N) Center ( 418224.150, 4551761.550) (111d58'26.42"W, 41d 6'46.90"N) Band 1 Block=9781x1 Type=Byte, ColorInterp=Red Band 2 Block=9781x1 Type=Byte, ColorInterp=Green Band 3 Block=9781x1 Type=Byte, ColorInterp=Blue ----------------------------------------------------------------------- -Shayne
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