Chris,
When I examine an image GeoTiff with GDALinfo, here's what is output:
Driver: GTiff/GeoTIFF
Files: N33W118_D004_S001_T001_L00_U0_R0a.tif
Size is 1024, 1024
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
Origin = (-118.000000000000000,34.000000000000000)
Pixel Size = (0.000976562500000,-0.000976562500000)
Metadata:
AREA_OR_POINT=Area
TIFFTAG_SOFTWARE=GeoJasPer <www.dimin.net>
Image Structure Metadata:
COMPRESSION=JPEG
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left (-118.0000000, 34.0000000) (118d 0' 0.00"W, 34d 0' 0.00"N)
Lower Left (-118.0000000, 33.0000000) (118d 0' 0.00"W, 33d 0' 0.00"N)
Upper Right (-117.0000000, 34.0000000) (117d 0' 0.00"W, 34d 0' 0.00"N)
Lower Right (-117.0000000, 33.0000000) (117d 0' 0.00"W, 33d 0' 0.00"N)
Center (-117.5000000, 33.5000000) (117d30' 0.00"W, 33d30' 0.00"N)
Band 1 Block=256x256 Type=Byte, ColorInterp=Red
Band 2 Block=256x256 Type=Byte, ColorInterp=Green
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
This is one of the GeoTiff elevation files:
Driver: GTiff/GeoTIFF
Files: N33W118_D001_S001_T001_L00_U0_R0.tif
Size is 1024, 1024
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
Origin = (-118.000488281250000,33.999511718750000)
Pixel Size = (0.000976562500000,-0.000976562500000)
Metadata:
AREA_OR_POINT=Point
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-118.0004883, 33.9995117) (118d 0' 1.76"W, 33d59'58.24"N)
Lower Left (-118.0004883, 32.9995117) (118d 0' 1.76"W, 32d59'58.24"N)
Upper Right (-117.0004883, 33.9995117) (117d 0' 1.76"W, 33d59'58.24"N)
Lower Right (-117.0004883, 32.9995117) (117d 0' 1.76"W, 32d59'58.24"N)
Center (-117.5004883, 33.4995117) (117d30' 1.76"W, 33d29'58.24"N)
Band 1 Block=1024x1 Type=Float32, ColorInterp=Gray
I don't see the measurement value type, but I'm fairly sure they are both in
meters. (I also confirmed the above data in QGIS.)
I'll also look into gdalbuildvrt - Thanks!
Steven
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=75920#75920
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