I have a geotiff with one band of byte with a color table, but it does
not have NODATA set in it. How would I set it NODATA to be to be entry 0
in the color table.
$ gdalinfo A2015173174000.L0_LAC.L2_OC.tif
Driver: GTiff/GeoTIFF
Files: A2015173174000.L0_LAC.L2_OC.tif
Size is 2433, 1727
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 = (-84.000000000000000,45.000000000000000)
Pixel Size = (0.012741471640766,-0.012738853693008)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( -84.0000000, 45.0000000) ( 84d 0' 0.00"W, 45d 0' 0.00"N)
Lower Left ( -84.0000000, 22.9999997) ( 84d 0' 0.00"W, 23d 0' 0.00"N)
Upper Right ( -52.9999995, 45.0000000) ( 53d 0' 0.00"W, 45d 0' 0.00"N)
Lower Right ( -52.9999995, 22.9999997) ( 53d 0' 0.00"W, 23d 0' 0.00"N)
Center ( -68.4999997, 33.9999998) ( 68d30' 0.00"W, 34d 0' 0.00"N)
Band 1 Block=2433x3 Type=Byte, ColorInterp=Palette
Color Table (RGB with 256 entries)
0: 147,0,108,255
...
255: 0,0,0,255
I tried the following:
$ gdal_translate -a_nodata 0 -co TILED=YES A2015173174000.L0_LAC.tif
test-tc.tif
Input file size is 2433, 1727
0...10...20...30...40...50...60...70...80...90...100 - done.
[] ~/work/oceandata/test$ gdalinfo test-tc.tif
Driver: GTiff/GeoTIFF
Files: test-tc.tif
Size is 2433, 1727
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 = (-84.000000000000000,45.000000000000000)
Pixel Size = (0.012741471640766,-0.012738853693008)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( -84.0000000, 45.0000000) ( 84d 0' 0.00"W, 45d 0' 0.00"N)
Lower Left ( -84.0000000, 22.9999997) ( 84d 0' 0.00"W, 23d 0' 0.00"N)
Upper Right ( -52.9999995, 45.0000000) ( 53d 0' 0.00"W, 45d 0' 0.00"N)
Lower Right ( -52.9999995, 22.9999997) ( 53d 0' 0.00"W, 23d 0' 0.00"N)
Center ( -68.4999997, 33.9999998) ( 68d30' 0.00"W, 34d 0' 0.00"N)
Band 1 Block=256x256 Type=Byte, ColorInterp=Red
NoData Value=0
Band 2 Block=256x256 Type=Byte, ColorInterp=Green
NoData Value=0
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
NoData Value=0
But that does not look correct, so I'm checking. Also I don't see any
note that the tif is TILED?
Thanks,
-Steve
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