Hi All,
First off, sorry this is really long with all the gdalinfo pasted into
it, but I thought is might be more useful to have real information to
look at.
I have been running down a problem caused by upgrading a server to a
newer version of gdal. Here are the details:
old server: GDAL 1.6.0dev, FWTools 2.0.6, released 2008/02/03
new server: GDAL 1.9.2, released 2012/10/08
My process is:
wget
'http://cyclops.marine.usf.edu/modis/level3/husf/fullpass/2014/061/1km/pass/final/MODIS.2014061.194420.fullpass.rgb.hdf'
old server:
gdal_translate -of GTiff -ot Int16 -a_srs EPSG:32662 -a_ullr
-13914936.3491592 6094982.02936303 -5009377.08569731 -560262.454244465
HDF4_SDS:UNKNOWN:MODIS.2014061.194420.fullpass.rgb.hdf:0 temp.tif
new server:
gdal_translate -of GTiff -ot Int16 -a_srs EPSG:32662 -a_ullr
-13914936.3491592 6115512.02936303 -5009377.08569731 -539731.454244465
HDF4_SDS:UNKNOWN:MODIS.2014061.194420.fullpass.rgb.hdf:0 temp.tif
I have verified that gdalinfo -mm -stats temp.tif looks equivalent for
the two generated temp.tif images. The -a_ullr are different because
proj4 is shifting the image 20530m south so I'm correcting here for that.
summary old:
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Min=377.000 Max=32767.000 Computed Min/Max=377.000,32767.000
Minimum=377.000, Maximum=32767.000, Mean=27526.311, StdDev=11176.835
summary new:
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Min=377.000 Max=32767.000 Computed Min/Max=377.000,32767.000
Minimum=377.000, Maximum=32767.000, Mean=27526.311, StdDev=11176.835
---------------------- full output --------------------------------
old server:
# /opt/FWTools/bin_safe/gdalinfo -mm -stats temp.tif
Driver: GTiff/GeoTIFF
Files: temp.tif
Size is 8800, 6600
Coordinate System is:
PROJCS["WGS 84 / Plate Carree",
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.2572235629972,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","32662"]]
Origin = (-13914936.349159199744463,6094982.029363029636443)
Pixel Size = (1011.995370847942013,-1008.370376304165802)
Metadata:
AREA_OR_POINT=Area
Collection Location=USF Institute for Marine Remote Sensing
Data Source Type=Direct Broadcast
Input
File(s)=/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.194420.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.194650.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.194920.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.195150.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.195420.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.194420.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.194650.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.194920.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.195150.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.195420.hdf
L3 Software Name=/usr/bin/map_modis.pl
L3 Software Version=4.2
Map Limit=-5, -125, 55, -45
Map Projection Category=Proj 4.4.7
Map Projection Name=eqc
Proj Projection Parameters=#Equidistant Cylindrical (Plate Caree)
# Cyl, Sph
# lat_ts=
# +proj=eqc +ellps=WGS84
Processing Status=final
Satellite=aqua
Spatial Resolution=1km
Temporal Resolution=pass
_FillValue=[65535]
band_name=1
corrected_counts_offset=-0
corrected_counts_scale=0.124973
corrected_counts_units=counts
long_name=Earth View 250M Aggregated 1km Reflective Solar Bands
Scaled Integers Band 1
radiance_offset=-0
radiance_scale=0.0246418
radiance_units=Watts/m^2/micrometer/steradian
reflectance_offset=-0
reflectance_scale=4.72967e-05
reflectance_units=none
units=none
valid_range=[0 32767]
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-13914936.349, 6094982.029)
Lower Left (-13914936.349, -560262.454)
Upper Right (-5009377.086, 6094982.029)
Lower Right (-5009377.086, -560262.454)
Center (-9462156.717, 2767359.788)
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Computed Min/Max=377.000,32767.000
Minimum=377.000, Maximum=32767.000, Mean=27526.311, StdDev=11176.835
Metadata:
STATISTICS_MINIMUM=377
STATISTICS_MAXIMUM=32767
STATISTICS_MEAN=27526.311392114
STATISTICS_STDDEV=11176.834697473
new server:
# gdalinfo -mm -stats temp.tif
Driver: GTiff/GeoTIFF
Files: temp.tif
temp.tif.aux.xml
Size is 8800, 6600
Coordinate System is:
LOCAL_CS["WGS 84 / Plate Carree",
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"]],
AUTHORITY["EPSG","32662"],
UNIT["metre",1]]
Origin = (-13914936.349159199744463,6115512.029363029636443)
Pixel Size = (1011.995370847942013,-1008.370224789014287)
Metadata:
_FillValue=[65535]
AREA_OR_POINT=Area
band_name=1
Collection Location=USF Institute for Marine Remote Sensing
corrected_counts_offset=-0
corrected_counts_scale=0.124973
corrected_counts_units=counts
Data Source Type=Direct Broadcast
Input
File(s)=/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.194420.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.194650.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.194920.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.195150.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD021KM.2014061.195420.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.194420.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.194650.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.194920.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.195150.hdf,
/tmp/s4p_run_map_modis_2.3_2HwoEbWy/MYD03.2014061.195420.hdf
L3 Software Name=/usr/bin/map_modis.pl
L3 Software Version=4.2
long_name=Earth View 250M Aggregated 1km Reflective Solar Bands
Scaled Integers Band 1
Map Limit=-5, -125, 55, -45
Map Projection Category=Proj 4.4.7
Map Projection Name=eqc
Processing Status=final
Proj Projection Parameters=#Equidistant Cylindrical (Plate Caree)
# Cyl, Sph
# lat_ts=
# +proj=eqc +ellps=WGS84
radiance_offset=-0
radiance_scale=0.0246418
radiance_units=Watts/m^2/micrometer/steradian
reflectance_offset=-0
reflectance_scale=4.72967e-05
reflectance_units=none
Satellite=aqua
Spatial Resolution=1km
Temporal Resolution=pass
units=none
valid_range=[0 32767]
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-13914936.349, 6115512.029)
Lower Left (-13914936.349, -539731.454)
Upper Right (-5009377.086, 6115512.029)
Lower Right (-5009377.086, -539731.454)
Center (-9462156.717, 2787890.288)
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Min=377.000 Max=32767.000 Computed Min/Max=377.000,32767.000
Minimum=377.000, Maximum=32767.000, Mean=27526.311, StdDev=11176.835
Metadata:
STATISTICS_MAXIMUM=32767
STATISTICS_MEAN=27526.311392114
STATISTICS_MINIMUM=377
STATISTICS_STDDEV=11176.834697473
-------------------------------------------------------------------------
This is the problem step:
gdalwarp -rcs -ts 8800 6600 -s_srs EPSG:32662 -t_srs EPSG:4326 temp.tif
target.tif
gdalinfo -mm -stats target.tif
is showing that the range of values in the image are dramatically
different on the two servers!
summary old:
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Computed Min/Max=-3877.000,32767.000
Minimum=-3877.000, Maximum=32767.000, Mean=25235.731, StdDev=10612.642
summary new:
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Min=-9314.000 Max=32561.000 Computed Min/Max=-9314.000,32561.000
Minimum=-9314.000, Maximum=32561.000, Mean=19166.800, StdDev=7786.806
Ok, so you can see that the values are radically different. My question
is how do I get values like the old system? These values represent
temperatures and I need to get the same values.
My one thought on this is that if is another side effrct of proj4
behaving differently as I had to adjust the position above to get it to
align. So maybe the gdalwarp is messing up the pixel values when it
reprojects it also. But I'm totally lost on how make this work correctly.
Any thoughts on how to fix this?
Thanks,
-Steve
--------------------------- full output -------------------------------
old server:
# /opt/FWTools/bin_safe/gdalinfo -mm -stats target.tif
Driver: GTiff/GeoTIFF
Files: target.tif
Size is 8800, 6600
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.2572235629972,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
Origin = (-125.000000000000128,54.752155134106310)
Pixel Size = (0.009090909090909,-0.009058345210874)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-125.0000000, 54.7521551) (125d 0'0.00"W, 54d45'7.76"N)
Lower Left (-125.0000000, -5.0329233) (125d 0'0.00"W, 5d 1'58.52"S)
Upper Right ( -45.0000000, 54.7521551) ( 45d 0'0.00"W, 54d45'7.76"N)
Lower Right ( -45.0000000, -5.0329233) ( 45d 0'0.00"W, 5d 1'58.52"S)
Center ( -85.0000000, 24.8596159) ( 85d 0'0.00"W, 24d51'34.62"N)
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Computed Min/Max=-3877.000,32767.000
Minimum=-3877.000, Maximum=32767.000, Mean=25235.731, StdDev=10612.642
Metadata:
STATISTICS_MINIMUM=-3877
STATISTICS_MAXIMUM=32767
STATISTICS_MEAN=25235.730898691
STATISTICS_STDDEV=10612.642070873
new server:
# gdalinfo -mm -stats target2.tif
Driver: GTiff/GeoTIFF
Files: target2.tif
Size is 8800, 6600
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 = (-125.000000000000000,54.936579261935996)
Pixel Size = (0.009090548058866,-0.009058564516722)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-125.0000000, 54.9365793) (125d 0' 0.00"W, 54d56'11.69"N)
Lower Left (-125.0000000, -4.8499465) (125d 0' 0.00"W, 4d50'59.81"S)
Upper Right ( -45.0031771, 54.9365793) ( 45d 0'11.44"W, 54d56'11.69"N)
Lower Right ( -45.0031771, -4.8499465) ( 45d 0'11.44"W, 4d50'59.81"S)
Center ( -85.0015885, 25.0433164) ( 85d 0' 5.72"W, 25d 2'35.94"N)
Band 1 Block=8800x1 Type=Int16, ColorInterp=Gray
Computed Min/Max=-9314.000,32561.000
Minimum=-9314.000, Maximum=32561.000, Mean=19166.800, StdDev=7786.806
Metadata:
STATISTICS_MAXIMUM=32561
STATISTICS_MEAN=19166.799570351
STATISTICS_MINIMUM=-9314
STATISTICS_STDDEV=7786.8063693375
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