[Gdal-dev] .hdr labelled binary float raster

[Bborie Park]

Howdy all,

I'm working on a large set of FLT32 binary files with two possible 
headers (ESRI and ENVI).  When I use the ENVI headers, the computed 
min/max values (-9999, 33.735) are correct to the raster while the ESRI 
headers have min/max values of 0 to 255.

The outputs from gdalinfo with each header are:

ENVI header:

C:\Documents and Settings\dustymugs\Desktop\TOPS>gdalinfo -mm 
TOPSTMAX.CA1KM.20070924.flt
Driver: ENVI/ENVI .hdr Labelled
Size is 738, 1203
Coordinate System is:
LOCAL_CS["dayment",
     UNIT["Meter",1]]
Origin = (-2037330.654000000100000,-39780.983000000000000)
Pixel Size = (1000.000000000000000,-1000.000000000000000)
Corner Coordinates:
Upper Left  (-2037330.654,  -39780.983)
Lower Left  (-2037330.654,-1242780.983)
Upper Right (-1299330.654,  -39780.983)
Lower Right (-1299330.654,-1242780.983)
Center      (-1668330.654, -641280.983)
Band 1 Block=738x1 Type=Float32, ColorInterp=Undefined
   Description = ROI Mask (westernHemp_1km_nearest)
     Computed Min/Max=-9999.000,33.735

ESRI header:

C:\Documents and Settings\dustymugs\Desktop\TOPS>gdalinfo -mm 
TOPSTMAX.CA1KM.20070924.flt
Driver: EHdr/ESRI .hdr Labelled
Size is 738, 1203
Coordinate System is `'
Origin = (-2037330.654000000100000,-39280.983000000007000)
Pixel Size = (1000.000000000000000,-1000.000000000000000)
Corner Coordinates:
Upper Left  (-2037330.654,  -39280.983)
Lower Left  (-2037330.654,-1242280.983)
Upper Right (-1299330.654,  -39280.983)
Lower Right (-1299330.654,-1242280.983)
Center      (-1668330.654, -640780.983)
Band 1 Block=738x1 Type=Byte, ColorInterp=Undefined
     Computed Min/Max=0.000,255.000
   NoData Value=-9999

When I import the raster with the ESRI header to ArcInfo, the min and 
max ranges are correct.

Is there something wrong with gdal working with the ESRI header when 
compared to the ENVI header?  For the sake of repeatability, I've posted 
the raster and associated files (hdr and prj) to:

http://dev.calsurv.org/TOPS.zip

Any details and suggestions would be greatly appreciated.

Thanks,
Bborie



-- 
Bborie Park
Programmer
Center for Vectorborne Diseases
UC Davis
530-752-8380
bkpark at ucdavis.edu