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Last Post 08 Aug 2010 07:53 AM by  anon
Projection problems...
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anon



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08 Aug 2010 07:53 AM
    Hello- I am working through a year's worth of MODIS data and calculating EVI. I have the IDL script working fine, but am having some issues with the input MODIS files. Upon loading each one, I get the following warning: "File: E:\File Path\Filename.bsq Projection:Geographic Problem: An unknown Projection is referenced in the map information. Unable to use." But if you look in the hdr file(se bottom of page) , I am not sure what is missing from the raw MODIS reflectance data? If I OK out of it, the script continues to process fine, but it takes babysitting the processing. Any insight would be greatly appreciated... -Eric The associated .hdr file has the following information: ENVI description = { ENVI File, Created [Sat Aug 07 14:46:40 2010]} samples = 14040 lines = 6000 bands = 7 header offset = 0 file type = ENVI Standard data type = 2 interleave = bsq sensor type = Unknown byte order = 0 map info = {Geographic, -122.9979, 51.2479, -124.99791700, 49.24791700, 4.1669998318e-003, 4.1669998318e-003, WGS-84, units=Degrees} wavelength units = Unknown geo points = { -123.9979, 50.2479, 49.24791718, -124.99791718, -65.5021, 50.2479, 49.24791718, -66.50207520, -123.9979, 25.2521, 24.25208092, -124.99791718, -65.5021, 25.2521, 24.25208092, -66.50207520}

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    11 Aug 2010 11:37 AM
    It looks to me like the problem may be that the map info in the header lists the projection as "Geographic". When you georeference to lat/long in ENVI, it always lists the projection as "Geographic Lat/Lon" in the header. So, I'm guessing that ENVI doesn't know a projection by the name of "Geographic" only. That is also pretty much what the error message seems to be saying. So, then, the question is how that projection name got into your map info in the header? Did you put it there? How exactly are you opening these MODIS files in your code?
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