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Map to data coordinate conversion [message #83931]

Thu, 18 April 2013 07:19

PMan
Messages: 61
Registered: January 2011

Member

Hello all,

I am looking to convert, given a geotff image with map info, the lat/lon data to a pixel location in an image.

What I want to do seems pretty easy, but I am having a hard time coding it in IDL for some reason. I must be missing something.

Using the ENVI() API, this was straight forward:

oEnvi = envi(/headless)
eMask = oEnvi->openRaster(file)
fid = ENVIRasterToFID(eMask)
envi_convert_file_coordinates, fid, xf, yf, lon, lat

with lon, lat being my predefined input and xf, yf being my desired output.

The analogous way to do this in IDL is (I think):

img = image(file, /buffer)
xy = img->convertcoord(lon, lat, /to_data)

however the image() function won't read the geotiff properly (but ENVI() accepts it just fine). Perhaps my geotiff tag is not properly formed or something. Ideas on another way?

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Map to data coordinate conversion

By: PMan on Thu, 18 April 2013 07:19

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