| get LAT/LON from georef image [message #65092] |
Wed, 11 February 2009 02:35  |
titan
Messages: 59
Registered: March 2006
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Member |
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Hello! I have a georef image and I would like to extract the LAT and
LON values from it.
the dims of my image are not equal, let's say [65,80].
I create two vectors to be associated with the x_pixel and y_pixel of
the image
x_pixel=indgen(65)
y_pixel=indgen(80)
I know that there is the envi routine ENVI_CONVERT_FILE_COORDINATES to
convert X and Y pixel coordinates into their corresponding X and Ymap
coordinates and vice-versa.
Unfortunately it seems to work only if the lat and lon array are of
the same dimension in fact if we consider this example I should write
envi_convert_file_coordinates, fid, x_pixel, y_pixel, xmap, ymap, /
to_map
in this way I should have the respective vector xmap and ymap of lat
and lon
but if I write
help, xmap
help, ymap
I get
LAT_MAP DOUBLE = Array[65]
LON_MAP DOUBLE = Array[65]
two vector of the same dims (in this case 65) and one of 65 elements
and the other with 80 elements
Could someone tell me where I'm wrong??Are there any methods to
overpass this problem??
thanks
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| Re: get LAT/LON from georef image [message #65245 is a reply to message #65092] |
Thu, 19 February 2009 04:32  |
Jean H.
Messages: 472
Registered: July 2006
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Senior Member |
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titan wrote:
> Thank you for the answer Jean.
> probably I have to study more your suggestion because
> I tried it but what I get are two vectors with a bigger dimension than
> the initial one!
> is it possible or am I doing something wrong?
>
> thank you
Hi,
the dimension should be (nx * ny) (so 1D)
You can then reshape it to a (nx;ny) (2D)
Jean
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