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Re: Retrieve pixel values from GeoTIFF [message #73790 is a reply to message #73789]

Sat, 27 November 2010 12:06

penteado
Messages: 866
Registered: February 2018

Senior Member
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On Nov 27, 4:53 pm, mankoff <mank...@gmail.com> wrote:
> I'm trying to get the pixel values (color) from a GeoTIFF file when I
> have lat,lon arrays. I have the projection set up using MAP_PROJ_INIT,
> and using MAP_PROJ_FORWARD I can convert from my latitude and
> longitude to map coordinates, but the map coordinates appear to be in
> units meter from some reference location. What is the best routine to
> convert from lat,lon (or u,v) to x,y indices?

It seems that map_proj_forward() can do what you want, you are just
not giving it the right projection parameters. What is in the geotiff
structure?

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[Message index]

		Re: Retrieve pixel values from GeoTIFF By: David Fanning on Sat, 27 November 2010 13:03
		Re: Retrieve pixel values from GeoTIFF By: David Fanning on Sat, 27 November 2010 12:59
		Re: Retrieve pixel values from GeoTIFF By: David Fanning on Sat, 27 November 2010 12:52
		Re: Retrieve pixel values from GeoTIFF By: mankoff on Sat, 27 November 2010 12:45
		Re: Retrieve pixel values from GeoTIFF By: David Fanning on Sat, 27 November 2010 12:13
		Re: Retrieve pixel values from GeoTIFF By: penteado on Sat, 27 November 2010 12:06

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