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Re: an envi question- extracting the pixel values of seveal points with lat-lon values [message #51130 is a reply to message #51037]

Fri, 27 October 2006 16:14

Jeff N.
Messages: 120
Registered: April 2005

Senior Member

gis_learner wrote:
> Dear All,
>
> I know that this is not right place for envi. But the message dates of
> the envi pages are rather old. Thus I wrote here,
>
> I have several points (25 app.) with their lat and long values at hand.
>
> I have to extract the pixel values that they fall in image. Images
> belong to dfferent dates and there are about 150 images. Is there a
> quick way other than using the pixel locator ? :(
>
> Best Regards

Have a look at the ENVI routine ENVI_CONVERT_FILE_COORDINATES.
Although I've never used it, from looking at the ENVI help files this
routine is the one you will need in order to take the lat/long values
for your points and figure out which pixels (file coordinates) you will
need to read values for. So you can write a routine that loops through
each of your input images, opens them, gets the pixel values you need,
and then reads those values.

Hope that helps,
Jeff

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[Message index]

		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: gis_learner on Wed, 01 November 2006 07:44
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: jeffnettles4870 on Tue, 31 October 2006 13:55
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: Jean H. on Tue, 31 October 2006 12:39
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: Jeff N. on Tue, 31 October 2006 12:16
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: Jeff N. on Tue, 31 October 2006 12:15
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: David Fanning on Tue, 31 October 2006 09:09
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: MarioIncandenza on Tue, 31 October 2006 09:06
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: Jeff N. on Fri, 27 October 2006 16:14
		Re: an envi question- extracting the pixel values of seveal points with lat-lon values By: jeffnettles4870 on Thu, 02 November 2006 13:18

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