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Re: Legend creation on an image [message #48904 is a reply to message #48902]

Fri, 02 June 2006 15:31

elsueniero
Messages: 5
Registered: May 2006

Junior Member

Thank you David,

I downloaded and tried it, and it work great.

But how can I put it inside the array of the image raw data?
After this, what I do is write the array into a geotiff. How can I add
this on a certain location it?

David Fanning wrote:
> elsueniero@gmail.com writes:
>
>> I am trying to create a legend similar to the ones shown here:
>> http://edcdaac.usgs.gov/modis/myd13a1v4.asp
>>
>> I already have my two vectors, one with the limits, and the other with
>> the colors:
>>
>> ndvi_color_map_index = [-1.0,0.0,0.028571429,0.057142857,0.085714286, $
>> 0.11428571,0.14285714,0.17142857,0.2, $
>> 0.25,0.3,0.35,0.40,0.46666667,0.53333333,0.6,0.7,0.8,0.9]
>>
>> ndvi_color_map_colors = [[0,0,0],[0,24,104],[254,254,254], $
>> [205,193,169],[199,186,169],[182,148,111],[170,129,75],[143, 115,65], $
>> [128,105,35],[148,183,19],[116,171,5],[102,162,2],[81,150,0] ,$
>> [62,129,0],[24,117,3],[1,92,13],[1,71,0],[5,56,5],[0,40,3],[ 2,16,0]]
>>
>> * note that n_elements(ndvi_color_map_index) + 1 ==
>> n_elements(ndvi_color_map_colors)
>> thats because all info bellow -1.0 should be black ([0,0,0]) and the
>> same with all the info above 0.9
>>
>> I have both the floating point image in "NDVIfloat" and the 3-band
>> color image in "NDVIcolor"
>>
>> Now what I need to do is to put on the lower-rigth 600x300 pixels of
>> the NDVIcolor image a legend the shown. (the image is 1300x1900 and I
>> now that those 600x300 is background)
>>
>> I know that with some for's I can put the colors bins, but how can I
>> put text on an array from IDL?? Is that possible??
>
> A colorbar with similar characteristics is described in this article:
>
> http://www.dfanning.com/map_tips/precipmap.html
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Legend creation on an image By: elsueniero on Sat, 03 June 2006 07:40
		Re: Legend creation on an image By: David Fanning on Fri, 02 June 2006 20:17
		Re: Legend creation on an image By: elsueniero on Fri, 02 June 2006 19:31
		Re: Legend creation on an image By: elsueniero on Fri, 02 June 2006 15:31
		Re: Legend creation on an image By: David Fanning on Fri, 02 June 2006 15:14

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