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Re: how to make lat/long grid for MODIS in IDL [message #86495 is a reply to message #86494]

Wed, 13 November 2013 18:03

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

dm_gty88 writes:

> Thanks for the reply! I've tried to do it but to no avail. Here's the code I used:
>
> ; Opens the file
> fileID = HDF_SD_START('MOD09A1.A2002081.h29v07.005.2007136054406.hdf' , /read)
> index1 = HDF_SD_NAMETOINDEX(fileID, 'sur_refl_b01')
> dataset1 = HDF_SD_SELECT(fileID, index1)
> HDF_SD_GETDATA, dataset1, data1
> HDF_SD_ENDACCESS, dataset1
>
> ; Reverses the file to make it upright
> data1r = reverse(data1, 2)
>
> ; Setup map projection
> smap = MAP_PROJ_INIT('Sinusoidal', LIMIT=[10,111.6969,20,127.7102])
>
> ; Forward transform
> fmap = MAP_PROJ_FORWARD(data1r, MAP_STRUCTURE=smap)
>
> When I print, fmap all I get is an array of zeroes.

I can imagine, since the data values are not in EITHER latitude OR
longitude! Where are the latitude and longitude values of your corner
pixels? You told us you had those.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		how to make lat/long grid for MODIS in IDL By: dm_gty88 on Tue, 08 October 2013 20:45
		Re: how to make lat/long grid for MODIS in IDL By: Fabzi on Wed, 09 October 2013 00:31
		Re: how to make lat/long grid for MODIS in IDL By: David Fanning on Thu, 10 October 2013 06:35
		Re: how to make lat/long grid for MODIS in IDL By: dm_gty88 on Tue, 29 October 2013 22:52
		Re: how to make lat/long grid for MODIS in IDL By: dm_gty88 on Wed, 30 October 2013 00:48
		Re: how to make lat/long grid for MODIS in IDL By: David Fanning on Wed, 30 October 2013 05:53
		Re: how to make lat/long grid for MODIS in IDL By: dm_gty88 on Wed, 13 November 2013 16:30
		Re: how to make lat/long grid for MODIS in IDL By: David Fanning on Wed, 13 November 2013 18:03
		Re: how to make lat/long grid for MODIS in IDL By: dm_gty88 on Thu, 14 November 2013 03:35
		Re: how to make lat/long grid for MODIS in IDL By: David Fanning on Thu, 14 November 2013 05:55

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