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Re: map_set stereographic projection [message #48507 is a reply to message #48506]

Thu, 27 April 2006 11:51

dvila
Messages: 13
Registered: April 2006

Junior Member

David,

Certainly I started with that link but I couldn't deal with the limit
keyword on map_set routine because the four corners of the image have
different latitude and longitude (due to the projection, I supposed).
Otherwise, I have all other data (to compare with these ones) in a
lat-lon regular grid projection...

You can find an image in

http://essic.umd.edu/~dvila/ftp/

It's daily precipitation data (in mm) with 9.999E20 as missing data.
Thanks again!

Daniel
David Fanning wrote:
> dvila writes:
>
>> I'm trying to deal with a pre-projected polar stereographic image with
>> this geometrical characteristics:
>>
>> # It is a 1121x881 polar stereographic grid.
>> # Point (1,1) is at 23.117N 119.023W.
>> # Point (1,881) is at 53.509N 134.039W.
>> # Point (1121,1) is at 19.805N 80.750W.
>> # Point (1121,881) is at 45.619N 59.959W.
>> # The y-axis is parallel to 105W.
>> # The resolution is 4.7625km at 60N.
>> # The pole point is (I,J) = (400.5,1600.5)
>>
>> I don't know how may I set the map_set routine to fit the map with the
>> data. Is it possible to work with pre-projected data?
>
> On occasion. See, for example:
>
> http://www.dfanning.com/map_tips/georeference.html
>
>> On the other hand, can I change the projection to a regular lat-lon
>> grid in IDL?
>
> Probably not. :-)
>
> I don't know the definitive answers to these questions, but
> I have a reason to find out. Where can I find one of these
> images you are trying to fit a map projection to?
>
> 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: map_set stereographic projection By: David Fanning on Fri, 28 April 2006 07:24
		Re: map_set stereographic projection By: James Kuyper on Fri, 28 April 2006 06:40
		Re: map_set stereographic projection By: David Fanning on Fri, 28 April 2006 06:35
		Re: map_set stereographic projection By: peter.albert@gmx.de on Fri, 28 April 2006 05:08
		Re: map_set stereographic projection By: dvila on Fri, 28 April 2006 04:23
		Re: map_set stereographic projection By: peter.albert@gmx.de on Fri, 28 April 2006 01:33
		Re: map_set stereographic projection By: dvila on Thu, 27 April 2006 12:29
		Re: map_set stereographic projection By: David Fanning on Thu, 27 April 2006 12:14
		Re: map_set stereographic projection By: dvila on Thu, 27 April 2006 11:51
		Re: map_set stereographic projection By: David Fanning on Thu, 27 April 2006 07:23
		Re: map_set stereographic projection By: peter.albert@gmx.de on Tue, 02 May 2006 00:56
		Re: map_set stereographic projection By: mattie on Fri, 28 April 2006 09:58

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