| converting map projections in IDL and ENVI [message #41562] |
Wed, 17 November 2004 09:22  |
PieterBeck
Messages: 1
Registered: November 2004
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Junior Member |
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Dear forum users,
I want to convert the projection of georeferenced images whereby I specify
the coordinates of the upper left pixel in the resulting image (so the
pixel exactly match other georefenced images I have). The ENVI GUI
convert map projection function allows for this. However I need to use
IDL commands. Unfortunately, the envi_convert_file_map_projection doesn't
allow me to specify the coordinates of the upper left pixel in the result
image, as far I can tell. Any suggestions for doing it anyway?
Thank you in advance,
Pieter Beck
University of Troms�
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| Re: converting map projections in IDL and ENVI [message #41721 is a reply to message #41562] |
Sat, 20 November 2004 07:27  |
enod
Messages: 41
Registered: November 2004
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Member |
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There is no need to specify the upper-left pixel coordinates in the
projection conversion process. Only when you import a registered image
and the map infomation is not read successfully, you should specify the
projection and map information manually.
Tian
PieterBeck wrote:
> Dear forum users,
> I want to convert the projection of georeferenced images whereby I
specify
> the coordinates of the upper left pixel in the resulting image (so
the
> pixel exactly match other georefenced images I have). The ENVI GUI
> convert map projection function allows for this. However I need to
use
> IDL commands. Unfortunately, the envi_convert_file_map_projection
doesn't
> allow me to specify the coordinates of the upper left pixel in the
result
> image, as far I can tell. Any suggestions for doing it anyway?
>
> Thank you in advance,
> Pieter Beck
> University of Tromsø
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| Re: converting map projections in IDL and ENVI [message #41727 is a reply to message #41562] |
Fri, 19 November 2004 13:22 |
btt
Messages: 345
Registered: December 2000
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Senior Member |
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PieterBeck wrote:
> Dear forum users,
> I want to convert the projection of georeferenced images whereby I specify
> the coordinates of the upper left pixel in the resulting image (so the
> pixel exactly match other georefenced images I have). The ENVI GUI
> convert map projection function allows for this. However I need to use
> IDL commands. Unfortunately, the envi_convert_file_map_projection doesn't
> allow me to specify the coordinates of the upper left pixel in the result
> image, as far I can tell. Any suggestions for doing it anyway?
>
Hello,
There are a number of map projection routines in IDL, but it is not clear to me
how they could help you out. It would be helpful if you spell out...
What the coordinates of the pixel are in ... lon lat ?
What is the destination coordinate?
Perhaps you could give some example data for the coordinates.
Ben
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