| Re: Geotiff coor [message #56403 is a reply to message #56339] |
Tue, 23 October 2007 02:29  |
krastoboy
Messages: 8
Registered: October 2007
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Junior Member |
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On 19 Ott, 12:54, "devin.wh...@gmail.com" <devin.wh...@gmail.com>
wrote:
> The easiest thing to do, since you have access to ENVI, would be to
> use the RESIZE_DOIT procedure. It will generate an ENVI format
> version of your data with the correct map information, which you can
> then send to a GeoTIFF using ENVI_OUTPUT_TO_EXTERNAL_FORMAT.
>
> On Oct 18, 7:30 am, krasto...@gmail.com wrote:
>
>> Hello everybody out there,
>
>> here's a question on writing a geotiff with envi-idl
>> I've resized a geotiff in smaller parts and saved them.
>> My problems is how to get the correct cordinates on the new files.
>> I get the new image with envi_get_data setting the /DIM as i need it.
>
>> My code:
>
>> ; try to get the geotiff structure from the original file for the
>> resized image
>> ;using x and y as center of a square image (801x801) that I have to
>> cut
>
>> width=801
>> height=801
>> result=read_tiff(filename, SUB_RECT=[x-400, y+400, width, height],
>> geotiff=variable)
>
>> ;write the new geotiff resized
>
>> write_tiff, newname, imgdata, geotiff=variable, /short
>
>> IDl write me a file with the right coor system but with wrong
>> coordinates.
>> Using sub_rect didn' help to get the coord i need..
>> Have you any suggestion?
>
>> Cheers
>
>> Lo
Thanks everybody,
at the end I was working with the metadata of the whole original image
e not with the metadata of the cutted one.
I had to enter the gortiff structure and set the new coordinates from
there.
Cheers
Lorenzo
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