Hi Martin,
There is a bug in Save As which may be responsible for the problem you are
having. The details are as follows:
------------------------
After using the Hand Roam tool(as opposed to the zoom-box tool) then saving
out the current view (and the page constraint is set to anything but "Fixed
Page: extents from zoom") the wrong image is saved out. Instead of using
the bottomright coordinate of the current view, the bottomright coordinate
of the original algorithm is used. Using the zoom-box tool is OK however,
and once zoom has been applied to the image using the zoom-box tool,
subsequent zooming (in or out) using the Hand Roam tool will work when using
the saveas feature.
In addition, saveas works (extents of image to be saved are correct) when
the window is resized, after zoom has been applied with the Hand Roam tool.
------------------------
The warper uses different logic to Save As when resampling, so this should
provide an adequate workaround.
David Carter
QA Officer - ER Mapper
Earth Resource Mapping
Introducing Raster and Vector Integration
Image Web Server 1.6 Released
www.EarthEtc.com
> -----Original Message-----
> From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Martin Kjelgaard
Rosengreen
> Sent: Friday, 3 August 2001 7:43 PM
> To: '[EMAIL PROTECTED]'
> Subject: Geometrical errors in downsampling
>
>
> Hello list,
>
> When I save a dataset in lower resolution (using 'Save as'), I get a big
> destortion i the geometry. Usually, the data in the middle of the image
fits
> with the original data, but along the edges errors corresponding to
several
> hundred pixels occur.
> Am I missing something, or is it how the process is supposed to function?
> Will the same happen if I use the warptool, and just resample with no
> reprojection?
>
> Thanks for any contribution.
>
> Cheers,
>
> Martin
> -----------------------------------------
> Martin Rosengreen
> GIS/Raster Consultant
> Kampsax Mapping Division
> Stamholmen 112
> 2650 Hvidovre
> Direct: +45 36 39 09 53
> Switchboard: +45 36 39 07 00
> E-mail: [EMAIL PROTECTED]
> http://www.kampsax.com
> -------------------------------------------
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