[gdal-dev] GdalWarp issue

[Frank Warmerdam]

Martin,

Could you file a ticket with the details on how to reproduce this?  It
should not normally be necessary to set SOURCE_EXTRA and even when it
is needed I would expect the difference to be with regard to whether
there are holes/cracks in the imagery, not duplication.  But it is
hard to be sure what is happening without a case to reproduce it.

Best regards,
Frank

On Mon, Mar 19, 2012 at 12:37 PM, Martin Chapman <chapmanm at pixia.com> wrote:
> Chaitanya,
>
>
>
> Thank you very much for your response.  The problem seems to be with the
> default SOURCE_EXTRA parameter of the GDALWarpOptions being defaulted to 1.
> When I up that number everything works fine.  I think the default for that
> value should be larger.  What do you think?
>
>
>
> Best regards,
>
> Marty
>
>
>
> From: Chaitanya kumar CH [mailto:chaitanya.ch at gmail.com]
> Sent: Monday, March 19, 2012 1:00 PM
> To: Martin Chapman
> Cc: gdal-dev at lists.osgeo.org
> Subject: Re: [gdal-dev] GdalWarp issue
>
>
>
> Martin,
>
> Change the resampling method and/or change the SAMPLE_STEPS warp option.
>
> On Tue, Mar 20, 2012 at 12:12 AM, Martin Chapman <chapmanm at pixia.com> wrote:
>
> All,
>
>
>
> Please see the attached sub-region screen capture of an image I created
> using gdalwarp 1.9.  I used MS Paint to highlight in red several columns of
> pixels that repeat a pattern from left to right across the image (vertically
> only) where the pixels are the same color for both pixel columns when in
> fact they should be different.  The problem seems to occur whether I am
> going from source wkt (wgs84 in this case) to the same coord system or if I
> go from wgs84 to another coord system.   It only seems to happen when the
> source image is in WGS84 though.
>
>
>
> Any help is much appreciated.
>
>
>
> Best regards,
>
> Martin
>
>
>
>
>
>
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>
>
>
> --
> Best regards,
> Chaitanya kumar CH.
>
> +91-9494447584
> 17.2416N 80.1426E
>
>
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