[mapserver-users] raster tiling of non rectangular images

[Steve Lime]

I don't suppose there are shapefiles with Landsat footprints available
that would
help? If your data matched standard scene boundaries then perhaps you
could
build an index from that. ESRI's ArcWorld dataset had such a 

>>> On 7/8/2008 at 3:41 AM, in message
<856086.31991.qm at web23402.mail.ird.yahoo.com>, victor valencia
<vhva1976 at yahoo.es> wrote:
> Hi:
> 
> I need  to create a tileindex of several non-rectangular raster
images. I 
> tried GdaltIndex, but produces rectangular polygons including the
non-data 
> (Null) pixels. 
> These images i have are Landsat 7 saved as *.img, *.tiff, *.Sid. 
> These images are rhomboidal. Since the file is rectangular there is
an area 
> with no valid pixels (non-data or Null). I need a boundary polygon
that 
> exclude this pixels. 
> 
> I found an arcview 3x extension named Grid to Valid-pixel Polygon
Catalog w 
> Stats, that creates a boundary polygons of the valid pixels, but
works just 
> with Grid images. I could change the format of my images but this is
very 
> very time consuming. 
> 
>  Is there any script to create irregular bounding polygons
(non-rectangular) 
> from the valid pixels for several images?
> 
> Best regards
> 
> Victor
> 
> 
> 
>       ______________________________________________ 
> Enviado desde Correo Yahoo! La bandeja de entrada más inteligente.