[mapserver-users] Problem loading geotifs

[Rahkonen Jukka]

Hi,

My guess is that the data area of your Landsat images are not North-South oriented and they have triangular no-data areas in the corners.  Adjacent images are overlapping when you view them together and no-data area from one image is covering the real data of the image underneath. The cure is to use OFFSITE in the mapfile to tell what pixel value should be made transparent. No-data value is often stored in the geotiff metadata and you can check it with gdalinfo. Perhaps most often it is all black (0 0 0). But this is just a guess and if I did not hit, please 
- send a gdalinfo report of one image
- send the command you used for tiling
- send the LAYER definition you have used in the mapfile

-Jukka Rahkonen-


-----Alkuperäinen viesti-----
Lähettäjä: mapserver-users-bounces at lists.osgeo.org puolesta: ecodavid at rci.rutgers.edu
Lähetetty: la 23.10.2010 21:04
Vastaanottaja: mapserver-users at lists.osgeo.org
Aihe: [mapserver-users] Problem loading geotifs
 
I am trying to add Landsat7 images to my mapserver project.  I have
downloaded the images in geotif format from the USGS.  These images
correspond to a rectangular snapshot over the region.  Since multiple
geotiffs are needed to cover my region, I am tiling the images using gdal.

Here is the problem I am having: The geotiffs render only partially.  For
example, the top half of the image will render, and the bottom half will
not.  I have opened the geotiff files in several image editors and can
view the entire region, so I am assuming that the problem is somewhere in
the Mapserver rendering.  Also, I have tried inserting the image directly
(i.e. not using tiling) and get the same result.

Can anyone help me out?
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