FW: [UMN_MAPSERVER-USERS] Problem with display of raster backdrop -- ECW files with overlap

[Stephen Clark]

Frank,

When you have some time could you investigate this problem.

Generally speaking if I create a tile using GDALTINDEX for a group of
ECW
Raster images that overlap, I cannot draw the raster tile index.

However If I convert the ECW files to Geotiff and then create a tile 
Using GDALTINDEX using your FWTOOLS then I am able to draw the raster
layer.

Also, Is there anyone else that has seen this problem.


Thanks
Stephen




-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Stephen Clark
Sent: September 23, 2005 2:49 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] Problem with display of raster backdrop
-- ECW files with overlap


Hi,

I am working on a mapserver application to display ECW orthophotos for
Southern Alberta where the orthophotos have overlap. 

I have created a tiled index layer for these orthos and am having
problems during the draw cycle when the orthos are turned on.

I have attached the layer file from mapserver:

LAYER
  NAME ecw_2003_tile
  TILEINDEX "e:/data/ecw_2003_index.shp"
  TILEITEM "location"
  TYPE RASTER
  STATUS ON
  TRANSPARENCY 60

  CLASS
	NAME "COLA 2003 Orthophotos"
  END

  METADATA
    WMS_TITLE "COLA 2003 Orthophotos"
    WMS_ABSTRACT "N/A"
    WMS_SRS "EPSG:26912"
  END

END


I have been able to draw the ortho layer when "zoomed in" to only one
ortho sheet that is visible but not when an ortho overlaps with another
ortho.

I am using MS4W and have tested this config with MS44 and MS46 with both
app crashing.


Any suggestions on how to go about fixing this problem.  





Regards,
Stephen Clark
GIS Coordinator
County of Lethbridge
#100, 905 - 4th Ave South, Lethbridge, Alberta,T1J 4E4
Main: (403)328-5525
Direct: (403)380-1578
Fax: (403)328-5602
email: sclark at county.lethbridge.ab.ca
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