[mapserver-users] Some queries return blank Images

[EdouardG]

Hello,

I am running mapserver 6.0.1 trought a cgi script with apache on a debian
VM.
I am trying to visualise images through WMS using a custom app I developped
based on the WorldWind API.
I prepared the images with gdal, tiled them, created a shapefile index and
overviews.
I configured Apache, redacted the mapfile etc. Everything works almost fine.

The problem is that when requesting my tiles i can see some of them but
others are returned blank.
I tried in ArcGIS, my WorldWind App and a browser. Some of the Images and
their associated tiles are always blank (always the same ones). I displayed
the images (that generate the blank images) and their tiles without any
problem in ArcMap but when going through mapserver something I dont know is
happening and messing up some of them.
I put my Layer in Debug and noticed something in the logfile :
When the tile is working I have :

[Wed Aug 12 09:58:22 2015].426335 msResampleGDALToMap in effect: cellsize =
0.000007
[Wed Aug 12 09:58:22 2015].426380 msDrawGDAL(Pipes_Layer): using
RAW_WINDOW=0 0 1639 1442, dst=0,0,8,7
[Wed Aug 12 09:58:22 2015].426390 msDrawRasterLayerGDAL():
red,green,blue,alpha bands = 1,0,0,0

When its not I have : 
[Wed Aug 12 09:58:22 2015].424930 msResampleGDALToMap in effect: cellsize =
0.000000
[Wed Aug 12 09:58:22 2015].424973 msDrawGDAL(Pipes_Layer): using
RAW_WINDOW=0 0 1 1, dst=0,0,1,1
[Wed Aug 12 09:58:22 2015].424984 msDrawRasterLayerGDAL():
red,green,blue,alpha bands = 1,0,0,0
[Wed Aug 12 09:58:22 2015].425405 msInitProjTransformer() returned NULL.

So I can deduce something is wrong here, but I dont really understand why...
I am pretty new in this thing and my knowledge stops here...
All the Images come from the same survey and have been through the same
processing.

I will gladly give you any information you might need to investigate this
issue.

I hope I have been clear enough...

Thank you in advance for your help.




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