I would do a sanity check first, just to make sure the 2 raster files
are truly the same. Try something like:
gdalinfo -stats -hist file1.tif
gdalinfo -stats -hist file2.tif
Then, I would continue with the .map files, to make sure they are the
same. Something like:
diff serv1.map serv2.map
See what falls out.
On 1/9/25 13:10, Dylan Beaudette via MapServer-users wrote:
Hi Everyone,
I've got identical GeoTiffs and .map files on two servers with varying
versions of Mapserver that is being used as a TMS. Mapserver 7.2.2 is (I
think) correctly using the overviews while Mapserver 7.6.4 is not.
Here is an example of the same file, tile, and styling applied across
both versions of Mapserver.
# Mapserver 7.2.2:
https://soilmap2-1.lawr.ucdavis.edu/cgi-bin/mapserv?map=/data1/website/
ste/
taxa.map&mode=tile&tilemode=gmap&tile=5+12+5&layer=blue9dylan&type=taxsubgrp&name=typic_xerofluvents&minvalue=5 <https://soilmap2-1.lawr.ucdavis.edu/cgi-bin/mapserv?map=/data1/website/ste/taxa.map&mode=tile&tilemode=gmap&tile=5+12+5&layer=blue9dylan&type=taxsubgrp&name=typic_xerofluvents&minvalue=5>
Mapserver 7.6.4:
https://soilmap4-1.lawr.ucdavis.edu/cgi-bin/mapserv?map=/data1/website/
ste/
taxa.map&mode=tile&tilemode=gmap&tile=5+12+5&layer=blue9dylan&type=taxsubgrp&name=typic_xerofluvents&minvalue=5 <https://soilmap4-1.lawr.ucdavis.edu/cgi-bin/mapserv?map=/data1/website/ste/taxa.map&mode=tile&tilemode=gmap&tile=5+12+5&layer=blue9dylan&type=taxsubgrp&name=typic_xerofluvents&minvalue=5>
It appears to me that the newer version is either ignoring or
interpreting the overviews differently. Each file has an internal tiling
and overview scheme like this:
----------------------------------------------------------------------------------
Band 1 Block=1766x4 Type=Byte, ColorInterp=Gray
NoData Value=0
Overviews: 883x1262, 442x631, 221x316, 111x158
----------------------------------------------------------------------------------
Does anyone have a clue about the differences? Is either version in error?
Thanks, and good to be back on the mailing list after a nearly 15 year
hiatus!
Dylan
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