[MapServer-users] WMS: Not all features show, depending on how I zoom and pan

[Antonis Christofides]

Hello,

I have a problem that has already been discussed in stackexchange 
(https://gis.stackexchange.com/questions/440902/mapserver-wms-not-all-features-show-depending-on-how-i-zoom-and-pan), 
but without solution so far.

I'm repeating the full text here, but if there's any problem with the images it 
might be better to go to stackexchange to read it.

Here is how QGIS shows an irrigation network, received by MapServer via WMS and 
superimposed on OpenStreetMap:

enter image description here

Here is the same thing, but slightly panned to the right:

enter image description here

Several items are obviously missing. In fact there are items missing in the top 
picture as well. Different items become visible as I zoom and pan differently.

Since this pretty much tells the whole story, I'm not going into more details. 
MapServer version is 7.6.2 (prepackaged for Debian). The base URL is 
https://poros.irmasys.com/cgi-bin/mapserv?map=/opt/aira-poros/aira-poros/mapserver/extralayers.map. 
Finally, below I paste the interesting parts of the mapfile.

Thanks!

Antonis




|MAP NAME "aira-poros" STATUS ON SIZE 9040 7731 EXTENT 103986.57 3850796.18 
1007945.14 4623933.00 UNITS meters PROJECTION "init=epsg:2100" END CONFIG 
MS_ERRORFILE "/var/log/mapserver/extralayers.log" # [Omitting some OUTPUTFORMAT 
sections] WEB IMAGEPATH "/var/cache/mapserver/" IMAGEURL "/mapserver_tmp/" 
METADATA "wms_title" "Aira Poros" "wms_onlineresource" 
"https://poros.irmasys.com/cgi-bin/mapserv?map=/opt/aira-poros/aira-poros/mapserver/extralayers.map&" 
"wms_srs" "EPSG:4326 EPSG:2100 EPSG:3857" "wms_enable_request" "*" 
"wms_feature_info_mime_type" "text/html" "wfs_title" "Aira Poros" 
"wfs_onlineresource" 
"https://poros.irmasys.com/cgi-bin/mapserv?map=/opt/aira-poros/aira-poros/mapserver/extralayers.map&" 
"wfs_srs" "EPSG:2100 EPSG:4326 EPSG:3857" "wfs_enable_request" "*" END END LAYER 
NAME "irrigation-network" TYPE LINE CONNECTIONTYPE OGR CONNECTION 
"irrigation-network.gml" METADATA "wms_title" "Irrigation network" "wfs_title" 
"Irrigation network" "gml_include_items" "all" "gml_featureid" "id" END STATUS 
ON PROJECTION "init=epsg:2100" END CLASSITEM 'category' CLASS EXPRESSION '1' 
STYLE COLOR 0 0 255 OPACITY 50 WIDTH 6 END LABEL COLOR 0 0 255 ANGLE FOLLOW 
OFFSET 5 99 MAXSCALEDENOM 10000 TEXT "[irri_code]" END LABEL COLOR 0 0 255 ANGLE 
FOLLOW OFFSET -8 99 MAXSCALEDENOM 10000 EXPRESSION (NOT('[Diameter]' = '')) TEXT 
"D=[Diameter] mm" END END # [Omitting three more classes] END # [Omitting four 
more layers] END|
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