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

[Seth G]

Hi,

Is there any change if you update the layer to have a single class with a simple line (no EXPRESSION, LABEL, MAXSCALEDENOM)?

E.g.

        CLASS
            STYLE
                COLOR 0 0 255
                WIDTH 6
            END

Seth

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On Wed, Sep 28, 2022, at 1:03 PM, Antonis Christofides wrote:
> 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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> 
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