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

[TC Haddad]

Hi Antonis,

How are you adding the service from MapServer to OpenLayers?

Can you confirm that you are indeed using WMS and not the WFS configuration
that is also in your map file?

Tanya

On Wed, Sep 28, 2022 at 4:47 AM Antonis Christofides <
antonis at antonischristofides.com> 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:
>
> [image: enter image description here]
>
> Here is the same thing, but slightly panned to the right:
>
> [image: 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&" <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&" <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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