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<p>Hello,</p>
<p>I have a problem that has already been discussed in stackexchange
(<a class="moz-txt-link-freetext" href="https://gis.stackexchange.com/questions/440902/mapserver-wms-not-all-features-show-depending-on-how-i-zoom-and-pan">https://gis.stackexchange.com/questions/440902/mapserver-wms-not-all-features-show-depending-on-how-i-zoom-and-pan</a>),
but without solution so far.</p>
<p>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.</p>
<p>Here is how QGIS shows an irrigation network, received by
MapServer via WMS and superimposed on OpenStreetMap:</p>
<p><img src="https://i.stack.imgur.com/bCOib.png" alt="enter image
description here"></p>
<p>Here is the same thing, but slightly panned to the right:</p>
<p><img src="https://i.stack.imgur.com/Ca7Tc.png" alt="enter image
description here"></p>
<p>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.</p>
<p>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
<a class="moz-txt-link-freetext" href="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</a>.
Finally, below I paste the interesting parts of the mapfile.</p>
<p>Thanks!</p>
<p>Antonis</p>
<p><br>
</p>
<p><br>
</p>
<br>
<pre><code>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" <a class="moz-txt-link-rfc2396E" href="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&"</a>
"wms_srs" "EPSG:4326 EPSG:2100 EPSG:3857"
"wms_enable_request" "*"
"wms_feature_info_mime_type" "text/html"
"wfs_title" "Aira Poros"
"wfs_onlineresource" <a class="moz-txt-link-rfc2396E" href="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&"</a>
"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</code></pre>
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