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<p>Hello Seth,</p>
<p>Thanks for replying. I experimented and found out there's no
difference if I use something minimal such as what you suggested.
What does make a difference is the CRS: if I tell QGIS to use
EPSG:2100 (Greek grid—the CRS the data files use), then everything
works fine. If I use 4326 or 3857, then the problem appears.
Therefore it appears that the problem is with reprojecting (as the
stackexchange user "nmtoken" had suspected). Leaflet seems to be
requesting 3857.</p>
<p>What would be the right course of action here? Should I tell
Leaflet to do the reprojection instead? Should I investigate
further why mapserver has trouble reprojecting (and how would I do
that)? Should I reproject my data files (GML) offline and store
them in 3857 instead of 2100? Is there any common/best practice
regarding this?</p>
<p>Thanks!</p>
<p>Antonis</p>
<p><br>
</p>
<p><br>
</p>
On 28/09/2022 17.47, Seth G wrote:<br>
<blockquote type="cite"
cite="mid:895e9d3d-cc0e-4a4f-adcd-a76ba66db6c2@app.fastmail.com">
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<style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style>
<div>Hi,<br>
</div>
<div><br>
</div>
<div>Is there any change if you update the layer to have a single
class with a simple line (no EXPRESSION, LABEL, MAXSCALEDENOM)?<br>
</div>
<div><br>
</div>
<div>E.g.<br>
</div>
<div><br>
</div>
<div> CLASS<br>
</div>
<div> STYLE<br>
</div>
<div> COLOR 0 0 255<br>
</div>
<div> WIDTH 6<br>
</div>
<div> END<br>
</div>
<div><br>
</div>
<div>Seth<br>
</div>
<div><br>
</div>
<div id="sig62266145">
<div class="signature">--<br>
</div>
<div class="signature">web:<a href="https://geographika.net"
moz-do-not-send="true" class="moz-txt-link-freetext">https://geographika.net</a><br>
</div>
<div class="signature">twitter: @geographika<br>
</div>
</div>
<div><br>
</div>
<div>On Wed, Sep 28, 2022, at 1:03 PM, Antonis Christofides wrote:<br>
</div>
<blockquote type="cite" id="qt" style="">
<p>Hello,<br>
</p>
<p>I have a problem that has already been discussed in
stackexchange
(<a class="qt-moz-txt-link-freetext moz-txt-link-freetext"
href="https://gis.stackexchange.com/questions/440902/mapserver-wms-not-all-features-show-depending-on-how-i-zoom-and-pan"
moz-do-not-send="true">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.<br>
</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.<br>
</p>
<p>Here is how QGIS shows an irrigation network, received by
MapServer via WMS and superimposed on OpenStreetMap:<br>
</p>
<p><img src="https://i.stack.imgur.com/bCOib.png" alt="enter
image description here" moz-do-not-send="true"><br>
</p>
<p>Here is the same thing, but slightly panned to the right:<br>
</p>
<p><img src="https://i.stack.imgur.com/Ca7Tc.png" alt="enter
image description here" moz-do-not-send="true"><br>
</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.<br>
</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="qt-moz-txt-link-freetext
moz-txt-link-freetext"
href="https://poros.irmasys.com/cgi-bin/mapserv?map=/opt/aira-poros/aira-poros/mapserver/extralayers.map"
moz-do-not-send="true">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.<br>
</p>
<p>Thanks!<br>
</p>
<p>Antonis<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div><br>
</div>
<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="qt-moz-txt-link-rfc2396E" href="https://poros.irmasys.com/cgi-bin/mapserv?map=/opt/aira-poros/aira-poros/mapserver/extralayers.map&" moz-do-not-send="true">"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="qt-moz-txt-link-rfc2396E" href="https://poros.irmasys.com/cgi-bin/mapserv?map=/opt/aira-poros/aira-poros/mapserver/extralayers.map&" moz-do-not-send="true">"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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</blockquote>
<div><br>
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