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    <p>Hi</p>
    <p><br>
    </p>
    <p>You can register custom projections in the config.json ->
      projections block.</p>
    <p><br>
    </p>
    <p>Hope this helps</p>
    <p>Sandro</p>
    <p><br>
    </p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 24.12.25 04:39, 김용운 빙하지권연구본부 via
      qgis-qwc2 wrote:<br>
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              <div>Hello,</div>
              <div><br>
              </div>
              <div>I am working on publishing a QGIS project to QWC2 in
                order to share Arctic Ocean datasets in a web
                environment.</div>
              <div><br>
              </div>
              <div>Because my datasets are located in the Arctic, I
                normally use EPSG:3996 (WGS 84 / Polar Stereographic) as
                the project CRS in QGIS. In desktop QGIS, this CRS works
                correctly and produces the expected visualization
                (Figure 1).</div>
              <div><br>
              </div>
              <div>However, when publishing the project to QWC2, the
                theme fails to load and QWC2 reports that “the
                projection EPSG:3996 is not defined” (Figure 2). Due to
                this limitation, I changed the project CRS to EPSG:3857
                so that the project can be loaded in QWC2.</div>
              <div><br>
              </div>
              <div>With this workaround, I encounter serious rendering
                issues for datasets crossing the 180° meridian
                (anti-meridian):</div>
              <div>- line and track features are split and rendered at
                both edges of the map,</div>
              <div>- and in some CRS combinations the geometries appear
                heavily distorted (Figures 3 and 5).</div>
              <div><br>
              </div>
              <div>For reference, these are the main configurations I
                tested:</div>
              <div>- Desired QGIS desktop view:</div>
              <div>  Project CRS = EPSG:3996, Layer CRS = EPSG:4326
                (Figure 1)</div>
              <div>- QWC2 workaround configuration:</div>
              <div>  Project CRS = EPSG:3857, Layer CRS = EPSG:3996
                (Figure 3)</div>
              <div><br>
              </div>
              <div>I tried multiple CRS combinations, but this setup
                provided the closest overall alignment in QWC2, although
                the anti-meridian splitting problem remains. I also
                tested several approaches suggested in documentation and
                online resources (e.g. tile-based basemaps, geometry
                correction), but none resolved the underlying issue.</div>
              <div><br>
              </div>
              <div>Since many of my Arctic datasets cross the 180°
                meridian, this problem affects a large portion of the
                data and prevents producing a visually continuous map.</div>
              <div><br>
              </div>
              <div>Could you please advise on:</div>
              <div>- whether EPSG:3996 can be properly supported in
                QWC2, or</div>
              <div>- the recommended workflow for publishing Arctic
                (polar) data in QWC2 without visual discontinuities at
                the anti-meridian?</div>
              <div><br>
              </div>
              <div>Any guidance regarding CRS configuration, QGIS Server
                / QWC2 settings, or preprocessing strategies would be
                greatly appreciated.</div>
              <div><br>
              </div>
              <div>Thank you very much for your help.</div>
              <div><br>
              </div>
              <div>Best regards,</div>
              <div><br>
              </div>
              <br>
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