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<p>Hello Andreas & Kirk,</p>
<p>Thanks very much for your suggestions. I also got help from the
regional Gov't GIS Manager. He suggested trying the REST source
(server?) through the QGIS ArcGIS Map Service
(<a class="moz-txt-link-freetext" href="https://mapservices.crd.bc.ca/arcgis/rest/services">https://mapservices.crd.bc.ca/arcgis/rest/services</a>). It worked
and the misalignment disappeared! In QGIS, toggling the two
different 2019 orthophotos showed them jumping by about 1.5 m.
Several miles away, the result was the same.<br>
</p>
<p>The REST source did the trick although the underlying data is the
same.</p>
<p>The REST property lines were identical to the WMS version.</p>
<p>Not sure why this works but will use the REST server in the
future.</p>
<p>Thanks again for your help . . . <br>
</p>
<pre class="moz-signature" cols="72">-----
Cheers, Spring</pre>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">On 08/Apr/2021 05:48, kirk wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1617886110942.0befce262d1b581d@nortekresources.com">
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<div dir="auto">Hi Springer. </div>
<div dir="auto"> </div>
<div dir="auto">My mistake, you will require a local grid shift
file, BC_93_05.gsb. The NTv2 is a national NAD27</div>
<div dir="auto">to NAD83 grid shift file. The BC_93_95 provides
localized conversion from Nad83 (original) to Nad83 (csrs). </div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto" id="composer_signature">
<div dir="auto" style="font-size:85%;color:#575757">Sent from my
Galaxy</div>
</div>
<div dir="auto"><br>
</div>
<div><br>
</div>
<div style="font-size:100%;color:#000000" dir="auto" align="left">
<div>-------- Original message --------</div>
<div>From: Springfield Harrison <a class="moz-txt-link-rfc2396E" href="mailto:stellargps@gmail.com"><stellargps@gmail.com></a> </div>
<div>Date: 2021-04-08 5:24 a.m. (GMT-04:00) </div>
<div>To: Andreas Neumann <a class="moz-txt-link-rfc2396E" href="mailto:a.neumann@carto.net"><a.neumann@carto.net></a> </div>
<div>Cc: qgis-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-user@lists.osgeo.org"><qgis-user@lists.osgeo.org></a> </div>
<div>Subject: Re: [Qgis-user] WMS Image Projection </div>
<div><br>
</div>
</div>
<p>Hi Andreas,</p>
<p>Thanks for the reply, I'll try to clarify:</p>
<ol>
<li>Version is 3.16.4</li>
<li>The two municipal sources are being viewed in their own web
windows and are displaying the same data<br>
</li>
<ol>
<li>They are the source of the property lines for my GIS
(downloaded shapefile) and the orthophoto (WMS link, not
resident TIFF or other)<br>
</li>
</ol>
<li>The property lines are <span style="font-family:'Lato,Open
Sans,Lucida Grande,Segoe UI,Arial,sans-serif';
color:#000000;">EPSG:3157 - NAD83(CSRS) / UTM zone 10N -
Projected, and from the municipal source. I've attached the
shapefile if you have the time.<br>
</span></li>
<li>In QGIS, the ortho is loaded from the WMS source<br>
</li>
<ol>
<li><a
href="https://mapservices.crd.bc.ca/arcgis/services/OrthoImagery2019/MapServer/WMSserver"
style="color: rgb(114, 159, 207); font-family: arial,
sans-serif; font-size: 14.399999618530273px; font-style:
normal; font-variant-caps: normal; font-weight: normal;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space:
normal; widows: auto; word-spacing: 0px;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0.4);
-webkit-text-stroke-width: 0px;" moz-do-not-send="true">https://mapservices.crd.bc.ca/arcgis/services/OrthoImagery2019/MapServer/WMSserver</a></li>
<li><span style="color: rgb(0, 0, 0); font-family: Lato, 'Open
Sans', 'Lucida Grande', 'Segoe UI', Arial, sans-serif;
font-size: 14.399999618530273px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space:
normal; widows: auto; word-spacing: 0px;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0.4);
-webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); display: inline !important; float: none;">EPSG:26910
- NAD83 / UTM zone 10N - Projected</span></li>
</ol>
<li>The project CRS is EPSG: 26910 but it doesn't seem to change
anything by changing that or the source projections (at least
within versions of NAD83 UTM Zone 10N)<span style="color:
rgb(0, 0, 0); font-family: Lato, 'Open Sans', 'Lucida
Grande', 'Segoe UI', Arial, sans-serif; font-size:
14.399999618530273px; font-style: normal; font-variant-caps:
normal; font-weight: normal; letter-spacing: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-tap-highlight-color: rgba(0, 0,
0, 0.4); -webkit-text-stroke-width: 0px; background-color:
rgb(255, 255, 255); display: inline !important; float:
none;"><br>
</span></li>
<li>Thus, the same information displays differently online <i>versus</i>
in QGIS.<span style="color: rgb(0, 0, 0); font-family: Lato,
'Open Sans', 'Lucida Grande', 'Segoe UI', Arial, sans-serif;
font-size: 14.399999618530273px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: auto; word-spacing: 0px;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0.4);
-webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); display: inline !important; float: none;"></span></li>
<ol>
<li>The shift seems to be 1.5 m +/-, quite a lot for what I'm
trying to do (building permit with tight setbacks).<br>
<span style="color: rgb(0, 0, 0); font-family: Lato, 'Open
Sans', 'Lucida Grande', 'Segoe UI', Arial, sans-serif;
font-size: 14.399999618530273px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space:
normal; widows: auto; word-spacing: 0px;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0.4);
-webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); display: inline !important; float: none;"></span></li>
<li><span style="color: rgb(0, 0, 0); font-family: Lato, 'Open
Sans', 'Lucida Grande', 'Segoe UI', Arial, sans-serif;
font-size: 14.399999618530273px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space:
normal; widows: auto; word-spacing: 0px;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0.4);
-webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); display: inline !important; float: none;">These
are commonly used projections for our neck of the woods</span></li>
<li><span style="color: rgb(0, 0, 0); font-family: Lato, 'Open
Sans', 'Lucida Grande', 'Segoe UI', Arial, sans-serif;
font-size: 14.399999618530273px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space:
normal; widows: auto; word-spacing: 0px;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0.4);
-webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); display: inline !important; float: none;">The
two images I sent earlier depict the differences; in QGIS,
earlier orthophotos show a similar or worse displacement.
Not so on the municipal web viewer.</span></li>
</ol>
<li>I've read up on projections in the tutorial and Help file,
no revelations there, at least that I could see.</li>
</ol>
<p>Thanks very much for any thoughts you may have.</p>
<pre class="moz-signature" cols="72">-----
Cheers, Spring</pre>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 08/Apr/2021 00:47, Andreas Neumann
wrote:<br>
</div>
<blockquote type="cite">
<p>Hi,</p>
<p>Are there two different CRS involved here? Are the vectors
(parcel boundaries) in a different CRS than the orthoimages?
This might be a problem of a missing grid-shift file in QGIS.</p>
<p>It is also unclear for me if you load your Orthoimages
locally (from tiff-files as well) or from WMS (or both) and
only one of them is shifted?</p>
<p>Can you also add information what QGIS version with what proj
version you use? You can find this information in the about
dialogue in the help menu.</p>
<p>Greetings,</p>
<p>Andreas</p>
<p id="reply-intro">On 2021-04-08 02:37, Springfield Harrison
wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left:
#1010ff 2px solid; margin: 0">
<div class="pre" style="margin: 0; padding: 0; font-family:
monospace"><span style="white-space: nowrap;">Hello All,</span><br>
<br>
<span style="white-space: nowrap;">Re obtaining orthophotos from a WMS server.</span><br>
<br>
Locally we have orthophotos that can be brought into QGIS
using the WMS service. They are also viewable on the local
government web map service. In both cases I can compare
them to the property lines which are from the same source.<br>
<br>
On the government web pages (2), the orthophotos and the lot
lines appear to coincide very well. In QGIS, the same two
layers are quite misaligned.<br>
<br>
One would suspect a CRS problem but changing the CRS of the
Project and the WMS image in QGIS has no effect. Even
followed the tutorial to no effect.<br>
<br>
I'm attaching screen shots of the two results. Ant thoughts
would be appreciated, thank you . . . .<br>
<br>
<span style="white-space: nowrap;">-----</span><br>
<span style="white-space: nowrap;">Cheers, Springfield Harrison</span><br>
<br>
<br>
</div>
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