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List: qgis-user
Subject: Re: [Qgis-user] digitizing
From: Patrick Dunford via Qgis-user <qgis-user () lists ! osgeo ! org>
Date: 2022-06-17 6:13:08
Message-ID: 4c583e27-3982-55c5-355f-33703b797174 () gmail ! com
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There are some times when the libraries can run out of memory if a
raster is very large, so you can have something that something like a
graphics editor e.g Gimp can open OK but Qgis coujld have trouble
opening it.
On 17/06/22 14:22, Firstname Lastname wrote:
> I think that there is something wrong with the Tif file I was using.
> I had the same problem with a couple of files but I went back to the
> source file and redid the referencing and it is ok.
>
> On Thu, Jun 16, 2022 at 7:46 PM Patrick Dunford via Qgis-user
> <qgis-user@lists.osgeo.org> wrote:
>
> This is a generic answer, as more information would be needed to
> determine exactly the situation you are experiencing.
>
> If you zoom to the layer, is it then displayed in the same place
> as the rest of your map?
>
> My recollection of the georeferencer is it produces a world file
> to go with the layer. This should have the correct top-left
> coordinates and pixel resolution in it. Is there also an XML file
> that specifies the CRS?
>
> Look at the layer name where it is loaded in the GIS and see if
> there is a question mark displayed next to its name, that
> indicates QGIS doesn't have enough information to position the
> layer, such as the information that is stored in sidecar files.
>
> It is also possible if the file is very large that it will be slow
> to display. Also have a look at the error log at the bottom of the
> screen to see if any error messages are displayed.
>
> On 17/06/22 04:23, Firstname Lastname via Qgis-user wrote:
>> i have been successfully using the georeferencer for some time.
>> i referenced several maps and they succesfully georeferenced
>> and displayed for me.
>> Then, i was digitizing and i ran the georeference tool and for
>> some reason, the new referenced maps do not display. i have
>> exited and tried to georef in a new project and made sure that i
>> have the same CRS for the basemap and the georef tool but when i
>> run the referencer, the layer appear but the map will not
>> display. i have tried restarting, clearing the georef tool and
>> running again but i get the same result. Does anyone know what
>> i am doing wrong and why my referenced maps will not display?
>>
>> --
>> Byron Veilleux, MSc. P.Geo
>> Conjugate Geologic Services Limited
>> Calgary, Alberta Canada
>> byron@conjugategeo.com
>> Cell:4037108414
>>
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
>> Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
> _______________________________________________
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
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> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
> Byron Veilleux, MSc. P.Geo
> Conjugate Geologic Services Limited
> Calgary, Alberta Canada
> byron@conjugategeo.com
> Cell:4037108414
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<p>There are some times when the libraries can run out of memory if
a raster is very large, so you can have something that something
like a graphics editor e.g Gimp can open OK but Qgis coujld have
trouble opening it.</p>
<div class="moz-cite-prefix">On 17/06/22 14:22, Firstname Lastname
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAAyYZQK7DLxb3JbvUz=DWnZf9QoCM60L9SSumBrVrTHxoyymgw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">I think that there is something wrong with the Tif
file I was using. I had the same problem with a couple of files
but I went back to the source file and redid the referencing and
it is ok. </div>
<div><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Jun 16, 2022 at 7:46
PM Patrick Dunford via Qgis-user <<a
href="mailto:qgis-user@lists.osgeo.org"
moz-do-not-send="true" \
class="moz-txt-link-freetext">qgis-user@lists.osgeo.org</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p>This is a generic answer, as more information would be
needed to determine exactly the situation you are
experiencing.</p>
<p>If you zoom to the layer, is it then displayed in the
same place as the rest of your map? <br>
</p>
<p>My recollection of the georeferencer is it produces a
world file to go with the layer. This should have the
correct top-left coordinates and pixel resolution in it.
Is there also an XML file that specifies the CRS?</p>
<p>Look at the layer name where it is loaded in the GIS
and see if there is a question mark displayed next to
its name, that indicates QGIS doesn't have enough
information to position the layer, such as the
information that is stored in sidecar files. <br>
</p>
<p>It is also possible if the file is very large that it
will be slow to display. Also have a look at the error
log at the bottom of the screen to see if any error
messages are displayed.<br>
</p>
</div>
<div>
<div>On 17/06/22 04:23, Firstname Lastname via Qgis-user
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">i have been successfully using the
georeferencer for some time. i referenced several
maps and they succesfully georeferenced and displayed
for me.
<div>Then, i was digitizing and i ran the georeference
tool and for some reason, the new referenced maps do
not display. i have exited and tried to georef in a
new project and made sure that i have the same CRS
for the basemap and the georef tool but when i run
the referencer, the layer appear but the map will
not display. i have tried restarting, clearing the
georef tool and running again but i get the same
result. Does anyone know what i am doing wrong and
why my referenced maps will not display?<br
clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr" data-smartmail="gmail_signature">
<div dir="ltr">Byron Veilleux, MSc. P.Geo
<div>Conjugate Geologic Services Limited</div>
<div>Calgary, Alberta Canada</div>
<div><a href="mailto:byron@conjugategeo.com"
target="_blank" moz-do-not-send="true"
\
class="moz-txt-link-freetext">byron@conjugategeo.com</a></div> \
<div>Cell:4037108414</div> </div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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</blockquote>
</div>
</div>
-- <br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">Byron Veilleux, MSc. P.Geo
<div>Conjugate Geologic Services Limited</div>
<div>Calgary, Alberta Canada</div>
<div><a href="mailto:byron@conjugategeo.com" target="_blank"
moz-do-not-send="true" \
class="moz-txt-link-freetext">byron@conjugategeo.com</a></div> \
<div>Cell:4037108414</div> </div>
</div>
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