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<p>I haven't been able to find out much about the render caching
feature. I am now running all my computer with the render caching
turned off, so that less memory and swap resources are consumed in
the computer. It might be intended with this feature to reduce the
time delay for downloading tiles from a remote server for people
that are using server based resources but would also have the (in
your case) less desirable consequence of consuming significant
amounts of data.<br>
</p>
<div class="moz-cite-prefix">On 20/03/19 8:22 PM, Pascale Hutter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:61A44228-339B-4DB6-95A3-4D689D8EE742@hintermannweber.ch">
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Hi Patrick
<div class=""><br class="">
</div>
<div class="">Thanks for you reply! It already helps me a lot, as
it confirm my impression of the new GIS caching far more data in
the memory. I was unsure whether this was really the case, as I
found nothing on the Internet about it. However, if you made the
same experience this means that there is something different in
the way it handles raster data.</div>
<div class=""><br class="">
</div>
<div class=""> I will check, if I can change something in the
settings for rendering, to solve the problem. If I do find
something, I will let you know. Would be really great if the
data volume could be decreased this way. Otherwise I can see no
way how I can use QGIS 3.x for small environmental projects,
which would be a pity.</div>
<div class=""><br class="">
</div>
<div class="">Thank you for your help!</div>
<div class=""><br class="">
</div>
<div class="">Pascale</div>
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<blockquote type="cite" class="">
<div class="">Am 19.03.2019 um 15:15 schrieb Patrick Dunford
<<a href="mailto:enzedrailmaps@gmail.com" class=""
moz-do-not-send="true">enzedrailmaps@gmail.com</a>>:</div>
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<p class="">I left this question for a few days because
I hoped someone with more technical knowledge than me
of how Qgis works with this type of data would be able
to answer your question. As a user I don't have the
same technical insight as one of the developers who
may be reading this question and more familiar with
data processing in the software.<br class="">
</p>
<p class="">I currently work with projects that use
large numbers of data layers of raster type, however
in my case they are all in files that I have
downloaded to my computer and loading locally, rather
than any type of data that could be accessed from an
online server.</p>
<p class="">I have found in experience with working with
raster layers that Qgis 3 is handling them quite
differently from previous versions (I have been using
Qgis since 1.8). It was not until version 2.14 that I
started working with the projects using these large
numbers of raster images, and have been using them
through 2.14, 2.16 and 2.18 and now in releases of
version 3.</p>
<p class="">The map projects I am working on cover a
part of New Zealand specifically a corridor around
6000 kilometres long and about 20 metres wide which is
covered by geojpeg rasters varying from 0.4 to 0.1
metre per pixel resolution and the size of each raster
is generally 4800x7200 pixels.<br class="">
</p>
<p class="">The experience I had is that Qgis 3.x
appears to be caching a lot more raster data in memory
than I saw with 2.x and it seems to be caching every
raster in my project, not just the ones that I am
displaying at the moment. It uses up the resources in
my system a lot faster than 2.x ever did. And if I use
larger size raster files, I have seen it run out of
resources on the system more than once. <br class="">
</p>
<p class="">So in terms of the way it consumes resources
for rasters, my experience is more related to the way
I see it using up the physical resources on my
computer like the physical or virtual memory. I ended
up adding more RAM to my system and more swap disk
space to help deal with the extra drain on resources
that has happened since upgrading to version 3.<br
class="">
</p>
<p class="">There is a section in the settings dialog
that specifically relates to rendering. I'm not
completely confident this is the type of situation
that would be relevant to your scenario. It may affect
my situation more if I spent some time playing with
these settings (render caching for example) but it
might not be so relevant to you, unless the render
caching is causing the software to download a lot of
raster data from your WMS server. You could try
experimenting with some of those settings.</p>
<div class="moz-cite-prefix">On 20/03/19 2:08 AM,
Pascale Hutter wrote:<br class="">
</div>
<blockquote type="cite"
cite="mid:CA4EB22E-FB1C-4572-AB18-F7BAF8312BBC@hintermannweber.ch"
class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
Hi Patrick
<div class=""><br class="">
</div>
<div class="">Thanks for your interest! Its raster
data of aerial images (<a
href="https://shop.swisstopo.admin.ch/de/products/geoservice/swisstopo_geoservices/swisstopoWMS"
class="" moz-do-not-send="true">https://shop.swisstopo.admin.ch/de/products/geoservice/swisstopo_geoservices/swisstopoWMS</a>).
I often use this for small environmental projects of
mine, where I have no budget to buy any additional
data. So far the 5’000 Megapixel were enough to work
during the whole year. Now it was finished up within
a month, although I did much less work. </div>
<div class="">I did read, that the whole wms-layer
part was newly written for the QGIS version 3.x, so
maybe this has something to do with it? </div>
<div class=""><br class="">
</div>
<div class="">Thank you for any kind of help!</div>
<div class=""><br class="">
</div>
<div class="">Pascale</div>
<div class=""> </div>
<div class=""><br class="">
<div class="">
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class="">
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class="">
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class="">
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-webkit-text-stroke-width: 0px;"
class="">
<div class=""><span class=""
style="orphans: 2; widows: 2;
font-family: Arial;">M. Sc. Biologie</span></div>
<div class=""><span class=""
style="orphans: 2; widows: 2;
font-family: Arial;">–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––<br
class="">
Hintermann & Weber AG |
Ökologische Beratung, Planung und
Forschung<br class="">
Austrasse 2a | CH-4153 Reinach<br
class="">
–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––<br
class="">
Telefon 061 717 88 87 | Fax 061 717
88 89<br class="">
</span><span class="" style="orphans:
2; widows: 2;"><font class=""
face="Arial"><a
href="mailto:hutter@hintermannweber.ch"
class="" moz-do-not-send="true">hutter@hintermannweber.ch</a> | <a
href="http://www.hintermannweber.ch/" class="" moz-do-not-send="true">www.hintermannweber.ch</a></font><br
class="">
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class="">
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Reinach BL / Bern / Montreux</font></span></div>
<div class=""><span class=""
style="orphans: 2; widows: 2;"><font
class="" face="Arial"><br class="">
</font></span></div>
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style="orphans: 2; widows: 2;"><font
class="" face="Arial">Anwesenheit
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<blockquote type="cite" class="">
<div class="">Am 19.03.2019 um 13:33 schrieb
Patrick Dunford <<a
href="mailto:enzedrailmaps@gmail.com"
class="" moz-do-not-send="true">enzedrailmaps@gmail.com</a>>:</div>
<br class="Apple-interchange-newline">
<div class="">
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content="text/html; charset=UTF-8" class="">
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<p class="">What is the type of data which
is within your wms layer. Is this vector
or raster type of data?<br class="">
</p>
<div class="moz-cite-prefix">On 19/03/19
12:59 AM, Pascale Hutter wrote:<br
class="">
</div>
<blockquote type="cite"
cite="mid:42FA060A-32BF-4855-8C85-09D681F826D1@hintermannweber.ch"
class="">
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8"
class="">
Hi there,
<div class=""><br class="">
</div>
<div class="">I’m quite new to QGIS
version 3, and was before working with
QGIS 2.18. I often use wms-layer, where
I purchase a certain data-volume (p. ex.
5’000 pixel) to work with. However, with
the new QGIS 3.0 this data volume is
used up far more quickly. In QGIS 2.18
it lasted a lot longer. I was wondering
if any of you mades some similar
experiences? Do you have any idea, if
there is a way to change the settings so
the data volume would last longer again?</div>
<div class=""><br class="">
</div>
<div class="">Thank you very much for any
suggestions! </div>
<div class=""><br class="">
</div>
<div class="">
<div class="">Pascale</div>
</div>
<div class="">
<div class="">
<div style="letter-spacing: normal;
orphans: auto; text-align: start;
text-indent: 0px; text-transform:
none; white-space: normal; widows:
auto; word-spacing: 0px;
-webkit-text-stroke-width: 0px;
word-wrap: break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space;" class="">
<div style="letter-spacing: normal;
orphans: auto; text-align: start;
text-indent: 0px; text-transform:
none; white-space: normal; widows:
auto; word-spacing: 0px;
-webkit-text-stroke-width: 0px;
word-wrap: break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space;" class="">
<div style="letter-spacing:
normal; orphans: auto;
text-align: start; text-indent:
0px; text-transform: none;
white-space: normal; widows:
auto; word-spacing: 0px;
-webkit-text-stroke-width: 0px;
word-wrap: break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space;" class="">
<div style="letter-spacing:
normal; orphans: auto;
text-align: start;
text-indent: 0px;
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white-space: normal; widows:
auto; word-spacing: 0px;
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0px; word-wrap: break-word;
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after-white-space;" class="">
<div style="font-family:
Helvetica; font-size: 12px;
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-text-stroke-width:
0px;" class=""><span
class="" style="orphans:
2; widows: 2;"><font
class="" face="Arial"><br
class="">
</font></span></div>
<div style="font-family:
Helvetica; font-size: 12px;
font-style: normal;
font-variant-caps: normal;
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letter-spacing: normal;
orphans: auto; text-align:
start; text-indent: 0px;
text-transform: none;
white-space: normal; widows:
auto; word-spacing: 0px;
-webkit-text-stroke-width:
0px;" class=""><br class="">
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class="Apple-interchange-newline">
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