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<div class="moz-cite-prefix">Hi Chris<br>
<br>
On 27/11/2015 11:35, Chucker one wrote:<br>
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<div>Hi All,<br>
<br>
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I am doing some research to see if QGIS could replace some of
the propriety GIS software at the company I work for. QGIS
will primarily be used for viewing vectors and digitizing from
satellite and aerial images. For processing we generally use
custom python and C++ scripts and programs. <br>
<br>
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<div>The vector data we use can range from a few MB to GB in
size which contain thousands to millions of features per
dataset. There for I have proposed to move from a file based
vector format to a PostGIS database. <br>
<br>
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Great choice. <br>
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<div>My questions are:<br>
<br>
<ol>
<li>Are there any benchmarking stats for the latest LTS
QGIS? If not, how would I go about benchmarking QGIS?<br>
</li>
</ol>
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Here's a benchmarking link I found:
<a class="moz-txt-link-freetext" href="http://hub.qgis.org/projects/quantum-gis/wiki/Rendering_Performance">http://hub.qgis.org/projects/quantum-gis/wiki/Rendering_Performance</a><br>
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<li>I have enabled multi-core rendering, </li>
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good<br>
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<li>render caching, </li>
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good<br>
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<li>and increased the zoom factor to 5 </li>
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not sure what you mean here?<br>
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<li>and created spatial indices for vectors and pyramids for
rasters</li>
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good<br>
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<ol>
<li>, which have greatly improved rendering performance.
However, I still encountered a lot of mini dumps and not
responding errors (Win 7 64bit) when doing basic panning
and editing on large datasets. What other settings/options
are there to increase performance?</li>
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<br>
<br>
- Set scale thresholds so rendering only occurs at appropriate
scales. <br>
- Use rule-based classification to apply different scale thresholds
to different filters. <br>
- For rasters, create virtual rasters (image catalogs), possibly
further process images to add internal tiling and other
optimisations or consider serving them from a WMS server or tile
store. <br>
<br>
In General Options - > rendering:<br>
- tweak refresh rate / update interval<br>
- enable server-side feature simplification<br>
<br>
Is all your data local? If not, then network constraints might be
coming in to play. <br>
<br>
Report the dumps and errors at <a class="moz-txt-link-freetext" href="http://hub.qgis.org">http://hub.qgis.org</a> if they are
repeatable. <br>
<br>
Gavin<br>
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<div>Just in case, I do not think hardware is an issue, since
most of the computers have 12 core CPUs, 16GB to 64GB ram,
500GB-1TB SSDs and high end Gfx cards.<br>
<br>
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<div>Thanks in advance<br>
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<div>Chris<br>
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