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List:       qgis-developer
Subject:    [Qgis-developer] Postgresql provider - Use ST_RemoveRepeatedPoints for server-side simplification
From:       kimaidou <kimaidou () gmail ! com>
Date:       2015-10-30 10:50:55
Message-ID: CAMKXKO6ngmUEDqBSQ=sMw4vay88BZn+fM0w6YmUB2eR-Ec=tsg () mail ! gmail ! com
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Hi all

Following the blog post written by Paul Ramsey [1], I decided to propose
using PostGIS 2.2 ST_RemoveRepeatedPoints function instead of ST_SnapToGrid
to do the server side simplification

We could also investigate other new features, such as the 3rd parameter for
ST_Simplify, but we use St_SimplifyPreserveTopology in QGIS, and I do not
think this function has got this new parameter too.

I made a pull request : see [2]
Please help me to test and review it

[1] http://blog.cartodb.com/smaller-faster/
[2] https://github.com/qgis/QGIS/pull/2410

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<div dir="ltr"><div><div><div>Hi all<br><br></div>Following the blog post written by \
Paul Ramsey [1], I decided to propose using PostGIS 2.2 ST_RemoveRepeatedPoints \
function instead of ST_SnapToGrid to do the server side \
simplification<br><br></div><div>We could also investigate other new features, such \
as the 3rd parameter for ST_Simplify, but we use St_SimplifyPreserveTopology in QGIS, \
and I do not think this function has got this new parameter \
too.<br></div><div><br></div>I made a pull request : see [2]<br></div>Please help me \
to test and review it <br><div><div><div><br>[1] <a \
href="http://blog.cartodb.com/smaller-faster/">http://blog.cartodb.com/smaller-faster/</a><br>[2] \
<a href="https://github.com/qgis/QGIS/pull/2410">https://github.com/qgis/QGIS/pull/2410</a><br></div></div></div></div>



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