Thanks Jeff,
This is very useful information. I have been experimenting with
FlatGeobuf for the last couple of weeks, but I missed the part about
setting verify buffer to No. I must continue now to optimize my mapfiles
tomorrow. Generally, I am very pleased with the FlatGeobuf files in
Mapserver so far.
/Lars Schylberg
Den 2022-04-25 kl. 21:32, skrev Jeff McKenna:
Hi all,
I've spent some effort to document how to enable the optimized
FlatGeobuf (FGB) format for vectors in MapServer, for both
reading/access as well as steps to output FGB through WFS (you could
also use these same steps for WMS GetFeatureInfo output of FGB as
well): https://mapserver.org/input/vector/flatgeobuf.html
The user community might be interested also in some performance
testing that I've done with FlatGeobuf with MapServer (hardcore
developers might question my exact methods, but for general users
these results should be interesting). I've added the results as a
note in the Vector Optimization document (
https://mapserver.org/optimization/vector.html )
I used shp2img/map2img to test the map drawing speed for a few popular
vector formats (note that these are averaged times, and are not done
on a cold connection), with the latest MapServer 8.0-dev code on
Windows through MS4W:
Shapefile 0.011s
FlatGeobuf 0.014s
GeoPackage 0.042s
SpatiaLite 0.045s
PostGIS 0.053s
GeoJSON 0.089s
The point is not to cause controversy or start analyzing my simple
testing methods, but instead to generally show how optimized
FlatGeobuf is for rendering (and filtering) in MapServer, and that we
should all be considering this format for sharing vectors through our
MapServer services.
Thanks,
-jeff
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