[Geomoose-users] [Geomoose-developers] Raster & contours

[Fischer, Brian]

Adam,  the only way to get good performance out of large rasters like
that or even shapefiles for the matter is to tile them
(http://mapserver.gis.umn.edu/docs/howto/optimizeraster or
http://mapserver.gis.umn.edu/docs/howto/optimizevector) .  Also only let
your users display the layer at a lower scale.  To tile a layer you can
use some gdal/ogr utilities that come with MS4W.  Take a look at this
page for more guidance.  http://www.gdal.org/gdal_utilities.html and
http://www.gdal.org/ogr/ogr_utilities.html and
http://mapserver.gis.umn.edu/docs/reference/utilityreference/tile4ms. 

 

Hope this helps,

Brian

 

________________________________

From: geomoose-developers-bounces at lists.sourceforge.net
[mailto:geomoose-developers-bounces at lists.sourceforge.net] On Behalf Of
Adam Feidt
Sent: Friday, April 25, 2008 11:59 AM
To: geomoose-developers at lists.sourceforge.net;
geomoose-users at lists.sourceforge.net
Subject: [Geomoose-developers] Raster & contours

 

 

I've got a fairly large city-wide ArcInfo Grid that displays elevation
data loaded in a Moose project.  I'm trying to balance redraw times
without losing significant detail, but I am having problems because the
raster seems to be redrawing at different speeds.  Initially it will
redraw around 30-45 seconds.  Once it has loaded the redraw gets much
better around 2 to 5 seconds.  Eventually after a little while the
redraw goes back to 30-45 seconds.  Is mapserver caching the image for a
certain amount of time and after a specified time calling for it to
redraw?  Can I adjust the settings for this layer to never redraw or to
store the cache permanently?

 

Also, it appears when I zoom in and out or go to full extent enough
times the layers stall and won't redraw.  Is this a bug or how can I fix
this problem?

 

Adam M. Feidt

GIS Coordinator

City of Eden Prairie

8080 Mitchell Rd

Eden Prairie, MN 55344

phone# 952-949-8443

fax# 952-949-8334

 

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