Luca Manganelli wrote:
Thank you for the reply. I have already seen those pages: I have
already tiled the big shp (42 MB) into 8x8 pieces.
But my question is:
at the highest scale, rendering an 8x8 shp of 42MB is slow.
Well, that's not a question, just a fact. :)
Seriously, though:
Have you run shptree to create a spatial index? If so, are you sure that
your shapefile is NOT specifying the .shp extension?
Wrong:
DATA "streets/tiger.shp"
Right:
DATA "streets/tiger"
And what about your mapfile's classifications? Is the map drawing every
street segment with every request? That can be a killer! Use classes to
break them up into highways for large views, and streets for closer-up
views. If you're already using a spatial index, then most of the time is
probably not scanning the shapefiles but rather in drawing the shapes,
so let's see the appropriate mapfile layer.
--
Gregor Mosheh / Greg Allensworth
System Administrator, HostGIS cartographic development & hosting services
http://www.HostGIS.com/
"Remember that no one cares if you can back up,
only if you can restore." - AMANDA
