riteshambastha wrote:
Thanks Steve,
Route computation is taking an average time of 1.2 sec.
Post this, showing route on the browser takes a lot of time.
I am not using kamap xml overlay and any lib of openlayers.
I am posting this route result xml into a db, and allowing a map file to
read this db and show the route on map.
I know this is not an efficient way to do the job.
I would start by adding some timing to a log file so you KNOW where your
time is getting spent, then work on optimizing the larger times.
I think this is the fastest way to go unless the route is relatively
small in the number of nodes in the polyline. You should look at getting
rid of the xml, in fact, why are you going to xml at all and then
putting it back into the database. The data is being generate in the
database then you extract it and format it into xml and then put the xml
back into the database for mapserver to pick up. I think you should just
put it into a table of routes with a unique sessionid+routeid key then
pass the key to mapserver to use on selecting the right record.
I got to know that openlayers libs can help me to achieve the same. I want
to know how in-efficient will be to use kamap xml overlay instead of any fn
of openlayers.
You can server the route as a wfs layer, but if it is complicated it
might be too many points to handle quickly in the browser.
-Steve
Regards,
Ritesh Ambastha
Stephen Woodbridge wrote:
riteshambastha wrote:
Dear friends,
I have seen routing based on postgis routing and oracle network data
models.
Even though, they serve the purpose very efficiently, they take some
1sec/2sec/3sec to display the routes. I checked them with OpenLayers and
Ka-map. Still, I feel there must be a way to reduce this route display
time.
Is there any any other ways to show routing/directions over mapserver
based
maps? Any other data structure and programming in C/python can serve the
purpose ?
What is taking too long?
1) is it the route computation
2) transfering the route data to OpenLayers
3) rendering the route data as a vector layer
Have you considered writing some code on the server that generates an
image file from the route data and returns a url for the image that can
be then pinned to OpenLayers like a marker? You could do this by writing
a wrapper in your favorite scripting language around the request to
generate the route.
-Steve W
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