[MAPSERVER-USERS] Any other Routing solution than pgRouting/Oracle NDM ?

[riteshambastha]

Yeah Jon,

I fully agree with you. I completely agree with the fact that 'Route
Computation' and giving an XML response is not taking much time. The only
bottleneck is in parsing the xml and rendering it on the map which consumes
more time. 

Regards,
Ritesh Ambastha

Jon Scarbrough wrote:
> 
> Ritesh,
> 
> I need to weigh in little bit since we are using the Oracle 
> Geocoder/Routeserver in conjunction with the Navteq data set.  Our 
> experience is that on a well tuned Oracle appserver/db cluster, an 
> normal route will calculate in about .5 secs. But, there is a lot of 
> tuning to get your java engine properly configured to deal with garbage 
> collection and you must have enough memory to hold sufficient partitions 
> in memory so you don't have to go back to disk.
> 
> We then take the Oracle route response and convert it to xml that is 
> sent back to the browser and have Openlayers lay it on the map using 
> SVG/VML. The biggest amount of time is spent parsing the XML and 
> creating the SVG. There are a lot of moving parts and as Steve 
> mentioned, you need to measure each part (route server, web server 
> handling the conversion of route response to the browser, Openlayers 
> layer manipulation).
> 
> In my experience, the Oracle router is not the bottleneck.
> 
> Thanks.
> 
> Jon Scarbrough
> Where2GetIt.com
> 
> 
> riteshambastha wrote:
>> Thanks Steve, 
>>
>> I am pretty sure your words are making a mapserver enthusiast's life very
>> easy. 
>>
>> For Route computation I am using a licensed version of Oracle Spatial DB.
>> Now, as PostGIS is looking so promising in the market, I am also thinking
>> to
>> shift to PostGIS. 
>>
>> And after that, I will re-engineer my routing code using : 
>>   
>>> pgRouting
>>> Ka-map xmlOverlay
>>>     
>>
>> I guess I am going in the right direction.
>>
>> Regards,
>> Ritesh Ambastha
>>
>>
>>
>> Stephen Woodbridge wrote:
>>   
>>> 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
>>>>> _______________________________________________
>>>>> mapserver-users mailing list
>>>>> mapserver-users at lists.osgeo.org
>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>>>
>>>>>
>>>>>         
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>>>
>>>     
>>
>>   
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