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I want to use pgRouting for showing shortest path on hiking trails. I created web map so I need to enable users when they click on start and end point somewhere on hiking trails, that it shows shortest path between those two points. I am beginner with it, so I just need to tell me where to start. I have those lines in postgis database and I am working with phpPgAdmin and Mapserver.

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This question is much too broad. You should try some books on web mapping, first. –  Sean Jun 15 '11 at 13:00
    
I developed web map which need to have this shortest path function. I don't think it is too broad. I just want you to tell me how to start. I am beginner with pgRouting, not with web mapping. –  againstflow Jun 15 '11 at 13:03

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up vote 3 down vote accepted

First you'll need to get pgRouting running. For a tutorial check: A Beginner’s Guide to pgRouting.

The simplest approach is to do node-to-node routing using shortest_path().

You'll need to enable the user to pick start and end node for their routings. For example code check: Picking a Feature’s Attribute Value From a WMS Layer With OpenLayers

In Mapscript, you can then tie a "Get Routing" button to a function that loads a new layer based on the shortest_path() query.


Update:

This is a great tutorial for creating a webmap with routing functionality: http://workshop.pgrouting.org/chapters/geoext_client.html It is based on OpenLayers with GeoExt and pgRouting, but it's easy to adjust it to any other routing webservice.

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UGh, our IT just blocked wordpress.com, can you provide a direct link so I can wget it perhaps? –  dassouki Jun 15 '11 at 13:45
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@dassouki use Google Translate then hit the Orginal option (top right corner) translate.google.com/… too work around your IT url blocker... –  Mapperz Jun 15 '11 at 13:58
    
@Mapperz - Still Blocked –  dassouki Jun 15 '11 at 14:38

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