[GIS] Extracting nodes and edges from osm data

MATLABopenstreetmap

I am trying to extract the edges and nodes of a certain city from osm files and save them to a database. How can I accomplish this. I am not sure how much osm2po and osm2pgrouting tools are acceptable. I mean what is the standard procedure to get the graph. I mean when I use osm2po and tools like that they generate their own data structures. I mean they have this column called geometry of type multiline string and stuff. I am not sure if I should use this. Actually, I want to implement shortest path algorithm of my own.

I am not sure if osm is the only source to get such graph. Also, I want to plot the generated graph in matlab. How can I accomplish this?

Best Answer

You can find some MATLAB scripts to import openstreetmap files here: http://www.mathworks.com/matlabcentral/fileexchange/35819-openstreetmap-functions these include functions for plotting the map and network, as well as a routing example.

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[GIS] creating vector layer from OSM file using OpenLayers

OpenLayers OSM protocol does not know about 'visible' nodea, but you could easily extend the base class methods with a little bit of code that checks for the visibile attribute before adding the node to the list of nodes like the following (I hope your javascript-fu is strong, alsoe beware that this is untested code so it could not run right the first time):

    //Initialise the vector layer using OpenLayers.Format.OSM
    var pois_layer = new OpenLayers.Layer.Vector("Brussels POIs", {
        strategies: [new OpenLayers.Strategy.Fixed()],
        protocol: new OpenLayers.Protocol.HTTP({
            url: "brussels_center_filtered.osm",   
            format: new OpenLayers.Format.OSM({
                getNodes: function(doc) {
                        var node_list = doc.getElementsByTagName("node");
                        var nodes = {};
                        for (var i = 0; i < node_list.length; i++) {
                            var node = node_list[i];
                            if(node.getAttribute("visible")) {
                                var id = node.getAttribute("id");
                                nodes[id] = {
                                    'lat': node.getAttribute("lat"),
                                    'lon': node.getAttribute("lon"),
                                    'node': node
                                };
                            }
                        }
                        return nodes;
                    },
            })
            }),
            projection: new OpenLayers.Projection("EPSG:4326")
        });

[GIS] How to build a Spatialite road network from OSM data

You can use our free converter for changing OSM into a routable network, that splits at all intersections. This means OSM ways are changed into multiple links. Input is OSM XML files, output is for instance SHP. Find it at www.routeware.dk, download section.

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[GIS] creating vector layer from OSM file using OpenLayers

[GIS] How to build a Spatialite road network from OSM data

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