My App uses openstreetmap files to show waypoint (or coordinates) on a map.
Based on an Openstreet map file: how can I determine the shortest distance from a GPS coordinate to the (walking) path.
Can I read an OSM (map) or .osm file ... to access the paths?
There are some misconceptions. First, the OSM file is not the map file. The OSM file can be used to create a format to make map rendering fast e.g. mapsforge format does this.
With e.g. GraphHopper you import the OSM file like .pbf or .osm which then creates a graph which can be used for problems you described. Not exactly sure what problem you have though ;)
The following solution works:
Get the graphhopper project in your IDE.
Get the raw Openstreetmap data (.pbf) via this very nice provider.
Run this command in your (git) bash shell: ./graphhopper.sh -a import -i gelderland-latest.osm.pbf
Make a new (maven) project with this pom.xml file:
nl.xyz
graphhopper
1.0
system
${project.basedir}/libs/graphhopper-web-1.0-SNAPSHOT.jar
Copy generated graphhopper-web-1.0-SNAPSHOT.jar from the graphhopper project to the libs folder of your new project so it will be included in your path.
Copy the generated graphhopper data to a folder within your small project.
Create this simple demo:
public static void main(String[] args) {
private static String mapsFolder = "graphhopper-data/yourlocation-latest.osm-gh";
GraphHopper graphHopper = new GraphHopper().forMobile();
graphHopper.load(mapsFolder);
System.out.println("Found graph " + graphHopper.getGraphHopperStorage().toString() + ", nodes:" + graphHopper.getGraphHopperStorage().getNodes());
QueryResult queryResult = graphHopper.getLocationIndex().findClosest( 52.11111, 6.111111, EdgeFilter.ALL_EDGES);
double distance = queryResult.getQueryDistance();
System.out.println( "Shortest distance is: " + distance);
}
UPDATE: Using the JAR on Android may give a lot of compiler errors due to library version mismatchers. A better solution for getting this example run at Android, is using this dependency in your build.gradle:
implementation 'com.graphhopper:graphhopper-core:1.0-pre33'
Consequence is that you have to set the default routing profile. You can achieve via this change:
graphHopper = new GraphHopper().forMobile();
// Next line:
graphHopper.setProfiles( Collections.singletonList(new ProfileConfig("my_car").setVehicle("car").setWeighting("fastest")));
graphHopper.load(routingDataFolder);
I hope you enjoy this wonderful 'graphhopper' software!
Related
I'm trying to run this example about how to use Flask-Admin displaying maps: https://github.com/flask-admin/flask-admin/tree/master/examples/geo_alchemy.
In README.rst, there's this instruction:
You will notice that the maps are not rendered. To see them, you will have to register for a free account at Mapbox and set the MAPBOX_MAP_ID and MAPBOX_ACCESS_TOKEN config variables accordingly.
I already have a valid MAPBOX_ACCESS_TOKEN, and I went to MapBox to look for a MAPBOX_MAP_ID. There I read that MAP_ID was deprecated, and now I'll have to obtain a tileset ID, and it's described as a label composed by <my_mapbox_user_name>.the_tileset_ID itself.
So I located the code as they described in the instructions (in my case, mapbox-streets-v8) and fulfilled the config.py parameters:
MAPBOX_MAP_ID = '<my_mapbox_user_name>.mapbox-streets-v8'
MAPBOX_ACCESS_TOKEN = 'pk.eyJ1...'
However, I couldn't see any map displayed or any error message.
How can I fix it?
I think there is a small bug in file Lib\site-packages\flask_admin\static\admin\js\form.js. The original URL generated to get a tile is:
https://api.mapbox.com/styles/v1/mapbox/<MAPBOX_MAP_ID parameter>/tiles/12/2258/2457?access_token=<MAPBOX_ACCESS_TOKEN parameter>
However, the correct one is:
https://api.mapbox.com/styles/v1/<MAPBOX_MAP_ID parameter>/tiles/12/2258/2457?access_token=<MAPBOX_ACCESS_TOKEN parameter>
That is, I had to remove the mapbox word from the URL.
To do that I made some changes in form.js file:
//var mapboxUrl = 'https://api.mapbox.com/styles/v1/mapbox/'+window.MAPBOX_MAP_ID+'/tiles/{z}/{x}/{y}?access_token='+window.MAPBOX_ACCESS_TOKEN
var mapboxUrl = 'https://api.mapbox.com/styles/v1/'+window.MAPBOX_MAP_ID+'/tiles/{z}/{x}/{y}?access_token='+window.MAPBOX_ACCESS_TOKEN
Then, it's working now:
I have to display content from the owl file namely the class names.. onto my browser, I am using GWT,eclipse to do so, could some one tell me the following :-
1)how do I integrate the owl file with the eclipse project?
2)How do I run queries from my java project to extract class names from the owl file?
3)Where can I get the protege api to nclude into my project?!
You could just store your .owl file anywhere inside your project or on any other location on your harddrive. You just provide a path to it, when you load/store it (see code below).
Take a look at the OWLAPI, it allows you to load an existing ontology and retrieve all classes from it. Your code could look like this:
private static void loadAndPrintEntities() {
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
IRI documentIRI = IRI.create("file:///C:/folder/", "your_rontology.owl");
try {
OWLOntology ontology = manager.loadOntologyFromOntologyDocument(documentIRI);
//Prints all axioms, not just classes
ontology.axioms().forEach(a -> System.out.println(a));
} catch (OWLOntologyCreationException e) {
e.printStackTrace();
}
}
Rather than trying to integrate the Protegé API into your project, I suggest you write a plugin for Protegé. There are some great examples that should get you started. Import this project into Eclipse, modify the content, build your plugin and drop it into Protegé. That's it, you're ready to go!
As i am using folllowing code to load POI fro local
requestDataFromLocal: function requestDataFromLocalFn(lat, lon) {
var poisNearby = Helper.bringPlacesToUser(myJsonData, lat, lon);
World.loadPoisFromJsonData(poisNearby);
/*
For demo purpose they are relocated randomly around the user using a 'Helper'-function.
Comment out previous 2 lines and use the following line > instead < to use static values 1:1.
*/
//World.loadPoisFromJsonData(myJsonData); This line show only one POI
}
};
And I am also seeking help to reload POI from local
Use callCavaScript to pass information to JS environment and urlListener (document.location = "architectsdk://") to pass information to native code.
Have a look at these samples for more Information
Retrieving POI Data from Application Model
Native POI Detail Page
Best regards
I'm using Leaflet Routing Machine libraries for routes in my project and a Graphhopper server. When inspecting network in my browser the library always gets a response from the graphhopper server with a parameter "instructions" as true but i don't use instructions in my project, how can i disable it ?
Looking at the source code for the Graphhopper backend for Leaflet Routing Machine, I read this:
var computeInstructions =
/* Instructions are always needed,
since we do not have waypoint indices otherwise */
true,
...
return baseUrl + L.Util.getParamString(L.extend({
instructions: computeInstructions,
...
You might want to get a local copy of that code, change the value of the computeInstructions variable, and see if everything works as expected, or if everything (or at least waypoint display) breaks as #Liedman indicated in the source code comments.
i found out a solution, in my code; in the options of the L.Routing.Control object
i added :
router: L.Routing.graphHopper('', {
urlParameters : {
instructions : false
}
})
and it's working fine
My question is quite simple and with the SharpSvn Api, it should be easy as well. Here what I did:
path = "c:\project";
using (SvnLookClient client = new SvnLookClient())
{
SvnLookOrigin o = new SvnLookOrigin(path);
Collection<SvnChangedEventArgs> changeList;
client.GetChanged(o, out changeList); // <-- Exception
}
and when I call the GetChanged, I get an exception:
Can't open file 'c:\project\format': The system cannot find the file specified.
So, Maybe there is something I'm missing? Or maybe it's not the right way to do find out the list of files and folders that were modified in the local repository?
Thanks in advance.
The SvnLookClient class in SharpSvn is the equivalent to the 'svnlook' console application. It is a low level tool that enables repository hooks to look into specific transactions of a repository using direct file access.
You probably want to use the SvnClient class to look at a WorkingCopy and most likely its Status() or in some cases simpler GetStatus() function to see what changed.
The path that the SvnLookOrigin constructor wants is actually:
path = "c:\project\.svn\";
That is, it wants that special ".svn" directory not just the root of where the source is checked out to.
Although you probably do want to listen to Bert and do something like:
path = "c:\project";
using (SvnLookClient client = new SvnLookClient())
{
SvnLookOrigin o = new SvnLookOrigin(path);
Collection<SvnChangedEventArgs> changeList;
client.GetStatus(o, out changeList); // Should now return the differences between this working copy and the remote status.
}