How to avoid road based on list of latitude & longitude

Open Source Routing Engine
1

I’m using the Android file for offline routing. Link

and I’m trying to make a condition to avoid certain road using list of latitude & longitude. This is like there’s a unexpected road blockage or accident.

Thank you in advance. I do I appreciate more if there’s a complete code to study. Sorry for being newbie.

2

See the custom weighting example or in the master branch we’ve developed a more integrated solution for that (currently limited to changes that you know up-front or single thread applications)

Sorry for being newbie.

No problem. You can find getting started material in the documentation and if something is unclear we should improve this docs.

3

Sorry sir, I really need help following the instruction.

I just follow to test the weighting. Please see the screenshot

screenshot.JPG827×470 39.3 KB

There are red in the code.

WeightingMap wMap,

String weighting = wMap.getWeighting();

I cant fix or make solution how it will be. Or i just missing something. The documentation is good, I just making a hard time doin it for the first time.

Another thing, am I doing it right declaring a GPS point

forbiddenEdges = 52.492999, 13.387924;

4

You can’t do this in Java :slight_smile: … create instances of GHPoint and then look them up using the LocationIndex (hopper.getLocationIndex), where you then get the edge IDs to be added to the forbiddenEdges.

5

Sorry sir, I can’t figure out how it will done. Is there any sample source code available to look on? My goal is just to have a offline routing that can set to avoid specific road (using gps point). Thank you in advance

6

Hi, I have a requirements like yours, which avoid road using latitude and longitude.
After looking a custom weight, it’s quite unclear about that. But I got this documentation
[Documentation - GraphHopper Directions API],

image
image994×187 10 KB

You can code like this

image
image972×155 3.62 KB

Hopefully help !!

Cheers,
Malvin
(Documentation - GraphHopper Directions API)

7

The recommended way is now via custom profiles where you can define polygons that you cannot only exclude but also avoid or prefer: Examples For Customizable Routing - GraphHopper Directions API

2 Likes
8

I’ve tried like this
image

GHRequest req = new GHRequest(originLatitude, originLongitude, destinationLatitude, destinationLongitude)
				.setAlgorithm(Parameters.Algorithms.DIJKSTRA_BI)
				.setProfile(vehicleProfile)
				.setLocale(Locale.ENGLISH);
		
		req.getHints().putObject("elevation", false);
		req.getHints().putObject("instructions", false);
		req.getHints().putObject("calc_points", generateRoutePath);
				
		if(blockedArea != null && !blockedArea.isEmpty()){
			GeometryFactory fact = new GeometryFactory();
			WKTReader reader = new WKTReader(fact);
			
			Map<String, JsonFeature> areasForbidden = new HashMap<>();
			CustomModel customModel = new CustomModel();

			try {				
				int index = 1;
				for(String area : blockedArea){
					Geometry polygonArea = reader.read(area);
					
					JsonFeature json = new JsonFeature();
					json.setGeometry(polygonArea);


					areasForbidden.put("forbiddenarea" + index, json);
					customModel.addToPriority(If("in_forbiddenarea"  + index, MULTIPLY, 0));
					
					index++;
				}
			
				customModel.setAreas(areasForbidden);
				req.setCustomModel(customModel);
			} catch (Exception e) {
				// do something
			}
			
			req.getHints().putObject(Parameters.CH.DISABLE, true);
		}

But I got this errors …
The requested profile ‘car’ cannot be used with custom_model, because it has weighting=fastest

What should I do ?

9

You should use “new CustomProfile” instead of “new Profile”

10

It’s works … thankyou …