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So that we can combine them with the bitwise-or operator and then separate them later. For instance, MODE_TRAINISH = MODE_TRAM | MODE_RAIL | MODE_SUBWAY | MODE_FUNICULAR | MODE_GONDOLA; If we later want to see if e.g. is included in the set, we can just do mode & MODE_TRAM and see if it's non-zero. In other words, we're representing a set of ...
GeoTools is a Java library which can read and write GeoJSON and provides access to features like area via the JTS library. It will also help you to reproject the geometries from the lat/lon of GeoJSON to a suitable projection for calculating areas in m^2.
You can do this several ways, I think that the easiest (if you only have a few GIS things to do) is to use Turf see here There are also a couple of GIS library whom are a bit heavier (size wise) leaflet: how to After you can also try openlayers3
Yoy need to specify the classpath. The error is saying that a class is not being found. Execute your file with the cp option: java -cp osm2po-core-5.0.0-signed.jar TestOSM
Ok, so I found by myself the solution thanks to @user30184 comment. The key principal is using JTS rotation via Math Transformation. //my base point Coordinate ancorPoint = placeCoordinate; //create orthogonal point in distance of 0.001 arc degrees Coordinate endingCoordinate = new Coordinate(placeCoordinate.x+0.001, placeCoordinate.y); //rotate by 90 ...
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