Package com.targomo.client.api.util

Class GeojsonUtil

java.lang.Object
com.targomo.client.api.util.GeojsonUtil
public class GeojsonUtil extends Object
Utils for geojson. Currently supported methods:
  • Transformation between geo formats
  • Visualization of Geojson data in browser

  • Method Details

    • transformGeometry

      public static List<org.wololo.geojson.Feature> transformGeometry(org.opengis.referencing.operation.MathTransform transformer, org.wololo.geojson.Feature... featuresToTransform) throws org.opengis.referencing.operation.TransformException
      Transforms geojson geometry between different formats. Usage example: 
       FeatureCollection featureCollectionIn3857 = ... //e.g. from the route service
 //Preparing transformer
 CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:3857"); //Web Mercartor
 CoordinateReferenceSystem targetCRS = CRS.decode("EPSG:4326"); //WGS84
 MathTransform transformer = CRS.findMathTransform(sourceCRS, targetCRS);
 //Do transformation from EPSG:3857 (Web Mercartor) to EPSG:4326 (WGS84)
 FeatureCollection featureCollectionIn4326 = new FeatureCollection(
     GeojsonUtil.transformGeometry(featureCollectionIn3857,transformer).toArray(new Feature[0]));
      Parameters:
      transformer - transformer initialized with the correct formats
      featuresToTransform - features that need to be transformed into the target format
      Returns:
      Zero or more transformed geometry features
      Throws:
      org.opengis.referencing.operation.TransformException - if the geographic projection transformation fails

    • openGeoJsonInBrowserWithGeojsonIO

      public static void openGeoJsonInBrowserWithGeojsonIO(String gitHubUser, String githubTokenForGistUpload, Map<String,org.wololo.geojson.FeatureCollection> featureCollections) throws IOException
      All filename-Feature pairs will be displayed in your default browser via the geojson.io website. Requires connection to the internet. (Only EPSG:4326 (WGS84) mode tested)
      Parameters:
      gitHubUser - valid github account id
      githubTokenForGistUpload - a token created for the user here: https://github.com/settings/tokens (must have gist creation scope)
      featureCollections - map of fileNames to their respective contents (i.e. the FeatureCollection)
      Throws:
      IOException - if errors during parsing or execution occurred

    • openGeoJsonInBrowserWithGitHubGist

      public static void openGeoJsonInBrowserWithGitHubGist(String gitHubUser, String githubTokenForGistUpload, Map<String,org.wololo.geojson.FeatureCollection> featureCollections) throws IOException
      All filename-Feature pairs will be displayed in your default browser via the api.github.com/gists website. Requires connection to the internet. (Only EPSG:4326 (WGS84) mode tested) Has sometimes display errors - esp. if multiple FeatureCollections are to be shown in one page. In that case it is suggested to use openGeoJsonInBrowserWithGeojsonIO(java.lang.String, java.lang.String, java.util.Map<java.lang.String, org.wololo.geojson.FeatureCollection>).
      Parameters:
      gitHubUser - valid github account id
      githubTokenForGistUpload - a token created for the user here: https://github.com/settings/tokens (must have gist creation scope)
      featureCollections - map of fileNames and the respective contents (i.e. the FeatureCollection)
      Throws:
      IOException - if errors during parsing or execution occurred