net.motionintelligence.client.api.util

Class GeojsonUtil

java.lang.Object

net.motionintelligence.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 Summary

Modifier and Type	Method and Description
static void	openGeoJsonInBrowserWithGeojsonIO(Map<String,org.wololo.geojson.FeatureCollection> featureCollections) All filename-Feature pairs will be displayed in your default browser via the geojson.io website.
static void	openGeoJsonInBrowserWithGitHubGist(Map<String,org.wololo.geojson.FeatureCollection> featureCollections) All filename-Feature pairs will be displayed in your default browser via the api.github.com/gists website.
static List<org.wololo.geojson.Feature>	transformGeometry(org.opengis.referencing.operation.MathTransform transformer, org.wololo.geojson.Feature... featuresToTransform) Transforms geojson geometry between different formats.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

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(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:

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(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.util.Map<java.lang.String, org.wololo.geojson.FeatureCollection>).

Parameters:

featureCollections - map of fileNames and the respective contents (i.e. the FeatureCollection)

Throws:

IOException - if errors during parsing or execution occurred