Points contained in envelopes that cross date-line - java

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04-20-2015 04:57 PM
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New Contributor III

I'm using the ESRI Geometry Java API https://github.com/Esri/geometry-api-java

I want to construct an envelope and see if it contains certain points. It's possible the envelope crosses the International date line.

Here is some sample code I've tried:

    double lon = Double.parseDouble("179.99"); 
    double lat = Double.parseDouble("0");
    Point pt = new Point(lon, lat);
    double minlon = Double.parseDouble("170");
    double minlat = Double.parseDouble("-20");
    double maxlon = Double.parseDouble("-170");
    double maxlat = Double.parseDouble("20");
    Envelope ev = new Envelope(minlon, minlat, maxlon, maxlat);
    SpatialReference sr = SpatialReference.create(4326); // decimal degrees    
    boolean test = GeometryEngine.contains(ev, pt, sr);
    System.out.println(GeometryEngine.geometryToJson(sr, ev));
    assertTrue
("envelope containts point true", test);

The test fails, and if I check the print statement I get a json that has swapped my x-coordinates

    {"xmin":-170,"ymin":-20,"xmax":170,"ymax":20,"spatialReference":{"wkid":4326}}

Is there a different/better way to do this?

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New Contributor III

Here is the solution I found: don't use the ESRI library, use Spatial4j instead.

Example use:

Add to your pom:

<dependency>
<groupId>com.spatial4j</groupId>
<artifactId>spatial4j</artifactId>
<version>0.4.1</version>
</dependency>

in your class:

Rectangle envelope = SpatialContext.GEO.makeRectangle(minlon, maxlon, minlat, maxlat);

Point pt = SpatialContext.GEO.makePoint(lon, lat);

boolean contains = false;

if (envelope.relate(pt) == SpatialRelation.CONTAINS) {

  contains = true;

}

you can also check if your envelope crosses the dateline with this boolean response:

envelope .getCrossesDateLine();

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Highlighted
New Contributor III

Here is the solution I found: don't use the ESRI library, use Spatial4j instead.

Example use:

Add to your pom:

<dependency>
<groupId>com.spatial4j</groupId>
<artifactId>spatial4j</artifactId>
<version>0.4.1</version>
</dependency>

in your class:

Rectangle envelope = SpatialContext.GEO.makeRectangle(minlon, maxlon, minlat, maxlat);

Point pt = SpatialContext.GEO.makePoint(lon, lat);

boolean contains = false;

if (envelope.relate(pt) == SpatialRelation.CONTAINS) {

  contains = true;

}

you can also check if your envelope crosses the dateline with this boolean response:

envelope .getCrossesDateLine();

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