Convert java.lang.String geometry to jts Geometry

Question

I have a geometry in java.lang.String format. I mean i take it directly from DB in as a java.lang.String which is stored in a variable. I want to convert it to jts Geometry type somehow. Is there any way to do it or what i'm trying to do is just a foolish approach?

score 10 · Answer 1 · answered Jul 13 '16 at 06:30

10

I assume that your geometry has the WKT (Well Known Text) format. If not, you can get it in the WKT format by using the ST_AsText method (requires spatial DB, which I assume you are using).

A simple example of how to get a geometry from a WKT String:

String wktString = "LINESTRING (0 0, 0 10)";
WKTReader reader = new WKTReader();
Geometry geom = reader.read(wktString);

answered Jul 13 '16 at 06:30

Lars

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Thank you. Which jar file do I need to import just to use WKTReader ? to work around this problem I'm calling a store procedure in PostgreSQL / PostGIS. I'm working in Grails 4 and Java 8. Thank you in advance for any response. – Juan Salvador Aug 06 '19 at 21:29
`` org.locationtech.jts jts-core 1.16.1 `` – Lars Aug 07 '19 at 05:01

score 2 · Answer 2 · edited Sep 25 '12 at 14:49

You will have to first convert from String to Coordinates before you can convert it to a Geometry.

If the values are comma separated you could split them and create an array of Coordinates

String[] split=stringgeometry.split(",");
Coordinate[] coordinates = new Coordinate[split.length/2];
index = 0;  
for(int i=0;i<split.length;i+=2)
{
    coordinates[index]=new Coordinate(split[i], split[i+1]);
    index++;
}

After this you can create any Geometry that you want by using the GeometryFactory() class. For example to create a line string,

Geometry geometry = new GeometryFactory().createLineString(coordinates);

Is this what you want to do?

Convert java.lang.String geometry to jts Geometry

2 Answers2