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Removing polygon holes in OpenLayers

JTS Polygon simplification without holesGeoserver : create a rasterized polygon / dynamic fill for polygons with features from databaseGeoserver and “inverting” a multiPolygon to dim the rest of a mapOpenLayers 3: Digitizing holes (donut polygons)St_delaunaytriangles polygon with holesAutomated way to create polygons from coloured mapgrid data to contoursFix slivers (Holes) between polygons ( generated after removing spikes)OGR multipolygon with holes modelHow to inverse the orientation of the holes coordinates of a polygon in geopandas

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5

I wrote some code for removal of polygon holes whose area value is under the hardcoded threshold.

source_g.getFeatures()[0].getGeometry().getPolygons().forEach(function(poly)

 if(!(poly.getLinearRings().length<=1)) 
 
 poly.getLinearRings().forEach(function(ring) 
 if(Math.abs(ring.getArea()) < 0.1) 

 ring.setCoordinates([])
 
 )
 ;
)

The idea is to set coordinates of inner LinearRings to [], I tried to do that on the whole feature and it disappeared. But for LinearRings it's not doing the same.

polygon openlayers holes

share|improve this question

edited Jul 4 at 10:52

Taras

3,29933 gold badges99 silver badges3232 bronze badges

asked Jul 4 at 9:49

GoranGoran

6966 bronze badges

add a comment | 

5

I wrote some code for removal of polygon holes whose area value is under the hardcoded threshold.

source_g.getFeatures()[0].getGeometry().getPolygons().forEach(function(poly)

 if(!(poly.getLinearRings().length<=1)) 
 
 poly.getLinearRings().forEach(function(ring) 
 if(Math.abs(ring.getArea()) < 0.1) 

 ring.setCoordinates([])
 
 )
 ;
)

The idea is to set coordinates of inner LinearRings to [], I tried to do that on the whole feature and it disappeared. But for LinearRings it's not doing the same.

polygon openlayers holes

share|improve this question

edited Jul 4 at 10:52

Taras

3,29933 gold badges99 silver badges3232 bronze badges

asked Jul 4 at 9:49

GoranGoran

6966 bronze badges

add a comment | 

I wrote some code for removal of polygon holes whose area value is under the hardcoded threshold.

source_g.getFeatures()[0].getGeometry().getPolygons().forEach(function(poly)

 if(!(poly.getLinearRings().length<=1)) 
 
 poly.getLinearRings().forEach(function(ring) 
 if(Math.abs(ring.getArea()) < 0.1) 

 ring.setCoordinates([])
 
 )
 ;
)

The idea is to set coordinates of inner LinearRings to [], I tried to do that on the whole feature and it disappeared. But for LinearRings it's not doing the same.

polygon openlayers holes

share|improve this question

edited Jul 4 at 10:52

Taras

3,29933 gold badges99 silver badges3232 bronze badges

asked Jul 4 at 9:49

GoranGoran

6966 bronze badges

source_g.getFeatures()[0].getGeometry().getPolygons().forEach(function(poly)

 if(!(poly.getLinearRings().length<=1)) 
 
 poly.getLinearRings().forEach(function(ring) 
 if(Math.abs(ring.getArea()) < 0.1) 

 ring.setCoordinates([])
 
 )
 ;
)

share|improve this question

edited Jul 4 at 10:52

Taras

3,29933 gold badges99 silver badges3232 bronze badges

asked Jul 4 at 9:49

GoranGoran

6966 bronze badges

share|improve this question

edited Jul 4 at 10:52

Taras

3,29933 gold badges99 silver badges3232 bronze badges

asked Jul 4 at 9:49

GoranGoran

6966 bronze badges

edited Jul 4 at 10:52

Taras

3,29933 gold badges99 silver badges3232 bronze badges

edited Jul 4 at 10:52

Taras

3,29933 gold badges99 silver badges3232 bronze badges

asked Jul 4 at 9:49

GoranGoran

6966 bronze badges

asked Jul 4 at 9:49

GoranGoran

6966 bronze badges

1 Answer
1

active

oldest

votes

7

The geometry is defined as an array of coordinates, not collections of Polygons and LinearRings, so what is returned by getPolygons() and getLinearRings() should be treated as clones and you will need to rebuild the geometry from coordinates

var geom = source_g.getFeatures()[0].getGeometry();
var geomCoords = [];
geom.getPolygons().forEach(function(poly)
 var polyCoords = [];
 poly.getLinearRings().forEach(function(ring, index) 
 if(index == 0 ;
 geomCoords.push(polyCoords);
);
geom.setCoordinates(geomCoords);

share|improve this answer

answered Jul 4 at 10:20

MikeMike

3,57311 gold badge33 silver badges1010 bronze badges

add a comment | 

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7

The geometry is defined as an array of coordinates, not collections of Polygons and LinearRings, so what is returned by getPolygons() and getLinearRings() should be treated as clones and you will need to rebuild the geometry from coordinates

var geom = source_g.getFeatures()[0].getGeometry();
var geomCoords = [];
geom.getPolygons().forEach(function(poly)
 var polyCoords = [];
 poly.getLinearRings().forEach(function(ring, index) 
 if(index == 0 ;
 geomCoords.push(polyCoords);
);
geom.setCoordinates(geomCoords);

share|improve this answer

answered Jul 4 at 10:20

MikeMike

3,57311 gold badge33 silver badges1010 bronze badges

add a comment | 

7

The geometry is defined as an array of coordinates, not collections of Polygons and LinearRings, so what is returned by getPolygons() and getLinearRings() should be treated as clones and you will need to rebuild the geometry from coordinates

var geom = source_g.getFeatures()[0].getGeometry();
var geomCoords = [];
geom.getPolygons().forEach(function(poly)
 var polyCoords = [];
 poly.getLinearRings().forEach(function(ring, index) 
 if(index == 0 ;
 geomCoords.push(polyCoords);
);
geom.setCoordinates(geomCoords);

share|improve this answer

answered Jul 4 at 10:20

MikeMike

3,57311 gold badge33 silver badges1010 bronze badges

add a comment | 

The geometry is defined as an array of coordinates, not collections of Polygons and LinearRings, so what is returned by getPolygons() and getLinearRings() should be treated as clones and you will need to rebuild the geometry from coordinates

var geom = source_g.getFeatures()[0].getGeometry();
var geomCoords = [];
geom.getPolygons().forEach(function(poly)
 var polyCoords = [];
 poly.getLinearRings().forEach(function(ring, index) 
 if(index == 0 ;
 geomCoords.push(polyCoords);
);
geom.setCoordinates(geomCoords);

share|improve this answer

answered Jul 4 at 10:20

MikeMike

3,57311 gold badge33 silver badges1010 bronze badges

var geom = source_g.getFeatures()[0].getGeometry();
var geomCoords = [];
geom.getPolygons().forEach(function(poly)
 var polyCoords = [];
 poly.getLinearRings().forEach(function(ring, index) 
 if(index == 0 ;
 geomCoords.push(polyCoords);
);
geom.setCoordinates(geomCoords);

share|improve this answer

answered Jul 4 at 10:20

MikeMike

3,57311 gold badge33 silver badges1010 bronze badges

answered Jul 4 at 10:20

MikeMike

3,57311 gold badge33 silver badges1010 bronze badges

answered Jul 4 at 10:20

MikeMike

3,57311 gold badge33 silver badges1010 bronze badges