Linked Questions

3
votes
3answers
481 views

Merging island into simplified polygon [duplicate]

I have a polygon shapefile with holes (representing Islands and Rivers) within it as seen below: I need an automated way to fill the polygon in QGIS as seen below: That is remove all Islands and ...
3
votes
2answers
378 views

Simplify polygon QGIS [duplicate]

I have a layer of polygons that are pretty detailed. I need these to be more simple. Is there a way to make this into a polygon with just the outer boundries?
-1
votes
2answers
154 views

Using Grass to slightly smooth a polygon [duplicate]

I have a geojson file with a lot of features. Many of them look like that: What I'd like to get is a shape that very much resembles this one but is smoothed a little bit. Ideally, it would look ...
2
votes
1answer
150 views

Smoothing polygons in QGIS? [duplicate]

I vectorised an image and all my polygons have extremely jagged edges. What is the best way to smooth these polygons?
2
votes
0answers
95 views

Smoothing out polygons without gaps? [duplicate]

I'm converting a raster data to vector data. The problem is similar to this: How to smooth large vector polygons from Raster But what I need to know is how can I handle out the gaps that are formed ...
3
votes
1answer
2k views

How to get smooth contours from points or IDW raster in QGIS

Hello I'm an artist trying different ways of drawing contours in QGIS using points with income values. I've been able to import a shp file with the data, create a layer with centroids of the census ...
2
votes
2answers
326 views

Is there a programatic method to simplify a polygon? [closed]

I have an array, containing lat/lon coordinates which form a polygon(the boundaries of certain cities on the map). I got this data from OpenStreetMap's database, and my problem is what follows: ...
0
votes
2answers
623 views

Adding polygons with excessively complex coordinates to Google Maps

I have a big JSON file, from a converted shp file (through http://mapshaper.org/) of region coordinates for Australian Local Government areas. The problem is that the region areas are super complex ...
3
votes
1answer
147 views

Reducing the accuracy of coordinate data

Let's say that I have a large set of latitude, longitude pairs which are accurate to 5 meters. I want to reduce their accuracy to 100 meters so that they render quicker and consume less storage space. ...
2
votes
0answers
119 views

C/C++ function to return minimum set of points required to represent a geometric shape

I am looking for a method from Grass, GEOS, or similar that will delete those points in a geometry which do not affect its shape. Example 1 +----+----+ p0 p1 p2 p1 can be deleted without ...
1
vote
1answer
51 views

Connect outline gaps at vector shape

Could someone shed some light into a method to link breaking outline borders without much distortion from the original like e.g. convex hull does? Convex hull alternative ideas are of course welcome ...