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I have few polygons and I want to create few scattered well distributed point within the polygon. I am used to with ArcGIS and QGIS platform. How can I make it?

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3 Answers

In QGIS there are two tools you could use, you can find them both in Vector -> Research Tools. One will create a random set of points in a polygon, the other will create a regular grid. It sounds like the Regular Points tool will get you what you need.

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There are two really easy methods to accomplish this using ArcGIS:

  1. Create random points within your polygon using Create Random Points (Data Management)
  2. Creating a regular grid of points within your polygon

Method one is fairly straight forward. Method two requires a few steps:

  1. Use Polygon to Raster making sure your grid is to whatever pixel size suits your analysis. In this example, I used 100m.
  2. Convert Raster to Points to generate a regular grid within your original polygon

enter image description here

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It should be noted that Create Random Points and Polygon to Raster tools are only available in ArcGIS Advanced or with either the Spatial Analyst or 3D Analyst Extensions. –  Fezter May 21 '13 at 23:43
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Alternative (Basic license) to Polygon To Raster then Raster To Point is Create Fishnet then Clip. –  PolyGeo May 22 '13 at 12:09
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Another good option is the free software, Geospatial Modelling Environment (Formerly Hawth's Tools). Among the large number of vector/raster/analysis tools it contains, there are a number of tools for sampling design including generating points within a polygon.

There is a tool which will generate regular points within polygons and you can even specify an angle of rotation if you want the points to align with something other than East-West/North-South. There is also a tool which will generate random points within a polygon.

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+1 For GME. Keep in mind that GME has ArcGIS and R dependencies. –  Aaron May 22 '13 at 2:41
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