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I want to convert polygons into points. I know how it's done in ArcGis and I think this may sound trivial but it's a serious issue :/.

I'll appreciate any hints :)

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Do you mean convert the polygon borders into points or just reduce it to a point (get centroids)? –  R.K. Apr 30 '12 at 14:35
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4 Answers 4

up vote 12 down vote accepted

you can do this in qgis as :

Vector - Geometry Tools - Polygon Centroids

i hope it helps you...

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thanks! It did! –  Lukas Apr 30 '12 at 15:04
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and polygon to border nodes

Vector - Geometry Tools - Nodes extraction
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If you want to decide on your own point spacing, you can use the Sextante Toolbox with SAGA functionality activated (you'll need to install saga - www.saga-gis.org/ - and specify the installation path in sextante). Use the 'polygons to line' geoalgoritm followed by the 'line to points' one. You can create a model in sextante that combines these into one step as well.

Note: you have to make sure you install the right version of SAGA - I think its 2.0.8

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You could start here:

Feature To Point

import arcpy
from arcpy import env
env.workspace = "C:/data"
arcpy.FeatureToPoint_management("parcels.shp", "c:/data/output/parcels_center.shp", 
                            "CENTROID")

---OR---

Feature Vertices To Point

here:

import arcpy
from arcpy import env
env.workspace = "C:/data"
arcpy.FeatureVerticesToPoints_management("parcels.shp",
                                     "c:/output/output.gdb/parcels_corner", 
                                     "ALL")
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It should be noted that the arcgis "feature to point" tool has the 'inside' option, which forces the point to be created inside the polygon if the actual centroid falls outside the boundaries of the polygon: resources.arcgis.com/en/help/main/10.1/index.html#//… –  mapBaker Sep 20 '13 at 21:03
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