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1
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0answers
67 views
How to calculate weighted mean coordinates within polygons?
I'm using QGIS 1.8 on OSX 10.8.3.
I have a polygon shapefile of all of the US state legislative districts.
I also have a layer of points that are centroids of US Census Tracts, with a field for the ...
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0answers
34 views
Using random select FTools in QGIS
I wanted to ask about Random Select in Ftools for QGis, I have a polygon and wanted to randomly select within a specific subgrup of poligons that refers to an administrative boundary, but I haven´t be ...
2
votes
2answers
148 views
Couldn't load plugin fTools due an error when calling its classFactory() method
When I start qgis I get a python exception:
Couldn't load plugin fTools due an error when calling its classFactory() method
...
309, in _import
mod = _builtin_import(name, globals, locals, ...
1
vote
1answer
111 views
Why does ftools' difference tool fail?
I have an area polygon with rocks on it i want to use difference to map the soft (ground, not rocks) cover.
to do that i try using the (ftools) vector>geoprocessing>difference getting an empty ...
1
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0answers
25 views
Access to Attribute join via command
I have 1.8 Quantum GIS, the menu "attribute join from the FTOOLS" no appears in the screen , is there a way to access via command?.
thanks in advance
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0answers
105 views
Merging point shape file problems?
I've got a whole bunch of shape files that have soil testing data in them that I would like to merge together so I can do some analysis but when I use the Ftools merge shape files command I get an ...
3
votes
1answer
192 views
How to calculate buffer surface that falls within another layer's borders
The image below shows what two selected layers. One contains a series of borders, and the other a series of buffers.
I am trying to obtain the buffered surface within each of the borders in the ...
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0answers
22 views
Set buffer radius in metric units in qGIS [duplicate]
Possible Duplicate:
What is up with QGIS buffer tool units?
A similar question to this one has already been asked QGIS - Change unit of measure from degrees to meters, but none of the steps ...
2
votes
1answer
1k views
How to find polygons centroids? [duplicate]
Possible Duplicate:
Get list of coordinates for points in a layer?
Sorry for another basic question - my map is almost done but now my boss wants me to enter new outbreaks (that we don't ...
