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QGIS 1.8.0. Scipy installed. Statsmodels installed. Using Sextante to try to calculate MCP.

When I run the MCP calculation from the Toolbox, a layer is added to the file, but the layer doesn't contain any information.

The input layer contains a set of points and the field I select from that layer contains OS grid references.

Does anyone have any ideas what I'm doing wrong? Any help much appreciated.

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If you just want to create a Minimum Convex Hull you could use the ftools Convex Hull function. You can find it under Vector -> Geoprocessing -> Convex Hull. –  Curlew Aug 14 '13 at 22:11
    
Thanks for the suggestion. Unfortunately I get the same result - a blank layer. What information do either of these tools need in the layer to create the polygon? –  user21074 Aug 15 '13 at 7:46

3 Answers 3

up vote 1 down vote

Been struggling all day trying to do MCP first with the old "R-related" method, before finding out about the Sextanta "AniMov", and finally installing QGIS 1.8 and the Sextante toolbox. Then had the same "invisible layer" issue. I solved this by discovering that the created MCP layer had no projection. Once I set it the same as the rest of my data, the MCP layer did indeed display correctly. Very simply fix, hope this was all your problem was too.

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You can also use R/Sextante on QGIS 2.0 to do that. Configure R on Processing ->Options and Configuration and make sure to install libraries "sp", "rgdal", "maptools" and "adehabitatHR". Then go to the toolbox, click on "Create a new R script" and paste the code below. The parameter "percentage" refers to the number of points you wish to include on the calculations.

##[Home range]=group
##Layer=vector
##Percentage=number 10
##Field=Field Layer
##Output=Output vector
library(adehabitatHR)
Output<-mcp(Layer[,Field],percent=Percentage)
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note that you need the python-rpy2 package to execute R-code through python. –  Curlew Oct 2 '13 at 8:17
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And if someone is struggling for days to find the AniMove functions as I was, one needs to active the plugin in Processing -> options & configuration -> Providers -> AniMove -> tick box behind activate.

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