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4 results for “from:Xin LIN”

How to remove polygons according to their attributes?
Xin LIN · Sep 5, 2008 · r-sig-geo

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How to calculate the area of polygons with holes?
Xin LIN · Mar 20, 2009 · r-sig-geo

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Is there any function to create buffer zones
Xin LIN · Jun 8, 2011 · r-sig-geo

Hi list, Is there any function to create buffer zones for polygons? For example, here I have polygon shapefile of a city. I want to create a buffer zone 1km outside its boundary, or a buffer zone with its area...

"Argument is of length 0" when extract values from a raster
Xin LIN · Mar 11, 2011 · r-sig-geo

Hi everyone, I am trying to extract values from a raster with various irregular polygons (say, boundaries of cities). I used the "extract" function in the "raster" package with the argument weights=T to account for the percentage of each...

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