Assign and map values to a shapefile data structure

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Ryan Greenaway-McGrevy 2017-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/328242-assign-and-map-values-to-a-shapefile-data-structure

评论： Christoph Ullrich 2018-4-15

I have loaded in a shapefile and I want to:

(a) assign a numerical value to each polygon. These values are contained in a separate csv file. Both the csv file and the shapefile contain the same identifiers for the polygons. So this should be easy. (b) Map the numerical values. I do not care what the color scheme is, as long as larger values are distinguishable from smaller values in the color scheme.

I expect this is all straightforward, but I have been searching for the past hour but have come up with nothing. This seemed to be closest to what I am trying to do: https://www.mathworks.com/examples/mapping/mw/map-ex88555438-create-choropleth-map-of-population-density

Thanks in advance.

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Ryan Greenaway-McGrevy 2017-3-10

Thanks for the response. I would attach it, but these shp files are much bigger than 5MB. I have been looking for a smaller-sized file, but I am coming up with nothing.

Is it possible to take a sub-space of a shapefile in matlab? Perhaps by using 'boundingbox'? Then I could write it using shapewrite.