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6

Try "Select by Location" and set the trees as the Target layer. Set the buffer as the Source layer. Then, for the spatial selection method, use Are within the source layer feature or Are completely within the source layer feature. That should select all the points within the buffer. Now, you have three options: 1) In edit mode, open the 'Trees' ...


4

There is no way to define "outside only" in gBuffer. You have to go through the additional step of turning the inner polygon to null, and for a good reason. You can use the raster::erase function to remove the internal polygon. If you really want this as part of the gBuffer function why not just write your own modification of gBuffer that adds an "outside ...


2

Instead of a marker you can generate a buffer, setting each category (metro, tam and bus) to a numeric field (1000, 750 and 500). Then run the following queries: SELECT cartodb_id, ST_Transform( ST_Buffer(the_geom::geography, 1000)::geometry ,3857 ) AS the_geom_webmercator FROM table_name WHERE field_name ilike 'metro'; SELECT ...


1

The arcpy way of doing this would be (this method is for running two data sets at a time): After buffering each point layer, use Make Feature layer method on each point layer Define update cursor on the update layer Create a counter integer variable Within update cursor use select layer by attribute to select first update feature (FID or OID = 0 or ...


1

Points have no size, so any buffer is measured from the centroid of the point and symbol size has nothing to do with buffering. You can test this by creating a point and setting a small symbol and buffering by 5m, and then changing the symbol to something very very large and buffering again by 5m. When you measure the diameter of the buffer polygons you ...



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