I've created buffers around home origins and am looking to calculate the sum of shapefiles (in this case crime) within each buffer. How would I go about doing this? I want to know how many crimes are within each buffer. Thanks!
[GIS] Calculate sum of points within buffer (ArcMap)
arcgis-10.1arcgis-desktopbuffer
Related Solutions
If you're using ArcGIS 10, you can do it without Editor or Info by creating the buffer as a different layer, then doing a Union (Analysis->Overlay) on the initial layer and the buffer. This should create additional fields in the dataset, for instance if the unique field is "Name", then there should be a field "Name_1". In other words the union is basically joins the structure of both layers together.
You can then filter out all shapes where "Name" is nothing (Deifinition Query = "Name"<>'') [two single quote marks after <>] which should leave you with just the initial shapes, split by the buffers.
You can then calculate the area of each of these objects into a new field and do a spatial join on the buffer layer counting the sum of the area of the filtered Union Layer.
Hopefully this graphic illustrates this visually.
There are a couple ways to accomplish this task. The first is the Summary Statistics, as I explained in your other question. A second way to do this is to first perform your Intersect, and proceed this with a Dissolve, with the buffer unique ID field as your Dissolve field.
This creates a new feature class with each feature representing all buffer-areas-within-parks.
Best Answer
you should use the spatial join tool and select sum for statistics which are completely within source layer.