arcgis-desktopareabuffer
I have a park polygons layer and a set of points which I gave a 1000m buffer. For each of them I had calculated the area size with calculate geometry. So with which tool could I calculate the size of park within each buffer? I had tried intersect; it gives the results of the size of many parts of polygon under the buffer, I need to calculate the area size by myself. If I have 20 buffers could I get the sum of the polygons' size directly? I am using ArcGIS.
you should use the spatial join tool and select sum for statistics which are completely within source layer.
This can be accomplished with an Intersect, followed by a Field Calculate, and then finally a Summary Statistics. Make sure that your buffer feature class has a unique ID field.
Before getting started, you will need to add a field (name Polygon_Areas, type Double) to your population polygon feature class, and then field calculate it, using Shape_Area as the input. This will create a field with your areas that can be carried over in geoprocessing.
Now perform an intersect with your population polygons and your buffers as inputs.
A new feature class is created. Add a new field to it - maybe Area_Pop, type Double.
Field Calculate this new field in your intersect feature class:
Population field * (Shape_Area / Polygon_Areas)
Finally, you can perform a summary statistics on your intersect feature class. Use the Area_Pop as your statistics field and chose SUM as your type. Add the unique ID field for your buffer feature class as your Case field.
Voila. You can perform a Tabular Join from your new table back to your original buffer feature class and add the SUM_Area_Pop field to a new field with a field calculate.
Good luck!
Best Answer
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 yourIntersect, and proceed this with aDissolve, 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.