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in ArcMap 10.0 I have one point shapefile (some adress layer with number of citizens) and one polygon shapefile (geomorphological segmentation). I need to add up citizens who live in certain area.

I can do select by location of course, but how can I automatically count all citizens from atribute in selected features (point) and add it to the polygon shapefile atribute to each polygon. Without manualy sumarizing fields from selected feature (there are plenty of polygons).

i would appreciate some hint on which tool should I use.

Thank you for your time and help.

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up vote 1 down vote accepted

If i understand your question correctly, you could do a spatial join: Join the polygon features to the point features. This should give each point information about which polygon it intersects with. Then you can use summarize with the field containing the info about the polygon and use "Sum" for statistics on the population field. Then you can join the resulting table from the summarize tool back to the polygons.

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Well I have done spatial join already so I know which point belongs to certain polygon. But I dont exactly follow on how you can fill atribute in polygon layer by sumarizing fields in point layer. – Jerry Mar 15 '13 at 8:44
Oh my bad. Now I see...I have to just join summarized spreadsheet to polygon layer by atribute. Thank you very much! – Jerry Mar 15 '13 at 8:49
sorry i din´t mention joining back the summarize results right away. glad i could help. – rafaelr Mar 15 '13 at 8:53

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