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You can use the Group Stats plugin which you may need to download and install from the toolbar: Plugins > Manage and Install Plugins. I used it for a simple layer populated with some basic data: Below is the interface of the Group Stats plugin which calculates the sum of the Area column. It only sums those features which contains a value of 100 for the ...


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When you are running an update, there is no need for a subquery with a SELECT. This is the cause of the more than one row returned by subquery used as an expression error, as the SELECT will return multiple rows. Instead, you want: UPDATE table_name SET shape_area = ST_Area(the_geom::geography)*0.00024711; which will update your table on a row by ...


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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 ...


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If I understand you correctly I think you are looking for the clip tool. in ArcGIS 10 and above it should be in geoprocessing → clip (or in toolbox Toolboxes\System Toolboxes\Analysis Tools.tbx\Extract\Clip) your input would be the parks and the clip feature would be the buffer. this will create a new feature class that is only the parts of the parks that ...



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