Thanks! I did that previously, though, and it calculated the area for each individual polygon. How about for selected ploygons?Open the layer's attribute table. If there isn't one already, add a field. Use the double field type as you will be including a decimal. Run the Field Calculator to compute the acreage.
I'm still at 9.3, but there should be something similar in 10. Right click on the area field you created, and click "Statistics". The little popup window should have what you're looking for. Alternately, click "Summarize" to output similar info as a table or text file.Thanks! I did that previously, though, and it calculated the area for each individual polygon. How about for selected ploygons?
I would do the same in Excel. You don't have to merge polygons (or export select features as a new shapefile). I am pretty sure there would is some SQL expression that can total all of the values (or values of selected features) and add that value into a new cell in a new column.Personally I just get the values of the selected polygons into Excel and AutoSum them. I'm honestly not sure how else you can do that in Arc without merging polygons.
You can use the Select by Attributes wizard to define which area size to select, i.e. "Select from SOIL where AREA <50". Or, you can select the features you want manually, either in an attribute table or by clicking on the polygon itself.Hello i was wondering if anyone can suggest a way to select an area within an existing polygon based on a particular area size?
E.g. Say for example i have a large soils polygon of 100 hectares and i wanted to select only 50 hectares within that polygon and use that to create a layer, how would i acheive this?
Cheers any help would be appreciated