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Area problems in Arcgis

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#1
bebe onea

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Hello.
I have a polygon shapefile which I derived in Arcgis by converting a raster with Raster to feature command.
Is there any possibility to find out the area of each feature in my shapefile and add it to the attribute table, because I want to make selections based on the area of the features?
Thank you.

#2
BioGeoMan

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Go to http://www.xtoolspro.com/ and download the free version. There is an area calculation tool that adds measurements directly to your attribute table, plus some other useful tools in GIS.

Michael Scisco

BioGeoCreations
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biogeocreations.com


#3
Unit Seven

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Also if you add the shp to a GeoDB (personal or file based) it adds a field area for you, and I think recalculates this if you edit the polygon.
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#4
bebe onea

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Go to <a href="http://www.xtoolspro.com/" target="_blank">http://www.xtoolspro.com/</a> and download the free version. There is an area calculation tool that adds measurements directly to your attribute table, plus some other useful tools in GIS.


Thank you for the replies.

#5
pfyfield

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Make sure your data are in an equal area projection (Albers e.g.) or the area calculation won't be worth much, and realize that the result will be in square units of whatever your projection unit is.
Seems to me there are scripts for this. Add a field, use the field calculator (you'll need to check the "advanced" box), then search the help for "field calculations" or something similar.
I do that all the time for stuff like calculating centroids and the like.
Paul Fyfield
Cartographer, Bureau of Land Management
Oregon State Office
Portland, Oregon
pfyfield@blm.gov

#6
Unit Seven

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Make sure your data are in an equal area projection (Albers e.g.) or the area calculation won't be worth much


A very good point—I had never though of this. I do do all my mapping of this type on a very localised national projection though.
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#7
paul

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Hello.
I have a polygon shapefile which I derived in Arcgis by converting a raster with Raster to feature command.
Is there any possibility to find out the area of each feature in my shapefile and add it to the attribute table, because I want to make selections based on the area of the features?
Thank you.


If you are using ArcGIS 9.2, you can use Calculate Geometry. No extensions or VB code needed.




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