topic Exact specified acreage area of a polygon. in Spatial Data Science Questions

Exact specified acreage area of a polygon.

PhilCornish — Wed, 09 Mar 2016 23:22:27 GMT

Hi everyone, I'm in ArcMap 10.3 and trying to make a polygon have a specified acreage area. Currently it is 181.3061 acres and I would like it to be exactly 180. Is there a way to do this (and I don't mean just by reducing the number of decimal places!)? If so, can I specify which vertex I'd like to the software to use to cause the area to grow or shrink?

Thanks!

Re: Exact specified acreage area of a polygon.

StevenGraf1 — Wed, 09 Mar 2016 23:43:25 GMT

Does it need to be a specific shape? If not, just use feet instead. Convert your 180 acres to Sq Ft. When editing, you can right click the map and an option is to specify a length when drawing a polygon.

180 Acres = 7,840,800 Sq Ft.

A polygon could be 2700 ft x 2904 ft

-Steven

Re: Exact specified acreage area of a polygon.

DarrenWiens2 — Wed, 09 Mar 2016 23:52:57 GMT

If I understand correctly, you have an irregularly shaped polygon (i.e. not necessarily a rectangle or circle) and want to constrain it to an exact size. The short answer is: no, there is no such tool to do this, that I know about.

However, you may be able to script it, although it would be somewhat complicated. Given the vertex and a bearing to move it on, you could automate moving a single vertex and testing the resulting area, through trial and error (although, even then, you may not be able to do exactly what you want - think of an S-shaped polygon).

Re: Exact specified acreage area of a polygon.

PhilCornish — Wed, 09 Mar 2016 23:57:14 GMT

Thanks to both of you. Darren, you had it right. It is a weirdly shaped polygon and I wanted to pick a vertex to specify where the adjustment could be made to affect the exact area. I had seen the coding info for something like that but it scared me off. Knowing there is no easier tool for this helps. Thanks!

Re: Exact specified acreage area of a polygon.

DanPatterson_Retired — Thu, 10 Mar 2016 00:24:05 GMT

it would be easier to code an incremental buffer until you get the right area... but it will probably be trial and error.

you could give this a shot as well http://www.arcgis.com/home/item.html?id=10b2645c4fcd4daf97100720d417424c from arcscripts 2.0 (beta)