Most efficient way to calculate acreage of a parcel?

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12-16-2019 08:40 AM
New Contributor III

Hello all. I am a little shy about asking this question because it exposes my lack of math/geometry knowledge and my inexperience with the array of tools in ArcMap. I am familiar with only a narrow set of them in the parcel fabric. Also, I use ArcMap 10.5.1.

Some context about my needs as a tax parcel cartographer: Many tax parcels are lots that have been formally platted out in subdivisions. The officially recorded plat has measurements and acreages. In a given section of land, some of the land may be platted out and some may not. The unplatted land is assumed to have measurements and acreages calculated from the remainder of a standard size section with the platted measurements and acreages taken out. We call those "balance parcels." Often, I find myself needing to verify the acreage of a balance parcel by gathering plats from the section, which have been filed at different times over decades and with different degrees of accuracy, and calculating for myself the balance of the section after totaling up the acreage of the platted parcels. This gets difficult because while I have line bearings, I don't feel confident in figuring out angles based on geographic bearings or in working with curves to figure this out by hand.

I am seeking a "shortcut" for the process of calculating balance acreage. Take the parcel below as an example: the lots around it have been platted, so I have data for the boundaries of this parcel, except for the western most line. Given the dimensions I do have, I should be able to calculate the length of that line. I also want to know the acreage of the selected parcel. What is the most efficient way to use ArcMap tools to do this?

2 Replies
New Contributor III

I'm not sure why this never had a response.  I would personally utilize the Parcel Fabric but if thats not something you know I would use the traverse tool, Pick an editable polygon layer as the template (if you dont have a "junk" polygon layer you may want to make one.  I used to use one all the time when playing with shapes) and then enter all the bearings and distances I know of.  The last line should be the unknown.  Just hit Finish and viola you have a polygon with the final line estimated by GIS. You can then look at your table and view the approx square feet there.  Is that what you were hoping for?

New Contributor III

Anne,

If you have a Standard or Advanced license, on ArcMap's COGO toolbar;

COGO Report manually measures the direction and distance of your line

COGO Area uses the COGO enabled feature's COGO dimensions to calculate the area, not the drawn dimensions

This may also be of help;

Hope this helps!!

Paul