I have a 6-acrea polygon, in ArcGIS 10, and would like to make 2 3-acre polygons
If you have a Parcel Fabric, this could be an option:
Creating new parcels using divide by area
By proportional area
Chris Donohue, GISP
Do you want to do it manually once or automate the process for many different polygons? I'm guessing the polygons are not symmetrical...
Wow, pretty fast response. No, I don't have so many that I need to automate the process. I can do it manually.
Sorry, nothing comes to mind immediately, did a little searching though. I'm curious, what is the purpose of splitting it 50/50 (not that it necessarily relates to answering your question and of course you don't have to explain if you don't want to - simply curious that's all)
Do you think this would work? Is that parcel data, and do you already use parcel fabric?
About dividing parcels by area in the parcel fabric
Maybe something here?
arcgis 10.0 - How to split a polygon into multiple equal-width polygons in ArcMap 10? - Geographic Information Systems S…
sorry, I didn't add text to that screen capture reply. Yes, you're correct the polys are not symmetrical; the splits may need to happen for just an unequal part of the poly. The selected poly in the screen capture is 6.00 acres. I need to manually split it into 2- 3.0 acre polys.
Thinking about your symmetrical response made me understand what you mean. besides doing a symmetrical split, could I set the approx part of the original poly to split, like specifying the north end where I want a 2 ac split out of the 6-ac poly I show in my screen capture?
If doing it for just one polygon, I might use the measure tool to measure 2 acres of the north side, and maybe create feature edit tool and snap to vertices and create vertices where needed - does that make sense? Then use the edit tool for Splitting a Polygon.
If it were something you had to automate then it could take much longer and more complex math and scripting as Ian suggested - it could be very simple or very complex depending on your situation and scalability needed.
For your question - it doesn't matter what shape the split off piece is? Just the acreage?
I've been trying a combination of the measure tool & create edit tool
w/ vertices depicted. Measurre tool snaps to the poly vertices, but does
not seem to offer more control on the size. I guess I don't understand
how you would use that combination to create an exact 2-ac chunk,
without a lot of trial and error.
Yes, I'm sorry but there may be trail and error with that method. I believe there is a way to add vertices along a line. (make the feature more complex) I will have to check on that though. I can recall one time I had to do this and it did take some trial and error. I needed to create an acre within a polygon.
Given the amount of work to achieve the task, I would assume there is be a better way to do it, but I don't know what that method would be. Maybe the parcel fabric as Chris and I suggested? Then it becomes a cost benefit analysis. Like almost any task - "what is the least cost path to achieve the goal? ASSUMING you're only going to do this once? or maybe once between now and the next software upgrade... or job.. etc. let us know what you find out in hindsight if it's valuable.
I may not be able to get back to this for some time next week though. Sorry I know that is not very helpful at the moment. maybe someone else will come up with a more elegant solution, I'll think about it some. If you should figure it out please let us know what worked best.
My team has enough of these split by acreage tasks that I should try
the parcel fabric method you fellows suggested. I've used it before.
You're right: are the amount of steps to set up the fabric for each one
of these polys a gain over just trial and error using your suggestions
of the meas and edit sketch tool? I wonder if there a precise, discreet,
way to add vertices on a line, like a distance, as we can with the cogo
functionality. I'm going to look at that, as well as try the parcel
fabric suggestion after work, today. I'll get back to you however it
works out. It was important for me to get your opinion to verify there
was not a really easier way to accomplish this. So, not having
something directly in mind is helpful to my team. I'm certainly grateful
for your prompt response.
Depending on the shape and dimensions, this could be a very easy or a difficult task. Could you give a little more detail about what you are wanting to do or possible give a screenshot of your polygon?
Ian, thanks for the prompt response and interest in helping me. I want to split the selected 6.00 ac poly into 2, each of exactly 3.0 acres. I don't have many to do, so I don't need to automate. I'm using an advanced level license.
I'm creating water rights maps for the Churchill County, Nv area.
I didn't think of using parcel editor. these polys are not in a
parcel fabric, but I'll try to use the parcel editor toolbar
Retrieving data ...