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How can I Split A polygon and how can I merge serveral polygon

xiaoyunnsongb

Dear superiors:

Now I have a question to request ,please lost several minutes.

Q1: How can i split a polygon

now there is a polygon A,when i draw a line, then the polygon split to two (A1,A2).

pic one

pic two

Q2:How can i merge serveral polygon to one

now there is two or more than two polygons next (A1,A2) ,when I press Ctrl key ,then the polygons all be choiced ,how can I merge then to one(A)

like the picture up pic two ------> pic one

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Accepted answers

JoshHevenor

You'll need the geometryService:

geometryservice-amd | API Reference | ArcGIS API for JavaScript‌

This will get you geometries and you can update/create your features for saving as required. Here's how I've done this.

Split:

- Start with a selected polygon (know what you're splitting)

- Use the draw toolbar to get a line (onDrawEnd Event)

- I use the GeometryService->trimExtend to make sure the line will cut completely

- Use geometryService->cut([selectedPoly], newLine, ...) to get two new polys

- save the new polys (add two new and delete old, or whatever works for your data)

Merge

- Select multiple polygons

- geometryService->union([selectedPolys]) to get one poly

- save the new poly (delete the old, add new, etc).

I haven't touched on managing the attributes, but that shouldn't be bad once you have the geometries:

All comments

JoshHevenor

You'll need the geometryService:

geometryservice-amd | API Reference | ArcGIS API for JavaScript‌

This will get you geometries and you can update/create your features for saving as required. Here's how I've done this.

Split:

- Start with a selected polygon (know what you're splitting)

- Use the draw toolbar to get a line (onDrawEnd Event)

- I use the GeometryService->trimExtend to make sure the line will cut completely

- Use geometryService->cut([selectedPoly], newLine, ...) to get two new polys

- save the new polys (add two new and delete old, or whatever works for your data)

Merge

- Select multiple polygons

- geometryService->union([selectedPolys]) to get one poly

- save the new poly (delete the old, add new, etc).

I haven't touched on managing the attributes, but that shouldn't be bad once you have the geometries:

xiaoyunnsongb

Dear monyrothly：

Thanks very much. But I still not understand, Can you give the component in esri,

Wish you happy every day.

MonyrothLy

U can use the cut polygon tool

xiaoyunnsongb

Superiors：

My function is in javascript Of html ，not desktop， thanks very much。

xiaoyunnsongb

Dear Bart Smit：

Also thanks to you。

BartSmit

hhm, I'm afraid I spoke too soon. I can't find any code that has merge/split. All I can find is vertex/move/snap etc .. It might have been a geoprocessing service that offered that functionality. Or it might not have been esri stuff.. I can't recall the example. I'm sorry.

xiaoyunnsongb

Dear Mr Bart Smit:

Thanks very much.

Is it esri/dijit/editing/Editor? Yes in a layer, How can i split the polygon?

Best wishes

BartSmit

there should be a 'merge' option in the menu on your editor toolbar. Make sure you have only features selected from the same layer otherwise the merge will not work.

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