ArcMap gets the outsourced polygons for features

There is often a need for users to have a bunch of discrete points on hand to get the area covered by this heap of points, that is, the outsourced envelope. Look at the test data, such as:

1, if you want to get the convex of the outsourcing network

So in ArcMap there is a toolbox tool called "Minimum boundary Geometry", which calculates the convex outsourced envelope, as follows:

Where parameter selection convex_hull is to generate minimum convex

The effect is as follows:

2. What if we want a concave surface that fits the outer edge point?

1) First Use "Create tin" in 3D analysis to connect these points to a tin

The effect is as follows:

2) Use "Paint tin data Area"

It is important to note that any one edge of the triangle, if it is greater than the "maximum edge length", then the triangle will be erased, we measured an edge of the triangle, about 80 meters, trying to set the minimum edge length of slightly greater than 80 100, the purpose is to avoid the interior should not erase the triangle also erased In the other method, select "Perimeter_only", perimeter_only will traverse the triangles from the outer range of the TIN, and if the edges of the bounding triangle are smaller than the maximum edge length in the current iteration, the traversal will stop. All will classify the entire TIN triangle collection by the length of the edge. In short, this parameter determines whether to erase the edges of the triangle and whether or not to judge the internal triangle.

If you find extra triangles that are not erased at the edges, you can set the minimum side length and then make it smaller

After the final setting of 60, the effect is as follows:

3) Use the Tin Range tool to export the tin boundary as a polygon or a line

Effect

——————————————————————————————————————

The processing of line features is exactly the same as in the case of common contours, such as:

Mr. Cheng Tin

To paint a tin and remove the extra triangular pieces.

Then export the envelope polygon

Reprinted from http://blog.csdn.net/esricd/article/details/7788065

ArcMap gets the outsourced polygons for features