How to randomly change the size and rotation angle of the "tree" symbol in ArcGIS 10

In 9.3.1, you can calculate a set of 0, 1, 2 random numbers in the properties table of the tree feature class to assign to each tree. Then, based on this random value, the "tree" is symbolized with graduated symbols, and the random size of the "tree" symbol is realized. To rotate each tree, you can use the same method to calculate a set of random numbers that represent the rotation angle, and then use rotation to implement the random rotation of the "tree" symbol.

　　

Here are the steps to achieve a random size, random rotation angle in ArcGIS 10, which is easier to do.

　　Randomly change the size of the "tree" symbol

First, symbolize the "tree". Then, use a random size for the tree symbol.

　　

"Tree" symbols of the same size and no rotation

1. Right-click on the "Tree" feature class in the table of contents.

2. click Properties;

3. On the symbology page, click the Advanced button and click "Size ...";

　　

4. Pop Up the Size dialog box and click on "Size Points by Value of this field" drop-down list, select options;

　　

5. In the Random Values section, set a minimum and maximum symbol size (these values are set mainly depending on the map scale);

　　

6. Finally, click OK continuously to see the effect.

　　

Symbolize "tree" with a random size of 10-50, but no rotation

　　Randomly rotate the "tree" symbol

After you set the random size of the tree symbol, the next step is to set the random rotation of the tree symbol to enhance realism. To do this:

1. Right-click on the "Tree" feature class in the table of contents.

2. click Properties;

3. On the symbology page, click the Advanced button and click on "Rotation ...";

　　

4. Pop-up Rotate dialog, click "Rotate Points by Anglein This field" drop-down list, select options;

　　

5. Set the rotation style to press "geographic" rotation;

6. Next, in the Rotation section, set a minimum and maximum rotation angle (by default the symbol is allowed to be rotated at any angle, which is more suitable for trees);

7. Finally, click OK continuously to see the results.

　　

"Tree" symbol with random size and random rotation angle

You now have symbols that are different in size and angle of rotation, so make your tree more realistic!

Using these techniques, the tree looks more realistic. You can also use the same technique to symbolize other features, for example, I symbolized the large stones in the ESRI campus.

　　

Original link:

http://blogs.esri.com/Support/blogs/mappingcenter/archive/2011/03/10/ Symbolizing-trees-in-arcgis-10-randomly-varying-the-tree-symbol-size-and-rotation-angle.aspx

How to randomly change the size and rotation angle of the "tree" symbol in ArcGIS 10