Create a field with Strahler Order reversed

You may want to create a new field with the Strahler stream order reversed.  You can achieve this by creating a new field and running the VBA script which you can download from this page.

1. Run you river network through RivEX to build the Strahler stream order field. Determine the maximum Strahler order achieved by your network, you need this later.

2. Open the attribute table of your river network and from the Options button select "Add field. . ."

3. Add a new short integer field giving it a sensible name as shown below. In this example the new field is called RevStrahler.

4. Right click on the new field header in your attribute table and choose "Calculate values. . ." from the pop-up menu.  You may be asked if you want to run this calculation outside an edit session, say yes to this.

5. In the following dialog, tick the Advanced check box and then load the VBA script which you can download here. You must now edit the script by changing the maxStrahler variable from "?" to the maximum Strahler order of your network.  For example if your network achieves 6th Order then change "?" to 6 on the line "Let maxStrahler = ?"

6. Click on OK to calculate the reverse Stream order values.  Remember to clear any existing selection on your data before you run this script!

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