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- Open the DrainageLines attribute table.
- At the top of the DrainageLines attribute table, click the Add Field button.
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- For ‘Name:’, type “StrahlerOrder”.
- Use the ‘Type:’ drop-down menu to select Short Integer.
- Ensure your ‘Add Field’ window appears as shown below and click Save on top of the main tab.
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Scroll all the way to the right and notice the new StrahlerOrder field has been added to the end of the table. All of the values are currently null, but will later be populated with the Strahler Order integers from the OrderTable.
Joining tables
You are now ready to join the OrderTable to the DrainageLines layer based on their common identification fields.
- Click the Table Options button and select Joins and Relates > Add Join….
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- For ‘Input Join Field’, select the grid_code field.
- For ‘Join Table’, select the OrderTable table.
- For ‘Output Join Field’, select the VALUE field.
- Ensure that the ‘Join Data’ window appears as shown below and click Run.
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Scroll across the table and notice that most of the statistics (Min, Max, Mean, Majority, Minority, Median) are the same and all contain the Strahler order integer, so it doesn’t matter which field you copy, though you will choose the MIN field for this lab.
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