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Add How to Calculate a Field in ArcGIS Pro Using Python section.

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Nick Heppler 2024-12-11 15:25:13 -05:00
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@ -58,6 +58,43 @@ The following regions and their corresponding counties are predefined in the fun
- **New York City**: New York, Bronx, Queens, Kings, Richmond
- **Long Island**: Nassau, Suffolk
---
### How to Calculate a Field in ArcGIS Pro Using Python
To use the `get_region_by_county` function for calculating a field in **ArcGIS Pro**, follow these steps:
#### Step 1: Prepare Your Data
Make sure your dataset contains a field with county names. For this example, we'll assume there is a field called `County_Name` that contains the county name for each feature.
#### Step 2: Open the Field Calculator
1. In **ArcGIS Pro**, open your project and the relevant map or scene.
2. Right-click the layer that contains the data you want to update.
3. Click on **Attribute Table** to view the features.
4. Right-click the header of the field where you want to store the region names (e.g., `Region`).
5. Select **Field Calculator** to open the calculation dialog.
#### Step 3: Enter the Python Expression
In the **Field Calculator** dialog, do the following:
1. Ensure that the **Parser** is set to **Python**.
2. In the **Expression** box, type the following code:
```python
get_region_by_county(!County_Name!)
```
- The exclamation marks (`!County_Name!`) reference the `County_Name` field in your dataset.
- The function `get_region_by_county` will be applied to each row to calculate the corresponding region.
#### Step 4: Implement the Python Code
To ensure the function is available in the field calculator, follow these steps:
1. In the **Field Calculator**, click the **Show Code Block** checkbox.
2. In the **Pre-Logic Script Code** box, paste the function definition for `get_region_by_county`:
#### Step 5: Apply the Calculation
- Click **OK** in the **Field Calculator** to run the function. The `Region` field will be populated with the corresponding region for each feature based on the `County_Name` field.
---
### Installation
@ -75,3 +112,4 @@ The following regions and their corresponding counties are predefined in the fun
### License
This project is licensed under the GPL License - see the [LICENSE](LICENSE) file for details.