Select by Attributes & Field Calculator
Автор: Digital Map Works
Загружено: 2024-09-19
Просмотров: 19
Описание:
Got it 👍 Let’s go step by step. Both Select by Attributes and the Field Calculator are powerful tools in ArcGIS (ArcMap and ArcGIS Pro).
🔹 1. Select by Attributes
This tool lets you select features in a layer using a SQL query.
How to use:
Right-click the layer → Selection → Select by Attributes.
Choose the layer and method (e.g., New selection, Add to selection).
Build an expression using the field names, operators, and values.
🔹 2. Field Calculator
Used to update or calculate values in an attribute field (numeric, text, date, etc.).
How to use:
Open the attribute table → right-click the field → Field Calculator.
Choose the Parser:
VB Script (older ArcMap)
Python (recommended in ArcMap & ArcGIS Pro)
Enter an expression.
Examples:
Text field:
🔹 Combine Both
Often, you use Select by Attributes first, then apply the Field Calculator only to the selected records.
👉 Example workflow:
Select by Attributes:
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