Using Filters to Symbolize and Filter Data on NRDS Web Application
For example create a map of last check dates
Here is a short video describing layer expressions
Here is a longer video with an example of building a map that shows last check dates
Using Layer Filters for Symbology on Custom Maps
Symbology Creation 0:14
Two methods to create symbology:
Using Symbology:
Symbolizes items based on options (e.g., active vs. deactivated).
Example: Active is green, deactivated is red.
Using Layer Filters:
Allows filtering based on options, dates, or numbers.
Examples of Layer Filters 0:45
Multiple expressions can display different scenarios on a map:
Example: Trap checks within different time frames:
Within 90 days
90 to 180 days
Greater than 180 days.
Types of Expressions 1:06
Two types of expressions for layer filters:
Expressions:
Based on survey questions.
Feature Expressions:
Use metadata (e.g., added by, added).
Example: Show features added by the current user.
Creating Expressions 1:43
How to create expressions:
Use survey questions to create expressions based on options.
Use templates, numbers, or date math.
Example: Show items last checked within the last 90 days.
6. Using the Help Feature 2:24
To learn how to create an expression:
Click the question mark icon for guidance.
Combining Expressions 2:33
Combine expressions using:
AND statements
OR statements
For complex expressions:
Copy and paste existing statements and modify them.