Posted on February 12, 2023 (Updated on July 10, 2025)

Unique and Range value symbology in Arc Desktop 10.1

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What are unique values in ArcGIS symbology?

Unique values symbolize qualitative categories of values. Examples include habitat types, planning zones, voting preferences, and soil classifications. Unique value symbology can be based on one or more attribute fields in the dataset, or you can write an Arcade expression to generate values on which to symbolize.

How do I create a unique value map in ArcMap?

Create a unique values map

  1. Expand a dataset in the data pane so that the fields are visible.
  2. Select a string field . Tip:
  3. Drag the field to the page and drop it on the Map drop zone. A unique values map will be created using Types (Unique symbols) as the Symbol type.


How do I find unique values in ArcGIS Pro?

How To: Identify duplicate or unique values in ArcGIS Pro

  1. Using the Find Identical tool.
  2. Using the Calculate Field function.
  3. Using a stand-alone Python script.
  4. Using the Summary Statistics tool, and joining the table.

 

What are Z values in ArcGIS?

The z-value field is a property of a feature class that is enabled when a feature class is initially created. Z-values provide the ability to model and analyze point, polyline, and polygon features in three-dimensional (3D) space.

What are unique values?

Unique values are the items that appear in a dataset only once. Distinct values are all different items in a list, i.e. unique values and 1st occurrences of duplicate values.

How do you make a value unique?

In Excel, there are several ways to filter for unique values—or remove duplicate values:

  1. To filter for unique values, click Data > Sort & Filter > Advanced.
  2. To remove duplicate values, click Data > Data Tools > Remove Duplicates.

How do you make an array value unique?

Input: A[] = [1, 2, 2] Output: 1 Explanation: After 1 move [2 -> 3], the array could be [1, 2, 3]. A simple solution to make each duplicate value unique is to keep incrementing it repeatedly until it is not unique.
 

How do I create a unique ID in ArcGIS?

Procedure

  1. In ArcGIS Pro, search for the Data Management tool Create Database Sequence.
  2. In the Create Database Sequence geoprocessing tool, select the desired Enterprise Database in the Input Workspace, provide a name for the Sequence Name, a number for the Sequence Start ID, and the Sequence Increment Value.

 

How do I select multiple unique values in ArcMap?

How To: Select multiple values using the Select By Attributes…

  1. In ArcMap, open the attribute table of the layer.
  2. Click the Table Options button. > Select By Attributes.
  3. Double-click the field that contains the desired values.
  4. Add a space after the field name and type IN.
  5. Select the parentheses icon.

 

What is a unique identifier in GIS?

Unique ID is a tool that generates custom IDs and GIS features designed to work seamlessly with your GIS database and is built to seamlessly integrate with Cityworks software. Your GIS is now customized to match your workflows and processes.
 

What does the unique () function do?

The UNIQUE function returns a list of unique values in a list or range.

What is unique array value?

The unique() function is used to find the unique elements of an array. Returns the sorted unique elements of an array. There are three optional outputs in addition to the unique elements: the indices of the input array that give the unique values.