Creating Subsets of Data in ArcGIS Pro
You will likely run into occasions when you have a large collection of features, but only want to map or perform analysis on a subset of those features, such as for a particular area.
The primary tool for isolating subsets of vector features is called a definition query. It is also possible to manually select features and isolate them on a separate layer.
This tutorial will cover some means of isolating subsets of data in ArcGIS Pro. The example data is electoral data by county from the Minn 2016 Electoral Counties feature service in the University of Illinois ArcGIS Online organization.
Subsets by Categorical Attributes
You can base a subset on a categorical variable, limiting display to just those features where that categorical variable is equal to a particular value.
For this example, we display only counties in Illinois.
Subsets by Quantitative Ranges
You can also create subsets based on quantitative variables.
For this example, we display only counties with a population greater tha 500,000.
Subsets by Partial Text Match
You can create subsets based on partial matches of names. This can be useful when names may contain additional text, such as directions (east, west) or unpredictable suffixes like "Road" vs. "Rd."
For this example, we display counties that have the word "Washington" in their name.
Subsets by Multiple Criteria
You can add additional clauses connected with the OR operator to match multiple criteria.
For this example, we display counties that have the word "Washington" or the word "Linconl" in their name.
Subsets by Drawing Selections
You can subset data by manually drawing selections and creating a new layer from that selection.
For this example, we display selected counties around Chicago, IL.