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Join Features

Join Features The Join Features tool transfers attributes from one layer or table to another based on spatial, temporal, and attribute relationships or some combination of the three. Optionally, statistics can be calculated for the joined features.

Analysis using GeoAnalytics Tools

Analysis using GeoAnalytics Tools is completed using distributed processing across multiple ArcGIS GeoAnalytics Server machines and cores. GeoAnalytics Tools and standard feature analysis tools in Portal for ArcGIS have different parameters and capabilities. To learn more about the standard tool Join Features, see join features. To learn more about the differences between the tools, see Feature analysis tool differences.

Workflow diagram

Join Features workflow diagram

Examples

An analyst has crime data throughout their city. To analyze and study the impact of these crimes, the analyst needs to understand the relationship that the crime locations have with the various city jurisdictions such as school districts, police beats, neighborhoods, and so on. By using the Join Features tool, additional information about each location can be appended to each crime, and the impact on various jurisdictions can be further studied and analyzed.

Tip:

If your portal is configured to use Living Atlas content, you can use the state and county Living Atlas layers, which include population data that can be joined to your crime data.

Usage notes

The Join Features tool is designed to transfer and append information from one layer to another. The information that is transferred is based on the type of spatial relationship defined, the temporal relationship defined, a common attribute that is shared between the two datasets, or some combination of the three.

When joining features, you can join features based on a spatial relationship, a temporal relationship, an attribute relationship, or a combination of the three.

OptionsDescription

Choose a spatial relationship Choose a spatial relationship

The spatial relationship that will determine if features are joined to each other. The available relationships depend on the geometry type (point, line, or area) of the layers being joined. Available spatial relationships are as follows:

  • Intersects
  • Equals
  • Near
  • Contains
  • Within
  • Touches
  • Crosses
  • Overlaps

Choose a temporal relationshipChoose a temporal relationship

The temporal relationship that will determine if features are joined to each other. The available relationships depend on the time type (instant or interval) of the layers being joined. Available temporal relationships are as follows:

  • Meets
  • Met by
  • Overlaps
  • Overlapped by
  • During
  • Contains
  • Equals
  • Finishes
  • Finished by
  • Starts
  • Started by
  • Intersects
  • Near

Choose the fields to match Choose the fields to match

The attribute relationship that will determine if features are joined to each other. Features are matched when the field values in the join layer are equal to field values in the target layer.

If multiple features match with the same target feature, you can determine if all the matching features will be joined (Join one to many) or if all the matching features will be summarized together (Join one to one) as follows:

  • Join one to one—This option summarizes all of the matching join features to each feature in the target layer. Only the features that have a match will be included in the summary and output. The count of joined features will be added in addition to other statistics such as sum, minimum, maximum, range, mean, variance, and standard deviation.
  • Join one to many—This option joins all the matching features in the join layer to the target layer. The result layer will contain multiple records of the target feature.

Examples of joining one to many and one to one
Examples of a one-to-many and one-to-one join. In this example, the one-to-one join only includes the count; additional statistics that can be calculated are shown below.

You can optionally build an expression to join features by. If you specify an expression, only features that meet the condition will be used. For example, you could only join target features from the field Magnitude if they were greater than the join feature with a field named Explosion using the following expression $target["Magnitude"] > $join["Explosion"]. Learn more about Arcade expressions with Join Features.

If Use current map extent is checked, only the features visible within the current map extent will be analyzed. If unchecked, all features in both the target layer and the join layer will be analyzed, even if they are outside the current map extent.

Limitations

Summary statistics will only be calculated if a Join one to one operation is specified.

How Join Features works

Calculations

Statistics are calculated for only those features that meet the specified spatial, temporal, or attribute relationship used in the Join one to one operation. You can calculate numeric and string statistics. By default, all statistics are calculated. Using the image above, numeric statistics were calculated on the Occupants field and string statistics were calculated on the Building_Name field for the values of Apartments for the Type field as shown in the following tables:

Numeric StatisticResults of Occupants of Type Apartment

Count

Count of:

[130, 8, 250] = 3

Sum

130 + 8 + 250 = 388

Minimum

Minimum of:

[130, 8, 250] = 8

Maximum

Maximum of:

[130, 8, 250] = 250

Average

388/3 = 129.333

Variance

= 14641.33

Standard Deviation

= 121.0014

String StatisticResults of Occupants of Type Apartment

Count

["Silverbirch Estates", "Pine Ridge", "Lake View"] = 3

Any

= "Pine Ridge"

Note:

The count statistic (for strings and numeric fields) counts the number of nonnull values. The count of [0, 1, 10, 5, null, 6] = 5. The count of [Primary, Primary, Secondary, null] = 3.

Similar tools

Use Join Features to transfer attributes from one layer or table to another based on spatial and attribute relationships.

Map Viewer analysis tools

Use the Aggregate Points tool to aggregate points into areas.

ArcGIS Desktop analysis tools

Join Features performs the functions of the Spatial Join, Add Join, and Summary Statistics tools.

You can run the GeoAnalytics Tools Join Features in ArcGIS Pro.