The Aggregate Points tool summarizes point features within designated areas. The tool calculates the total number of points within each bounding area, as well as any specified statistics for the points within the bounding areas. The resulting layer displays the count of points within each area using graduated symbols.
Spatial aggregation is one method for visualizing high-density data. For more information, as well as an overview of other methods, see Best practices for visualizing high-density data.
The output is a hosted feature layer and an optional hosted table layer.
A GIS analyst is studying whale populations in marine protected areas in Costa Rica. The analyst uses Aggregate Points to determine which protected area had the most whale sightings in the four-month study period.
Aggregate Points includes configurations for features to aggregate, summary areas, statistics, and a result layer.
Features to aggregate
The Features to aggregate group includes the following parameter:
- Input point features is the points that will be aggregated.
The Summary areas group includes the following parameters:
- Area type specifies the type of boundaries in which the features will be summarized. The boundaries can be an input polygon layer, square bins, or hexagon bins.
- Summary polygon layer identifies the input polygon layer in which the features will be summarized. This parameter is available when Polygon layer is specified for Area type.
Bin size is the size of the generated bins. For square bins, the value is equal to the height and width of the bins. For hexagon bins, the value determines the distance between parallel sides. This parameter is available when Square bins or Hexagon bins is specified for Area type.
- Bin size units are the distance units that will be used for generating the bins. Supported units are meters, kilometers, feet, yards, miles, and nautical miles.
Keep areas with no points determines which areas will be included in the result layer. If checked (default), all generated bins or input polygons will be returned, including those that do not overlap input points. If unchecked, bins or polygons with no summarized points will be removed from the output.
The Calculate statistics group includes the following parameters:
Field statistics determines which number fields from the input layer to summarize. Supported summary statistics include sum, minimum, maximum, mean, and standard deviation. The statistics are calculated for each boundary separately.Learn more about summary statistics
- Group by field is used to select a categorical field to create groups for statistical calculations. For example, when summarizing invasive plant species near a national park, the Group by field parameter can be used to calculate the statistics by species. When statistics are grouped by a field, the statistics are calculated for both the area as a whole and for each group.
- Include minority and majority values returns the group with the highest and lowest counts within each bounding area. This parameter is available when a field is chosen in Group by field.
- Include percentage of aggregated points specifies whether the percentage of points in the minority and majority groups will be calculated for each boundary and included in the output. This parameter is available when a field is provided for Group by field.
The Result layer group includes the following parameters:
- Output name determines the name of the layer that is created and added to the map. The name must be unique. If a layer with the same name already exists in your organization, the tool will fail and you will be prompted to use a different name.
- Save in folder specifies the name of a folder in My Content where the result will be saved.
The input must be a point layer. Lines and polygons cannot be aggregated within boundaries using the Aggregate Points tool. To aggregate lines and polygons within boundaries, use the Summarize Within tool.
Analysis environment settings are additional parameters that affect a tool's results. You can access the tool's analysis environment settings from the Environment settings parameter group.
This tool honors the following analysis environments:
This tool includes the following outputs:
- One polygon layer showing the summarized point layer. Depending on the tool configurations, the polygon layer will include fields with the following information:
- Count of points
- Summary statistic field (for example, Sum <field_name>). This field is included when a field is provided for Field statistics.
- <Group by field name>. This field is included when a field is provided for Group by field.
- Minority value. This field is included when Include minority and majority values is enabled.
- Majority value. This field is included when Include minority and majority values is enabled.
- Minority percent. This field is included when Include percentage of aggregated points is enabled.
- Majority percent. This field is included when Include percentage of aggregated points is enabled.
- Join ID
- Grid ID
- One table layer listing each feature and statistic by the Group by field value. The table output is only created if a field is provided for the Group by field parameter. Depending on the tool configurations, the table layer will include fields with the following information:
- Group by value
- Summary statistics
- Count of points
- Percent of point count
- Group by summary
This tool requires the following licensing and configurations:
- Creator or GIS Professional user type
- Publisher or Administrator role, or an equivalent custom role
Use the following resources to learn more: