Point Density Tool, Density Toolset, Spatial Analyst Toolbox
Summary
Calculates a magnitude-per-unit area from point features that fall within a neighborhood around each cell.
Usage
Only the points that fall within the neighborhood are considered when calculating the density. If no points fall within the neighborhood at a particular cell, that cell is assigned NoData.
The values on the output raster will always be floating point.
The Output cell size parameter can be defined by a numeric value or obtained from an existing raster dataset. If the cell size hasn’t been explicitly specified as the parameter value, it is derived from the Cell Size environment if it has been specified. If the parameter cell size or the environment cell size have not been specified, but the Snap Raster environment has been set, the cell size of the snap raster is used. If nothing is specified, the cell size is calculated from the shorter of the width or height of the extent divided by 250 in which the extent is in the output coordinate system specified in the environment.
If the cell size is specified using a numeric value, the tool will use it directly for the output raster.
If the cell size is specified using a raster dataset, the parameter will show the path of the raster dataset instead of the cell size value. The cell size of that raster dataset will be used directly in the analysis, provided the spatial reference of the dataset is the same as the output spatial reference. If the spatial reference of the dataset is different than the output spatial reference, it will be projected based on the selected Cell Size Projection Method value.
Larger values of the radius parameter produce a more generalized density raster. Smaller values produce a raster that shows more detail.
For data formats that support Null values, such as file geodatabase feature classes, a Null value will be ignored when used as input.
If the area unit scale factor units are small, relative to the distance between the points, the output raster values may be small. To obtain larger values, use the area unit scale factor for larger units (for example, square kilometers versus square meters).
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