Other tools may be useful in solving similar but slightly different problems. Use Calculate Density to create a density map using point or line measurements. Therefore, Calculate Density also uses the Reclassify and Raster to Polygon geoprocessing tools to convert the raster to polygons before the results are displayed in Map Viewer Classic. The Kernel Density tool creates a raster output, whereas standard feature analysis tools create vector outputs. If the input features are lines, the distances will be measured using the planar method. If the input features are points, the distances will be measured using the geodesic method. Kernel Density uses a cell size equal to the default value, divided by four. How Calculate Density worksĭensity values are calculated using the algorithm from the Kernel Density tool in ArcGIS Pro. Square Miles (US Standard setting) or Square Kilometers (Metric setting).ĭensity can be calculated for point and line features only. Options include Square Miles and Square Kilometers. The units of the area used to calculate density. Used with the classification scheme in the Classify by option. The number of classes to be used in the result layer. Options include Equal Interval, Equal Area, Geometric Interval, Natural Breaks, and Standard Deviation.
The classification scheme used to display the resulting density layer. The density will be calculated and clipped to the boundaries of the area. These defaults can be changed using the Options drop-down menu.Ī distance (in miles, feet, kilometers, or meters) that is used to find input features within the same neighborhood as the focal feature.Īn appropriate search distance will be calculated using the locations of the input features.Īn area from a layer or the draw tool can be used to specify an area of interest. Features such as cities or highways could use a count field when calculating the density of population or lanes of traffic, respectively.īy default, the Calculate Density tool will calculate an appropriate search distance for determining neighborhood size, will not clip the output, will classify the output as Equal Interval with 10 classes, and will provide the output densities in Square Miles or Square Kilometers, depending on the Units setting in your profile. A count field is a numerical field that specifies the number of incidents at each location. The Calculate Density tool requires a single input of point or line features.ĭensity can optionally be calculated using a count field. As part of the analysis, the Calculate Density tool is used to compare the density of clean fountains and dirty fountains to determine whether the distribution of fountains is equitable. In particular, city officials want to determine whether public drinking fountains are distributed equitably across the city, meaning that the locations and conditions of the drinking fountains do not differ in areas of lower or higher socioeconomic status. The City of Berkeley, California, plans to promote healthier alternatives to sugary beverages such as tap water. Similarly, to have the density units of your output in miles per square mile, set the area units to Square miles.To run the Calculate Density tool, your portal's hosting server must be licensed with an ArcGIS Server Advanced license. To set the density to be in meters per square meter (instead of the default of kilometers per square kilometer), set the area units to Square meters. You can control the density units by manually selecting the appropriate factor. The end result, comparing an area scale factor of meters to kilometers, will be the density values being different by a multiplier of 1,000. For example, if the linear unit is meters, the output area units will default to Square kilometers and the resulting line density units will convert to kilometers per square kilometer. When an output Area units factor is specified, it converts the units of both length and area. How Kernel Density works-Help | ArcGIS Desktopīy default, a unit is selected based on the linear unit of the projection definition of the input polyline feature data or as otherwise specified in the output coordinate system environment setting.