Overlay Analysis ArcGIS
Overlay analysis is a technique for applying a common scale of values to diverse and dissimilar inputs to create an integrated analysis.
There are two methods for performing overlay analysis:
- Feature overlay– represents points, lines, and polygons.
- Raster overlay– represents each cell of each layer references the same geographic location.
The Overlay toolset contains tools to overlay multiple Feature classes.
Raster Overlay Tools
|Zonal Statistics||Summarizes values in a raster layer by zones in another layer.|
|Combine||Assigns a value to each cell in the output layer based on unique combinations of values from several input layers.|
|Weighted Overlay||Automates the raster overlay process and lets you assign weights to each layer before adding.|
|Weighted Sum||Overlays several rasters, multiplying each by their given weight and summing them together.|
Vector Overlay Tools
|Identity||Computes a geometric intersection of the input features and identity features. The input features or portions of that overlap identity features will get the attributes of those identity features.|
|Intersect||Features or portions of features which overlap in all layers or feature classes will be written to the output feature class.|
|Symmetrical difference||Features or portions of features in the input and update features that do not overlap will be written to the output feature class.|
|Union||Computes a geometric union of the input features. All features and their attributes will be written to the output feature class.|
|Update||The attributes and geometry of the input features are updated by the update features in the output feature class.|