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.
Table of Contents
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
|Summarizes values in a raster layer by zones in another layer.
|Assigns a value to each cell in the output layer based on unique combinations of values from several input layers.
|Automates the raster overlay process and lets you assign weights to each layer before adding.
|Overlays several rasters, multiplying each by their given weight and summing them together.
Vector Overlay Tools
|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.
|Features or portions of features which overlap in all layers or feature classes will be written to the output feature class.
|Features or portions of features in the input and update features that do not overlap will be written to the output feature class.
|Computes a geometric union of the input features. All features and their attributes will be written to the output feature class.
|The attributes and geometry of the input features are updated by the update features in the output feature class.