What is overlay analysis? Discuss in detail different methods of overlay analysis.

Overlay analysis is a critical technique in Geographic Information System (GIS) used to evaluate spatial relationships between multiple layers of geographic data. It involves the combination of two or more spatial datasets (often in the form of raster or vector layers) to analyze how they relate to each other. By overlaying different layers, overlay analysis helps identify patterns, correlations, and trends in the spatial distribution of various features, facilitating decision-making processes in fields like urban planning, environmental management, and resource allocation.

The concept of overlay analysis relies on spatial intersection, where the geographic location and attributes of each layer are considered simultaneously. This allows users to investigate the relationships between features across different themes such as land use, elevation, soil type, water bodies, transportation networks, and more. The analysis results provide insights into how different spatial features interact, overlap, or influence one another.

### Types of Overlay Analysis

Overlay analysis methods vary depending on the data structure (raster or vector) and the type of problem being addressed. Broadly, overlay analysis can be categorized into two primary types: vector overlay and raster overlay.

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