An orthomosaic map is a highly accurate, geometrically corrected image made by stitching together multiple aerial photographs (typically from drones, planes, or satellites). 

This allows the map to be used like a true map—you can measure distances, areas, and coordinates directly from it.

Key Features of an Orthomosaic Map:

• High-resolution: Much sharper than satellite imagery 
• Georeferenced: Each pixel has real-world coordinates.

 A Digital Surface Model (DSM) Or Vegetation Model is a type of representation of the Earth's surface that includes all objects on it. This means it captures:

• Natural features like trees, hills, and vegetation 
• Man-made structures like buildings, bridges, and towers 

Key Characteristics of a DSM:

• Represents elevations of the top surfaces (e.g., rooftops, tree canopies) 
• Generated from technologies like  photogrammetry or LIDAR.
• Often used in urban planning, telecommunications, and flood modeling