This document discusses raster and vector data models. It provides details on the raster data model including that it uses a grid structure with cells that can each hold a value. Features are represented by single cells for points, sequences of cells for lines, and collections of cells for areas. The document also discusses raster coding methods like presence/absence and dominant area, types of raster data like DEMs and DOQs, raster data structures including cell-by-cell and run length encoding, and the storage space versus resolution tradeoff of rasters.