• THE RASTER DATA MODEL •
There are millions of spatial databases in the geospatial technology universe. Most employ the raster data model for organizing data. There's lots of explanatory material out there. Here are some articles that we've found helpful:
- Representing the real world as data is found on Esri's ArcGIS Resources website. It does a nice job of explaining raster vs vector data representation.
Raster data is georeferenced by defining the location of one reference point - usually the center of the cell in the northwest corner of the grid. The geographic location of any other cell in the grid is determined by its displacement from the reference cell.
Database File Formats
The job of any database is to store a large amount of data so that it is both accessible and secure. Spatial databases have to deal with the added complexity of storing spatial information, while maintaining high levels of capacity, accessibility and security. New database designs are always being developed because there is continuing demand for data file designs that are larger, faster and more secure. Users need to be familiar with the many file formats used to organize and georeference raster data.