Scratching the Surface: Grid Data and Compression Routines
Raster Data Structures
USGS DEM Example: 1:250,000 San Jose West
DEM -> GRID Transformation
“The Kitness” at 75 dpi
“The Kitness” at 150 dpi
“The Kitness” at 300 dpi
“The Kitness” at 1200 dpi
Data Compression Techniques
Chain Codes
Run-length codes
The Linear Quad-Tree
The Linear Quad-Tree (1)
The Linear Quad-Tree (2)
The Linear Quad-Tree (3)
Morton Sequencing (1)
Morton Sequencing (2)
Morton Sequencing (3)
Limitations of Grid Data
Grids versus TINs
Grids (raster) may be converted to TINs (vector)
Email: pmessina@geosun.sjsu.edu
Home Page: http://geosun.sjsu.edu/paula/137/index.html