Locations are measured in attributes using grids (int and float values)

Integer: discrete (land use cases)

Float: cont. (elevation)

• grids may have an associated attribute table
• unlike vectors, rasters use grids/matrices w/ cells, where as vectors use lines and coordinates/vertices

Methods of Grid Encoding

Point Based

• center point (regular grid) -DEMs, - but what if periodicity in landscape?; what if pop. density?
• systematic unaligned (random in a cell)

Area-based  (have to integrate info...)

• extreme value (max or min)
• total (sum, like reflected light)
• predominant type (most common)
• presence/absence (binary result)
• percent cover (% covered by single category)
• precedence of types (highest ranking)

Operations on Grids

Transformations: convert between different representations