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GIS I - GROUP C (Types of data represented by raster cell values (Point ID…

- - - - Hospital
  - - - Nearest road
  - - - State
  - - - Vegetation type
  - - - Row
  - - - Elevation
  - - - Population density
- - - - Point elevation data evenly spaced in an array
      - Easily converted to a raster data set
      - USGS seamless national elevation database
  - - - Connectivity
        
        Which lines connect to which
      - Adjacency
        
        Which polygons are next to which
      - Planar topology
        
        Planar Enforcement
        
        All features occur on a two-dimensional surface without overlaps
  - - - Delaunay triangles
- - - - Highways
  - - - Islands
  - - - Topography
- - - - 1.) Mixed Pixel Problem: Transition zones can be hard to classify because each cell can only be "owned" by one feature. There can be data lost in the raster model that would otherwise have been captured by the vector model.
        
        dominating characteristic
        
        the more important characteristic wins
        
        winner takes all
        
        characteristic with majority coverage wins
        
        edges separate
        
        mixed pixels become a boundry
      - 2.) Large areas of "No Data": Files can become bulky because large areas of unclassified data are often present
      - 3.) Vector ---> Raster exchange errors: Imposition of raster shape onto vector data can distort the original vector and create erroneous data. Each time conversion happens you are introducing error into the raster.
- - - - List of X & Y coordinates are listed, and their relationships are calculated on the fly. Topological relationships are not built in. Ubiquitous and now used by many types of GIS software. Does not have the ability to enforce topological relationships. .DBF file used
    - - All spatial entities are defined as objects. Objects can be given specific rules that all objects of that type must follow. Hierarchal relationships can be created (feature classes can be nested within feature datasets). Geometry and attributes are found in the same filetype, unlike the other data structures. This filetype is known as a BLOB (Binary Large Object).
        This file structure is native to ArcGIS
    - - Topology is explicitly built into the informational relationships of all of the polygons and their relationships are pre-defined. 1st native data structure.