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GIS I - GROUP THREE (Quantitative Attribute Data (Manual or user defined,…

- - - - Pixels determine resolution
      - Each pixel must have a data input, no blanks allowed.
    - - Point ID (alpha numeric ID of closest point) ex. hospital
      - Line ID (alpha numeric ID of closest line) ex. road
      - Class code ( alpha numeric code for general class) ex. vegetation type
      - Table ID (numeric position in table) ex. row
      - Physical analog (numeric value representing surface value) ex elevation
      - Statistical value ( numeric value from a statistical function) ex. population density)
      - Contiguous region ID (alpha numeric ID for dominant region) ex. state
- - - - Overlay: An overlay operation combines the geometries and attributes of two feature layers to create the output.
      - Union
      - Intersection
      - Symmetrical difference (XOR)
      - Identity
    - - Eliminate:
        removes features that meet a user-defined query expression
      - Dissolve: aggregates features that have the same value for a specified attribute
      - Buffering: creates a new set of polygons from existing features
- - - - Lambert conformal Conic
      - mercator
    - - Albers Equal Area.
      - Sinusoidal
    - - Goodes Homolosine
      - Robinson
- - - - 2 options: 1 or 0 (output) based on attribute table values (input)
    - - Feature categories (output) based on attribute table values (input)
    - - Manually choose input and output values
    - - Specifies the number of output classes as having equal intervals based on a range of values
    - - Class boundaries place an equal proportion of a study area into a specified number of classes
    - - Classifies automatically based on gaps in clusters of data
- - - - Focus
      - order
      - balance
      - visual hierarchy: your plan on the order to introduce 3D effects or depth
    - - add Cartographic elements
        
        Scanning
        
        Captures data from hard copy
        
        Dependant on image quality and scanning resolution
        
        Consider scale and resolution when scanning so features don't "drop out"
        
        Digitizing
        
        By hand; By mouse using X and Y coordinates
        
        "Heads-up" Digitizing: Tracing features on a screen using a digital aerial image or satellite image as backdrop
        
        Error prone; requires editing and validation
      - manipulate till satisfied
      - organize
      - save template
      - Define shape
      - print and export in various formats
    - - Title
      - Legend
      - scale bar
      - neatline
      - North arrow and source statement
      - Source statement (acknowledgments of source of data projection)
  - - - Know intended audience
      - Know purpose of map
      - Know the meduim in which map will be presented: paper, digital, web, etc.
- - - - Shared nodes, lines, etc.
  - - - e.g. multiple polygons containing the same target line or nodes
- - - - Causes relief displacement
      - one of the largest sources of error
    - - one of the two largest sources or error
    - - could be large error especially with small format cameras
- - - - attribute accuracy
      - logical consistency
      - completeness
      - positional
        accuracy
- - - - neighborhood operations: incorporates date from input and other locations within proximity which then determines the values of the output
      - global operations: incorporates data from comprehensive input layer to ascertain every output value
      - local operations: incorporates only the data and a single input location which decides subsequent output
      - Spatial Data Operations*
- - - - intersection- data from both layers, but only from locations where data is contained for both layers
      - union- comprehensive data from bounding and data laters
      - clip - cookie cutter style overlay