Transcript An Analytic Framework for GIS Modeling

An Analytic Framework for GIS Modeling
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An Analytic Framework for GIS Modeling
A Grid Map consists of a matrix of numbers with a
value indicating the characteristic /condition at each
grid cell location forming a geo-registered set of Map
Map Stack
Layers or “Map Stack”
Lines
Layer Mesh
Grid Map
Fill
Analysis Frame
The Analysis Frame
provides consistent
“parceling” needed
for map analysis
and extends discrete
point, line and areal
features to continuous
Map Surfaces
Col 3, Row 22
Layer Mesh
Data listing for a
Map Stack
Drill-down
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An Analytic Framework for GIS Modeling
Reclassify operations involve reassigning
map values to reflect new information
about existing map features.
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An Analytic Framework for GIS Modeling
Overlay operations involve characterizing
the spatial coincidence of mapped data.
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An Analytic Framework for GIS Modeling
Proximity operations involve measuring
distance and connectivity among map
locations.
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An Analytic Framework for GIS Modeling
Neighborhood operations involve
characterizing mapped data within the
vicinity of map locations.
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An Analytic Framework for GIS Modeling
Surface Modelling operations involve
creating continuous spatial distributions
from point sampled data.
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An Analytic Framework for GIS Modeling
Spatial Data Mining operations involve
characterizing numerical patterns and
relationships among mapped data.
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An Analytic Framework for GIS Modeling
Elevation
Steepness
Cost
Exposure
Cost
Discrete Cost
Average
Visual
Exposure
Renumber
Slope
Radiate
Elevation
Renumber
Slope
Steepness
…2) then
identifies the
combined suitability
for each map location…
Discrete
Cost
1)
The procedure first determines the individual suitability
for the routing criteria…
Accum
Cost
THISplace
Accumulated Cost
…3) then
Stream
Visual Exposure
Spread
Houses
Highway
Corridor
accumulates costs from a starting location to all other locations …
THATplace
…4) and
finally identifies minimum cost route as the steepest downhill path.
Optimal
Path
GIS modeling logic can be expressed as a flowchart of processing with “boxes” representing existing
and derived maps and “lines” representing map analysis operations . (MapCalcTM software commands )
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An Analytic Framework for GIS Modeling
Table 1. Cross-listing to Further Reading Resource
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An Analytic Framework for GIS Modeling
Continued…
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