Suitability Analysis in Raster GIS. Combining Multiple Maps
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1 Suitability Analysis in Raster GIS Combining Multiple Maps
2 The Challenge Thus far Single or Dual Factor Overlay Analyses i.e. Land Cover on Private Land Biophysical Analyses with Algebraic Formulas i.e. RUSLE Landscape Planning Dozens to hundreds of spatial factors Factors have apples and oranges characteristics Combinations must reflect social values, not just (bio)physical processes Best for industrial development from whose perspective? Therefore Suitability Analysis is not objective - must typically be vetted by experts If experts are not GIS experts (i.e. local stakeholders), suitability factors and their combination must be visually explained Weighting and rating is a key opportunity for public deliberation
3 Suitability Analysis General purpose To rank potential sites according to suitability for a proposed type of activity Requirements A set of factor or criteria maps, organized to rate sites relative to one or more characteristics A technique for appropriately combining factors
4 Types of Criteria Absolute Frequently hard-edged Often include property ownership/management zones Often involve legal standards Relative Typically fuzzy edged E.g. proximity to X where closer = better, but no absolute distance known in advance Often involved in trade-offs where values ranges come from specific data within a place Criterion 1 = Low rent and criterion 2 = close to school
5 Suitable For Whom? Suitability models have a point of view Audience can be human Affordable housing Best sites for High-end commercial Audience can be environmental Best habitat for black bear Most suitable multispecies conservation areas Can be implicit or explicit But better to be explicit where possible
6 Common Units How do you combine a map representing meters to nearest road Units = meters with another representing land cost? Units = dollars Short Answer: find or create common units Easiest: likert scale preference units A range of values: 1 to 5, or 1 to 9 Polar opposites on both sides of range i.e. Best / Worst, Most Suitable / Completely Unsuitable
7 Cautions with Likert Scales Consistent Application With multiple factors, must make sure that scale consistently applied example analysis: want to be near streams and far from roads, using 1..9 with 9 = best Calculate distance to streams, distance to roads Reclassify stream distance to preference units Closest = 0 distance = 9 Reclassify road distance to preference units Closest = 0 distance = 1 In other words, may need to flip values when reclassifying Doesn t really avoid scaling issues, just defers Sensitivity and range in price/distance may be different Often what s needed from initial analysis is range of the possible
8 Automating Analyses with ModelBuilder
9 Overview Why Use ModelBuilder? ModelBuilder Basics Common ModelBuilder Problems Advanced ModelBuilder
10 Why Use ModelBuilder? An automation tool But comes with some startup overhead Most useful in two circumstances Documents models & their parameterization Allows experimentation with model parameters particularly for weighting and rating Common Types of Models ETL Extract, transform and convert raw data Suitability Building attractiveness maps
11 ModelBuilder Basics Basic idea is that of a dependency diagram User specifies inputs, processing and outputs If inputs change, system repeats intermediate operations as needed Diagram has three kinds of elements Inputs Geoprocessing Operations Outputs Output from one operation can be used as input to an other, allowing chaining
12 ModelBuilder Setup Rather obscure to start implemented as a custom toolbox tool Open toolbox panel Create empty toolbox Right mouse on Toolboxes, select New Toolbox Create empty model Right mouse on new Toolbox, select New Model Then populate model by drag and drop Of data layers from map table of contents Of geoprocessing operations from the toolbox Finally, wire data and processing boxes together
13 Example: Simple MB Model Goal Create a factor map expressing simple proximity to residential landuse where output is classed from 1..9 Method Create new model Select residential landuse from San Miguel Parcels database Add Euclidean distance geoprocessing operation Connect landuse (input) to distance (process), specifying new grid (output) Run Add Reclass Operator Connect output grid of distance operator to input of reclass, specifying new output grid Run again
14 Review of Simple Model Benefits Multiple logical steps encapsulated in a single step Model Logic Recorded in Diagram Model Parameters Recorded Problems / Caveats Default is not to show results Model as Created is 100% specific to particular data paths/locations on disk Model Saving Bizarre.. Default operation names make no sense to end users Spatial Analyst Toolbar Options do *not* inherit
15 Showing Results Simple, but not Obvious Right Mouse on Output -> Add to Display If at first you don t succeed, try toggling again
16 Saving / Finding Models By default, models saved in My Toolboxes folder Main menu Tools->Options->My Toolboxes Default is C:\Documents and Settings\(Username) \Application Data\ESRI\ArcToolbox\My Toolboxes Easiest to find in ArcCatalog/My Toolboxes Can Add Toolbox stored on disk
17 Making Models Generalizable Running Models Can Double Click on Models in Toolbox Panel By default, not too useful, because no user control of outputs Generalizing Models By default, models only use exact data originally specified To make a model into a true tool need to specify which inputs / outputs are variable parameters Right mouse on input or output Select Parameter (toggle) After Parameters are set, double clicking brings up user dialog
18 Making MB Diagrams Legible All elements can be renamed from right mouse menu Rename layers if necessary to clarify Explain intent of geoprocessing operations i.e. Isolate Residential Landuse instead of reclass1 If Desired, change diagram properties Square Circle Square Box Background Colors If you need better quality, export diagram
19 Environment Variables in MB Note Spatial Analyst Options settings not inherited Must explicitly specify for MB Two options Can do once for all toolboxes (recommended) RM Top Toolbox->Environment Settings General Settings -> Extent Raster Analysis Settings -> Cell Size Can do once for each model
20 Model 2: Weighted Overlay Goal: To Create an Attractiveness Model with ability to Weight factors Method: Create separate ModelBuilder models for each factor Nest models into master MB model Combine with weighted overlay
21 Model 2 Implementation Factor 1: Proximity to Residential Factor 2: Proximity to Ski Slopes Created by copying and pasting factor 1 model and adjusting inputs and outputs Weighting Factor 1 = 2X Factor 2 Use Spatial Analyst Weighted Overlay tool
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