Geoprocessing ii
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Geoprocessing II. Just what is Geoprocessing?. Geoprocessing is used by everyone that uses ArcGIS. Whether you're a new user or an old pro, geoprocessing will become an essential part of your day-to-day work with ArcGIS. (esri) So we have to emphasize it!. Two flavors of Geoprocessing.

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Just what is geoprocessing l.jpg
Just what is Geoprocessing?

  • Geoprocessing is used by everyone that uses ArcGIS. Whether you're a new user or an old pro, geoprocessing will become an essential part of your day-to-day work with ArcGIS. (esri)

  • So we have to emphasize it!

esf Laboratory for Applied GIS


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Two flavors of Geoprocessing

  • Process modeling

    • What we have been talking about

    • Is a model of a physical process

    • Can be static or dynamic – iteration

  • Simulation

    • Explicitly model a process in time

esf Laboratory for Applied GIS


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Simulation

  • Model a phenomenon in time

    • Example: Forest fire growth

  • Create realizations of a phenomenon as it moves through space and time with changing variables (fuel load, weather)

  • Can be Deterministic or Stochastic

esf Laboratory for Applied GIS


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Simulations

  • Deterministic

    • Model with well understood rules

  • Stochastic

    • Have a component of randomness

      • Don’t fully understand the rules

      • Error in input data (very common)

      • Error in model parameters

      • Interactions between layers (propagation of error)

esf Laboratory for Applied GIS


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More?

  • This gets pretty complex and the online help system has some very good discussions on the subject.

  • Got to

    • bhelp.esri.com/arcgisdesktop/9.2/index.cfm?id=923&pid=921&topicname=General_concepts_of_modeling_through_simulations

esf Laboratory for Applied GIS


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Its Purpose

  • Almost all uses of GIS involve repetition

  • The automation of geospatial tasks

    • Saves time

    • Provides documentation

    • Share methods

  • These methods are called Workflows

esf Laboratory for Applied GIS


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Workflows

  • A Workflow is a collection of Steps and data that define the paths that can be taken to complete a task. ...

  • So when presented with a problem with a set of criteria that must be met

  • You generate a workflow

esf Laboratory for Applied GIS


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A Problem

  • Task is to find tax parcels that could possibly be used for a nature center

    • Are at least 20 acres in size

    • Have both forest and Agricultural lands

    • Are within 6 miles of each of the town’s schools

    • Contain a stream or river (or be on a river bank)

    • Preferable the parcel should be owned by the town or the state

esf Laboratory for Applied GIS


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And the derived workflow is…

  • What tools would be used for each of the criteria?

  • In what order would these sub-tasks be undertaken?

  • Graphically…

esf Laboratory for Applied GIS


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Schematically

Process

Data

Data

Process

Data

Or by text list

esf Laboratory for Applied GIS


A problem12 l.jpg
A Problem

  • Task is to find tax parcels that could possibly be used for a nature center

    • Are at least 20 acres in size

    • Have both forest and Agricultural lands

    • Are within 6 miles of each of the town’s schools

    • Contain a stream or river (or be on a river bank)

    • Preferable the parcel should be owned by the town or the state

esf Laboratory for Applied GIS


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