Manipulating Vector Mode Databases

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Manipulating Vector Mode Databases
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Operations

• Dissolve
• Append
• Clip
• Intersect
• Union

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Dissolve
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Append
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Layers to Append
Input Layer 1
Input Layer 2
Appended Layers
Overlapping Polygons/Polylines are preserved!
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Clip
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Intersect
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Intersection

• Where are the Road segments that are in flood
  prone areas.
• Select flood prone from Input Layer 1
• Intersect roads and flood prone Layer 2.

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Intersect Features
Input Layer 1
Stream
Flood Prone
No Flood
Panel 1
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Panel 3
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Intersection

• Where are the places that are residential and
  flood prone.
• Select flood prone from Input Layer 1
• Select residential from Input Layer 2
• Intersect

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Intersect Features
Input Layer 1
Stream
Flood Prone
No Flood
Panel 1
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Intersect Features
Output Layer
Residential Flood Prone
Extent
Panel 4
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Union
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Lets See How It Works
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Dissolve
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Dissolve Operation
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Add Field for Dissolve
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Name and Type of Field for Dissolve
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Resulting field
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Do the Dissolve
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Dissolve Dialog
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Append Operation
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Append Dialog
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Clip Operation
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Clip Dialog
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Intersection
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Intersection Procedure

• Where are the areas that are residential in land
  use and flood prone?
• Select flood prone areas from flood prone layer
• Select residential areas from land use layer
• Do intersection

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Intersect
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Select by Attributes Dialog
Selecting flood prone and water areas
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Select by Attributes Dialog
Selecting residential areas
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Intersection Operation
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Intersection Dialog
Remember, if you did a selection, then get
input features from drop down or drag into
dialog from TOC
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Intersection Result
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Intersection Result
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Union
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Union Operation
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Union Dialog
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ModelBuilder
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Introduction to ModelBuilder

• Over the past semester, we've performed several
  geoprocessing tasks
• We have used geoprocessing tools in sequence to
  analyze GIS data
• ArcGIS allows you to link tools together to
  create a workflow

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Homework Flashbacks

• You have a set of points, that you want to clip
  to a county, then find the count of points that
  fall within each municipality
• You have a statewide layer you want to clip to a
  specific feature, then dissolve
• ModelBuilder will allow you to select features,
  perform tasks like clip, spatial join, merge, etc

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Inside ArcToolbox

• Models and Scripts are added to custom toolboxes
  you create in ArcToolbox.

Toolbox
Toolset
Script
Model
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How ModelBuilder Works

• Drag layers you want to participate into the
  model
• Drag tools you want to use into the model
• Output layers, tables, objects shown in green
• Connect the features using arrows
• Order matters to certain tools (Clip)

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Revisiting Assignment 3

• In this assignment, we selected the
  municipalities in Gloucester County
• We then selected the KCS within the Gloucester
  County municipalities
• Finally, we performed a spatial join on the two
  layers to find a count of KCS within each of the
  municipalities

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Getting Started

• Let's make a new Toolbox to store our models
• Make a new model inside the Toolbox
• Edit the model

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Drag and Drop Interface
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Order Matters
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Order Matters
1
2
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Order Matters
2
1
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Final Model
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Additional Functionality

• The Model can be expanded further, with more data
  and tools
• The Model can be exported into a scripting
  language, allowing for greater modeling
  capabilities.

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Additional Functionality

• Python is a default (and recommended) scripting
  language for ModelBuilder
• Cursor-based analysis For each individual
  feature in a layer, perform some analysis
• For each "vacant" polygon, is it surrounded by
  environmentally sensitive features?
• Count each feature's vertices, rings
• Internet access download data, analyse

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Going Further

• A ModelBuilder OverviewAvailable on ESRI's
  support page
• Getting Started Writing Geoprocessing
  ScriptsAvailable on ESRI's support page
• Dive Into Pythonhttp//www.diveintopython.org/
• Learning Python, 3rd Editionhttp//www.oreilly.co
  m/catalog/9780596513986/