Introduction to ArcGIS Spatial Analyst

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Introduction to ArcGIS Spatial Analyst
Natalie Culpepper ESRI-Atlanta
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Outline

• ArcGIS Spatial Analyst overview
• Analysis tools
• Whats New?

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What is ArcGIS Spatial Analyst?

• Integrated raster and vector spatial analysis
  tools
• Extension product that adds functionality to all
  ArcGIS applications

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Key Features

• More than 300 functions and operators
• Analysis on all raster formats
• Analysis on all vector formats
• On-the-fly projections
• Great developer tools

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The Spatial Analyst toolbar
A
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Analysis Tools

• Density Mapping
• Neighborhood and Block Statistics
• Zonal Overlay
• Surface Analysis
• Hydrologic and Groundwater Analysis
• Reclassification

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Density Mapping

• Count occurrences of a phenomena within an area
  and distribute it through the area.
• Use points or lines as input.
• Population per Km2
• Road density per Mi2

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Neighborhood and Block Statistics

• Calculates a statistic for a neighborhood
• Majority, Maximum, Mean, Median, Minimum,
  Minority, Range, Sum, Standard Deviation, Variety
• Used for filtering, data smoothing, and data
  aggregation

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Zonal Overlay

• A zone is all the areas/cells with the same
  value.
• Calculate a statistic within the zones for each
  cell in a raster.

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Zonal Overlay (cont.)
Slope
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Surface Analysis

• Hillshade
• Slope
• Viewshed
• Cut/Fill
• Curvature

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Demo
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Reclassification

• Reclassify individual values or ranges of values.
  
• Load and save reclass tables.

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Hydrologic Analysis

• Create watersheds and stream networks from DEMs
• Flow Direction
• Flow Accumulation
• Watershed Delineation
• Flow Length
• Sink Filling
• Stream Ordering

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Whats New in Spatial Analyst at 9.2?

• Solar radiation tools
• New math functions
• Weighted Sum tool
• Spline with Barriers
• Histogram tool colors now match layer

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Whats New in Spatial Analyst after 9.2?

• Performance Improvements
• Combine 40x faster (SP1)
• Was 1 hr, now 1.5 minutes on 250 thousand
  combinations
• Now works on millions of combinations
• Fill 45x faster
• Was 9.5 hrs, now 12 minutes on 350mb DEM with
  over 2 million sinks.
• Improved error messages and status
• New Contour with Barriers tool