Introduction to ArcGIS Spatial Analyst Natalie Culpepper ESRI-Atlanta

Outline ArcGIS Spatial Analyst overview Analysis tools What’s New? Today’s session will start with an overview of the Spatial Analyst product. We will then spend most of our time talking about all the analysis tools available in the Spatial Analyst. Then a little bit about customization, and finally, what’s new in 8.2 and coming in the future. As we talk about these tools, Jill will be demonstrating some of the functionality by performing a weighted overlay analysis to identify areas in Boulder County, Colorado where wildfire prevention or suppression efforts should be focused

What is ArcGIS Spatial Analyst? Integrated raster and vector spatial analysis tools Extension product that adds functionality to all ArcGIS applications

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

The Spatial Analyst toolbar Has its own environment (not part of geoprocessing) Has dialogs for the most commonly-used tools Can compose Map Algebra expressions A

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

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 DEMO Run Density on parcel points

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

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.

Zonal Overlay (cont.) Slope Watersheds Mean Slope per Watershed

Surface Analysis Hillshade Slope Viewshed Cut/Fill Curvature A Demo Surfaces Hillshade Slope Viewshed Cut/Fill Curvature DEMO Run Aspect on elevation A Demo

Reclassification Reclassify individual values or ranges of values. Load and save reclass tables. DEMO some explanation Reclassify fuel type

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

What’s 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

What’s 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