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Exercise 7. Raster Analysis in ArcGIS October 9-10, 2008

Exercise 7. Raster Analysis in ArcGIS October 9-10, 2008. Today. Raster analysis in ArcGIS Working with raster datasets Working with Spatial Analyst extension Multi-part analysis example: Answering spatial questions with grids Hand out exercise 7 Final project handed out

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Exercise 7. Raster Analysis in ArcGIS October 9-10, 2008

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  1. Exercise 7.Raster Analysis in ArcGIS October 9-10, 2008

  2. Today • Raster analysis in ArcGIS • Working with raster datasets • Working with Spatial Analyst extension • Multi-part analysis example: Answering spatial questions with grids • Hand out exercise 7 • Final project handed out • Final exam time signups

  3. Spatial Analyst extension What is an extension? Steps: • Load extension • Load extension’s toolbar

  4. Spatial Analyst extension • Spatial Analyst toolbox • Extraction tools: Extract by Mask (used to clip grids) • Zonal tools: Tabulate Area, Summarize by Zone (used for numeric summaries of grids) • Spatial Analyst menu • Distance function • Surface functions: Contour, Hillshade, Slope, Aspect, Viewshed Hillshade Slope Aspect Viewshed

  5. Grid layers: Layer properties • Right-click layer, view properties • Source tab tells you: • Cell size • Grid status (temporary or permanent) • File name • Statistics: Min, mean, max

  6. Grid attribute tables • Most grid based layers have attribute tables • Attribute tables include: • Value: Numeric value • Count: Number of cells with value • Finding area: (Number of cells) x (Area of a cell) Shown here:Attributes of NLCD land cover Value 11 = Open Water 692,997 cells

  7. Raster Calculator • Used to query grids and to perform map algebra List of grid layers in map Query expression

  8. Grid data format • Grid: ESRI’s raster data format • Manage Grid datasets using ArcCatalog only • Move, copy, paste, rename, delete

  9. Exercise 7 overview • Open blank map, add grids for WV elevation, land cover • Look at grid layer properties • Clip grids to mask (Blackwater River watershed) • Use Raster Calculator to query grids • Run Spatial Analyst surface functions: • Contours • Hillshade • Slope • Run analysis with Raster Calculator: • Model areas suitable for wind farm development

  10. Exercise 7: Modeling steps • Exercise includes steps to create a map of areas suitable for wind farm construction in the Blackwater River watershed, Tucker County: • Requirements: • Must be within 500m of a road • Must be over 1000m in elevation • Must be in private land ownership

  11. Wind farm model Raster Calculator: Distance <=500 Distance function 0: Distance > 500m 1: Distance <= 500m Roads Raster Calculator: Multiply Grids for Final Result: Areas meeting all three criteria Raster Calculator: Elevation >= 1000 0: Elevation < 1000m 1: Elevation >= 1000m Elevation Convert to Raster function 0: Public land 1: Private land Land Ownership Starting Layers Analysis Steps Preliminary Results Final Result

  12. Final class project report • Watershed Assessments using GIS: • Use of GIS to characterize your watershed • Written report describing your watershed • Include maps, figures, tables • See handout for details and assigned watershed • More details provided in next Monday’s lecture • Due Monday October 27, 9:00 am sharp

  13. Final exam • Format: • Multiple choice and short essay questions (~60%) • “Hands-on” GIS questions in lab (~40%) • Sample/practice questions will be handed out in lecture • Sign up for final exam time/date (2.5 hours): • Wednesday Oct 22: 5:00pm to 7:30pm • Wednesday Oct 22: 7:30pm to 10:00pm • Thursday Oct 23: 1:00pm to 3:30pm • Friday Oct 24: 10:00am to 12:30pm • See J Strager if you need other arrangements (ASAP)

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