Introduction to Geographic Information Systems in Forest Resources
UW Home GIS@UW Search
Syllabus Schedule Class Meetings Assignments Course Data Internet Search

Current Grades

 Contact Us CFR 590 Internet-only section Lab Locations  

Assignment: Raster Analysis


  1. How much of the Pack Forest ownership is has an elevation greater than 1250 and less than 2000 feet?
    Use a raster analysis technique to get the answer. Report area in square kilometers rounded to 4 decimal places.
    Make sure to use the boundary theme to define the Analysis Extent, and the Analysis Cell Size from the dem grid. (25)



  2. For the Pack Forest administrative boundary (i.e., limit your analysis only to the area within the Pack Forest boundary theme, and use the boundary theme for the Analysis Extent), create two histograms based on the digital elevation model.
    For the first histogram, display values for elevation for areas within 100 feet to a road.
    For the second histogram, display values for elevation for areas beyond 100 ft from a road.
    The histograms should show 10 equal interval classes. (25)
    [Hint: Part of this is similar to what was done in Raster Analysis 2.]



  3. Use area tabulation to determine how much of the stands (that is, how much area) is in the combination (that is, spatial intersection) of the data sets Stands and Soils are both Mixed-Douglas-fir (Species) and Wilkeson (Soil.name).
    Use a cell size of 100 ft for your analysis. Do not limit your analysis extent or mask in any way (Analysis Extent should be set to Union of Inputs and Analysis Mask should be set to No Mask Set).
    Report the value in both hectares and square miles (round to the nearest 1/100th of a unit). (20)
    [Hints: Analysis properties, e.g., mask, extent, cell size, are set on a view-by-view basis. If you create a new view, analysis properties will be set to the default values, which is probably not what you want.
    Area tabulation creates a table whose values are in square map units.]



  4. Use a vector overlay technique to determine how much of the stands in the combination of the data sets Stands and Soils are both Mixed-Douglas-fir (Species) and Wilkeson (Soil.name).
    Do not clip by the Pack Forest boundary.
    Report the value in both hectares and acres (round to nearest 100th). (20)
    [Hint: Remember that GeoProcessing alone will not recalculate area after an overlay operation.]



  5. If there is a difference between the values you got in the last 2 questions, why do you think this is? If there is no difference between the values, why do you think this is? (10)

Answers

Syllabus Schedule Class Meetings Assignments Course Data Internet Search

Current Grades

 Contact Us CFR 590 Internet-only section Lab Locations  
 

The University of Washington Spatial Technology, GIS, and Remote Sensing Page is provided by the College of Forest Resources and the College of Ocean and Fisheries Sciences through Unit-Specific UIF. Site administrator: Phil Hurvitz.
Copyright © Phil Hurvitz, 1998-2003