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Terrain Mapping

Terrain Mapping. DEMs Contours Slope Aspect Hillshades. Digital Elevation Model (DEM). Mt. Hood. Counters. Generates a polyline Shapefile. Contours. 2200m. 2100m. 2000m. 1900m. DEM Cross Section. 200 Meter Countours. Calculating Slope. DEM Cross Section. Slope Calculation.

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Terrain Mapping

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  1. Terrain Mapping • DEMs • Contours • Slope • Aspect • Hillshades

  2. Digital Elevation Model (DEM) Mt. Hood

  3. Counters • Generates a polyline Shapefile

  4. Contours 2200m 2100m 2000m 1900m DEM Cross Section

  5. 200 Meter Countours

  6. Calculating Slope DEM Cross Section

  7. Slope Calculation • Fits a plane through 3x3 pixels around the pixel of interest • What effect does this have on the uncertainty of the resulting raster?

  8. Slope Calculation Rise Angle Angle Run • Slope = (Rise/Run) * 100% • Can be: • Degrees • Percent 3 x 3 Cell

  9. Z-Factor • Converts the elevations in the DEM to the same units as the x,y dimensions • Easiest approach is to: • Project the DEM to a spatial reference that is in meters (i.e. UTM) • Scale the elevation values the meters if not already in meters

  10. Slope

  11. Aspect – Direction of the slope Aspect (Direction) Slope Rise Angle Run Slope = (Rise/Run) * 100%

  12. Aspect

  13. Hillshade • Creates a raster that appears to be a photo from above the area, shaded by the sun. • Frequently used as a background, rarely for analysis • Z-factor can be used to make the hillshade more dramatic

  14. Hill-shade

  15. Hillshade: Z-Factor=1

  16. Hill-shade: Z-Factor=10

  17. Color Hillshade • Transparent DEM with Color Ramp

  18. Hillshade: RMNP

  19. Resample Can Remove Artifacts

  20. Resolution*2, Bicubic

  21. Create Your Own Backgrounds!

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