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Creating Shaded Relief Images

Creating Shaded Relief Images. Using Aerial Photos, DEMs and ArcMap. Color aerial photo with .5 m resolution. DEM with approx 10 m resolution. Hillshade created from DEM with default lighting at 315° azimuth, 45° altitude.

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Creating Shaded Relief Images

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  1. Creating Shaded Relief Images Using Aerial Photos, DEMs and ArcMap

  2. Color aerial photo with .5 m resolution

  3. DEM with approx 10 m resolution

  4. Hillshade created from DEM with default lighting at 315° azimuth, 45° altitude

  5. Hillshade created from DEM with lighting at 170° azimuth, 40° altitude to approx match shadows on aerial photo

  6. Hillshade with 315° lighting angle Hillshade with 170° lighting angle

  7. conflicting shadows Naturally lit orthophoto Hillshade lit from 315°

  8. complimentary shadows Naturally lit orthophoto Hillshade lit from 170°

  9. Combined orthophoto and semi-transparent hillshade using hillshade constructed with 315° lighting angle

  10. Combined orthophoto and semi-transparent hillshade using hillshade constructed with 170° lighting angle

  11. Inset of shaded relief orthophoto using 315° lighting angle

  12. Creating 3D Scenes Using Aerial Photograph, DEM and ArcScene

  13. Aerial photo added to ArcScene, default view

  14. Photo rotated and viewed edge on confirms 2D representation

  15. In the Layer Properties box for the air photo, click on the Base Heights tab and change the setting to obtain heights from surface and browse to the correct elevation file. The airphoto is now draped over the elevation surface as seen in this edge-on view

  16. The default view now shows a true 3D representation of the scene

  17. The Layer Properties Rendering tab is the key to getting good-looking images in ArcScene. Check the Shade areal features … box (this is unchecked by default). Change the Quality to High (this is set to a midpoint position by default). The high-quality render takes up lots of video memory, so, if you’re running on an older PC or one without a high end video card, your image may break up as it is rotated in ArcScene. The Shade areal features… comes into play on the next step, which will not work if this is not checked.

  18. Scene Properties Illumination governs the scene light position. This light position, and checking the “shade layers relative to scene light” box in the layers properties, governs how shadows and highlights play across the scene as it is rotated, enhancing or disrupting the 3D effect.

  19. The Sun Position and Elevation http://www.srrb.noaa.gov/highlights/sunrise/azel.html Lat/Long read from ArcMap screen Date and time from meta data

  20. 315° 170°

  21. Zooming in for a closer look Scene light set to 315°: conflicting shadows do not match those in the air photo

  22. Scene light set to 170°: Noconflicting shadows with those in the air photo

  23. 315° lighting angle 170° lighting angle

  24. High quality render setting

  25. Medium quality render setting

  26. Low quality render setting

  27. Render Quality Comparison High, Medium, Low (L to R)

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