1 / 9

Educational Module #2: Benthic Terrain Classification

(Larkin 2001). Educational Module #2: Benthic Terrain Classification. Emily M. Larkin and Dawn Wright Dept. of Geosciences, Oregon State University September, 2004. Objectives. On completion of the project, you should be able to: Do a slope analysis.

nathanking
Download Presentation

Educational Module #2: Benthic Terrain Classification

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. (Larkin 2001) Educational Module #2: Benthic Terrain Classification Emily M. Larkin and Dawn Wright Dept. of Geosciences, Oregon State University September, 2004

  2. Objectives • On completion of the project, you should be able to: • Do a slope analysis. • Use Raster Calculator to do simple analyses. • Use Grid to process a short command sequence that is given to you. • Define: Slope, Bathymetric Position Index, benthic, standard deviation and benthic zones.

  3. Benthic Terrain Classification • Benthic = of or pertaining to the seafloor. (e.g. A benthic animal lives on the seafloor.) • Bathymetry can be classified into different zones based on what type of terrain it is.

  4. Slope Angle (Degree) Rise Run Slope • Slope is steepness of the landscape • Percent Slope = Rise / Run * 100% • Degree Slope = the measure of the slope angle

  5. (after Weiss 2001) Bathymetric Position Index (BPI) • BPI finds out where a pixel is in relationship to its neighbors. • Raster calculator compares the position of a pixel to those around it.

  6. Bathymetric Position Index • BPI is calculated at a user-defined scale. • The resolution of the grid * the outer radius in the BPI equation • Fine-scale BPI—looks at small features (e.g small crests on a large slope) • Broad-scale BPI—looks at large features (e.g. the large slope)

  7. Benthic Zones • Divide bathymetry into 4 zones: flats, slopes, crests and depressions • Benthic zones have been linked to biodiversity (Karlson et al. 2004) • Based on: • Slope—greater or less than 5% • Broad-scale BPI—less than or greater than 1 standard deviation from the mean • WARNING—When you get to this part of the lesson, you must type everything correctly! Go slow and double-check.

  8. Module #2 • Bathymetry from Pago Pago Harbor • Slope Analysis • BPI • Benthic Zone Classification

  9. Error Correction-- • Note: On Page 12, Step 1 should read: • Add ppg5m84_neg. In the Spatial Analyst… • Step 1a—Make sure the ppg5m84_neg grid is showing…

More Related