Introduction
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- Singlebeam data may be imported as bathymetric profiles.
- Multibeam soundings or other spread point data with depth measurements can also be imported. In order to use the foot of slope analysis tool on point data, the dataset must be gridded first. This can be done in Geocap.
- Grids may be imported directly into Geocap. Geocap supports import of several different grid file formats. Most Shelf projects will consist of a low resolution grid (i.e Etopo or SRTM) covering the whole area of interest and then smaller high resolution grids from multibeam data.
The Etopo or SRTM grids will not be accepted by the Commission as a basis for your foot of slope points. However once you have imported the grid you will be able to see the shape of the
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seafloor, and in particular the approximate position of the Foot of Slope or base of slope region.
Exercises
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East Sea is the area in red
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To ensure the most accurate calculation of the foot of slope the bathymetric profiles should run perpendicular to the seabed surface contours. |
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Generate a bathymetric profile from a grid- Display the atlantis seabed surface dataset in 2. Seabed / Grids and zoom in to the East Sea area.
- Right click the atlantis dataset again and select the command Generate Bathymetric Profile. A menu will appear.
- Click the Start button, then digitize the first point of the profile by clicking with the left mouse button where you want the profile to start on the seafloor in the display window.
- Digitize the last point of the bathymetric profile by clicking with the left mouse button where you want the profile to stop on the seafloor.
- Click Stop
- You will be prompted with a dialog asking you to provide a name for the profile. Keep the default name and click OK.
- Geocap will notify you where the resulting Bathymetric profile has been stored in the project. Click OK.
- Locate the new profile in 2. Seabed / Bathymetric Profiles. This is the default position of bathymetric profiles.
- Display the profile.
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It is possible to generate a bathymetric profile following a specific path or feature by digitizing more than one point. |
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Generate more bathymetric profiles in the East Sea areaRepeat the steps in the previous exercise and generate a few more profiles in the same area. You should have 3-5 profiles in the area. |
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Group your bathymetric profiles into a folder- Right click the folder 2. Seabed / Bathymetric Profiles and select New > Folder.
- Select Generic and type in the name East Sea.
- Click OK.
- Right click the East Sea folder and select Set Schema > Bathymetric Profiles
- Locate the profiles you generated in 2. Seabed / Bathymetric Profiles.
- Select all the profiles, right click and select Cut
- Right click the profile and select Cut.
- Right click the new East Sea folder and select Paste. The profile is now moved into the new folder.
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