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| borderColor | #404040 |
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| bgColor | #F0F0F0 |
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| borderWidth | 1 |
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| title | Exercise |
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| borderStyle | dashed |
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Digitize the outer edge- Click the Start Digitize button.
- Snap to a point on the 200M line by placing your mouse cursor over the line in the East Sea area and clicking the left mouse button.
- We are now going to follow this line north until we meet the crossing 60M line. Place your cursor close to the crossing between the 200M line and the 60M line and press s on the keyboard.
- We now want to follow this 60M line until me meet the next crossing 60M line. Place your cursor close to the crossing between the 60M line we are at and the next 60M line and press s
- Again we want to follow this 60M line until me meet the next crossing 60M line, but we want to make sure it follows the outer part of the 60M line. Place your cursor somewhere on the outer part of the 60M line and press m.
- Follow the line to the next 60M crossing line by placing your cursor close to the crossing between the 60M line we are at and the next 60M line and press s.
- We now want to follow this 60M line until me meet the crossing 200M line. Place your cursor close to the crossing between the 60M line we are at and the 200M line and press s
- We now want to follow the 200M line until me meet the crossing 60M line again. Place your cursor close to the crossing between the 200M line and the crossing 60M line and press s
- We now want to follow this 60M line until we can reach the sediment thickness points. Place your cursor further up on the 60M line and press m
- When you can see the sediment thickness points inside the white circle you can connect to them by clicking the left mouse button. Tip: place the cursor outside the point furthest out to snap to the "maximum" point.
- Continue to click the left mouse button until you are passed the sediment thickness area.
- We now want to connect to the 60M line in the north. Place your cursor close to the crossing between the 60M line and the white 60M circle and press c.
- We now want to follow this 60M line until me meet the crossing 200M line, but we want to make sure it follows the outer part of the 60M line. Place your cursor somewhere on the outer part of the 60M line and press m.
- Follow the line to the 200M crossing line by placing your cursor close to the crossing between the 60M line and the 200M line and press s.
- We now want to follow this 200M line a little bit further to the west. Place your cursor somewhere to the west on the 200M line and press m.
- Stop digitizing by clicking End Digitize
- You will be asked to specify a name. Type in Outer Edge Limit and click OK
- The dataset is stored in 4. Outer limit / Outer Limit click OK
- Click Close to close the Outer Limit Menu
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One important part of the outer limit line definition is that it should consist of: straight lines not exceeding 60 nautical miles in length, connecting fixed points. This means we can bridge some of the concave areas of the Outer Edge Line to gain more area
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| borderColor | #404040 |
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| bgColor | #F0F0F0 |
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| borderWidth | 1 |
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| title | Exercise |
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| borderStyle | dashed |
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Optimize the Outer Edge Limit- In the folder 4. Outer limit / Outer limit right click Outer Edge Limit and click Optimize outer limit
- Keep the default settings and click Execute. The result will be stored in the same folder
- In the folder 4. Outer limit / Outer limit right click Outer Edge Limit Optimized and click Display
- Investigate the areas that have been bridged.
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| Warning |
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The Optimize outer limit tool is based on angle calculation and not area calculation. The angles are calculated base on what ever coordinate system the data is in. Thus, It cannot be assumed this tools will automatically produce the absolute maximum achievable area. |
We are now going to digitize the constraint line. It is important to remember that we want to select the constraint line which is furthest out at any point.
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| borderColor | #404040 |
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| bgColor | #F0F0F0 |
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| borderWidth | 1 |
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| title | Exercise Continued |
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| borderStyle | dashed |
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- Digitize a combined formula line, by clicking the digitize button and following the instructions
- When you have finished digitizing and clicked the end digitize button, give the new dataset a name, such as combined formula line.
- Right click the new line in the project, and select Table view
- Observe the new columns in the table
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There are also two tools which have been developed in order to Optimize the outer limit and to Maximize the outer limit. These tools should be used with great care in order for them to be utilized correctly. It cannot be assumed these tools will automatically produce the absolute maximum achievable area. They are interactive tools that should be experimented with, using different settings until the desired result is obtained.