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We can now start to digitize the outer limit. We will do this in three steps. First ; first digitize the outer edge consisting of formula lines, then digitize a constraint line consisting of the distance constraints, and then finally combine these two lines.
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- left click (mouse) - will snap to the closest point on any line.
- c - crossing lines - will insert a new point between two lines, or a line and the 60NM circle.
d - delete - will delete the last digitized point.
l - connect to line - will insert a new point on the line at the cursor position.
- s - select line piece - will select all the points on a line until next crossing line or to end of line.
m - multiple selection - will select all points from previous point to picked point (mouse cursor location)
For the first exercise we have included a screen shot of the steps in the exercise.
Image Added
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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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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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Digitize the constraint lineGenerate the Outer LimitIn this exercise we are going to digitize the outer limit from your formula, and constraint lines using the Outer Limit menu. - Copy all your formula lines to the 4. Outer limit / Formulae folder (200M, FOS+60, Sed>1% points)
- Copy all your constraint lines to the 4. Outer limit / Constraints folder (350M, 2500m + 100M)
- Open the Outer limit menu, and check some of the datasets and use the Display and scale buttonsMake sure the graphics window has been cleared by clicking Image Added
- Right click the folder 4. Outer limit and click Generate Outer Limit
- Check the box next to the Constraints folder.
- Click the Image Added icon at the top of the menu to display all the activated datasets.
- Click the Start Digitize button.
- Digitze the constraint line using a combination of your mouse and keyboard short cuts.
- Click End Digitze
- You will be asked to specify a name. Type in Constraint Line 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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The Outer Limit menu with Datasets Copied
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