Occasionally, it is necessary to survey tree canopies more accurately by recording the spread of the tree in multiple directions. The International Standards Organisation defines that four spreads should be recorded and these should be at the four main compass points from the centre of the tree bole. If attribute check button ISO Tree Canopy is checked, it is assumed that this is what has been surveyed.
Each point where a tree canopy is to be produced is assumed to have a Tree Canopy dimension, TC=. The dimension string is a comma separated string of the four spreads starting at north and proceeding clockwise around the point, thus taking the form TC=N,E,S,W. The line that is produced at each point is a 4-point curve fitted polygon and there is no line connecting the points along the feature.
- To create a ISO Tree Canopy in the ⁿ4ce model, firstly you would go to the settings tab along the top taskbar and select Codes.
- Select Add and name the code for the tree(s).
- On the right hand side of the window, disable the Symbol attribute and enable Line attribute.
- In the settings box on the right, you will need to select ISO Tree Canopy and customise your line to the style you require. For more information about customising lines, see the following link: Line Styles
- Furthermore, to display the dimensions of the tree canopy, you would need to enable the Text attribute and type TC=%TC% in the Text box below. The above is an example of Text Macro; a string of text in the Text field which allows for the extraction and formatting of point; attributes, dimensions and co-ordinate information.
- Insert a point with your code and query it to open window as seen below (Point Dimensions):
- Add a New Dimension - insert the name followed by the values and click OK
- The point will then have the values required to form a line, on the left you will see the point created without values added in the Dimensions Field and on the right you will find the point created with the Dimensional values necessary create a Tree Canopy.
Without Values With Values
Alternatively, the user can set up Dimensions in Fields within ⁿ4ce which will display on their Logger prompting them to input attribute data as seen in the video above.