Lines - ISO Tree Canopies

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 the 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 produced at each point is a 4-point curve fitted polygon with no line connecting the points along the feature.

• To create an 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 the 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 to create a Tree Canopy.

                                 Without Values                                     With Values

Alternatively, you can set up Dimensions in Fields within ⁿ4ce, which will display on a compatible Logger, prompting you to input attribute data as seen in the video above.

Create a tree by indicating the N, S, E and W values. This is done by inputting NORTH, SOUTH, EAST and WEST into the Dimensions under the Fields tab as seen below: (Note you will still be required to input the R dimension to represent the Bole radius of the tree)

In the Tree point, you will be able to input the value for each Dimension as seen below, these can be changed at a later date if required. On the left side, you will see a tree point with the values inputted and on the right, a tree point with no N, S, E and West values inputted. (Note that the Point Properties box belongs to the tree point on the left)

Tree with values inputted	Tree without value inputted