Visual Impact Assessment Guidebook
Table of Contents
Digital terrain model presentation criteria
The following information should be
included with or shown on each digital terrain model plot:
- Title (e.g., "Digital Terrain Model of . . ." or "Perspective view of . .
- Geographic area name (e.g., Lake X, Highway XX)
- Name and/or number of viewpoint used to produce plot
- Viewpoint UTM co-ordinates
- Elevation of viewpoint above ground (normally 1.6 m)
- Licensee name
- Licensee and/or cutting permit number
- Existing cutblock or road (including numbers)
- Proposed cutblock or road (including number)
- Average tree height used for forest cover
- Lens size (Ministry of Forests recommends 50 mm)
- Direction of view angle in degrees (centreline of vision cone)
- Vertical viewing angle (degrees)
- Vertical exaggeration (Ministry of Forests requests none)
- Name and telephone number for person who produced DTM
- Date plotted
- The recommended DTM plot size is 11 x 17 inches. Each DTM plot should be accompanied
with a plan-view map.
- A photograph taken from the same viewpoint location as the DTM plot should also be
attached to the plot, especially if used for public presentation.
- The plan-view map DTM plot and photograph(s) should all be oriented in the same way in
relation to each other.
- If colour codes are used on the plot instead of labels, then a colour-coded legend
should be used to differentiate between water features, existing and proposed roads, and
existing and proposed blocks.
Basic features or data to show on the
accompanying plan-view map:
- Number of topographic map
- Contour lines with roads and water features
- Scale of map; 1:50 000 or larger scale preferred (e.g., 1:20 000 or 1:10 000)
- Existing cutblocks or roads
- Proposed cutblocks or roads
- Viewpoint location used for the DTM (shown on the map with a symbol) with centre and
cone of vision lines matching the perspective view.
- Visual landscape inventory data, such as visible area and visual sensitivity unit (VSU)
boundaries, VSU label including number and ratings, and visual quality objective.