While much of Envision's work is essentially
3D, mapping nevertheless plays an important part in our range of services,
usually complementing 3D work
Click on any of the images on the left to see a larger version and a
One of the traditional uses of maps is simply as an aid to understanding the
shape and content of the world around us. Some of Envision's mapping output
continues that tradition, using a number of techniques. We often use simulated
lighting of the land surface (hill shading) or graduated colours to represent
altitude (hypsometric tints). Sometimes we add these features to published
digital mapping such as that supplied by Ordnance Survey.
The purpose of mapping of this type it to enable our clients to understand
and explain to others the topographic context for their schemes, perhaps as an
aid to site selection or to finding a route through an area.
Envision has considerable experience with GIS (Geographical Information
Systems) and increasingly uses the analytical facilities of GIS to help clients
analyse enviromental and other constraints and the interactions between them as
part of a site selection or routeing process.
Visibility is often an important consideration in environmental assessment.
Envision had developed its own visibility analysis software to carry out a
number of types of analysis. Straightforward tests of visibility can be carried
out and can optionally include the effect of intervening land use features such
as forestry. Visibility and cutoff radii can be applied to limit the extent of
analyses. In addition to simple visibility, analyses can be carried out showing
where objects will be seen backclothed or against the sky. The presence of
areas of dead ground and its depth can also be determined relative to any
viewpoint or group of viewpoints.
Cumulative visibility mapping is also increasingly a requirement,
particularly with reference to wind energy developments. Envision has developed
a variety of techniques to show the combined visibility of two or more