An accurate tree constraints plan also includes an accurate topographical survey which should be taken showing all relevant existing site features. These features may include where trees are present, clearance of vegetation to facilitate the survey process should be undertaken only if strictly necessary and with care using hand held machinery. Mechanized flails may be used in more open areas, although bulldozing or soil stripping should be avoided. The land survey the information of which is included in tree constraints plan should include:
- the location of all trees, shrub masses, hedges etc.
- other relevant features, such as streams, buildings and other structures, boundary features, trenching scars near to trees and services including drainage runs.
- spot heights of ground level throughout the site, as a basis for avoiding changes in soil level around retained trees.
- the approximate location of trees on land adjacent to the development site, that might influence the site or might be important as part of the local landscape character.