The vegetation pack includes a vectorised set of layers that delineate above ground vegetation into approximate height based groupings.
Characteristics and Recommended Use
The Medium & High Vegetation (>2m) layer is the most useful and highest quality layer in the group. The other two are best considered as "support" layers, for situations such as overlapping Low and Medium/High vegetation, to denote some ambiguity between a tree and a large bush.
Results tend to be highly robust to leaf-on vs leaf-off situations, although the raster (and corresponding vector features) may be slightly smaller due to the difficulty in identifying the smallest bare branches and twigs on leaf-less trees.
Typical use cases include:
- Vegetation management (identifying where trees overlap with other assets such as buildings or electricity transmission and distribution infrastructure).
- Fire and storm risk assessment for properties and areas.
- Assessing change over time using historical results (for this, we recommend seasonally matched surveys are used).
- Combining with our DSM and DEM data to produce height contours for more detailed analysis.
Nearmap conducted a study on the tree cover changes using the vegetation AI data. Read about this study here: https://www.nearmap.com/au/en/aerial-view-blog/aerial-map-tree-cover-statistics-in-adelaide.
API Notes for Large Objects
The AI Feature API truncates feature classes in the vegetation pack to the intersection of the feature with the query AOI. This is because a vegetation feature can be almost unbounded in size, such as a forest in a national park, which clearly cannot be returned in a sensible way in a single API payload.