An example of Gen 3 vegetation vectors imported into a GIS application. Area shown is North Sydney, Australia
The vegetation pack includes a vectorised set of layers that delineate above ground vegetation into approximate height based groupings. These layers include:
Note that the 11 Lawn Grass layer is available as part of AI Pack: Surfaces. These layers are vectorised in a fairly straightforward manner from the raster AI Layers, so to learn about typical error cases and precise definitions, check out the AI Layer Glossary pages linked above. Each feature (polygon) has a confidence attached that corresponds approximately to the median confidence score of the raster within that feature. Some features are multipolygons, where neighbouring high confidence features were linked by a shared low confidence area.
Characteristics and Recommended Use
The 08 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.
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.
For a precise changelog, refer to the AI Generations pages. This is a convenient summary to describe changes to this AI Pack over time:
Not available (although AI Layers were available as raster delivery).
Pack first introduced, with three vegetation layers described as above.