Since NEON started delineating crown polygons during canopy foliage sampling, these polygon shapefiles have been delivered in the WGS1984 projection (e.g., in decimal degrees). On the other hand, all other NEON remote sensing and spatial data are projected on the UTM grid (in meters). For the 2024 sampling season and onward, NEON will project field-delineated crown polygons in the UTM grid before sharing them as part of DP1.10026.001 Plant Foliar Traits.
Regarding existing crown polygons, NEON will update the projections according to the following timeline:
Until the updates are made, note that there is nothing wrong with the polygons, it is simply an issue of mismatched units. When using a Geographic Information System like ArcGIS or similar, the software likely re-projects the polygons when loaded alongside NEON remote sensing or other spatial data. However, if using a programming software such as R, users will need to specify the UTM grid for the polygons to properly align with NEON remote sensing data.
Please use the Contact Us form for further inquiries; please select DP1.10026.001 in the Data Product dropdown list and include the term "Crown polygon projection" in the body of your request.