Sentence examples for canopy returns from inspiring English sources
Maybe they will be back when the canopy returns.
These metrics were estimated by considering only canopy returns (h ≥ 2 m).
The term CHM is nominal as it is primarily derived from canopy returns but will contain other identified non-ground features such as buildings in urban areas.
Development of accurate LiDAR height metrics are reliant on an accurate digital terrain model (DTM) as the canopy returns must be converted from elevation above sea-level to height above the DTM.
This is explained by the fact that the metrics from the point cloud were computed considering all canopy returns (h > 2 m); whereas for the CHM the height of each pixel used to compute them represented the highest return within it.
Reclassification of ground and canopy returns in the thinned datasets resulted in a larger fraction of points being classified as ground returns after thinning.
A strong relationship (r2 = 0.86) also existed between the number of TLS and ATLS canopy laser returns.
These results should be viewed as an initial assessment of using these combined sensors to estimate tropical forest biomass; hyperspectral data were reduced to nine indices and three spectral mixture fractions, lidar data were limited to first-return canopy height, sensors were flown only once at different seasons, and we explored only linear regression for modeling.
However, dissolved returns by canopy exchange via throughfall plus stemflow contributed up to 50% of total aboveground nutrient return.
From left to right: 10 cm aerial photo; mean canopy height from LiDAR returns at 15 m resolution; forest/non-forest map obtained by filtering mean canopy heights below 5 m (per country forest definition); Fragmentation classification Fig. 6 Example of fragmentation assessment in northern DRC.
LiDAR metrics extracted for the analysis included the 30th, 70th and 95th height percentiles, mean height and canopy cover (percentage of returns from above a cut-off of 0.5 m to remove the understorey) as these are widely used for development of volume equations.
