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The is one thing I don't understand. The article reports the use of lasers to map the ground, yet they mention the presence of foliage in situ. Assuming that th
by ziotom78 9y ago
The is one thing I don't understand. The article reports the use of lasers to map the ground, yet they mention the presence of foliage in situ. Assuming that they use optical or infrared lasers, foliage should be completely opaque at these wavelengths. How did they manage to map the asperities and characteristics of the ground?
- Pica_soO 9y agoA filter that takes the most deepest z-value you get, considering all else in a square meter as noise- or foliage?
- Dangeranger 9y agoLiDAR wavelengths are returned at various depths from within the forest canopy. In order to get a return on the ground you simply filter the returns down to the last value. Sometimes however you want to keep the other returns and so you filter the values down to say 10% of all returns from a given depth, with a constraint between the depths of say 10cm so that you can see the density of the layers.