The Basics of LiDAR - Light Detection and Ranging - Remote Sensing [tree focused]
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https://www.neonscience.org/resources/learning-hub/tutorials/LiDAR-basics <-- shared tutorial
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[this post should not be considered an endorsement of any organisation, but is shared for learning purposes]
“LiDAR or Light Detection and Ranging is an active remote sensing system that can be used to measure vegetation height across wide areas.
This [tutorial] page… introduce[s the] fundamental LiDAR (or lidar) concepts including:
• What LiDAR data are.
• The key attributes of LiDAR data.
• How LiDAR data are used to measure trees...”
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The Basics of LiDAR - Light Detection and Ranging - Remote Sensing | NSF NEON | Open Data to Understand our Ecosystems

LiDAR or Light Detection and Ranging is an active remote sensing system that can be used to measure vegetation height across wide areas. This page will introduce fundamental LiDAR (or lidar) concepts including: