Chances are if you are in Alaska the leaves are already off the trees. In the North-Eastern Parts of the US they are changing color and getting fall. Virginia and below this should happen in November.
WHY IS OFF LEAF IMPORTANT FOR LIDAR MAPPING?
Many people think that lidar penetrates vegetation..and they are right to a point. However, waiting till the leaves have fallen can be the difference between 8 points per meter squared and 150 PTS/M^2 after ground classification of your data.
This allows much richer data sets for those who are conducting topographic surveys, forest mapping, and environmental studies.
Here is what the data looks like with on-leaf. All cases were done on the same range on the same day. This was Central California near Yosemite National Park where we have varying density of deciduous tree canopy.
Riegl MiniVux On-Leaf Vegetation. This is with 5 Returns Imagine what returns you would have with off leaf.
Quantergy M8 On-Leaf Vegiation Analysis. This is with only 3 returns.
Velodyne Vlp 16 On-leaf Vegitation Penetration Analysis. This is with only 2 returns.
This is a side view of VLP-16 in Virginia during Off Leaf conditions. here we had a mix of conifer and deciduous trees. However the point is the increase in forest floor returns.
WHAT MOST PEOPLE DON’T THINK OF: THE BOTTOM LINE.
With off leave mapping, you can run your systems faster and use sensors with less point density (which are way more affordable).
However, to this means there is a very small window so your field operations need to be the most efficient they can be.
If you want to learn more about how to effectively run UAV LiDAR in your business. Check out our Drone Lidar Operator’s course. Perfect for learning everythign you need to get starting in the field… LEARN MORE HERE
If you have a project coming up and you want to explore drone lidar this fall, check out our lidar renting service. This is helping a lot of companies that want an in-house capability to get started with drone lidar mapping. LEARN MORE HERE