Topics

1

General / Automate tree height determination based on coordinates

« on: August 08, 2023, 12:38:54 PM »

We have a permanent forest monitoring area with a full record of the tree population (tree species, GPS coordinates, diameter, height, etc.)
The area is regularly flown over with a multispectral drone. The elevation model (CHM) is generated manually after each flight. My question: Can the tree height determination also be automated using the known GPS points of the trees? What steps would this require?
I am aware that these can only be approximate values and cannot replace a terrestial recording!

2

Camera Calibration / Reflectance Panel - fixed values ​​vs excel list

« on: August 04, 2023, 11:36:38 AM »

Hello,

I'm interested in the topic of multispectral recordings and can't get any further on the reflectance panel point.

If i use a micasense or mapir panel, there is a large excel file with a wavelength column (1nm steps) and the associated value.
According to the operating instructions, the Sentera panel has a fixed value for each band.
Do you then enter the fixed values ​​manually in Metashape, while I simply import the Excel list for others? (See https://support.sentera.com/portal/api/kbArticles/280672000016519789/locale/en/attachments/nzgxb7ebaa6b2605e40c8949e960f24b16106/content?portalId=edbsndc49af6231b384d609b205eda12b95356310426ab79cfafc2949ad93d787da96&inline=true ; section 3.4)

Why are there such differences now? What does the table do and is one better or the other worse?
I look forward to any clarifying answer.