Permanent inventory sampling

Permanent inventory sampling

Activity TitlePermanent inventory sampling at 554 sampling points since 1989
Contact PersonChristoph Gollob
Duration of activities1989 - 
Funding agency/Project 
Equipment installed in the fieldLaserscanner
Brief description of activitiesTree detection and individual tree segmentation from laser scan data
Other relevant persons 

 

Modeled detection probabilities for different laser scanner installation variants. The laser beams emitted by the laser scanner cannot penetrate solid matter (tree trunks, branches, leaves, etc.). As the distance from the scanner increases, shadowing becomes more prevalent, resulting in a decrease in detection probability, i.e., the probability of overlooking objects increases with increasing distance from the scanner. This effect can be reduced by setting up the scanner in several positions. At WAFO, a statistical method was developed for modeling the detection probabilities of trees when using terrestrial laser scanning at forest inventory sampling points, which allows the scan positions to be selected in such a way that optimal coverage of the area is achieved.

​

  • vergrößern
    Ritter et al. (2020): Towards an Optimization of Sample Plot Size and Scanner Position Layout for Terrestrial Laser Scanning in Multi-Scan Mode. https://doi.org/10.3390/f11101099

Digitization of the Sample Inventory 2021

Activity TitleDigitization of the Sample Inventory 2021
Contact PersonChristoph Gollob
Duration of activities2021
Funding agency/Project 
Equipment installed in the field 
Brief description of activities:Sampling methods for digital forest inventories
Other relevant persons: 

Dendrometer

Dendrometer

Activity TitleDendrometer
Contact PersonChristoph Gollob
Duration of activities2011 - 
Funding agency/Project 
Equipment installed in the fieldDendrometer
Brief description of activitiesAutomatic tree species recognition
Other relevant persons 

https://doi.org/10.1139/cjfr-2017-0326

  • 2 Bilder
    Dendrometer
  • 2 Bilder
    Mean curves for cumulative diameter growth of dominant trees in Kreisbach, Rosalia

Digitalisation of the Forest Road Network

Digitalisation of the Forest Road Network

Monitoring forest roads with mobile laser scanning: automatic identification and measurement of cross sections.

Based on mobile laser scan data, 52 km of forest roads in the Rosalia teaching forest were digitized.

The resulting “digital twins” make it possible to obtain a wide variety of information about the forest roads, including their exact location, lane width, embankment slopes, etc.

 

Activity TitleDigitalisation of the Forest Road Network
Contact PersonChristoph Gollob
Duration of activities2023 -
Funding agency/Project 
Equipment installed in the field? If YES, where?Mobile Laser scanning unit
Brief description of activities:Monitoring forest roads with mobile laser scanning: automatic identification and measurement of cross sections.
Other relevant persons: 

 

 

 

Automatic detection of color markings on trees

Automatic detection of color markings on trees.

Foresters often mark trees with spray paint, e.g., to designate skid trails, mark trees for removal, or mark anchor trees for cable routes. At WAFO, in collaboration with FT, a method was developed that allows these markings to be automatically detected using laser scanning point clouds, thus digitizing the information stored by foresters in the forest.

Left: colored point cloud from the laser scanner. Center: detection of spray paint. Right: detection of individual symbols (numbers in this example).