- StRATEGy graduate school
- University of Potsdam
- the US-National Science Foundation EarthCube RCN "Connecting the Earth Science and Cyberinfrastructure communities to advance the analysis of high resolution topography data"
- UP Transfer
In the past few years, the density and quality of point cloud data from lidar and photogrammetry has massively increased. This has enabled important new understanding in earth surface process science, but also has challenged our analytical tools and computational workflows. The generation of high resolution Digital Elevation Models, flow routing on point clouds, and surface roughness estimation has become more accessible and provides important measures of topography at the fine scale at which the processes operate. This workshop presents approaches to analyzing point cloud data and producing useful derived products. It also explores future applications in earth surface processes.
The workshop will progress from point cloud analysis to appropriate filtering and gridding and then geomorphic analysis on grids and point clouds. In addition, we will spend one day on explorations of full waveform analyses for a variety of applications as these data are progressively becoming more available and useful for bathymetric, vegetation, surface roughness measurements, and material property mapping.
This course is intended for graduate students and researchers with interests in surface processes and with experience in programming (Python and Matlab).
We will use this github website to share code and manuals and will continue to update and fill in (also during the workshop). A list of relevant documents and PDFs are available.
Workshop fees are 100 Euro. This includes snacks, coffee, beverages, lunch, and one workshop dinner on Monday. Thanks to support from the NSF EarthCube A^2HRT RCN, we will provide travel support for up to five early career participants from the US.
You can apply for the workshop online and the application deadline is August 23, 2019. We will inform selected participants and expect payment of the workshop fees until Sept 6, 2019. If no payment is received by then, we will offer the slot to another candidate.
There is a list of hotels and accomodation in Potsdam and Berlin. Public transport in Potsdam takes ~10 to 15 minutes to the Campus Golm, commuting via bike is also possible. Public transport takes you from Berlin downtown to the campus in 30 minutes.
If you are using your own laptop, please make sure to install the software packages listed in the PDF
Monday, Sept 30, 2019 start 9am
Introduction to Point Clouds (Bodo)
- Introduction to PC, classification, Transformation matrices, KDTress PDF of presentation
- Desktop based (Python driven) computational workflows (I) (Bodo + Aljoscha)
OpenTopography introduction and production implementations (Ramon and Chris)
- A few science motivators and lidar + SfM overview
- OpenTopography intro + review of basic processing workflows
- DEM processing for flow routing using TauDEM HPC
4 - 5pm Evening student presentations
Tuesday, October 1, 2019
- OpenTopography continued - hydraulogic routing, change detection, Community Dataspace; Other data sources: UNAVCO TLS, NEON, OpenAltimetry
- Desktop based (Python driven) computational workflows (II) (Aljoscha + Bodo)
- Point cloud classification and filtering and voxel-based approached (Python code voxel-classification-lidar.py and Python code voxel-classification-lidar.py), PDF manual, Etherpad Link
- interpolation to grids using the most appropriate methods (from triangulation to IDW and fitting green's functions and splines and other surfaces) github: Lidar_PC_interpolation
- Efficient computation with point clouds using python, cython, and KDTrees (Example for generating DEMs from dense pointclouds) github: LidarPC-KDTree, Etherpad KDTree, Python code Volumetric_Density_PC_KDTree, Python code plot_density_from_hdf
- Other topics depending on time and participant's interests
4 - 5 pm Evening student presentations
Wednesday, October 2, 2019
- Desktop based (Python driven) computational workflows (III) (Taylor + Aljoscha + Bodo)
Thursday, October 3, 2019
- Topographic analysis with LSD TopoTools (Fiona)
Friday, October 4, 2019
- Full waveform lidar explanation and exploration with specific applications for geomorphology PDF of introduction presentation (Bodo + Aljoscha)
- FWF data examples are in Golm-FWF and fwf-lidar-displaz-examples
- FWF processing workflow describing separate steps, including LAZ/WDP-to-ASCII conversion, interactive beam visualization of points and corresponding FWF data, spline smoothing and interpolation, peak finding and generation of denser point cloud, Gaussian fitting to signals and extraction of amplitude and width of fitted signal, and some comments on PulseWave files PDF document with links to source codes and description, Etherpad Link
Evening student presentations We will have short presentations by participants on Monday and Tuesday early evenings. You are STRONGLY encouraged to make one of these short (<5 minutes/<5 slides) presentations. We will have a computer and projector there and will collect the presentations in advance for quick transitions. Given the big group, we will be strict on timing, but we do look forward to hearing about your work, your ideas, or even questions. This will be very informal!