LiDAR remote sensing
In this module you will gain a detailed understanding of the advantages and challenges of Earth observation using Light Detection and Ranging (LiDAR) systems. Compared to other types of remote sensing data, the data from active Light Detection and Ranging (LiDAR) systems is of particular importance for local studies, where the 3D component (height) of objects is of relevance. Commonly LiDAR data is applied it in the field of digital terrain modelling, in forestry – e.g. for canopy height assessment, or urban structure applications. LiDAR embraces a range of active remote sensing systems mounted on different platforms, which provide valuable information for characterization of horizontal and vertical structure of the earth surface by measuring the travel time of laser pulses in visible and near-infrared spectral domains. The quality of scanning depends on the nature of the LIDAR system (discrete-return or full waveform) as well as on a set of other terrain- and data-driven factors. This course provides you with an overview on the theory and applications of LiDAR data, with a particular focus on airborne laser scanning. Following the initial theoretical sections on the principles and basic characteristics of LiDAR data, diverse practical steps and exercises will be implemented to provide real-world examples to illustrate how the LiDAR point clouds can be applied to extract information on terrain, surface and vegetation. These information will be further employed to model vegetation structural attributes on multiple spatial scales ranging from single trees to landscape levels.
Block 1: Introduction to LiDAR (how does laser scanning work?)
- Reminder on general remote sensing issues: difference between active and passive sensing
- History of LiDAR measurements
- Basics of LiDAR data measurements (platforms, sensors)
- Airborne vs. spaceborne LiDAR: history, applications and data access
- Measurement of travel time of laser light (pulsed time of flight)
- On the concept of “structure”: why a third dimension is crucial?
Block 2: Principles of LiDAR measurements
- Platform navigation, orientation and positioning
- Difference between types of data acquisitions: discrete return and echo waveform
- The recorded parameters: elevation, height, signal intensity and co.
- The concept of „single-pulse“ vs. „multiple-pulse“
- How are the incoming returns recorded? first come- first served!
- Terrestrial LiDAR measurement: one position, rotating scanner
- Data formats and big data-management: each byte matters!
Block 3: Elevation models:
- General thoughts: why are the elevation models essential?
- Digital terrain models
- Digital surface models
- Normalized DSM (Canopy height models)
- Application fields: Forest, landscape and habitat representations
- Magnified focus on Forest (basic and derived parameters): Diameter at breast height, height, tree type proportions, tree type mapping, crown closure, stem count, growing stock und aboveground biomass
- Single tree measurements
- Urban: City models, roof top and building footprints
Block 4: Exercises in Open-Source domain of LiDAR data processing (Fusion/LDV, LASTools, R)
- Exercises on point cloud processing
- Import, export, visualizations and rendering
- Sample measurements, single tree measurements and associated tasks
- Elevation models
- Data trimming, cropping, smoothing and generalizing
- Catalog and descriptive communication
- Extraction of metrics for modeling purposes
- Thoughts on metrics
- Intensity: yes or no?
- Multi-scale metric extraction
- Multi-source metric extraction
- Class works and workshops (CIP-Pool/Homework)
- Literature review, discussion groups and public presentations
Coding examples and individual work will be covered
Various software programs will be used, but mainly OpenSource software such as R.
Different techniques will be introduced and practically applied.
The content of scientific with regard to the audience will be discussed.
General Course News and Updates
Marcus Groll handed in his M.Sc. thesis "Deep learning for Instance Segmentation of bomb craters on historical aerial images of the Second World War " and will defend it next week. Abstract: During the Second World War (WWII) many air strikes were flown on German...read more
We congratulate Maninder who successfully defended his M.Sc. thesis “Comparing the performance of crop growth models using synthetic remote sensing data at DEMMIN, Germany” supervised by Martin Wegmann and Christopher Conrad.read more
Maninder Singh Dhillon handed in his M.Sc. "Comparing the performance of crop growth models using synthetic remote sensing data at DEMMIN, Germany" supervised by Thorsten Dahms with the first and second supervisors Martin Wegmann and Christopher Conrad, respectively....read more
Our EAGLEs in 2018 visited the German Aerospace Center, namely the Earth Observation Center, close to Munich. Various topics were presented by DLR scientist and the EAGLEs hat the chance to discuss various topics in small groups with individual scientists.read more
on Thursday, December 13th, at 12:30 we will have the following presentations in the student working room (Josef Martin Weg 52, 3rd floor): internship presentations: Johni Miah"Remote Sensing and Geographic Information System for Decision...read more
Web presence of you new EAGLE students is online. Our new 2018 EAGLE students created their own webspace in order to present the group and each student individually. Have a look who started EAGLE this year, read about their background and interests - and especially...read more
Congratulation to Jakob Schwalb-Willmann who successfully graduated today! His M.Sc. topic was "A deep learning movement prediction framework for identifying anomalies in animal-environment interactions" aiming to explore the potential of animal movement...read more
Our new EAGLEs arrived! We welcomed our new international EAGLE students from the US, Ecuador, Bangladesh, Ruanda or Germany for the upcoming winter term and introduced the lectures as well as the courses. In the evening we had a joint dinner to get to...read more
On Monday, 24th of September from 1:30 onwards the following EAGLE students will present their M.Sc. idea. Everybody is welcome to join their presentations and to provide feedback: Julia: "Time-Series Analysis of Sentinel-1 and Sentinel-2...read more
On Monday, 24th of September, at 1pm the following internship reports will be presented: Bharath: "Installation and Characterization of an imaging Spectrometer for the UAV-based remote sensing" Johannes: "Crop classification based on S1/S2 in...read more