GI3691 Airborne and Terrestrial Laser Mapping Syllabus:

GI3691 Airborne and Terrestrial Laser Mapping Syllabus – Anna University Regulation 2021

COURSE OBJECTIVE:

 To introduce the concepts of Space Borne, Air Borne, Terrestrial and Bathymetric LASER Scanners for Topographic and Bathymetric Mapping

UNIT I SPACE BORNE RADAR AND LIDAR ALTIMETER

Principle and Properties of LASER- Production of Laser – Components of LASER – LiDAR – Types of LiDAR:Range Finder, DIAL and Doppler LiDAR – Platforms: Terrestrial, Airborne and Space borne LiDAR – Space Borne LiDAR Missions – Space Borne Radar Altimeter for mapping Sea Surface Topography , Moon Topography – Merits of ALS in comparison to Levelling, echo sounding, GPS leveling, Photogrammetry and Interferometry

UNIT II AIRBORNE LASER SCANNERS

Airborne Topographic Laser Scanner – Ranging Principle – Pulse Laser and Continuous Wave Laser –First Return and Last Return – Ellipsoidal and Geoidal Height – Typical parameters of Airborne Laser Scanner (ALS) – Specifications of Commercial ALS –- Components of ALS – GPS, IMU, LASER Scanner, Imaging Device, Hardware and Software – Various Scanning Mechanisms: Oscillating Mirror, Rotating Polygon, Nutating Mirror, Fibre Optic

UNIT III DATA ACQUISITION AND PRE-PROCESSING

Laser Classification – Class I to Class IV Laser – Eye Safety – Synchronization of GPS, IMU and ALS Data -Reflectivity of terrain objects –- Flight Planning – Determination of various data acquisition parameters – Swath Width, Point Density, No. of Strips, Area Covered, Point Spacing – Data Processing – Determination of optimal flight trajectory- Quality Assurance

UNIT IV POST PROCESSING of LiDAR Data

Post Processing – Geo location of Laser Foot Prints – Various Co-ordinate Transformations involved Filtering – Ground Point filtering – Digital Surface Model and Digital Elevation Model – LIDAR data file formats – LAS File format and other proprietary file formats – Post Processing Software: Open Source and COTS Software – Quality Control Measures – Error Budget – Overview of LIDAR Applications in various domains – 3D city models – Corridor Mapping Applications – Forestry Applications.

UNIT V TERRESTRIAL LASER SCANNERS

Terrestrial Laser Scanners (TLS) – Working Principle – Static TLS – Dynamic TLS – Commercial TLS Specifications – Mobile Mapping Lasers :Vehicle Mounted TLS, Back Pack Wearable Laser Scanners – Asset Management Studies – Highways and Railway Asset Management – Indoor Mapping : Laser Scanning of interior of buildings/monuments – Immersive Applications – BIM Model – Applications in Tunnel Surveying, Forest Inventory, Open Cast Mine Surveying

TOTAL: 45 PERIODS
COURSE OUTCOMES:

On completion of the course, the student is expected to
CO1 Understand the components of laser and various platforms of laser scanning
CO2 Summarize the components of Airborne Laser Scanner and concept of ranging principles
CO3 Analyse the flight planning parameters and pre-processing of acquired data
CO4 Post process the data to derive DSM and DEM and its applications
CO5 Understand the components of TLS and its applications

TEXTBOOKS:

1. Jie Shan, Charles K. Toth, “Topographic Laser Ranging and Scanning – Principles and Processing”, 2nd Edition, CRC Press Publication, March 2018. ISBN: 9781498772273.

REFERENCES:

1. George Vosselman and Hans-Gerd Maas, Airborne and Terrestrial Laser Scanning, Whittles Publishing, 2010
2. Matti Maltamo, Erik Næsset, JariVauhkonen, Forestry Applications of Airborne Laser Scanning-Concepts and Case Studies, Springer, Dordrecht , 2016,Reprint Edition. ISBN 978-94-017-8662-1
3. Michael Renslow, Manual of Airborne Topographic LiDAR, The American Society for Photogrammetry and Remote Sensing, 2013