ADVANCED DTM GENERATION USING AIRBORNE LIDAR TECHNIQUE
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Covasnianu AdrianSeguir
31 de Dec de 2008•0 recomendaciones•1,517 vistas
ADVANCED DTM GENERATION USING AIRBORNE LIDAR TECHNIQUE
31 de Dec de 2008•0 recomendaciones•1,517 vistas
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Simulations of the hydrological risks and thus the decisions of assessment strategies are crucial in the context of extreme meteorological events due to the consequences of the fast changes in the climate. The remote sensing methods, such as LIDAR backscatter technique are allowing the elaboration of a high precision (5cm vertical and 3 points/m2 horizontal resolutions) Digital Terrain Model (DTM) as basis of the hydrological modeling. In this paper is presented the airborne LIDAR technique, methodology of obtaining the DTM, the usefulness of the DTM outputs for hydrologic applications and the potential application for the Romanian Danube Flood Plain assessment strategy.
Covasnianu AdrianSeguir
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ADVANCED DTM GENERATION USING AIRBORNE LIDAR TECHNIQUE
- 1. ADVANCED DTM GENERATION USING AIRBORNE LIDAR TECHNIQUE A. Covasnianu , M.M. Cazacu, I. Balin contact: adrian.covasnianu@enviroscopy.com 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008 INCDD Tulcea
- 3. LIDAR ( Li ght D etection and R anging) R ADAR : radio waves are transmited into atmos phere , which spreads a part of the energy back to the radar’s receiver LIDAR : transmits and receives electromagnetical radiation, but of a higher frequency ( from UV , VIZ and IR ) 1. What is LIDAR? 1st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008
- 5. 3. The principle of airborne LIDAR technique Echo signals resulting from different types of targets LIDAR sensors, used for topographic applications operate in the near infrared band. Unlike photogrammetry, LIDAR data collection is not affected by sun angle and does not require collection to be performed in late fall or early spring for leaf-off conditions 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008 Airborne Laser Scanner – RIEGL LMS Q560
- 7. 3. The principle of airborne LIDAR technique GPS corrections in real time from the satelites Laser scanning GPS reference station with double frequency GPS in double frequence GPS navigation system in real time Inertial device 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008
- 12. Airborne LIDAR PartenAvia (Apei SA) 4-5 pts/m2 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008 DTM-LIDAR flight parameters Value Flight alltitude 450 m Speed flight 45 m/s Band width 520 m Lateral coverage b ands/Overlapping 20% Distance between bands 415 m Laser emmision frequency 65 kHz Scanning angle 60 0 (+/ - 10 0 ) Scanning frequency 75 Hz (Standard deviation) total planimetric precision of the measured laser points 20 cm Medium density of laser points 2.8 pts / m 2 Medium distance between laser points (flight direction and perpendicular) 0,6 m
- 13. Flight tracks along the Danube river-Romanian section of the river We are here! 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008
- 14. Flight tracks 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008
- 15. 1st Internation Symposium of technical geography-CJ 30-31th of May 2008 Examples from the REELD 2007 campaign Case Study: REELD EXAMPLE – May 2007
- 16. Case Study: REELD EXAMPLE – May 2007 GALATI SHIPYARD Digital terrain model (DTM) Pure ground TULCEA County Buildings Danube planted forest Defence Dam Trees
- 17. TOPOGRAPHICAL PROFILES -EXAMPLES 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008
- 18. QUANTITATIVE DATA Profile -Channel (transversal) Profile Danube (transversal) Profile Channel (longitudinal) 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008
- 19. More data… Bands from LIDAR: length of 15 km and width of 500 meters each The intensity of LIDAR signal’s echo ( „albedo” ) . D a n ube - black colour in the left, that means lack of LIDAR signal. Altitude- Danube in black colour, the higher areas – green to red. Altitude class- low vegetation DTM- see clearly the Danube, the hills
- 20. Balta Crapina - localisation 1 st International Symposium of Technical Geography-Cluj Napoca 30-31th of May 2008
- 21. 9. Simulation of hydrological flood- Balta Crapina Crapina Area- Courtesy of INCDD Tulcea
Notas del editor
- « L’environnement est actuellement un sujet incontournable se situant au carrefour des intérêts du monde économique – politique - financier et social avec des implications majeures allant de l’échelle des intérêts individuelles jusque à l’échelle planétaire. La pollution environnementale et le changement climatique, avec leurs conséquences possibles dans le développement des phénomènes extrêmes (incendies, inondations, fonte des glaciers, vagues de chaleur, tempêtes,…) engendrent des déséquilibres économiques et sociales ayant des enjeux majeurs concernent tout individu, institution et nation » Dans ce contexte EnviroScopY SA ( ESYCH) est une nouvelle entreprise crée le 08.03.2006 ayant son savoir faire général dans le domaine des Sciences – Technologies - Management de l’Environnement , son métier dans le domaine de la Qualité de l’Air et sa vocation de créateur tant des Instruments High -Tech de monitoring des paramètres atmosphériques que des Modèles Complexes de Simulation comme aide à la décision des stratégies d’abattement. ESYCH s’adresse aux institutions impliquées de manière responsable dans l’assurance de la qualité de l’air ( et de l’environnement en général) qui ont besoin d’un support spécialisé (conseil), d’un partenaire de projet ou qui cherche de mesures et études avec des instruments et outils de modélisation complémentaires plus représentatives que celle actuelles. Les problématiques de l’ ozone en été et celle des poussières fines en hiver son pleinement visées. Les références de l’ ESYCH sont l’équipe des professionnels reconnus, l’ expérience et les publications attestant déjà l’utilisation avec succès des techniques et des outils proposées sur le terrain dans plusieurs projets effectués dans plusieurs pays. Au partenaire principal l’École Polytechnique de Lausanne (les laboratoires LPAS & EFLUM) s’ajoute un le CSEM (Centre Suisse d’Electronique et Microélectronique) , le parc scientifique de l’EPFL ( PSE ), et autres à l’étranger. Les opportunités de projets se situent tant en Suisse que à l’étranger dans le contexte du changement climatique et sa relation directe avec la pollution de l’air .