Reed Qualification Based on Airborne Laser Scanning

Transcription

1 Reed Qualification Based on Airborne Laser Scanning Géza KIRÁLY, Gábor BROLLY, István MÁRKUS University of West Hungary, Faculty of Forestry, Department of Surveying and Remote Sensing H-9400 SOPRON, Bajcsy-Zs. u. 4.

2 Outline Introduction Materials Study Area Reference data Airborne Laser Scanning Methods Pre-processing Processing Results 2

3 Introduction Reeds are very precious habitats Should be qualified in every 5 years (Government Decree No. 22/1998. (II.13.)) CIR photo interpretation subjective ALS objective parameters 3

4 Materials Study Area Area of the Lake Fertő Lake Fertő / Neusiedler Country Land cover Area (km2 AT Reed 115 AT Water 132 AT Sum 247 HU Reed 62 HU Water 13 HU Sum 75 Sum 322 4

5 in pictures 5

6 Materials reference data Reed Classification Map 2007 W N S E Reed Classes I_ A I_ B II_ A II_ B III_ A III_ B IV_ A IV_ B V_ A V_ B Embankments Water Kilometers 6

7 GENESEE Project Geodetic survey of Lake Fertő and Hanság main channel Founded by the Austrian Hungarian Cross Border Cooperation Duration: Project partners: Lead Partner BOKU Wien (AT) PP1 ÉDUKÖVÍZIG Győr (HU) PP2 Amt der Burgenländischen Landesregierung, Abt.9 Wasser- und Abfallwirtschaft (AT) PP3 UWH, Dept. Of Surveying and Remote Sensing WP5 Airborne Laser Scanning 7

8 Airborne Laser Scanning Planning Geplannte ALS Gebiete im GENESEE Projekt 1 : Geplannte Gebiete Neusiedler See Einser-Kanal Vorige ALS Gebiete Administrative Grenze des Neusiedler Sees ~30.1 km2 ~92.6 km2 8

9 Airborne Laser Scanning Execution 06/12/2011, GeoService 9

10 Airborne Laser Scanning Execution cross stripes and reference planes 10

11 Airborne Laser Scanning Reference planes 11

12 Relative orientation of the strips Before 12

13 Relative orientation of the strips After 13

14 Relative orientation of the strips Before After 14

15 Methods Model creation DTM creation DSM creation ndsm Water delineation Echo Ratio Reed parameters Echo Ratio ndsm 15

16 Airborne Laser Scanning Digital Surface Model (DSM) - detail 16

17 Airborne Laser Scanning Digital Terrain Model (DTM) - detail 17

18 A Reed Island 18

19 Echo Ratio To delineate: vegetation (reed); water. To classify reed 19

20 Echo Ratio (100% - 50%) 20

21 normalised Digital Surface Model (ndsm) 21

22 Results Water delineation based on Echo Ratio 22

23 Results Water delineation based on Echo Ratio 23

24 Results Reed classification based on Echo Ratio 24

25 Results Reed classification based on ndsm 25

26 Results Reed classification based on Echo Ratio 26

27 Results Reed classification reference data 27

28 Results Reed classification based on Echo Ratio R 2 =0.76 Spatially much more detailed Resolution of the ER is a crucial parameter ndsm has much lower correlation (R 2 =0.43) 28

29 Future directions Creation of one parameter-set (vertical profile) describing the vertical distribution to improve the accuracy Involve imagery data to estimate health status of the reed Complex investigation of ALS and Imagery data Next aerial survey in 2015 (?) 29

30 Acknowledgement: GENESEE (AT-HU L00130) Thanks for Your Attention!!! Further information: