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BSHC LIDAR S eminar SMA e xperiences from and future plans of LIDAR surveys PowerPoint Presentation
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BSHC LIDAR S eminar SMA e xperiences from and future plans of LIDAR surveys. SMA LIDAR surveys 1996-2002. System: HawkEye I Carrier: Helicopter Positioning : DGPS. Depth range : ~1-20 m Sounding density : ~5 per 5x5 m. LIDAR surveys along the coast of Skåne and Öland.

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Presentation Transcript
slide1

BSHC LIDAR Seminar

SMA experiencesfrom and

futureplans of LIDAR surveys

slide2

SMA LIDAR surveys 1996-2002

System: HawkEye I

Carrier: Helicopter

Positioning: DGPS

Depthrange: ~1-20 m

Soundingdensity: ~5 per 5x5 m

LIDAR surveysalong the coastof Skåne and Öland

LIDAR and multibeam surveys in the Stockholm archipelago, partly for the Navy

~6,6 km

~5 km

  • Common problems:
  • Any existing depths/contours shallowerthan the LIDAR-resultwerekept in the chart
  • HowtohandlesingleLIDAR soundingindicatingshallow spot
slide3

Recent LIDAR experiencesfrom the research program EMMA (EnvironmentalMapping and MonitoringwithAirborne laser and digital images on land and at sea)

Leftpicture: Multibeam Reson 7125 (2013), 1x1 m bin size. An enormousnumberof rocks/boulders.

Comparativesurfaces, ~1000x750 m, depthrange 2,5-11 m

Right picture: HawkeyeII (2010), 5x5 m bin size. In general, similarpictureof the seafloor as for the multibeam, except the total absenceof features/rocks. Gaps in data - no bottomreflect signal. Lowsoundingdensity -> low DTM resolution

slide4

EMMA results: Feature detection – LIDAR versus multibeam

Multibeam:

Averagedepth: ~6 m

Shallowestsounding: 2,75 m

Boulder: 5x5 m och 3 m high

Boulder: 3x3 m och 2,2 m high

Hawkeye II:

Shallowestsounding at boulder position: ~5 m, no signsofbottomreflection on the boulders, processed XYZ-data (no raw data toanalyze)

Purple points from multibeam

White points från Hawkeye II

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Future LIDAR plans…

  • Project Surveyingshallowwaters 2104-2015
  • By directionof MSB – Swedish Civil ContingenciesAgency
  • Project leader SMA Hans Öiås
  • To study:
  • Costeffective systems tomapshallowwaters < 10 m (coastal, lakes, rivers) towards the coastline
  • Analyze different acquisition techniques(LIDAR, echo-sounders)
  • Pros and cons: quality, costs, time, information
  • Survey plan on what system tousewhere
  • Practical fieldtrials