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Building High-Resolution DEMs and WBDs from Overlapping LiDAR Point Clouds

Building High-Resolution DEMs and WBDs from Overlapping LiDAR Point Clouds. Jeffrey L. Hoffman & Seth Hackman NJ Department of Environmental Protection. AWRA Spring Specialty Conference GIS and Water Resources VII March 26-28, 2012. 8-digit hydrologic units HU8s – 12 1:100,000?

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Building High-Resolution DEMs and WBDs from Overlapping LiDAR Point Clouds

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  1. Building High-Resolution DEMs and WBDs fromOverlapping LiDAR Point Clouds Jeffrey L. Hoffman & Seth Hackman NJ Department of Environmental Protection AWRA Spring Specialty Conference GIS and Water Resources VII March 26-28, 2012

  2. 8-digit hydrologic units HU8s – 12 1:100,000? USGS, 1974

  3. 11- & 14- digit HUs HU11s – 150 HU14s – 921 1:24,000 USGS, 1995

  4. New Hydrography 1:2,400 2002 – 2010 Now available on NHD!

  5. 12-digit HUs HU12s – 273 1:24,000 elevation, 1:2,400 hydrography EPA, 2009

  6. GOAL: New 14-digit HUs 1:2,400 elevation 1:2,400 hydrography

  7. Watershed Management Areas NJDEP 2000 WMAs WMA #11

  8. Need a DEM. But different LiDAR collections with different DEMs.

  9. LiDARCoverages Highlands( 2007, 5 feet) Hunterdon (2006, 10 feet) Southern Monmouth (2004, 3 meter) • Mercer • (2009, 1 meter)

  10. Overlap Areas – Difference Grid

  11. Composite 3-meter DEM

  12. new NHD hydrography • new DEM • old HU14s

  13. Burn In: • connectors • pipelines • conduits

  14. Recondition Fill Sinks

  15. Flow Direction Flow Accumulation Stream Grid Stream Link Drainage Network

  16. Drainage Network & Catchment Polygons

  17. QAQC - reality check NHD lines old HU14s pour points aerials drain lines catchment Add more pipelines where needed. Return to burn-in step. When perfect, stop.

  18. New HUC14s

  19. new NHD • new DEM • new HU14s

  20. Old HU14 New HU14s show ~400 acres drains northeast to Raritan River, not southwest to the Delaware River. New HU14

  21. What’s Next? • Raise funding • Now building a statewide 10’ DEM • Remaining 19 WMAs

  22. What’s Next? • PA & NY HUs • renumbering

  23. What’s Next? • Tidal areas • Low relief

  24. What’s Next? • Meet WBD standards • Rebuild HU8s and HU12s as necessary • Submit to WBD

  25. Questions?

  26. 2-Digit HUs USGS WSP 2294, 1987

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