1 / 32

Management and Use of LiDAR-Derived Information Elizabeth Cook USDA-NRCS Columbia, MO

Management and Use of LiDAR-Derived Information Elizabeth Cook USDA-NRCS Columbia, MO. Now What?. Study Area. Project Deliverables. LAS mass point files, all returns, with and without breaklines, qq quad tiles 1-m ESRI Grid bare earth DEM files, quad and qq quad tiles

guy-william
Download Presentation

Management and Use of LiDAR-Derived Information Elizabeth Cook USDA-NRCS Columbia, MO

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Management and Use of LiDAR-Derived Information Elizabeth Cook USDA-NRCS Columbia, MO

  2. Now What?

  3. Study Area

  4. Project Deliverables • LAS mass point files, all returns, with and without breaklines, qq quad tiles • 1-m ESRI Grid bare earth DEM files, quad and qq quad tiles • 1-foot pixel natural color digital orthophotos in geotiff, ecw and sid formats (collected with LiDAR and used for breakline mapping) • Independent control points for QA • Misc shapefiles – tile indexes, breaklines

  5. Total for 4-county project area Grid DEMs 31.4 gb LAS 92 gb Imagery 261.2 gb (one format or version of the data) One 7.5-minute quad Grid DEM – 585 mb LAS 1.8 gb Imagery 4.6 gb Data Management – File Sizes

  6. Data Management – Formats, Areas of Coverage, Products • Method 1 – deliver “raw” data, such as LAS, ASCII mass point files or ESRI terrains; users clip to areas of interest and process derivatives • Method 2 – deliver tiles of derivatives according to anticipated users needs • Method 3 – deliver some derivatives, but customize as necessary, and let high-end users process their own

  7. Data Formats – “Raw” • LAS – industry standard binary file of x,y,z,i (and more) data • not many softwares read (changing fast) • may want to generalize, sample per class, etc • ASCII x,y,z • large and slow • ESRI Terrain – multi-resolution database object that “stages” the data for subset, generalization and derivatives • requires knowledgeable users • lots of time to create

  8. Terrain visualized as a TIN; resolution based on scale of display and pyramid levels of terrain

  9. Derivative Data from LiDAR • Digital Elevation Model (bare-earth raster) • Digital Surface Model (with canopy) • Hillshade • TIN – ESRI vs. CAD • Contours All are 2-D representations of terrain

  10. Applications to Conservation Planning

  11. LiDAR data can speed design time by eliminating much of the field survey. • This dam was designed in 15 minutes without ever going to the field.

  12. Improving Soil Map Unit Boundaries

  13. Standard 10m DEM from hypsography

  14. 1m LiDAR

  15. Flooding Frequency Interp. Soils

  16. Using LiDAR First Returns

  17. Extract first return LiDAR points • Low-pass filter to generalize • Polygonize for forest/non-forest layer (red mask)

  18. Helping People Help the Land The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer.

More Related