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2021 RED RIVER BASIN LIDAR DATA COLLECTION
NEWSLETTER
LiDAR =Light Detection and Ranging is an integration of airborne laser and Global Position System technology. Laser pulses are directed at the earth’s surface (early spring or late fall) from equipment on an aircraft flying a predetermined grid over an area of interest. The laser reflections are recorded, and the range is calculated from the instrument’s orientation in space and the time required for the laser’s light reflection to travel back to the aircraft.
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what is lidar?
LiDAR provides detailed information on the elevation of the ground surface for predicting flood inundation from rivers. Detailed LiDAR measurements not only offer higher-resolution elevation data for floodplain modeling, but they also provide a source of high-resolution surface roughness information. This is useful as the RRWMB and its partners look at investing in future flood mitigation and habitat restoration projects.
How will new LiDAR data compare to data collected in 2008-2009? New technology provides for more accurate measurements. Data from 2008 and 2009 were collected prior to United State Geological Survey (USGS) data specification standards. These first-generation data had nominal point spacing 1/1.4 meters2and 15cm (6 inches) RMSEz accuracy. Data acquired in 2009 will meet or exceed USGS QL1 Base Specifications with nominal pulse density of 8/meter2and vertical accuracy of 10cm (3.9 inches). When will the new data be collected? The RRWMB has contracted with the Sanborn Mapping Company to collect QL1 (Quality Level 1) LiDAR data. Acquisition has begun as of October 2021 and will continue this fall depending upon leaf-off conditions and weather-related factors. Work is expected to be completed by late 2021 if conditions are favorable.
Why is this data important to collect?
costs
Who is paying for the LiDAR data collection and LiDAR derived products? The RRWMB is funding this LiDAR collect as a service to its member districts. Other watersheds and county areas not currently part of the RRWMB will be paying for their geographic area.
How much will it cost? LiDAR acquisition, processing, 3-years data hosting/maintenance, and derived products will cost approximately $2.3 million.
Where can LiDAR data products be obtained? The IWI will update the current IWI Map Portal at the following website: https://gisapps.iwinst.org/map-portal/. Raw LiDAR data, DEM’s, intensity images, building footprints, and point cloud data (tiled format) will be housed on Sanborn’s data portal system. Sanborn is providing this data hosting service to RRWMB member districts and add-on partners as part of the contract for a period of 3 years. To access these data when they are available, please contact the RRWMB.
What products will be derived from LiDAR data? The RRWMB has contracted with the International Water Institute for project management, data quality assurance, and derived products which includes a mosaicked bare-earth Digital Elevation Model (DEM), hydro-conditioned DEM (H3DEM+), and 1-foot contours. The IWI will deliver these data on portable hard drives to the RRWMB and add on area partners once data are ready/final for each RRWMB member district and add on areas. In addition to raw LiDAR data, Sanborn will be providingintensity images, low intensity ancillary images, building footprints, point cloud classification, and farmstead ring dikes/levee footprints.Data specification and products are identical to state and federal projects.
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Project Benefits
QL1 LiDAR data will enhance resiliency, capacity, performance, and efficiency at every level of decision-making. Benefits from LiDAR data include: More accurate flood plain maps to mitigate flood damages and to work towards flood and drought resiliency. Enhanced emergency preparedness. Targeted wetland and wildlife habitat restoration. Enhanced planning and project development related to transportation infrastructure, land use management, and human development. Enhanced understanding of river channel migration and slope stability. Detailed surface hydrologic and hydraulic modeling. Efficient/equitable natural resources management. Increased agricultural productivity. Innovative tools for conflict resolution. Problem identification. Major cost reduction in all civic projects.
where?
rob.sip@rrwmb.org
www.rrwmb.org
RRWMB
11 Fifth Ave E Ada MN 56510
Project area
The project area includes 20,034 square miles covering RRWMB member watershed districts (Bois de Sioux, Joe River, Middle-Snake -Tamarac Rivers, Red Lake, Roseau River, Two Rivers, and Wild Rice Watershed Districts) and the Sand Hill River and Buffalo Red River Watershed Districts. Counties included are Big Stone, Clearwater, Grant, Otter Tail, Stevens, and Traverse.
218-784-9500