Uses of Geospatial Soils & Surface Measurement Data in DWR Delta Levee Program Joel Dudas

Delta Risk Management Strategy

Uses GPS and inertial measurement unit (IMU) to accurately position the plane and map the surface LIDAR

SPECIFICATIONS  Vertical accuracy: 95% at 0.6’ (<18.5cm) and 90% at 0.5’ (15cm)  Horizontal accuracy: 1.0’ (30cm), 1 sigma.  Spot spacing:.8 meter nominal Ground Sampling Density  Grid posting:1 meter  Horizontal Coordinate System: UTM Zone 10, NAD83  Vertical Datum: NAVD 88  DistributionPublic domain DELIVERABLES Raw data “point clouds” Processed bare earth data, grids and points Canopy “first return” files Smoothed and raw 1-foot contours & breaklines Intensity images Control files Accuracy/quality assessment reports Mutiple formats: ASCII, ESRI geoDB, ESRI grid,.las, geotiff,.dwg

More About LiDAR  Status: Currently working on 2 nd delivery of reflight data  Public data  Fully documented  Available via ftp or direct hard drive transfer  Current full dataset (including all formats and archives from initial flight): 1.32 TB  Final dataset: ~1.50 TB

Delta Levees Program – Uses of DEMs for Levees

Delta Levees Program – Uses of DEMs for Habitat

Delta Levees Program – Uses of DEMs for Subsidence Monitoring & Management

Delta Levees Program – Uses of DEMs for Emergency Response

UAVSAR ParameterValue FrequencyL-Band to MHz Bandwidth80 MHz Resolution1.67 m Range, 0.8 m Azimuth PolarizationFull Quad-Polarization ADC 12 bit ADC with selectable Bit Floating Point Quantization compression to 2, 4, 6, 8, 10 or 12 bits; 180 MHz sampling frequency WaveformNominal Chirp/Arbitrary Waveform Antenna Aperture0.5 m range/1.5 m azimuth (electrical) Azimuth Steering Greater than ±20° Transmit Power> 3.1 kW Polarization Isolation <-25 dB UAVSAR is a portable, pod-based, synthetic aperture radar (SAR) system instrumented with a phased array, polarimetric, L-band antenna. It is designed to support a wide range of science investigations including geology, vegetation mapping and land use classification, archeological research, soil moisture mapping, subsidence/uplift measurement and cold land processes. The UAVSAR radar and aircraft are specially designed for repeat pass interferometric measurements to detect changes in the location of observed surface features.

Surface Change Detection with Radar Interferometry When two observations are made from the same location in space but at different times, the radar phase change (interferometric phase) is directly proportional to the change in the range to a surface feature. Surface Deformation of the 1999 Hector Mine Earthquake

Precision Autopilot Repeat Pass Baseline The Precision Autopilot System was designed and developed at Dryden Flight Research Center. Overall, the PPA maintains the planned flight path within a 5 m tube nearly % of the time. The requirement on tracking is to maintain a 10 m tube for >90% of the flight track under light turbulence conditions.

PolSAR: LHH=red LHV=green LVV=blue

Delta Levees Program – Uses of DEMs for Emergency Response Questions: