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<resTitle Sync="FALSE">SCWA_RussianRiver_Lidar_Highest_Hit_2021</resTitle>
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<idPurp>Provide high resolution surface elevation data from the Russian River dataset.</idPurp>
<idAbs>&lt;div style='text-align:Left;'&gt;&lt;div&gt;&lt;div&gt;&lt;p&gt;&lt;span&gt;The highest hit digital surface model (DSM) represents the earth's surface elevation with all natural and anthropogenic features included. It was derived from NIR Lidar data using the highest hit method. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water). The horizontal datum for this dataset is NAD83 (2011), the vertical datum is NAVD88, Geoid 18, and the data is projected in California State Plane, Zone 2. Units are in US Survey Feet. NV5 Geospatial collected the Russian River Lidar data for Sonoma County Water Agency on 01/23/2021.&lt;/span&gt;&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;</idAbs>
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<keyword>anthropogenic structures</keyword>
<keyword>Sonoma County</keyword>
<keyword>California</keyword>
<keyword>Healdsburg</keyword>
<keyword>Geyserville</keyword>
<keyword>Cloverdale</keyword>
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<rpIndName>Carlos Diaz</rpIndName>
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<delPoint>404 Aviation Blvd</delPoint>
<city>Santa Rosa</city>
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<useLimit>Please contact Sonoma County Water Agency for information regarding the use of this data.</useLimit>
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<useLimit>&lt;div style='text-align:Left;'&gt;&lt;div&gt;&lt;div&gt;&lt;p&gt;&lt;span&gt;Elevation values for open water surfaces should be considered approximate due to the increase of laser noise seen over water, frequent lack of returns, and the overall dynamic nature of water.&lt;/span&gt;&lt;/p&gt;&lt;p style='text-align:Justify;font-weight:bold;margin:8 0 8 0;'&gt;&lt;span&gt;&lt;span&gt;SUBJECT: PUBLIC INFORMATION REQUEST &lt;/span&gt;&lt;/span&gt;&lt;span&gt;&lt;span&gt;–&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&lt;span&gt;LiDAR Data&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style='text-align:Justify;margin:8 0 8 0;'&gt;&lt;span&gt;&lt;span&gt;The attached information was retrieved from Sonoma County Water Agency CAD-Drafting/GIS Records in connection with a Request for Public Information. These records and the drawings upon which they are based, were produced or conducted solely for the technical and/or functional needs and purposes of the Sonoma County Water Agency and/or other entities which it now acts, or may have acted on behalf of in the past. &lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style='text-align:Justify;margin:8 0 8 0;'&gt;&lt;span&gt;&lt;span&gt;The Sonoma County Water Agency makes no assertions or representations regarding the sufficiency, accuracy or applicability of the information and/or records provided for any purpose beyond that for which they were originally produced.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p style='text-align:Justify;margin:8 0 8 0;'&gt;&lt;span&gt;&lt;span&gt;The information contained herein is for the use and information of the party to whom it was directly sent. The redis&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&lt;span&gt;tribution or “sharing”&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&lt;span&gt;of this information is strictly prohibited. &lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span /&gt;&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;</useLimit>
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<measDesc>Lidar data has been collected and processed for all areas within the project study area.</measDesc>
<evalMethDesc>Flight plans are designed with sufficient sidelap to ensure there are no gaps between flightlines. Shaded relief images have been visually inspected for gaps. </evalMethDesc>
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<measDesc>Shaded relief images have been visually inspected for data errors such as pits, border artifacts, and shifting. Lidar flightlines have been examined to ensure consistent elevation values across overlapping flightlines. The Root Mean Square Error (RMSE) of line to line relative accuracy for this dataset is 0.045 ft (0.014 m). Please see the Lidar data report for a discussion of the statistics related to this dataset.</measDesc>
<evalMethDesc>Data was examined at a 1:2000 scale. Relative accuracy of the flightlines was assessed in Microstation using TerraMatch. </evalMethDesc>
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<measDesc>The Non-vegetated Vertical Accuracy (NVA) of this dataset, tested at 95% confidence level is 0.223 ft (0.068 m). Please see the Lidar data report for a discussion of the statistics related to this dataset.</measDesc>
<evalMethDesc>Non-vegetated Vertical Accuracy was assessed using 22 ground check points. These check points were not used in the calibration or post processing of the Lidar point cloud data. </evalMethDesc>
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<quanVal>0.223 ft (0.068 m)</quanVal>
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<measDesc>The Vegetated Vertical Accuracy (VVA) of this dataset, evaluated at the 95th percentile is 0.480 ft (0.146 m). Please see the Lidar data report for a discussion of the statistics related to this dataset.</measDesc>
<evalMethDesc>Vegetated Vertical Accuracy was assessed using 29 VVA check points. These check points were not used in the calibration or post processing of the Lidar point cloud data. </evalMethDesc>
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<quanVal>0.480 ft (0.146 m)</quanVal>
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<stepDesc>Acquisition. NV5 Geospatial collected the Russian River Lidar data on 01/23/2021. The survey used a Riegl 1560i laser system mounted in a Cessna Caravan. Ground level GPS and aircraft IMU were collected during the flight. Sensor: Riegl 1560i
Maximum returns: 15
Nominal pulse density: ≥ 15 pulses/m^2
Nominal pulse spacing: 0.26 m
AGL: 1,578 m
Speed: 145 knots
FOV: 58.5°
Scan frequency: Uniform Point Spacing
Pulse rate: 1,000 kHz
Pulse duration: 3 ns
Pulse width: 28.4 cm
Wavelength: 1,064 nm
Pulses in air mode: Multiple Times Around
Beam divergence: 0.18 mrads
Swath width: 4,611 m
Overlap: 55%
</stepDesc>
<stepDateTm>2021-01-23</stepDateTm>
</prcStep>
<prcStep>
<stepDesc>1. Flightlines and data were reviewed to ensure complete coverage of the study area and positional accuracy of the laser points. 2. Laser point return coordinates were computed using POSpac MMS v.8.4 and RiProcess v1.8.5 software based on independent data from the Lidar system, IMU, and aircraft. 3. The raw Lidar file was assembled into flightlines per return with each point having an associated x, y, and z coordinate. 4. Visual inspection of swath to swath laser point consistencies within the study area were used to perform manual refinements of system alignment. 5. Custom algorithms were designed to evaluate points between adjacent flightlines. Automated system alignment was computed based upon randomly selected swath to swath accuracy measurements that consider elevation, slope, and intensities. Specifically, refinement in the combination of system pitch, roll, and yaw offset parameters optimize internal consistency. 6. Noise (e.g., pits and birds) was filtered using post-processing software, based on known elevation ranges and included the removal of any cycle slips. 7. Using TerraScan and Microstation, ground classifications utilized custom settings appropriate to the study area. 8. The corrected and filtered return points were compared to the ground survey points collected to verify the vertical accuracy. 9. The highest hit algorithm was used to create this highest hit DSM.</stepDesc>
<stepDateTm>2021-03-03</stepDateTm>
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<measDesc>Vertical accuracy was also assessed using ground control points that were used in the calibration and post processing of the Lidar point cloud as they still serve as a good indication of the overall accuracy of the Lidar dataset. The Root Mean Square Error (RMSE) of the vertical accuracy of the Lidar dataset as compared to ground control points is 0.1 ft (0.03 m). Please see the Lidar data report for a discussion of the statistics related to this dataset.</measDesc>
<evalMethDesc>12 ground control points were collected and utilized in the calibration and post processing of the Lidar data point cloud.</evalMethDesc>
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