This project was funded by Grant 0924407 from the National Science Foundation’s Physical and Dynamic Meteorology Program. NCAR EOL In-situ Sensing Facility staff provided the tower data. NVIDIA Corporation provided a C2070 GPU card to perform the calculations.
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Because of the trenching and flooding of a nearby irrigation ditch after the installation of the lidar, one side of the lidar trailer occasionally stood in mud while the other side was on dry soil. Staff attempted to compensate for the sinking of the one side by periodically adjusting the leveling system. However, measurements and records were not kept. Note: a 1-mm change in the height of one side of the trailer may have resulted in a 0.5-m change in the height of the beam at the tower.
The central column of the tower was 32 cm wide. Guy wires 0.47 cm in diameter were attached to the tower at four heights on the tower. Guy wires from 7.9 and 18.8 m AGL were anchored into the ground 13.4 m from the tower base. Guy wires 23.8 and 32.0 m AGL were anchored into the ground 26.8 m from the base.
The transmitted beam falls entirely within the receiver’s field of view by approximately 500-m range.
The associated hard-target returns from these trees were located in a region near 1.50–1.65 km south and 0.35 km west of the lidar.
Given a pulse rate of 10 Hz, an angular scan rate of 4° s−1, and a digitizer speed of 100 megasamples per second, the number of data points in the native spherical coordinate system of the lidar fall into blocks that are 250 m × 250 m, 500 m × 500 m, 750 m × 750 m, and 1 km × 1 km, and centered on the VT are 3692, 14 885, 33 650, and 60 222, respectively. After interpolation to a Cartesian grid with spacing of 10 m in both east–west and north–south dimensions, the number of points (or pixels) in the blocks are 625, 2500, 5625, and 10 000, respectively.
Of the 500 m × 500 m block 78% was over orchard while the remaining northern 22% was over bare fields or relatively short crops, such as tomato plants. Of the 750 m × 750 m block 68% was over orchard and 32% was over nonorchard. The 1 km × 1 km block was 63% over orchard and 37% over nonorchard.