Environment and Sensor Configuration Effects on Image Sensor Performance for Turfgrass Data Collection. (5930)
Authors:
T. Fermanian - University of Illinois M. Schmidt* - John Deere
J. Reid - John Deere
Abstract:
New strategies exist for managing turf site variability. Reflectance sensors may be used for data collection in such strategies. The objective of this study was to
quantify sensor configuration and environmental factor effects on an image
reflectance sensor for characterizing turf anomalies. Placards in sizes of 1, 2.5, 10, and 15 cm2 for three different shapes (circle, triangle, square) were created to simulate anomalies. Placards were painted with 20, 35, and 65% calibrated gray paint and randomly located in the study area. Environmental study factors included canopy height, time of collection, and leaf moisture presence. Sensor configuration study factors included resolution, orientation, and platform speed. An image sensor was used to measure placard areas and distances apart using single factor tests for influences of environmental factors and sensor configurations. Area and distance measurements were categorized by size and reflectance and were compared to actual values. An interaction between reflectance and size was noted for area measurements in tall canopy turfs for both nadir and oblique sensor orientations.
Statistical differences in area measurements by size were noted for anomalies with low and high reflectance collected under oblique sensor angles, and with leaf moisture in a tall canopy turf.
Speaker Information: Mark Schmidt, John Deere, John Deere SEEC14401 Carowinds Blvd., Charlotte, NC 28241; Phone: 704.587.2111; E-mail:
Session Information: Tuesday, November 2, 2004, 1:00 PM-3:00 PM Presentation Start: 1:00 PM (Poster Board Number: 1508)
Keywords: image sensor; sensor configurations; sensing environment; turf sensing