Abstract
The design and evaluation of an automated, noncontact microrelief meter for measuring soil surface elevationsunder field conditions are presented. Key factors in the design of the meter are measurement accuracy, datacollection speed,and portability. Surface elevations are measured by determining the location of a laser line using imageprocessingtechniques. The accuracy was evaluated using blocks of known dimensions. Measurement errors in the x, y and z directionswere approximately <u>=</u> 0.25 mm, <u>=</u> 1.5 mm, and <u>=</u> 0.5 mm, respectively. These errors include those caused by the resolutionlimitations of the imageprocessing system, shaft encoders, as well as mechanical errors caused by the deflection of thesupport frame. The system was used to gather microtopography data from field erosion plots. The microrelief meter was ableto gather more than 650,000 elevation data values in approximately two hours. Overall, the system was well suited for fieldtopography measurements.
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