A Vehicle-Based Laser System for High-Resolution DEM Development – Performance in Micro-topography Measurement

Canadian Biosystems Engineering

article

Peng Li¹  Naiqian Zhang¹  Larry E. Wagner²  Fred Fox²  Darrell Oard¹  Hubert Lagae²  Mingqiang Han¹ 

[1] Department of Biological and Agriculture Engineering, Kansas State University;USDA-Agricultural Research Service

关键词: DEM;    Interpolation;    Image Matching;    3D;    Laser LineScanner;   

DOI  :  10.7451/CBE.2021.63.2.33

学科分类：农业科学（综合）

来源: Canadian Society of Agricultural Engineering

【 摘 要 】

A vehicle-based laser measurement system was developed tomeasure the surface microtopography and to generate highresolution digital elevation models (DEM). The accuracy of thesystem in microtopography measurement was evaluated in thelaboratory by comparing the DEM data generated by this systemwith that generated by a more accurate, stationary laser profilemeter for several surfaces, including an artificial sand-stoneridged surface. DEM data was created by interpolating the 3D rawdata into a regular, square grid using a two-dimensional, distanceweighted interpolation algorithm. The DEMs were comparedusing an image-matching method to calculate the correlationcoefficient. A test to study the effect of ambient light on elevationmeasurement under indoor and outdoor environments was alsoconducted.Correlation coefficients greater than 0.935 were achievedbetween the DEMs measured by the vehicle-based system and thestationary laser profile meter. The correlation coefficients amongthe four replications of the DEMs measured by the vehicle-basedsystem were greater than 0.988, indicating that the vehicle-basedlaser system can provide consistent elevation measurements.Correlation coefficients among the DEMs of the sand-stone-ridgedsurface measured by the vehicle-based system at different times ofthe day and under different indoor fluorescent lighting conditionswere all above 0.982. Correlation coefficients among DEMs takenat different times of the day and under different outdoor sunlightconditions were all above 0.971. These results indicated thatneither the fluorescent light nor the sunlight had a significant effecton the measurements obtained by the vehicle-based laser system.The system provided consistent elevation measurements underboth indoor and outdoor lighting conditions.

【 授权许可】

CC BY