Abstract
Reflectorless total station (RLTS) has made it possible for only one person to carry out field measurements and inaccessible points can be measured with relative ease. There is no sufficient information about the accuracy of these instruments for the long range measurements. This paper attempts to evaluate the accuracy of reflectorless distance measurements ranging up to 1000 m and to determine the surface area needed for such measurements at different incidence angles. An experiment was carried out to examine what effect surface material, target size and incidence angle had on distance measurement. In this experiment 10 different distances were measured using targets of 6 different materials and 4 different sizes at 5 different incidence angles. To properly evaluate the results, a special supporting base was designed and manufactured for holding the reflecting targets to ensure accuracy in the evaluation. Based on the accuracy analysis of a lot of testing results, the conclusions that were drawn indicated that the target size had a great effect on the accuracy if the incidence angle was between 15° and 30°.
Highlights
Total station is widely used to survey topography and monitor land form, land use, geomorphic change detection of rivers, streams, beaches and mass wasting of hill slopes [1]
Khalil reflectorless total station (RLTS) has made it possible for only one person to carry out field measurements and inaccessible points can be measured with relative ease, they become widely used by surveyors [2] [4] [7]-[10]
This paper studies the effect of target material, target size and incidence angle of laser beam on the accuracy of reflectorless measurements for distances up to 1000 m
Summary
Total station is widely used to survey topography and monitor land form, land use, geomorphic change detection of rivers, streams, beaches and mass wasting of hill slopes [1]. It is used in building construction layout [2], dynamic deformation of bridges [3], cultural heritage documentation [4] and many other engineering applications. In the 1990s, a powerful visible laser beam was used for measurements to almost any surface without the use of retroprisms [5]. Many of today’s total stations have integrated this reflectorless EDM technology [6]. (2015) Accuracy Evaluation of Long-Range Reflectorless Distance Measurement.
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