basics of levelling uses of levelling in the context of tidal measurements levelling is used for the following purposes referencing of tide gauges to determine and check the vertical stability ...
Filetype PDF | Posted on 16 Sep 2022 | 3 years ago
The words contained in this file might help you see if this file matches what you are looking for:
...Basics of levelling uses in the context tidal measurements is used for following purposes referencing tide gauges to determine and check vertical stability gauge bench mark tgbm with respect reference points benchmarks its immediate vicinity order isolate any local movements there should be at least three such repeated on an annual or semi basis connection gps regional separate sea level rise from crustal motion connected via stations fixed a global co ordinate system generally speaking antenna cannot directly placed point must established short distance away this by national network mean define datums surveying mapping hence will also allow all each other providing information spatial variations principle differential provides means accurately measuring height differences between some tens metres apart set up tripod levelled so that line sight horizontal graduated staff held vertically over first reading made intersection cross hair image backsight b same identical then second further...