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Določitev novozapadlega snega iz meritev laserskega merilnika snežne odeje
ID Žagar, Urban (Author), ID Skok, Gregor (Mentor) More about this mentor... This link opens in a new window, ID Demšar, Miha (Comentor), ID Dvoršek, Damjan (Comentor)

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Abstract
Merjenje višine snega se v zadnjih nekaj leti precej spreminja, od klasičnega merjenja z opazovalcem smo prešli na samodejen način, ko vse več postaj uporablja za merjenje višine snega laserske merilnike. Pomanjkljivost teh merilnikov pa je, da ne merijo neposredno višine novozapadlega snega. Do sedaj so to težavo nadomeščali z merjenjem razlike skupne višine snega med dvema zaporednima dnevoma, kar pa ni najnatančnejše in je le okviren približek. Zato smo na Agenciji republike Slovenije za okolje (ARSO) pripravili metodo, ki nam poda boljšo oceno višine novega snega, ki upošteva meteorološke parametre. Metoda je osnovana na strojnem učenju in je bila razvita v programskem jeziku Python s pomočjo knjižnice sklearn, pri čemer smo uporabili algoritem multiple polinomske regresije. V primerjavi z do sedaj uporabljeno metodo razlike, nova metoda absolutne povprečne napake izboljša tudi za več kot 20%. Metoda najbolje deluje za primere, ko so bile na postaji zabeležene izključno padavine v trdni obliki. Ocenjena višina novega snega se tako lahko uporabi za lokacije, kjer nimamo klasične meritve novozapadlega snega ali pa za kontrolo podatkov, kjer se višina meri.

Language:Slovenian
Keywords:novozapadli sneg, padavine, merilnik snega, korelacija, napaka, meritev, metoda
Work type:Final paper
Typology:2.11 - Undergraduate Thesis
Organization:FMF - Faculty of Mathematics and Physics
Year:2020
PID:20.500.12556/RUL-120397 This link opens in a new window
COBISS.SI-ID:31346179 This link opens in a new window
Publication date in RUL:19.09.2020
Views:1573
Downloads:255
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Secondary language

Language:English
Title:Determination of newly fallen snow from measurements of laser snow depth sensor
Abstract:
Snow height measurement has changed considerably in the last few years from the classic measurement with an observer to the automatic mode, where more and more stations use laser based instruments to measure snow height. However, the disadvantage of these instruments, is that they do not directly measure the height of newly fallen snow. So far, this problem has been replaced by measuring the difference in total snow height between two consecutive days, which is not very accurate and it is only an approximation. The work was done at Slovenian Environment Agency (ARSO) where we prepared a method that gives us a better estimate of new snow that takes into account meteorological parameters. The method is based on machine learning and was developed in the programming language Python using the sklearn library, where we used multiple polynomial regression. The result of the method has reduced the mean absolute error of the difference method by about 20%. The method works best for solid form of precipitation. The estimated height of new snow can be used for locations where we do not have the classic measurement of newly fallen snow or for data control where the height is measured.

Keywords:newly fallen snow, precipitation, snow depth sensor, correlation, error, measurement, method

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