Displaying wind data In this post we discuss th e following topics: Displaying vectors using its X/Y components 1. Computing magnitude and directi on using GRASS 2. Using advanced symbology in QGIS Introduction: Meteorological conditions of any location at a given time are a function of many variables such as atmospheric temperature, relative humidity, pressure and mainly the wind parameter. Thi s wind para meter and its patte rn deter mine most of the signi fica nt weather phenomena that occur around the world everyday from small wind gusts to the setting of monsoon. Wind satisfies the conditions of vector quantity as it has both magnitude and direction, which varies according to the location, season and also the altitude. Wind being one of the mai n components of wea ther is diffi cult to acquir e for a particular region let alone the whole world. Wind data is mostly available in a gridded format with values of X, Y accompanied by wind vector data. These data are generally ve ry difficult to process wi thout the help of some softwa re, which is generally th e case for most meteorological departments all ov er the world. Meteorologi cal depa rtments generally prefer softwares for time series analysis (to compare historical data) such as GrADS. Hence GIS softwares are not widely used or preferred by Met departments for process ing th e wind data. GIS toos prov ide a lot more features and tools to process and analyse wind data. T hese datase ts are useful in site suita bility studies, fire ma nagement and many other fields where the p rev aling weather is an important f actor in modeling. Wind Direction and Magnitude For most of the meteorologi cal pur poses, wi nd data is measured in terms of its orthogonal components i.e U (East-West) and V (North-South) components of the Wind. These can be used to calculate the wi nd directi on and magnit ude by usi ng si mple 3. DevelopmentConsultingTrainingP ortfolioA boutContact Us Display ing wind data | kCu be http://www.kcubeconsulting.com /blog/displaying-wind-dat a 1 de 14 28-!-21! 12:1
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Meteorological conditions of any location at a given time are a function of many variablessuch as atmospheric temperature, relative humidity, pressure and mainly the windparameter.
This wind parameter and its pattern determine most of the significant weather
phenomena that occur around the world everyday from small wind gusts to the setting of
monsoon. Wind satisfies the conditions of vector quantity as it has both magnitude and
direction, which varies according to the location, season and also the altitude.
Wind being one of the main components of weather is difficult to acquire for a
particular region let alone the whole world. Wind data is mostly available in a gridded
format with values of X, Y accompanied by wind vector data. These data are generally
very difficult to process without the help of some software, which is generally the case for
most meteorological departments all over the world. Meteorological departments
generally prefer softwares for time series analysis (to compare historical data) such as
GrADS. Hence GIS softwares are not widely used or preferred by Met departments for
processing the wind data.
GIS toos provide a lot more features and tools to process and analyse wind data.
These datasets are useful in site suitability studies, fire management and many other
fields where the prevaling weather is an important factor in modeling.
Wind Direction and Magnitude
For most of the meteorological purposes, wind data is measured in terms of its
orthogonal components i.e U (East-West) and V (North-South) components of the Wind.
These can be used to calculate the wind direction and magnitude by using simple
3.
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