Category:Angle Conventions: Difference between revisions
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Maps expressing directions may use different conventions according to the field of study they are used in. | Maps expressing directions may use different conventions according to the field of study they are used in. | ||
The "GRASS" convention is 'theta CCW from the +x axis' (i.e. mathematical|Cartesian convention). | The "GRASS" convention is 'theta CCW from the +x axis' (i.e. mathematical|Cartesian convention), which means CCW from E and pointing TO the direction (aspect, flow), whereas when dealing with meteorological data, for example, wind is usually expressed CW from N and pointing FROM where wind blows. | ||
Some modules currently adopt different angle conventions, therefore it is always necessary to be aware of which convention the direction maps are expressed in. | |||
Revision as of 18:07, 19 July 2015
Maps expressing directions may use different conventions according to the field of study they are used in. The "GRASS" convention is 'theta CCW from the +x axis' (i.e. mathematical|Cartesian convention), which means CCW from E and pointing TO the direction (aspect, flow), whereas when dealing with meteorological data, for example, wind is usually expressed CW from N and pointing FROM where wind blows. Some modules currently adopt different angle conventions, therefore it is always necessary to be aware of which convention the direction maps are expressed in.