Gravityfield2AreaMeanTimeSeries
This program computes a time series of time variable gravityfield functionals averaged over a given area, e.g. equivalent water heights in the amazon basin. The type of functional (e.g gravity anomalies or geoid heights) can be choosen with kernel. The average is performed at each time step by a weigthed average over all grid points where the weight is the associated area at each point. If removeMean is set the temporal mean is removed from the time series. To speed up the computation the gravity field can be converted to spherical harmonics before the computation with convertToHarmonics.
Additionally the root mean square of the values in the area at each time step can is computed if compueRms is set.
Additionally the accuracy of the value at each time step can be computed if compueSigma is set.
The outputfileTimeSeries is an instrument file with one, two, or three data columns. First data column contains the computed functionals and the following columns contain the RMS and the accuracies (optionally).
To visualize the results use PlotGraph.
| Name | Type | Annotation |
|---|---|---|
outputfileTimeSeries | filename | |
grid | grid | |
timeSeries | timeSeries | |
kernel | kernel | |
gravityfield | gravityfield | |
convertToHarmonics | boolean | gravityfield is converted to spherical harmonics before evaluation, may accelerate the computation |
multiplyWithArea | boolean | multiply time series with total area (useful for mass estimates) |
removeMean | boolean | remove the temporal mean of the series |
computeRms | boolean | additional rms each time step |
computeSigma | boolean | additional error bars at each time step |