Detailed Description

Inverse Distance Weighting interpolation algorithm with elevation detrending/reprojection.

The closest n stations to each pixel are used to compute the local lapse rate, allowing to project the contributions of these n stations to the local pixel with an inverse distance weight. It therefore takes the following arguments:

NEIGHBORS: how many neighbouring stations should be used;
MAX_DISTANCE: maximum allowed distance (in meters) between the stations and grid points to interpolate to;
SCALE: this is a scaling parameter to smooth the IDW distribution. In effect, this is added to the distance in order to move into the tail of the 1/d distribution (default: 1000m);
ALPHA: this is an exponent to the 1/d distribution (default: 1);

Either NEIGHBORS or MAX_DISTANCE needs to be specified. When both are specified, both restrictions are used. In such cases, only stations less than MAX_DISTANCE away from the grid point to interpolate to are used, up to a maximum of n stations. This can lead to less than n stations to be included in the interpolation.

Note: Beware, this method sometimes produces very sharp transitions as it spatially moves from one station's area of influence to another one!

TA::algorithms = LIDW_LAPSE

TA::lidw_lapse::neighbors = 6

#include <IDWLapseLocalAlgorithm.h>

Public Member Functions
	LocalIDWLapseAlgorithm (const std::vector< std::pair< std::string, std::string > > &vecArgs, const std::string &i_algo, const std::string &i_param, TimeSeriesManager &i_tsm)

virtual double	getQualityRating (const Date &i_date) override

virtual void	calculate (const DEMObject &dem, Grid2DObject &grid) override

Public Member Functions inherited from mio::InterpolationAlgorithm
	InterpolationAlgorithm (const std::vector< std::pair< std::string, std::string > > &, const std::string &i_algo, const std::string &i_param, TimeSeriesManager &i_tsm)

virtual	~InterpolationAlgorithm ()

std::string	getInfo () const
	Return an information string about the interpolation process.

Additional Inherited Members
Public Attributes inherited from mio::InterpolationAlgorithm
const std::string	algo

Protected Member Functions inherited from mio::InterpolationAlgorithm
std::vector< double >	getData (const Date &i_date, const std::string &i_param)

size_t	getData (const Date &i_date, const std::string &i_param, std::vector< double > &o_vecData, std::vector< StationData > &o_vecMeta)

Protected Attributes inherited from mio::InterpolationAlgorithm
TimeSeriesManager &	tsmanager

Date	date

std::vector< MeteoData >	vecMeteo

std::vector< double >	vecData
	store the measurement for the given parameter

std::vector< StationData >	vecMeta
	store the station data for the given parameter

std::ostringstream	info
	to store some extra information about the interplation process

const std::string	param
	the parameter that we will interpolate

size_t	nrOfMeasurments
	Number of stations that have been used, so this can be reported to the user.

Constructor & Destructor Documentation

◆ LocalIDWLapseAlgorithm()

mio::LocalIDWLapseAlgorithm::LocalIDWLapseAlgorithm	(	const std::vector< std::pair< std::string, std::string > > &	vecArgs,
		const std::string &	i_algo,
		const std::string &	i_param,
		TimeSeriesManager &	i_tsm
	)

Member Function Documentation

◆ calculate()

void mio::LocalIDWLapseAlgorithm::calculate	(	const DEMObject &	dem,
		Grid2DObject &	grid
	)

overridevirtual

Implements mio::InterpolationAlgorithm.

◆ getQualityRating()

double mio::LocalIDWLapseAlgorithm::getQualityRating ( const Date & i_date )