66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
#include <print>
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#include <stdexcept>
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#include <netcdf>
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#include "readdata.h"
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using namespace std;
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using namespace netCDF;
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template <typename T>
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vector<T> getVarVector(const NcVar &var) {
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int length = 1;
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for (NcDim dim : var.getDims()) {
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length *= dim.getSize();
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}
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vector<T> vec(length);
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var.getVar(vec.data());
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return vec;
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}
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/**
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* Read a 3D matrix from a NetCDF variable.
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* Reads data into a contiguous 1D data vector.
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* Returns a pair of the size of the matrix (in the form of an extent) with the data vector.
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*
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* Inteded usage of this function involves using the two returned values
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* to create an mdspan:
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*
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* auto arr = mdspan(vec.data(), size);
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*/
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template <typename T>
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pair<vector<T>, std::dextents<std::size_t, 3>> get3DMat(const NcVar &var) {
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if(var.getDimCount() != 3) {
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throw invalid_argument("Variable is not 3D");
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}
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int timeLength = var.getDim(0).getSize();
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int latLength = var.getDim(1).getSize();
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int longLength = var.getDim(2).getSize();
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vector<T> vec(timeLength*latLength*longLength);
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var.getVar(vec.data());
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auto arr = std::mdspan(vec.data(), timeLength, latLength, longLength);
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return {vec, arr.extents()};
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}
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pair<vector<double>, std::dextents<std::size_t, 3>> readHydrodynamicU() {
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netCDF::NcFile data("../../../../data/hydrodynamic_U.h5", netCDF::NcFile::read);
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multimap< string, NcVar > vars = data.getVars();
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return get3DMat<double>(vars.find("uo")->second);
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}
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tuple<vector<double>, vector<double>, vector<double>> readGrid() {
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netCDF::NcFile data("../../../../data/grid.h5", netCDF::NcFile::read);
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multimap< string, NcVar > vars = data.getVars();
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vector<double> time = getVarVector<double>(vars.find("times")->second);
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vector<double> longitude = getVarVector<double>(vars.find("longitude")->second);
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vector<double> latitude = getVarVector<double>(vars.find("latitude")->second);
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return {time, latitude, longitude};
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} |