ncDataReader2 is a library of C functions to access data stored in netCDF files using different interpolation and extrapolation methods. The aim of this library is to provide access from simulation systems like Modelica to data sets like weather data or measured time rows. As such systems usually require strictly continuity of functions and their derivatives, smooth spline interpolation is included. ncDataReader2 is released under the terms of the LGPL v2. For more information and installation instructions please have look at the doc folder.