interp#

Sounding and Hodograph Analysis and Research Program Library (SHARPlib) :: Interpolation Routines

nwsspc.sharp.calc.interp.interp_height(hght_val: float, hght_arr: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False], data_arr: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False]) → float#

Interpolate a value from an array in height coordinates (meters). The coordinate array (hght_arr) is assumed to be sorted (ascending).

Parameters:

  • hght_val (float) – The coordinate height value to interpolate to (meters)

  • hght_arr (numpy.ndarray[dtype=float32]) – 1D numpy array of height values to interpolate from (meters)

  • data_arr (numpy.ndarray[dtype=float32]) – float 1D numpy array of data values to interpolate from

Returns:

An interpolated data value from data_arr corresponding to hght_val

Return type:

float

nwsspc.sharp.calc.interp.interp_pressure(pres_val: float, pres_arr: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False], data_arr: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False]) → float#

Interpolate a value from an array in pressure coordinates (Pa). All pressure interpolation happens in log10 space. The coordinate array (pres_arr) is assumed to be sorted (descending).

Parameters:

  • pres_val (float) – The coordinate pressure value to interpolate to (Pa)

  • pres_arr (nump.ndarray[dtype=float32]) – 1D numpy array of pressure values to interpolate from (Pa)

  • data_arr (numpy.ndarray[dtype=float32]) – 1D numpy array of data values to interpolate from

Returns:

An interpolated data value from data_arr corresponding to pres_val

Return type:

float

nwsspc.sharp.calc.interp.find_first_height(data_val: float, height: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False], data_array: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False]) → float#

Conducts a bottom-up search for the first occurrence of a given value, and interpolates in order to get the height level it occurs at.

Parameters:

  • data_val (float) – The value to search for

  • height (numpy.ndarray[dtype=float32]) – 1D NumPy array of height values (meters)

  • data_array (numpy.ndarray[dtype=float32]) – 1D NumPy array of values to search over

Returns:

The height level of first occurrence (meters)

Return type:

float

nwsspc.sharp.calc.interp.find_first_pressure(data_val: float, pressure: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False], data_array: ndarray[dtype=float32, shape=(*), order='C', device='cpu', writable=False]) → float#

Conducts a bottom-up search for the first occurrence of a given value, and interpolates in order to get the pressure level it occurs at.

Parameters:

  • data_val (float) – The value to search for

  • pressure (numpy.ndarray[dtype=float32]) – 1D NumPy array of pressure values (Pa)

  • data_array (numpy.ndarray[dtype=float32]) – 1D NumPy array of values to search over

Returns:

The pressure level of first occurrence (Pa)

Return type:

float