RPC correction based on arcpy API

This article is to fill the pit , Previously written RPC The basic principle of , Write from bottom RPC Correction is still very difficult , At present, for the sake of rapid engineering , First I wrote an example based on arcpy in RPC Calibration script .
The core code is as follows ：

import os 
import arcpy

def OrthoCorrected(in_ras, out_ras_path):
    ''' Incorporates elevation data and image metadata to accurately line up imagery. :param in_ras: Select the raster dataset that you want to orthorectify. The raster must have rational polynomial coefficients (RPCs) in its metadata. :param out_ras_path: The output path :return: None '''
    script_path = os.path.split(os.path.realpath(__file__))[0]
    dem_path = os.path.join(script_path,"GMTED2km.tif")
    
    in_ras_path = os.path.split(in_ras)
    out_ras = os.path.join(out_ras_path, in_ras_path[1][:-5]+'_rpc.tif')

above ：RPC Basic principle