Simple way to find the 1D index location of a single value in a numpy array. I often use this to find the location of a lat/lon pair in numpy arrays.

find_nearest.py

#!/usr/local/bin/python

import numpy as np
##################################################################################
##  Find Indicies
##  Given an input lat or lon, the function returns the nearest index location
##################################################################################
def find_nearest(array,value):
    """ Find the index location in (array) with value nearest to (value)"""
    idx = (np.abs(array-value)).argmin()
    return idx