import numpy as np
import matplotlib.pyplot as plt

dataset = np.genfromtxt('my_db.csv', delimiter=',',usecols=(1,2,3),names=['z','y','x'])

plt.xlabel('Latitude')
plt.ylabel('Longitude')

#x = data['x']
#y = data['y']
#z = data['z']
dataset[dataset[:,1].argsort()]

# 0 dBm is never extracted from the database
old = [0,0,0]
result = []

for x in dataset:
    if x[0] == old[0] and x[1] == old[1]:
        
plt.colorbar()
plt.show()