1 #include<stdio.h>
2 #include<math.h>
3 #include<stdlib.h>
4 
5     /* Simple Vegetation ratio */
s_r(double redchan,double nirchan)6 double s_r(double redchan, double nirchan)
7 {
8     double result;
9 
10     if ((redchan) == 0.0) {
11 	result = -1.0;
12     }
13     else {
14 	result = (nirchan / redchan);
15     }
16     return result;
17 }
18 
19 
20