Geografic-Information-System/raster/r.spread/pick_ignite.c

/******************************************************************************
 *
 *	pick_ignite.c 	pick an ignition based on probability
 *	
 * Usage: pick_ignite (fuelmoisture)
 *
 * Notes: pick_ignite() pick an ignition idetermined by fine fuel moisture
 * based on the probability simplified from Rothermel (1983): Predicting
 * ?????????????????? 
 * Author: Jianping Xu, Rutgers University
 * Date: 06/11/1994
 ******************************************************************************/
#include <stdlib.h>
#include <limits.h>
#include "local_proto.h"

int p[18] = { 100, 100, 100, 90, 80, 70, 60, 50, 40,	/*adapt the "average" */
    40, 30, 30, 20, 20, 20, 10, 10, 10
};				/*10-50 shading, 80-89F */

int pick_ignite(int i)
{
    return ((100.0 * rand() / INT_MAX) <= p[i]);
}