elevAnalysis

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Scanner;

public class elevAnalysis
{
    public static void main (String[] args) throws FileNotFoundException
    {
        //Read in the values from a raw data set. Elevations will be of type double.
        Scanner elevDataFile = new Scanner(new File("rawElevData.txt"));

        ArrayList<Double> elevData = new ArrayList<Double>();


        while(elevDataFile.hasNextLine()){
            String line = elevDataFile.nextLine();

            Scanner scanner = new Scanner(line);
            scanner.useDelimiter(",");
            while(scanner.hasNextDouble()){
                elevData.add(scanner.nextDouble());
            }
            scanner.close();
        }

        elevDataFile.close();

        System.out.println(elevData); //First print is untouched data.

        //Run through array list and look for inaccurate changes. Read in tolerance.
        if (elevData.isEmpty())
        	System.out.println("List is empty.");


        //Set up tolerance for comparing elevation values.
        Scanner keyboard = new Scanner(System.in);
        double tolerance = 50; //Tolerance can be changed.
        System.out.println("Tolerance is set at " + tolerance + ".\nPlease enter elevation tolerance.\n");
        tolerance = keyboard.nextInt();

        //Analyze elevation values looking for erratic/inaccurate changes.
        for (int i = 0; i < elevData.size(); ++i){
            double difference = Math.abs(elevData.get(i)-elevData.get(i+1));
        	    if(difference>tolerance){
                    System.out.println("Value found out of tolerance.");
              	    elevData.set(i, elevData.get(i+1));
        	    }
        }

        //Print out new data and print to file.
        System.out.println("New data is as follows:\n");
        System.out.println(elevData);
        //Save arraylist to the cleanData file.
        PrintWriter pw = new PrintWriter(new FileOutputStream("cleanData.txt"));
        pw.println(elevData);
        pw.close();

    }
}