Added scripts

Author: Eric Lujan

script/noaafilter.rb

@@ -0,0 +1,57 @@
+require 'csv'
+
+print "Enter the filename of the NOAA data to parse: "
+# Open the specified file into memory in a read-only mode
+filename = gets.chomp
+datafile = File.open(filename) or die "Could not open the file."
+# Create an empty array to store the lines in the file
+contents = []
+# Read each line into the contents array for processing
+datafile.each_line do |line|
+  contents.push line
+end
+# Prompt the user for a new filename
+print "Enter the filename for the processed data (.csv will be appended): " 
+newfilename = gets.chomp + ".csv"
+# Create the new file and open it for writing
+newfile = File.open(newfilename, "w")
+# Add the standard CSV headers to the file
+newfile.puts "date,status,pressure,height,temperature,dewpointdepression,winddirection,windspeed"
+# Prompt for the target altitude
+print "Enter the target altitude (m): "
+target = gets.to_i
+print "Enter the tolerance (m): "
+tolerance = gets.to_i
+@lower_bound = target - tolerance
+@upper_bound = target + tolerance
+# Let the user know this may take a while
+puts "Processing, reformatting, and filtering data file. This may take a while. \nWe'll let you know when we're done."
+# Iterate through each line and remove any that have invalid data
+contents.each do |line|
+  # Handle a regular line of data
+  if line[0] == "#"
+    @year = line[6..9]
+    @month = line[10..11]
+    @day = line[12..13]
+  end
+  unless line.include? "-9999" or line[0] == "#"
+    line =  @month + '/' + @day + '/' + @year + ',' + line
+    line = line.gsub(/ +/, ',')
+    line = line.gsub(/B/, '')
+    # Parse the newly created CSV data to extract its altitude
+    csvdata = CSV.parse(line)
+    csvdata.each do |row|
+      @altitude = row[3].to_i
+    end
+    # Test to see if the altitude falls between the specified range. If so, put it in the file.
+    if (@lower_bound..@upper_bound) === @altitude
+      newfile.puts line
+    end
+  end
+  # Handle an initialization header
+end
+# Clear up system resources, since we're just nice like that
+newfile.close
+datafile.close
+# Celebrate, perhaps by opening some champagne?
+puts "New file saved!"