title: Is it possible to partially calculate the graphs of Open Trip Planner?
body: <p>I have a question about Open Trip Planner. In the project I'm working on I've automated the download of GTFS files whenever an update is available.</p>
  
  <p>Every time my server downloads a new update, however, it is recreating the entire graph (including the map and the GTFS that have not been modified).</p>
  
  <p>Is it possible to update only the graphs related to specific GTFS in OTP?</p>
  
  <p>In the guide it says that it is possible to save graphs, but this part of the tutorial is very poor, or maybe I cannot find it.</p>
  
  <p>link to guide I am referring: <a href="http://docs.opentripplanner.org/en/latest/Basic-Tutorial/" rel="nofollow noreferrer">http://docs.opentripplanner.org/en/latest/Basic-Tutorial/</a></p>
  
  <p>I am using the following command to start OTP:</p>
  
  <pre><code>java -Xmx512m -jar "/otp-1.4.0-shaded.jar" --build "/downloads" --inMemory
  </code></pre>