npm install
npm start
To import a survey, append the url with ?survey=<surveyPath>, where <surveyPath> is the URL to the survey. At this path, it anticipates a file structure resembling this sample survey, with a points.json, spans.json, and images folder.
see usage.md for UI documentation.
The digitizer saves the current state of digitization at 5-second intervals to the browser's localStorage. Under the hood, it clones the current state and stores it under a key defined by the surveyPath above. If the digitizer initiates with a surveyPath matching one in the cache, it will prompt the user with an option to resume the previous session, before importing the survey anew.
localStorage is somewhat unpredictable and browsers purge it regularly, so this is meant to be a backup rather than a reliable storage method.