public static Map<String, Metadata> readFile(String file) throws Exception {
NetcdfFile n = NetcdfFile.open(file);
System.out.println("Opened: " + file);
/* Determine the size of our grid */
int xLen = n.findDimension("x").getLength();
int yLen = n.findDimension("y").getLength();
System.out.println("Grid size: " + xLen + "x" + yLen);
/* What time is this set of readings for? */
Variable timeVar = n.findVariable("time");
String timeStr = timeVar.getUnitsString().toUpperCase();
timeStr = timeStr.replace("HOURS SINCE ", "");
timeStr = timeStr.replace("HOUR SINCE ", "");
/* Find the base date (the day) the reading was taken */
Date baseDate = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX").parse(timeStr);
/* Get the number of hours since the base date this reading was taken */
int offset = timeVar.read().getInt(0);
/* Generate the actual date for this reading */
Calendar calendar = Calendar.getInstance();
calendar.setTime(baseDate);
calendar.set(Calendar.HOUR, calendar.get(Calendar.HOUR) + offset);
System.out.println("Time of collection: " + calendar.getTime());
/* We'll keep a mapping of geolocations -> Galileo Metadata */
Map<String, Metadata> metaMap = new HashMap<>();
/* Determine the lat, lon coordinates for the grid points, and get each
* reading at each grid point. */
NetcdfDataset dataset = new NetcdfDataset(n);
@SuppressWarnings("resource")
GridDataset gridData = new GridDataset(dataset);
for (GridDatatype g : gridData.getGrids()) {
/* Let's look at 3D variables: these have WxH dimensions, plus a
* single plane. A 4D variable would contain elevation
* and multiple planes as a result */
if (g.getShape().length == 3) {
convert3DVariable(g, calendar.getTime(), metaMap);
}
}
return metaMap;
}
