/**
* Determines the storage directory for a file, using its spatial properties run through the
* Geohash algorithm.
*
* <p>The resulting format is xx/xxx, which is specific to the NOAA NAM dataset, because this will
* place each unique grid point in its own directory.
*/
private static String getStorageDir(String outputDir, Metadata meta) {
Coordinates coords = meta.getSpatialProperties().getCoordinates();
String location = GeoHash.encode(coords.getLatitude(), coords.getLongitude(), 10);
String subDir = location.substring(0, 2) + "/" + location.substring(2, 5);
return outputDir + "/" + subDir;
}
/** Converts a 3D variable to a {@link Metadata} representation */
private static void convert3DVariable(GridDatatype g, Date date, Map<String, Metadata> metaMap)
throws IOException {
Variable v = g.getVariable();
System.out.println("Reading: " + v.getFullName());
Array values = v.read();
int h = v.getShape(1);
int w = v.getShape(2);
for (int i = 0; i < h; ++i) {
for (int j = 0; j < w; ++j) {
LatLonPoint pt = g.getCoordinateSystem().getLatLon(j, i);
String hash =
GeoHash.encode((float) pt.getLatitude(), (float) pt.getLongitude(), 10).toLowerCase();
Metadata meta = metaMap.get(hash);
if (meta == null) {
/* We need to create Metadata for this location */
meta = new Metadata();
UUID metaUUID = UUID.nameUUIDFromBytes(hash.getBytes());
meta.setName(metaUUID.toString());
SpatialProperties location =
new SpatialProperties((float) pt.getLatitude(), (float) pt.getLongitude());
meta.setSpatialProperties(location);
TemporalProperties time = new TemporalProperties(date.getTime());
meta.setTemporalProperties(time);
metaMap.put(hash, meta);
}
String featureName = v.getFullName().toLowerCase();
float featureValue = values.getFloat(i * w + j);
Feature feature = new Feature(featureName, featureValue);
meta.putAttribute(feature);
}
}
}
