legacy/src/main/java/ucar/nc2/thredds/MetadataExtractor.java
static public ThreddsMetadata.GeospatialCoverage extractGeospatial(InvDatasetImpl threddsDataset) throws IOException {
    ThreddsDataFactory.Result result = null;

    try {
      result = new ThreddsDataFactory().openFeatureDataset(threddsDataset, null);
      if (result.fatalError) {
        System.out.println(" openDatatype errs=" + result.errLog);
        return null;
      }

      if (result.featureType == FeatureType.GRID) {
        System.out.println(" GRID=" + result.location);
        GridDataset gridDataset = (GridDataset) result.featureDataset;
        return extractGeospatial( gridDataset);

      } else if (result.featureType == FeatureType.POINT) {
        PointObsDataset pobsDataset = (PointObsDataset) result.featureDataset;
        LatLonRect llbb = pobsDataset.getBoundingBox();
        if (null != llbb) {
          ThreddsMetadata.GeospatialCoverage gc = new ThreddsMetadata.GeospatialCoverage();
          gc.setBoundingBox(llbb);
          return gc;
        }
      } else if (result.featureType == FeatureType.STATION) {
        StationObsDataset sobsDataset = (StationObsDataset) result.featureDataset;
        LatLonRect llbb = sobsDataset.getBoundingBox();
        if (null != llbb) {
          ThreddsMetadata.GeospatialCoverage gc = new ThreddsMetadata.GeospatialCoverage();
          gc.setBoundingBox(llbb);
          return gc;
        }
      }

    } finally {
      try {
        if ((result != null) && (result.featureDataset != null))
          result.featureDataset.close();
      } catch (IOException ioe) {
        logger.error("Closing dataset "+result.featureDataset, ioe);
      }
    }

    return null;
  }
static public ThreddsMetadata.GeospatialCoverage extractGeospatial(InvDatasetImpl threddsDataset) throws IOException {
    ThreddsDataFactory.Result result = null;

    try {
      result = new ThreddsDataFactory().openFeatureDataset(threddsDataset, null);
      if (result.fatalError) {
        System.out.println(" openDatatype errs=" + result.errLog);
        return null;
      }

      if (result.featureType == FeatureType.GRID) {
        System.out.println(" GRID=" + result.location);
        GridDataset gridDataset = (GridDataset) result.featureDataset;
        return extractGeospatial( gridDataset);

      } else if (result.featureType == FeatureType.POINT) {
        PointObsDataset pobsDataset = (PointObsDataset) result.featureDataset;
        LatLonRect llbb = pobsDataset.getBoundingBox();
        if (null != llbb) {
          ThreddsMetadata.GeospatialCoverage gc = new ThreddsMetadata.GeospatialCoverage();
          gc.setBoundingBox(llbb);
          return gc;
        }
      } else if (result.featureType == FeatureType.STATION) {
        StationObsDataset sobsDataset = (StationObsDataset) result.featureDataset;
        LatLonRect llbb = sobsDataset.getBoundingBox();
        if (null != llbb) {
          ThreddsMetadata.GeospatialCoverage gc = new ThreddsMetadata.GeospatialCoverage();
          gc.setBoundingBox(llbb);
          return gc;
        }
      }

    } finally {
      try {
        if ((result != null) && (result.featureDataset != null))
          result.featureDataset.close();
      } catch (IOException ioe) {
        logger.error("Closing dataset "+result.featureDataset, ioe);
      }
    }

    return null;
  }
Extract the lat/lon/alt bounding boxes from the dataset.
@param threddsDataset open this dataset
@return ThreddsMetadata.GeospatialCoverage, or null if unable.
@throws IOException on read error