Greetings! I think I was able to find the file you are using: https://e4ftl01.cr.usgs.gov/MOLT/MOD16A2.006/2001.01.01/MOD16A2.A2001001.h18v05.006.2017068142633.hdf and here is the code I have to read in the grid: --- import java.io.IOException; import ucar.nc2.dt.GridDatatype; import ucar.nc2.dt.grid.GridDataset; public class modis { public static void main(String[] args) { String location = "C:/Users/lesserwhirls/Desktop/modis/MOD16A2.A2001001.h18v05.006.2017068142633.hdf"; try (GridDataset gds = GridDataset.open(location)) { GridDatatype grid = gds.findGridDatatype("MOD_Grid_MOD16A2/Data_Fields/LE_500m"); System.out.println(grid.getUnitsString()); } catch (IOException e) { e.printStackTrace(); } } } --- What version of netCDF-Java are you using? Cheers, Sean > Hi > I use it but it returns null to GridDatatype variable > Maybe my problem is in the first line. > GridDataset gds = > ucar.nc2.dt.grid.GridDataset.open("C:\\MOD16A2.A2001001.h18v05.006.2017068142633.hdf"); > GridDatatype grid = > gds.findGridDatatype("MOD_Grid_MOD16A2/Data_Fields/LE_500m"); > > Thanks a lot Ticket Details =================== Ticket ID: LEC-363579 Department: Support netCDF Java Priority: Urgent Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.