EDIT: Solved, see my answer.

I've downloaded 8 MOD44B granules from Reverb (using the FTP script method), and am trying to use MRT to mosaic them. I'm falling at the first hurdle though - when I add the 4 files (4 from 2000, 4 from 2007) I get an error saying firstly One of the input files does not exist or the inputs are not the same data product type then Input file does not exist!. If I add files individually, I get an error saying Error in Module: ReadHrFile, Opening Input Header File.

Has any one had this error before, or know how to fix it? I've updated Java and reinstalled MRT.


  • MRT: 4.1 (March 2011)
  • Windows: 7
  • Java: 6 (Updated to 7, still doesn't work)

I would use the online interface, but I need MOD44b which isn't available with that for some reason.

  • 1
    For future reference, there is a web-based version of the tool called MRTWeb that lets will let you download mosaicked MODIS data without having to download get the source HDF files. This is useful if you're doing a time series analysis.
    – dmahr
    Jul 16, 2012 at 12:02
  • Thanks for the suggestion dmahr, although I did try this - see the bottom of my question. MOD44B is unavailable using MRTWeb for some reason (as far as I could tell).
    – gisol
    Jul 16, 2012 at 14:16

3 Answers 3


You need to open ModisTool.BAT rather than the ModisTool.JAR executable. Silly me. Least I have nice new versions of everything running now.


You can open the ModisTool.bat on Notepad and edit.

In last line it has the Java localization with "java.exe" two times. You need erase the last time and save it.


You need to run the .bat file by right clicking -> run as administrator. To prevent this error, install MRT by running command prompt as an administrator.

The error won't occur if MRT is installed in drive other than c:

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