[ncl-talk] hdf confusion

[Marston Johnston]

Hi,

 

Try this function: http://www.ncl.ucar.edu/Document/Functions/Contributed/short2flt_hdf.shtml

 

/M

 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Johnston, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 

 

From: <ncl-talk-bounces at ucar.edu> on behalf of Michael Notaro <mnotaro at wisc.edu>
Date: Tuesday, 13 June 2017 at 22:33
To: "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
Subject: [ncl-talk] hdf confusion

 

Sorry for the ignorant question but I am having trouble figuring out

how to properly retrieve the land-lake-ocean mask off this MODIS hdf file.

If I ncl_filedump *hdf, it shows the variable as ushort.  If I ncl_filedump *hdf.hdfeos,

it shows the variable as short.  Which should I use in addfile and how do I 

retrieve the values of 001=land, 000=ocean, etc?

Michael

 

 

ncl_filedump h10v04_yellowstone/MOD13Q1.A2012001.h10v04.006.2015236172021.hdf.hdfeos

 

    short 250m_16_days_VI_Quality_MODIS_Grid_16DAY_250m_500m_VI ( YDim_MODIS_Grid_16DAY_250m_500m_VI, XDim_MODIS_Grid_16DAY_250m_500m_VI )

         coordinates :

GridLat_MODIS_Grid_16DAY_250m_500m_VI, GridLon_MODIS_Grid_16DAY_250m_500m_VI

         hdfeos_name :

250m 16 days VI Quality

         projection :

Sinusoidal

         unsigned :

True

         Legend :

 

Bit Fields Description (Right to Left): 

[0-1] : MODLAND_QA [2 bit range] 

00: VI produced, good quality 

01: VI produced, but check other QA 

10: Pixel produced, but most probably cloudy 

11: Pixel not produced due to other reasons than clouds 

[2-5] : VI usefulness [4 bit range] 

0000: Highest quality 

0001: Lower quality  

0010..1010: Decreasing quality 

1100: Lowest quality 

1101: Quality so low that it is not useful 

1110: L1B data faulty 

1111: Not useful for any other reason/not processed 

[6-7] : Aerosol quantity [2 bit range] 

00: Climatology 

01: Low 

10: Average 

11: High (11) 

[8] : Adjacent cloud detected; [1 bit range] 

1: Yes 

0: No 

[9] : Atmosphere BRDF correction performed [1 bit range] 

1: Yes 

0: No 

[10] : Mixed clouds  [1 bit range] 

1: Yes 

0: No 

[11-13] : Land/Water Flag [3 bit range] 

000: Shallow ocean 

001: Land (Nothing else but land) 

010: Ocean coastlines and lake shorelines 

011: Shallow inland water 

100: Ephemeral water 

101: Deep inland water 

110: Moderate or continental ocean 

111: Deep ocean 

[14] : Possible snow/ice [1 bit range] 

1: Yes 

0: No 

[15] : Possible shadow [1 bit range] 

1: Yes 

0: No

         _FillValue :

-1

         valid_range :

( 0, -2 )

         units :

bit field

         long_name :

250m 16 days VI Quality

 

ncl_filedump h10v04_yellowstone/MOD13Q1.A2012001.h10v04.006.2015236172021.hdf




      ushort 250m_16_days_VI_Quality ( YDim_MODIS_Grid_16DAY_250m_500m_VI, XDim_MODIS_Grid_16DAY_250m_500m_VI )

         long_name :

250m 16 days VI Quality

         units :

bit field

         valid_range :

( 0, 65534 )

         _FillValue :

65535

         Legend :

 

Bit Fields Description (Right to Left): 

[0-1] : MODLAND_QA [2 bit range] 

00: VI produced, good quality 

01: VI produced, but check other QA 

10: Pixel produced, but most probably cloudy 

11: Pixel not produced due to other reasons than clouds 

[2-5] : VI usefulness [4 bit range] 

0000: Highest quality 

0001: Lower quality  

0010..1010: Decreasing quality 

1100: Lowest quality 

1101: Quality so low that it is not useful 

1110: L1B data faulty 

1111: Not useful for any other reason/not processed 

[6-7] : Aerosol quantity [2 bit range] 

00: Climatology 

01: Low 

10: Average 

11: High (11) 

[8] : Adjacent cloud detected; [1 bit range] 

1: Yes 

0: No 

[9] : Atmosphere BRDF correction performed [1 bit range] 

1: Yes 

0: No 

[10] : Mixed clouds  [1 bit range] 

1: Yes 

0: No 

[11-13] : Land/Water Flag [3 bit range] 

000: Shallow ocean 

001: Land (Nothing else but land) 

010: Ocean coastlines and lake shorelines 

011: Shallow inland water 

100: Ephemeral water 

101: Deep inland water 

110: Moderate or continental ocean 

111: Deep ocean 

[14] : Possible snow/ice [1 bit range] 

1: Yes 

0: No 

[15] : Possible shadow [1 bit range] 

1: Yes 

0: No

         hdf_name :

250m 16 days VI Quality

 

 

Michael Notaro

Associate Director

Nelson Institute Center for Climatic Research

University of Wisconsin-Madison

Phone: (608) 261-1503

Email: mnotaro at wisc.edu

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