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HDFIMG: Import HDF raster format
HDFIMG: Import HDF raster formatThe HDF format (Hierarchical Data Format) is a format for
storing and structuring large amounts of numerical data. Originally
developed by the National Center for Supercomputing and Applications.
Currently called HDF Group is responsible for updating and revising the
format. This format allows to store different data models, such as
multidimensional arrays, raster images and tables. HDFIMG program receives a
file in HDF format and generates a multiband IMG file in a folder or output
generates a dump of the metadata contained in the HDF file. In case of
import mode is selected, the application preselected product type according
to heuristic exploration of the product name in the metadata.
HDFIMG has currently implemented support for the following products:
Is the radiances registered in the sensor with the additional application of the geometric correction of the image. This product also contains a digital elevation model generated from the sensor data.
References:
* Abrams, M., Hook, S. and Ramachandran, B. (1999) Aster User
Handbook, Version 2, NASA/Jet Propulsion Laboratory, Pasadena.
* Earth Remote Sensing Data Analysis Center (ERSDAC) (2002) ASTER
LEVEL 3A01 DATA PRODUCTS SPECIFICATION (GDS Version) Version 1.1.
References:
* Abrams, M., Hook, S. and Ramachandran, B. (1999) Aster User
Handbook, Version 2, NASA/Jet Propulsion Laboratory, Pasadena.
* Earth Remote Sensing Data Analysis Center (ERSDAC) (2001) ASTER
LEVEL 1 DATA PRODUCTS SPECIFICATION Version. 2.4.
Structure of the information generated:
IMG is generated multiband raster in a directory whose name follows
the structure AST###_orbit_yearmonthday, where ### is the type of format. For example, for image A1 ASTER orbit number 40718 and
dated 08-14-2007, the output folder will be:
AST3A01_40718_20070814.
Georeferencing:
To georeference the products (MOD02HKM/MYD02HKM) and (MOD021KM/MYD021KM) is also necessary to import the geolocation product (MOD03/MYD03). For L2 products the latitude and longitude grid will be used. The remaining MODIS products are supplied georeferenced in V5 MODIS sinusoidal system. The files should have the same pattern of name: MOD021KM.A2009152.1130.005.2009152235056.hdf and MOD03.A2009152.1130.005.2009152231421.hdf.
MiraMon CanviPrj application can be used to convert this georeferencing to other interest.
The product L3 Standard Mapped Image (SMI) is composed of global
oceanographic data and is available in HDF format. This
oceanographic parameters (Chlorophyll a concentration, Angstrom
coefficient, Normalized water-leaving radiance at each visible
wavelength, Aerosol optical thickness, Epsilon and Diffuse
attenuation coefficient at 490 nm) for different periods of time.
The products are generated from the binary products of the sensors
SeaWiFS, MODIS, OCTS or CZCS and in cylindrical projection.
To download L3SMI products please consult the website:
http://oceancolor.gsfc.nasa.gov
Structure of the information generated:
An IMG raster is generated in a directory whose name follows the
structure I###.L3m_ttt_pppp_r, where I is the first character of
the instrument identifier (S for SeaWiFS, A for MODIS on Aqua, T for MODIS on Terra, O for OCTS, C for CZCS). The file name extensions are of
the form L3m_ttt_pppp_r, where ttt is the initial duration, pppp is
a code for the geophysical parameters of the product, and r is the
resolution in km. For example, the image of chlorophyll a of 2km, the
output folder will be: S2004008.L3m_DAY_P118_chlor_a_ARG_2km.
This is a product of estimates of ocean productivity for different data sets and with different processing algorithms, such as the Standard-VGPM and Eppley-VGPM.
To download L3SMIse products please consult the web:Structure of the information generated:
An IMG raster is generated in a directory whose name follows the structure producname_date, where productname is the corresponding name for each product and the date is formatted yearmonthday. For example the image of net primary production output folder of 12-01-1997 is: NPP_19971201.
There are five distribution modes for CHRIS images, classified as modes 1 to 5, the modes implemented are:
MODE 1: TOTAL: Full swath width, 62 spectral bands, 773nm / 1036nm, nadir ground sampling distance 34m @ 556km.
MODE 2: WATER BANDS: Full swath width, 18 spectral bands, nadir ground sampling distance 17m @ 556km.
MODE 3: LAND CHANNELS: Full swath width, 18 spectral bands, nadir ground sampling distance 17m @ 556km.
MODE 4: CHLOROPHYL BAND SET: Full swath width, 18 spectral bands, nadir ground sampling distance 17m @ 556km.
References:
Cutter, M. A, 2008, CHRIS Data Format, Surrey Satellite Technology Limited.
Structure of the information generated:
An IMG raster is generated in a directory whose name follows the structure CHRIS_date_time, where the date is formatted yearmonthday. For example for the CHRIS image of 02-19-2009 and time 15:51:34 the output folder is: CHRIS_20090219_155134.
MISR (Multiangle Imaging Spectro-Radiometer) have 9 cameras, pointing in different directions. Thus providing a multi-angle coverage around the globe. They have the ability to observe 9 different angles simultaneously (in addition to nadir, ±26.1°, ±45.6°, ±60.0° i ±70.5°) both forward and backward orbit and 4 spectral bands (B, G, R, NIR) . In general, large angles provide greater sensitivity to the effects of atmospheric aerosols and cloud effects, while the angles closest to nadir provide information of the Earth's surface.
MISR Level 3 Imagery (L3SMI) products can be downloaded at the
website:
MISR -- http://www-misr.jpl.nasa.gov
MISR Level 3 Imageryr -- http://eosweb.larc.nasa.gov/PRODOCS/misr/level3/download_data.html
To import a new HDF product not supported by HDFIMG, please
contact us at suport@miramon.uab.cat.