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HDFIMG: Import HDF raster format
HDFIMG: Import HDF raster format| Presentation and options | Dialog box of the application |
| Syntax |
The 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.
Due to the wide spread distribution network and geographic data, the HDF format has been extended and expanded its use to many data distribution portals. In Remote sensing, data from MODIS, ASTER and Chris sensor are distributed in HDF. However, this great distribution of data has not been accompanied by a widely adopted standard for the distribution of metadata. Despite this shortcoming, the HDFIMG tool documented properly the metadata using a scanning algorithm of available metadata.
Permission to import option generates two text files that include metadata for each band (Attributes_SD) and global ECS metadata (Metadata_ECS) of HDF file. The files are saved in a directory whose name follows the structure Metadata_ProductName.
The available options are:
If the import option is requested, two text files are generated that include the metadata of each band (Attributes_SD) and the global ECS metadata of the HDF file (Metadata_ECS). The files are saved in a directory whose name follows the structure Metadata_productname.
HDFIMG currently has implemented support for the following products:
ASTERIs 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.
Is the radiances registered in the sensor . In this case to obtain images of radiances must apply the adjustment factors in the field of radiometry of REL using the following formula:
L = (DN-1) x UCC
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 14.8.2007, the output folder will be: AST3A01_40718_20070814.
To download MODIS products can consult the web:
WIST -- https://wist.echo.nasa.gov
USGS Global Visualization Viewer -- http://glovis.usgs.gov
MODIS Rapid Response System -- http://rapidfire.sci.gsfc.nasa.gov
Structure of the information generated:
IMG is generated multiband raster in a directory whose name follows the structure MO###_ grid_yearmonthday, where ### is the type of format. For example, to the image with grid MOD021KM h00v45 and date 01/01/2010, the output folder will be: MOD021KM_0045_20100101.
Georeferencing:
To georeference the products (MOD02HKM/MYD02HKM) and (MOD021KM/MYD021KM) is also necessary to import the geolocation product (MOD03/MYD03). For L2 products will use the latitude and longitude grid. The remaining products are supplied MODIS and georeferenced 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.
Application can be used to convert MiraMon CanviPrj georeferencing that 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 product of the sensors SeaWiFS, MODIS, OCTS and CZCS and in cylindrical projection.
To download L3SMI products please consult the website: http://oceancolor.gsfc.nasa.gov
Structure of the information generated:
IMG raster is generated in a directory whose name follows theI###.L3m_ttt_pppp_r, where I is the first character is the instrument identifier (S for SeaWiFS, A for MODIS Aqua, MODIS Terra T, 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 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: http://www.science.oregonstate.edu/ocean.productivity
Structure of the information generated:
IMG raster is generated in a directory whose name follows the structure nombreproducto_fecha 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 12/01/1997 is: NPP_19971201.
CHRIS (Compact High Resolution Imaging Spectrometer) is a sensor onboard ESA's Proba satellite, which provides data in HDF format.
There are five modes of distribution of images from CHRIS classified as modes 1 to 5, the modes implemented are:
References:
Cutter, M.A. (2008) CHRIS Data Format, Surrey Satellite TechnologyLimited.
Structure of the information generated:
IMG raster is generated in a directory whose name follows the structure CHRIS_fecha_hora, where the date is formatted YearMonthDay. For example for the CHRIS image of Time 02/19/2009 15:51:34 output folder is: CHRIS_20090219_155134.
MISR (Multi-angle Imaging Spectroradiometer) 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 ° and 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.
To download product MISR Level 3 Imagery (L3SMI) can check the website:
MISR -- http://www-misr.jpl.nasa.gov
MISR Level 3 Imageryr -- http://eosweb.larc.nasa.gov/PRODOCS/misr/level3/download_data.html
If you need to import a new product not supported by HDFIMG HDF, please please contact us at suport@miramon.uab.cat.
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