ImgImporter

ImgImporter: Ast07 data import (ASTER based product)

ImgImporter is now open-source (read more).

Ast07 data is one of the products developed on the basis of ASTER spectroradiometer source data (more information about ASTER products data can be found here).

The data are atmospherically corrected ASTER data of L1B processing level (radiance at-sensor). These products correct the measured at-sensor radiance for the effects of atmospheric transmission due to gaseous absorption and path radiance due to molecular scattering using atmospheric profile information from NOAA (NCEP) derived assimilation models. The results of the atmospheric correction are only as good as he atmospheric profiles which are used. (Later versions of this product will use atmospheric temperature and water vapor profile information derived from MODIS and aerosol scattering information from MISR, sister instruments to ASTER on the TERRA platform when these atmospheric profile products are validated.)

The program is designed for processing ASTER HDF file to TIFF format conversion. The program operates in the batch or single file mode: you need to define folder containing hdf files (File->Set source folder) and the output directory for the resulting TIFF format files (File->Set target folder).

Source file extension should be *.hdf0 Thus, in this version of ImgImporter only VNIR bands are imported (visible and near infrared bands, 15м resolution).

The program generates 3 output file types:

• plain tiff;
• tiff with an accompanying twf file (ArcView world file also supported by other software, ArcGIS, ERDAS, etc);
• GeoTiff (special TIFF standard addition designed for georeference information integration into the file itself; has no external reference file).

ImgImporter georeferenced GeoTIFF can be easily opened with ERDAS IMAGINE, ArcGIS and Arcview GIS software. No additional steps for setting georeferencing is required (see examples).

The main object of creating the program was to solve the task of processing a considerable amount of HDF files at once. When you press Start Conversion button the program sequentially processes all files found in the *source folder* directory. At that, the output picture will constitue of three 256-bit channels of the initial one ("band1","band2","band3"), broken down into the three RGB components. The picture itself will be rotated by MAPORIENTATIONANGLE angle, obtained from metadata. The data for geographical reference is obtained from the core metadata also.

Current version - 0.1.6c

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Последнее обновление: August 04 2007