I have NOAA AVHRR time series datasets from 1982 to 2002 and I want to perform time series analysis in IDRISI but I cannot import nor visualize the datasets. I understand I have convert these files in tsf format for the time series analysis but I can seem to go about it.
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Clark Labs Hi,
Assuming you have the data in rst format, the first step is to create a raster group file in order of the time series. You can create a raster group file using Idrisi Explorer. Once you have this group file created, you can then create the associated time series file (.tsf) that defines the temporal parameters in the first panel in ETM. There is an option to create a .tsf on the first panel. You will then be able to view and analyze the time series.
You may want to review the tutorials on ETM. The first tutorial has a section on creating time series that contains more detail.
Regards,
James Toledano
Clark Labs
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Alex Brown A few years ago I worked with AVHRR NDVI data as prepared by UMD GLCF (GIMMS) and found that the TIFF file format chosen for FTP distribution used an unusual compression method, and could not be imported directly into IDRISI. The solution was a batch-process conversion script using the libtiff / libgeotiff tools then available at remotesensing.org -- which are now part of the GDAL tools. It should be possible to get the import done in IDRISI with a properly configured GDAL installation. It may be easier, however, to use other dataset archive sources now available which provide more flexible forms of access -- esp. the LDEO IRI Data Library: http://iridl.ldeo.columbia.edu/SOURCES/.UMD/.GLCF/.GIMMS/.NDVIg/.global/.dataset_documentation.html
Good luck --
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