Spectra handling

The following table lists functions that provide a variety of spectra handling capabilities.

I2SP outputs the band vectors at selected image locations as image spectra. The image spectra may be written to any of the GDB-supported file formats for spectra output (see Basic features of the Hyperspectral Analysis package). Alternatively, I2SP can output the mean image spectrum over multiple image locations. The image locations may be specified as the interior of a rectangular image window, or as the 1-valued elements of a bitmap such as that produced by FTLOC.

SPCONVP resamples spectra such that they have the same wavelength sampling as a specified data set. This is done by convolving the spectra with the data set's band response profiles (see Image metadata support). The original spectra may be read from any of the GDB-supported file formats for spectra input, and the resampled spectra may be written to any of the GDB-supported file formats for spectra output (see Basic features of the Hyperspectral Analysis package). All of the Hyperspectral Analysis package programs that read spectra and perform an image processing or analysis operation with them will perform the same resampling as SPCONVP does if necessary, as the spectra are input. However, using SPCONVP to resample a large set of spectra that will be used in many operations will reduce the computing time required for those operations.

SP2SP is a reformatting utility that reads spectra from any of the GDB-supported file formats for spectra input, and writes them to any of the GDB-supported file formats for spectra output (see Basic features of the Hyperspectral Analysis package).