The first value of INP is the name of the input image file. A second input file may be used to supply the wavelengths of the input channels. This second input file should be an ASCII file (no VICAR labels) in the form of a table. The wavelength values must be the first column (there need not be any other columns), and there must be one row per channel.
BANDS specifies the starting band desired, and the number of bands to be processed. If the first channel in the dataset is not Channel 1, the parameter ST_CHAN should also be specified.
This parameter denotes the first channel in the dataset to be included in the plotting. If the first channel in the dataset is not Channel 1, the parameter ST_CHAN should also be specified.
This parameter denotes the number of bands to be included in the plot.
This is the line number of the pixel to be plotted. If the spectrum of a region is wanted, the AREA parameter is used and this parameter is ignored.
This is the sample number of the pixel to be plotted. If the spectrum of a region is wanted, the AREA parameter is used and this parameter is ignored.
XAXIS indicates the full scale limits of the x-axis. If defaulted, the program chooses limits that completely span the range of the data plotted. In some cases, the program will adjust (widen) the user specified limits, in order to place the tic marks at reasonable values.
YAXIS indicates the full scale limits of the y-axis. If defaulted, the program
chooses limits that completely span the range of the data plotted. In some
cases, the program will adjust (widen) the user specified limits, in order to
place the tic marks at reasonable values.
In addition to the mean spectral values, the one standard deviation range
is also plotted, ifthe AREA option is chosen.
XLABEL is the title for the x-axis on plots printed on the laser printer. It is not used on any other plots. The default is "Channel".
YLABEL is the title for the y-axis on plots printed on the laser printer. It is not used on any other plots. The default is "DN".
If the average spectum of a region is desired, it may be specified using the AREA parameter. Up to fifty rectangular areas, specified by SL,SS,NL,NS, may be used to form the average spectrum. The areas need not be contiguous, and if two area overlap, those pixels are counted twice. If the AREA parameter is used, the LINE and SAMPLE parameters are ignored.
The channel wavelengths of certain sensors are known to this program. By specifying the name of the sensor, DN values are plotted against wavelengths (in micrometers) rather than channel number. If the sensor is not specified or not known, the channel number is used. As of April 2,1991, AVIRIS, TIMS, TM, 87AVIRIS, 90AVIRIS, and GEOSCAN wavelengths are known to this program.
This parameter indicates the channel number of the first channel to be plotted. It must be specified if the first channel in the input dataset is not Channel 1 of the sensor. If defaulted, ST_CHAN is assumed to be equal to the starting band (SB).
Specifying this parameter produces a plot of the cumulative DN values for the spectrum, and not the spectrum itself.
This parameter allows the user to place a title or line of annotation on the printed plot, session log, and standard output, if such products are produced. It may be up to 40 characters in length.
Specifying this parameter causes a table of the spectral values to be printed to the user and in the SESSION.LOG
In the default mode (SIGMA) for the spectrum of an area, the one standard deviation envelope about the mean spectrum is plotted. If NOSIGMA is specified, this envelope is not plotted. If the spectrum is for a single point, rather than an area, this keyword has no relevance, and is ignored.
This parameter is specified if the user wishes to exclude zero valued pixels from the compuation of the mean and stadard deviation.
If WINDOW is specified (the default), spectrum plots the graph in an IDL Xwindow. If PSCRIPT is specified, no interactive plotting is done, but a hardcopy PostScript plot is made. If NOPLOT is specified, printing is enabled, plotting is disabled, and there are no interactive pauses.