channel 1 (x1) channel 2 (x2) ... coverage
For a three channel remote-sensing data the following is an example of input ASCII file
- 0.4350 0.2616 0.7016 0.98
- 0.4140 0.2620 0.6520 0.99
- 0.4940 0.3500 0.5580 0.34
- 0.5983 0.5350 0.5650 0.10
- 0.4883 0.3733 0.5533 0.88
- 0.4150 0.2916 0.5116 0.60
- 0.5566 0.5250 0.5466 0.09
- 0.4420 0.2820 0.6800 0.86
- 0.4220 0.2620 0.6260 0.88
- 0.4766 0.3666 0.5933 0.61
- 0.5180 0.4300 0.5140 0.60
- 0.4416 0.2700 0.7383 0.96
- 0.4583 0.3116 0.5133 0.76
- 0.4300 0.2750 0.7233 0.98
- 0.4320 0.2760 0.6460 1.00
- 0.4733 0.3566 0.5616 0.53
- 0.4200 0.2450 0.7966 1.00
- 0.4850 0.3533 0.7216 0.99
- 0.4360 0.2620 0.7620 0.99
- 0.4283 0.2650 0.6783 0.91
- 0.4633 0.3200 0.6750 0.94
The resulted regression model (coefficient numbers) and related information about the confidencial test, goodness or utility test (e.g., correlation coefficient r between observed and calculated coverage, F value and t value) are put on the output file (ASCII file also).
r.linear.regression will be run non-interactively if the user specifies program arguments on the command line, using the form:
r.linear.regression input=name output=name
But after run, the computer will prompt the user to select model number. Alternately, the user can simply type: r.linear.regression on the command line without program arguments. In this case, the user will be prompted for parameter values using the standard GRASS user interface described in the manual entry for parser.
SEE ALSO
i.rvi, i.ndvi
AUTHORS
Hong C. Zhuang, U.S. Army Construction Engineering Research Laboratory Department of Electrical Computer Engineering, University of Illinois at Urbana-Champaign.
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory.