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<br />l\"""J"u3 <br />u"J L, .J <br /> <br />streams for which water samples had been collected <br />The analog, data from the television-camera system <br />values for analysis using the Image-100 System. <br /> <br />and analyzed <br />were converted <br /> <br />(fig. In. <br />to digital <br /> <br />Both the color and the color-infrared film have three emulsion layers. <br />These layers are sensitive to blue, green, and red wavelengths of light for <br />color film, and green, red, and near-infrared wavelengths of light for color- <br />infrared film. Each of these light-sensitive layers was digitized separately <br />by using the appropriate filters on the television camera to mask out the <br />light from the other two layers. This, in effect, provides three spectral <br />bands of information for each transparency that is digitized. <br /> <br />The Image-100 System was used to generate the range and mean values of <br />the digital numbers (reflectances expressed as digital values) in each of the <br />three spectral bands depicted on the photographic transparencies. This was <br />accomplished for each of the eight sampiing stations listed in table 5 using <br />both the color and the color-infrared transparencies. The color-infrared <br />transparencies did not contain sufficient contrast in this instance for <br />correlation with turbidity values, so no further analysis was accomplished <br />using these data. <br /> <br />The digital numbers and their statistics obtained from the color <br />transparencies are presented in table 6. The graphic relationship between <br />measured turbidity values and mean digital values for each of the spectral <br />bands is shown on figure 18. Additionally, a set of second-order polynomial <br />regressions was developed from these data which use mean digital numbers to <br />predict turbidity for each of the spectral bands. Regression equations and <br />associated statistics including R2 (goodness of fit) values are presented in <br />table 7. <br /> <br />Table 6.--Digital peflected-enepgy values and associated statistics <br /> calculated fporn analysis of colop tY'anspapencies <br /> Blue layer Green layer Red layer <br />Site1 Vari - Vari - Vari- <br /> Range Mean Range Mean Range Mean <br /> ance ance ance <br />Y-OA-- 6-14 10.1 3.8 12-23 18.8 9.2 3-12 7.4 3.9 <br />Y-l n_ 14-20 17.5 6.8 32-47 41. 0 31. 5 13-18 16.0 4.5 <br />Y-17-- 7-13 9.6 1.4 9-15 13.0 2.8 4-11 7.0 2.7 <br />Y-39n 3-8 5.4 1.2 5-12 9.2 3.4 1-8 2.4 1.7 <br />Y-40n 10-10 10.0 0.0 27-27 27.0 0.0 9-9 9.0 0.0 <br />Y-47-- 5-9 7.5 1.5 5-13 10.6 4.1 0-9 4.9 2.0 <br />Y-64n 3-7 4.5 2.3 8-14 10.0 5.5 0-2 1.0 0.5 <br />Y-71n 2-6 3.8 3.2 1-5 3.3 2.2 0-3 1.8 1.7 <br />lSee f i gu re 17. <br /> 37 <br />