Spectral Unmixing Applied to Desert Soils for the - Naval ...
Spectral Unmixing Applied to Desert Soils for the - Naval ... Spectral Unmixing Applied to Desert Soils for the - Naval ...
Figure 24. This figure is a comparison between the imagery derived endmembers (top) and the spectra collected from Owens/Death Valley Mazourka Canyon (bottom). Looking at the two plots, one sees similarities between the two so it is feasible that using the collected spectral library may be useful as an endmember input for the AVIRIS imagery. 48
VI. RESULTS AND ANALYSIS Spectral libraries collected using the ASD spectrometer were analyzed to determine if differences could be seen in reflectance and absorption features of spectra between those collected before and after disturbance. This was primarily to determine if changes in soil characteristics could be immediately seen within the individual spectra. Upon examination there were visual differences in spectra collected from the same location before and after disturbance and they are illustrated in Figure 25 below. The most noticeable differences show up around 500 nm (0.5 µm), 1125 nm (1.13µm), and 2200 nm (2.2µm) and are regions of absorption features in the spectra. These changes show not only difference in apparent reflectance, but also show variation in the width and depth of the absorption features at these key locations when using the continuum removed function previously discussed. 49
- Page 17 and 18: LIST OF TABLES Table 1. This table
- Page 19 and 20: LIST OF ACRONYMS AND ABBREVIATIONS
- Page 21 and 22: I. INTRODUCTION A study published b
- Page 23 and 24: II. THE PHYSICS BEHIND REMOTE SENSI
- Page 25 and 26: sensitive a given sensor is to diff
- Page 27 and 28: Figure 3. From Green et al. (1998),
- Page 29 and 30: analyzing imagery spectra, it is mo
- Page 31 and 32: After data have been converted to r
- Page 33 and 34: Collins et al. (1997) was able to s
- Page 35 and 36: These purposes include, but are not
- Page 37 and 38: III. DESERT ECOSYSTEM CHARACTERISTI
- Page 39 and 40: sagebrush of Utah, Montana, and the
- Page 41 and 42: in desert regions include argids, o
- Page 43 and 44: 2. Biological Soil Crusts (BSCs) Bi
- Page 45 and 46: 2004), especially in cases where ma
- Page 47 and 48: IV. STUDY SITES The focus area of t
- Page 50 and 51: Figure 13. This figure illustrates
- Page 52 and 53: Following the uplift that occurred
- Page 54 and 55: the Mazourka Canyon OHV park betwee
- Page 56 and 57: wavelengths being analyzed to obtai
- Page 58 and 59: 2. Field Spectroscopy An Analytical
- Page 60 and 61: A spectral library was then built a
- Page 62 and 63: after atmospherically correcting th
- Page 64 and 65: where: is the mean corrected and no
- Page 66 and 67: also be seen in Figure 23. The leve
- Page 70 and 71: Figure 25. This figure shows ASD co
- Page 72 and 73: Looking at Figure 25 it is apparent
- Page 74 and 75: A. IMAGERY DERIVED ENDMEMBERS The i
- Page 76 and 77: Figure 28. The above shows some of
- Page 78 and 79: spectrometer, reflectance values we
- Page 80 and 81: such an inference can be made (Ben-
- Page 82 and 83: While this is lower than the hoped
- Page 84 and 85: While the lower value would initial
- Page 86 and 87: Figure 33. This figure shows the ad
- Page 88 and 89: Inset C of Figure 35 is the same da
- Page 90 and 91: However, the presences of BSCs are
- Page 92 and 93: A B C Figure 37. Inset A shows the
- Page 94 and 95: A B C Figure 38. Inset A shows a co
- Page 96 and 97: differences in the studies by other
- Page 98 and 99: small concentrations making them un
- Page 100 and 101: area making it possible to tell wha
- Page 102 and 103: Clark, R. N., Swayze, G. A., Livo,
- Page 104 and 105: Kruse, F. A., Boardman, J. W., and
- Page 106 and 107: Sharp, R. P., and Glazner, A. F., (
- Page 108: INITIAL DISTRIBUTION LIST 1. Defens
VI. RESULTS AND ANALYSIS<br />
<strong>Spectral</strong> libraries collected using <strong>the</strong> ASD spectrometer were analyzed <strong>to</strong><br />
determine if differences could be seen in reflectance and absorption features of spectra<br />
between those collected be<strong>for</strong>e and after disturbance. This was primarily <strong>to</strong> determine if<br />
changes in soil characteristics could be immediately seen within <strong>the</strong> individual spectra.<br />
Upon examination <strong>the</strong>re were visual differences in spectra collected from <strong>the</strong> same<br />
location be<strong>for</strong>e and after disturbance and <strong>the</strong>y are illustrated in Figure 25 below. The<br />
most noticeable differences show up around 500 nm (0.5 µm), 1125 nm (1.13µm), and<br />
2200 nm (2.2µm) and are regions of absorption features in <strong>the</strong> spectra. These changes<br />
show not only difference in apparent reflectance, but also show variation in <strong>the</strong> width and<br />
depth of <strong>the</strong> absorption features at <strong>the</strong>se key locations when using <strong>the</strong> continuum<br />
removed function previously discussed.<br />
49
Change language