Evaluation of Thermal Remote Sensing as a Low-Cost Regional Geothermal Exploration Technique in New Mexico. Final Report. Page: 35 of 55
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I
Interpretation of the image data began with the analysis of the
TIMS classification. Examination of the two-channel plot for this
classification clearly showed the relative temperature positions of all
twenty-four classes. A class-by-class examination showed that the
cooler classes closely corresponded to vegetation and cool, moist soils
along drainages. This observation is shown in Figure 8b, a printout of
the cooler classes around Tortugas Mountain. The mid-range temperature
classes showed a relatively close correlation to soils classes and
differences in vegetation density (Figure 8c). The warmer classes
clearly delineated the higher landforms which exposed a large proportion
of bare rock (Figure 8d). These features possessed higher temperatures
as an effect of solar heating rather than from a geothermal source. By
collecting predawn thermal IR data, the solar induced thermal
accumulations of the previous day were diminished allowing geothermal
temperature flow from within the earth to have its greatest impact on
surface temperature for a given diurnal cycle.
Figures 9a and b are color photographs of the classification of the
Goat Mountain and Tortugas Mountain areas, respectively. In both cases,
the red classes at A (i.e., the upper 1/3 of the classes) show warmer
temperatures, the green classes at B (i.e., the middle 1/3) show
intermediate temperatures, and the blue classes at C (i.e., the bottom
1/3) show cooler temperatures. The letter "D" points to an apparent
thermal plume feature. Due to the narrow range of the spectral values
of the TIMS data, the classification was not able to identify any
significant temperature patterns other than those attributable to
landforms. A multispectral classification is most successful when
surface terrain has differing spectral values from one channel to
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Inglis, Michael & Budge, Thomas K. Evaluation of Thermal Remote Sensing as a Low-Cost Regional Geothermal Exploration Technique in New Mexico. Final Report., report, March 1, 1985; Las Cruces, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1092584/m1/35/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.