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Author: Admin | 2025-04-28
Radiance spectrum with envelope removal. Figure 4. Radiance spectrum and radiance spectrum with envelope removal. Figure 5. The result of wavelet transform singularity detection. (a) The db5 wavelet two-layer decomposition result of a target object spectral curve; (b) The singularity of a target object spectral curve (2000–2400 nm); (c) The db5 wavelet two-layer decomposition result of a common object spectral curve; (d) The singularity of a common object spectral curve (2000–2400 nm). Figure 5. The result of wavelet transform singularity detection. (a) The db5 wavelet two-layer decomposition result of a target object spectral curve; (b) The singularity of a target object spectral curve (2000–2400 nm); (c) The db5 wavelet two-layer decomposition result of a common object spectral curve; (d) The singularity of a common object spectral curve (2000–2400 nm). Figure 6. (a) The band ratio image of the industrial smelting area; (b) The elevated CH4 locations are clearly visible with local CH4 enhancement in ppm·m. Figure 6. (a) The band ratio image of the industrial smelting area; (b) The elevated CH4 locations are clearly visible with local CH4 enhancement in ppm·m. Figure 7. (a) The 48 endmembers extracted with PPI from the SASI reflectance image; (b) The 6 yellow and grey sandy soils spectral curves measured in the field by Analytical Spectral Devices Inc., Boulder, CO, USA (ASD); (c) The 6 yellow and grey sandy soils spectra re-sampled to SASI resolution; (d) The spectra minimum of soils containing CH4 (the content of CH4 was higher than 300 uL/kg); (e) The spectra minimum of soils with the content of CH4 was 14 uL/kg); (f) The reference spectra used for SAM classification. Figure 7. (a) The 48 endmembers extracted with PPI from the SASI reflectance image; (b) The 6 yellow and grey sandy soils spectral curves measured in the field by Analytical Spectral Devices Inc., Boulder, CO, USA (ASD); (c) The 6 yellow and grey sandy soils spectra re-sampled to SASI resolution; (d) The spectra minimum of soils containing CH4 (the content of CH4 was higher than 300 uL/kg); (e) The spectra minimum of soils with the content of CH4 was 14 uL/kg); (f) The reference spectra used for SAM classification. Figure 8. (a) CH4 release sources mapped from SASI reflectance data; (b) Field photograph showing the oil shale mining pit. Figure 8. (a) CH4 release sources mapped from SASI reflectance data; (b) Field photograph showing the oil shale mining pit. Figure
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