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Explorative Study on Mapping Surface Facies of Selected Glaciers from Chandra Basin, Himalaya Using WorldView-2 Data
- Source :
- Remote Sensing; Volume 11; Issue 10; Pages: 1207, Remote Sensing, Vol 11, Iss 10, p 1207 (2019)
- Publication Year :
- 2019
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2019.
-
Abstract
- Mapping of surface glacier facies has been a part of several glaciological applications. The study of glacier facies in the Himalayas has gained momentum in the last decade owing to the implications imposed by these facies on the melt characteristics of the glaciers. Some of the most commonly reported surface facies in the Himalayas are snow, ice, ice mixed debris, and debris. The precision of the techniques used to extract glacier facies is of high importance, as the result of many cryospheric studies and economic reforms rely on it. An assessment of a customized semi-automated protocol against conventional and advanced mapping algorithms for mapping glacier surface facies is presented in this study. Customized spectral index ratios (SIRs) are developed for effective extraction of surface facies using thresholding in an object-based environment. This method was then tested on conventional and advanced classification algorithms for an evaluation of the mapping accuracy for five glaciers located in the Himalayas, using very high-resolution WorldView-2 imagery. The results indicate that the object-based image analysis (OBIA) based semi-automated SIR approach achieved a higher average overall accuracy of 87.33% (κ = 0.85) than the pixel-based image analysis (PBIA) approach. Among the conventional methods, the Maximum Likelihood performed the best, with an overall accuracy of 78.71% (κ = 0.75). The Constrained Energy Minimization, with an overall accuracy of 68.76% (κ = 0.63), was the best performer of the advanced algorithms. The advanced methods greatly underperformed in this study. The proposed SIRs show a promise in the mapping of minor features such as crevasses and in the discrimination between ice-mixed debris and debris. We have efficiently mapped surface glacier facies independently of short-wave infrared bands (SWIR). There is a scope for the transferability of the proposed SIRs and their performance in varying scenarios.
- Subjects :
- 010504 meteorology & atmospheric sciences
Science
Himalaya
0211 other engineering and technologies
02 engineering and technology
Structural basin
01 natural sciences
WorldView-2
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Remote sensing
geography
geography.geographical_feature_category
Pixel
Glacier
Snow
glacier facies
object-based image analysis
pixel-based image analysis
Debris
Thresholding
Statistical classification
Facies
General Earth and Planetary Sciences
Geology
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Database :
- OpenAIRE
- Journal :
- Remote Sensing; Volume 11; Issue 10; Pages: 1207
- Accession number :
- edsair.doi.dedup.....3288c6a913ccb7859157b6b7df36d77c
- Full Text :
- https://doi.org/10.3390/rs11101207