EVALUATION OF THE REFLECTIVE AND THERMAL BAND-BASED ALGORIHMS FOR SNOW COVER MAPPING IN KARAJ DAM WATERSHED

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ALI MOHAMMADI A.; JELOKHANI NEYARAKI MASOUMEH

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Journal: MODARRES HUMAN SCIENCES Year:2004 | Volume:8 | Issue:1 (TOME 32) Page(s): 117-132

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Title

EVALUATION OF THE REFLECTIVE AND THERMAL BAND-BASED ALGORIHMS FOR SNOW COVER MAPPING IN KARAJ DAM WATERSHED

Author(s)

ALI MOHAMMADI A. | JELOKHANI NEYARAKI MASOUMEH | Issue Writer Certificate

Keywords

SNOW COVER MAPPINGQ4

SNOW CLOUD DISCRIMINATIONQ4

AVHRRQ4

GISQ4

REFLECTIVE AND THERMAL BANDSQ4

Abstract

A Field measurement of snow cover is very expensive and time consuming and ‎usually it is performed in a limited number of stations. Now days, remote sensing ‎technology is used as a useful tool for SNOW COVER MAPPING. However, in spite of high ‎capability of satellite images, discrimination between snow and cloud because of ‎spectral overlap between them is one of the most important limitations‏. ‏‎‎ In this research, in order to study the possibility of snow and cloud discrimination, ‎NOAA-14 images have been used and three snow indexes including: T__3 - T__4, ‎R__4/(R_3)^1/2, A__2/R__3 have been calculated which are based on the combination ‎of REFLECTIVE AND THERMAL BANDS. The resulted images have been classified using the ‎band combination indexes and fuzzy-based maximum likelihood classifier (MLC). ‎Results of the accuracy assessment of snow (mean overall kappa= 0.831) indicate that ‎the referred algorithm could sufficiently separate the snow from no snow (e.g. cloud ‎and land). Snow cover changes were also detected using the subtraction method of ‎multi-temporal snow cover maps. The results of the analysis of topographic positions ‎‎(elevation, slope) indicate that the changed snow classes in comparison with ‎unchanged snow classes are mostly located on lower elevation and steeper slopes. ‎This observation is consistent with the theoretical expectations and approximately ‎confirms the validity of snow cover change maps‏.‏

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APA: Copy

ALI MOHAMMADI, A., & JELOKHANI NEYARAKI, MASOUMEH. (2004). EVALUATION OF THE REFLECTIVE AND THERMAL BAND-BASED ALGORIHMS FOR SNOW COVER MAPPING IN KARAJ DAM WATERSHED. MODARRES HUMAN SCIENCES, 8(1 (TOME 32)), 117-132. SID. https://sid.ir/paper/6930/en

Vancouver: Copy

ALI MOHAMMADI A., JELOKHANI NEYARAKI MASOUMEH. EVALUATION OF THE REFLECTIVE AND THERMAL BAND-BASED ALGORIHMS FOR SNOW COVER MAPPING IN KARAJ DAM WATERSHED. MODARRES HUMAN SCIENCES[Internet]. 2004;8(1 (TOME 32)):117-132. Available from: https://sid.ir/paper/6930/en

IEEE: Copy

A. ALI MOHAMMADI, and MASOUMEH JELOKHANI NEYARAKI, “EVALUATION OF THE REFLECTIVE AND THERMAL BAND-BASED ALGORIHMS FOR SNOW COVER MAPPING IN KARAJ DAM WATERSHED,” MODARRES HUMAN SCIENCES, vol. 8, no. 1 (TOME 32), pp. 117–132, 2004, [Online]. Available: https://sid.ir/paper/6930/en

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