ISPRS-Archives ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ISPRS-Archives Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. 2194-9034 Copernicus Publications Göttingen, Germany 10.5194/isprs-archives-XLII-4-W5-127-2017 WATER VAPOUR WEIGHTED MEAN TEMPERATURE MODEL FOR GPS-DERIVED INTEGRATED WATER VAPOUR IN PENINSULAR MALAYSIA Musa T. A. 1 Mazlan M. H. 1 Opaluwa Y. D. 2 Musliman I. A. 1 Radzi Z. M. 3 Geomatic Innovation Research Group, Infocomm Research Alliance Faculty of Geoinformation & Real Estate, Universiti Teknologi Malaysia 81310, Johor Baharu, Malaysia Department of Surveying and Geoinformatics, School of Environmental Technology, Federal University of Technology Minna, Nigeria National Space Agency, Ministry of Science, Technology and Innovation, Malaysia Space Centre, 42700 Banting, Selangor, Malaysia 05 10 2017 XLII-4/W5 127 135 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ This article is available from https://isprs-archives.copernicus.org/articles/isprs-archives-XLII-4-W5-127-2017.html The full text article is available as a PDF file from https://isprs-archives.copernicus.org/articles/isprs-archives-XLII-4-W5-127-2017.pdf

This paper presents the development of T<sub>M</sub> model by using the radiosonde stations from Peninsular Malaysia. Two types of T<sub>M</sub> model were developed; site-specific and regional models. The result revealed that the estimation from site-specific model has small improvement compared to the regional model, indicating that the regional model is adequately to use in estimation of GPS-derived IWV over Peninsular Malaysia. Meanwhile, this study found that the diurnal cycle of T<sub>S</sub> has influenced the T<sub>M</sub>&ndash;T<sub>S</sub> relationship. The separation between daytime and nighttime observation can improve the relationship of T<sub>M</sub>&ndash;T<sub>S</sub>. However, the impact of diurnal cycle to IWV estimation is less than 1&thinsp;%. The T<sub>M</sub> model from Global and Tropic also been evaluated. The Tropic T<sub>M</sub> model is superior to be utilized as compared to the Global T<sub>M</sub> model.