Spatial modelling of rainfall trends using satellite datasets and geographic information system. Issue 10 (27th July 2017)

• Record Type: Journal Article
• Authors: Kumar, Sanjay; Machiwal, Deepesh; Dayal, Devi
• Is Part Of: Hydrological sciences journal. Volume 62:Issue 10(2017)
• Page Start: 1636
• Page End: 1653
• Publication Date: 2017-07-27
• Subjects: rainfall -- satellite dataset -- trend -- statistical test -- geographic information system (GIS); Hydrology -- Periodicals; 551.4805
• DOI: 10.1080/02626667.2017.1304643
• Languages: English
• ISSNs: 0262-6667

Abstract

ABSTRACT: This study developed a standard methodology for identifying spatial trends using satellite-based raster datasets. It involves the novelty of exploring the capabilities of a geographic information system in implementing the procedures of three trend tests, the Spearman rank order correlation (SROC) test, the Kendall rank correlation (KRC) test and the Mann-Kendall (MK) test, on raster datasets of the Tropical Rainfall Measuring Mission at 0.25° × 0.25° resolution. Comparative evaluation of the three tests revealed fair agreement of a major part of the test results for pre-, post- and non-monsoon and one-day maximum rainfall. Also, similar results from KRC and MK tests were obtained over a considerable area for annual, monsoon and monthly maximum rainfall. These findings suggest the importance of selecting the appropriate test depending on rainfall magnitudes at the chosen time scale and emphasize the robustness of the KRC and MK tests.