Ndwi-Based Technique for Detection of Change Dates of the Growing Seasons in Russian Subarctic

Abstract

ABSTRACT:The paper describes a technique for automated analysis of the annual graphs of Normalized Difference Water Index, which enables to allocate framing dates of the spring, summer and autumn growing seasons. The approach proposed and used for detection of growing season dates allows to detect beginning and ending dates for summer season (when the surface air temperature is above +10 °C), in addition to the detection of beginning date for spring season and ending date for autumn season (when the temperature is above +5 °C), as it described by some authors. We describe general idea of the analysis of NDWI annual graphs and some collisions in the graph data, which are possible when the graph is derived from the satellite imagery time series.

Toward the issue of determining the dates of the growing season change using vegetation index data

“…Характерным примером в данном случае являются графики годового хода NDWI, использованные авторами настоящего исследования ранее. Ранее выполненные исследования проводились на 4 тестовых участках, располагавшихся на территории Республики Коми, в Европейской части РФ; при этом использовались данные за 2000 ̶ 2015 годы [Panidi, Tsepelev, 2017; Паниди и др. 2018].…”