THE EFFECT OF LESS THAN 2 MINUTES AND VIEWPOINT ON VEGETATION INDICES OBTAINED BY VENµS

Ittai Herrmann ¹ Manuel Salvoldi ² Arnon Karnieli ² Rom Tarshish ¹

¹The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot 7610001, Israel
²The Remote Sensing Laboratory, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker 84990, Israel

In Israel, Vegetation and Environment monitoring New Micro Satellite (VENµS) obtains 27 tiles in three strips: west (W), east (E), and south (S). The western strip is imaged first with forward view, then the eastern and southern strips are imaged with backward view. The focus of the current study is on ~320 km² in which tile S01 overlaps tile W08. This unique image acquisition allow exploring the combined effect of the time difference and view angle change on spectral data. Several locations with different vegetation types were chosen. Data analysis shows that the changes in vegetation indices values are in different trends for comparing the images of the different tiles on the same day. The trends are also changing for different vegetation types. This information will allow better understanding data analysis of VENµS data in Israel, in more locations, and might be useful for imagery obtained by other satellite-mounted sensors.

Ittai Herrmann

Hebrew University of Jerusalem