Two Decades of the Phenological Eyes Network (PEN): Past Achievements and Future Directions for Long-Term Environmental Monitoring
Taiga Sasagawa1, Kazuhito Ichii2, Hibiki Noda3, Tomoko Akitsu4, Toshiyuki Kobayashi5, Kenlo Nishida Nasahara5, Taku Saitoh6 and Hiroyuki Muraoka7, (1)Chiba University, Institute for Advanced Academic Research (IAAR), Chiba, Japan, (2)Chiba University, Center for Environmental Remote Sensing (CEReS), Chiba, Japan, (3)NIES National Institute for Environmental Studies, Earth System Division, Tsukuba, Japan, (4)Japan Aerospace Exploration Agency (JAXA), Earth Observation Research Center, Tsukuba, Japan, (5)University of Tsukuba, Institute of Life and Environmental Sciences, Tsukuba, Japan, (6)Gifu University, Center for Environmental and Societal Sustainability, Gifu, Japan, (7)The University of Tokyo, Graduate School of Agriculture and Life Sciences, Tokyo, Japan