Plot NDVI

The progression in the vegetation greenness (Normalized Difference Vegetation Index; NDVI) is followed in the plant phenology plots on a weekly basis. NDVI is measured by a RapidSCAN CS-45 Handheld System and scans are conducted by moving the sensor steadily forward (ca. 1 meter per second) approximately 75 cm above the vegetation. This results in a measuring footprint of approximately 10 x 45 m. For further details, please refer to the newest BioBasis manual available at the website.本研究按周度频次对植物物候样地内的植被绿度变化进行追踪，该绿度指标为归一化差分植被指数（Normalized Difference Vegetation Index，NDVI）。NDVI的测量采用RapidSCAN CS-45手持式系统完成，扫描时需以约1米每秒的速度匀速向前移动传感器，并将传感器保持在植被上方约75厘米的高度。该测量模式的单次覆盖范围约为10×45米。如需了解更多细节，请参阅官网发布的最新版BioBasis操作手册。