NERO line NDVI

The NERO line is a permanent vegetation transect crossing all the dominating vegetation types found in the study area. The progression in the vegetation greenness (Normalized Difference Vegetation Index; NDVI) is followed on the NERO line one to two times per month throughout the snowfree season. NDVI is measured by a Crop Circle 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.NERO样线（NERO line）为一条永久性植被样带，贯穿研究区域内所有优势植被类型。在无雪季期间，每月会对该NERO样线开展1至2次植被绿度监测，监测指标为归一化差值植被指数（Normalized Difference Vegetation Index，NDVI）。NDVI采用Crop Circle手持系统（Crop Circle Handheld System）进行测量，扫描时需将传感器以约1米每秒的速度平稳向前移动，保持在植被上方约75厘米高度处，由此获得的测量覆盖范围约为10米×45米。如需进一步了解相关细节，请参阅该网站上发布的最新版BioBasis手册（BioBasis manual）。