黑河综合遥感联合试验：临泽站加密观测区LAI观测数据集（2008年5月-7月）

2008年5月27日至7月11日在临泽站加密观测区用照相法测量LAI。观测仪器：佳能EOS40D相机和佳能EF15/28鱼眼镜头以及相机支架。观测地点：临泽站的五里墩农田样方、临泽站内样方、荒漠过渡带、杨树林。样方样带的分布和编号信息请参见元数据“黑河综合遥感联合试验：临泽站加密观测区样方样带布置”，样方位置见临泽站加密观测站样方样带坐标.xls。观测对象：玉米、荒漠灌丛、杨树。拍摄方法：大部分照片为从上向下拍摄，较高的作物拍摄时采取从下向上拍摄，特殊情况下，比如光线太强时，采取向下倾斜45度拍摄。具体拍摄情况见数据说明文档。存储方式：该数据包括拍摄的原始照片，以及用can_eye5.0软件处理以后的结果。原始照片格式为JPG，处理结果文件格式为Excel表格。测量时间：荒漠为2008-05-28、2008-05-30；临泽站内为2008-06-19、2008-06-25、2008-06-30、2008-07-03、2008-07-10、2008-05-27；五里墩为2008-06-03、2008-06-04、2008-06-03、2008-05-28、2008-05-30、2008-07-11、2008-06-29；杨树林为2008-05-30。
2008年5月27日至7月11日，在临泽站加密观测区用手工测量法测量LAI。观测样方：五里墩农田样方、临泽站内样方测量方案：利用直尺和三角板，抽样测量和记录叶片长和宽，样方作物总株数，样方大小，计算出作物的平均叶片面积，乘上样方内总株数，得出估算的作物总的叶片面积后，除以样方面积。用LI-3100测量了部分样本，并与手工测量值进行比较，得到修正参数来修正手工测量值。存储方式：此数据为处理后数据，文件格式为Excel表格，得到的是观测样方每天的LAI测量平均值。测量时间：2008-05-22、2008-05-23、2008-05-24、2008-05-28、2008-05-30、2008-07-11。

From May 27 to July 11, 2008, Leaf Area Index (LAI) was measured using the photographic method in the intensive observation area of Linze Station.
Observation instruments: Canon EOS 40D camera, Canon EF 15/28 fisheye lens, and camera tripod.
Observation sites: Wulidun farmland plots, plots inside Linze Station, desert transition zone, and poplar forest.
For the distribution and numbering information of plots and transects, please refer to the metadata "Heihe Comprehensive Remote Sensing Joint Experiment: Layout of Plots and Transects in the Intensive Observation Area of Linze Station", and the plot locations are listed in the file "Coordinates of Plots and Transects in the Intensive Observation Area of Linze Station.xls".
Observation targets: maize, desert shrubs, and poplar trees.
Photography method: Most photos were taken vertically downward; for taller crops, photos were taken vertically upward; in special cases such as excessive strong light, photos were taken at a 45-degree downward tilt. Specific shooting details are available in the data documentation.
Storage method: This dataset includes original photographed images and results processed with can_eye5.0 software. Original photos are in JPG format, and processed result files are in Excel spreadsheet format.
Measurement timelines: For desert areas: 2008-05-28, 2008-05-30; For plots inside Linze Station: 2008-05-27, 2008-06-19, 2008-06-25, 2008-06-30, 2008-07-03, 2008-07-10; For Wulidun area: 2008-05-28, 2008-05-30, 2008-06-03, 2008-06-04, 2008-06-03, 2008-06-29, 2008-07-11; For poplar forest: 2008-05-30.

From May 27 to July 11, 2008, LAI was measured using the manual method in the intensive observation area of Linze Station.
Observation plots: Wulidun farmland plots and plots inside Linze Station.
Measurement protocol: Using a ruler and triangle, sample and record the length and width of leaves, total number of crop plants in the plot, and plot size. Calculate the average leaf area per plant, multiply by the total number of plants in the plot to obtain the total leaf area of the crop, then divide by the plot area to estimate the LAI. Partial samples were measured using the LI-3100 instrument, and correction parameters were derived by comparing with manual measurement results to revise the manual LAI estimates.
Storage method: This dataset contains processed data in Excel spreadsheet format, presenting the daily average LAI values of the observation plots.
Measurement timelines: 2008-05-22, 2008-05-23, 2008-05-24, 2008-05-28, 2008-05-30, 2008-07-11.