2015年、2018年夏季 “一带一路”地区大型地表水体透明度遥感监测产品

a. 数据内容（数据文件、表名称，包含的观测指标内容）
1）2015和2018年“一带一路”大型湖泊水体透明度主要数据内容为“一带一路”地区大型湖泊透明度的空间分布图，湖泊透明度利用水色指数和色度角算法由MODIS图像反演得到。湖泊透明度反映了“一带一路”国家的湖泊水体清洁度良好情况；2）2015-2018年“一带一路”大型湖泊水体透明度变化率数据是在2015和2018年大型湖泊水体透明度数据基础上计算得到，反映每个大型湖泊2015-2018年的三年间透明度变化情况；3） “一带一路”国家2015和2018年大型湖泊平均透明度，通过对每个国家湖泊透明度求均值反映“一带一路”国家水体平均清洁度情况；4）“一带一路”国家2015和2018年大型湖泊清洁度良好比例。
b. 数据的时间范围
2015和2018年
c. 数据的空间范围、投影方式
空间范围：“一带一路”
投影方式：Geographic Coordinate System
d. 数据的量
数据量合计约<5mb
e. 数据类型（文献、属性、矢量、栅格、文本等）
数据1）2)为矢量；数据3）4）为文本
f. 数据更新的频度
暂不更新

a. Data Content (data files, table names, and included observation indicators)
1) The 2015 and 2018 major lake water transparency data for the Belt and Road Initiative (BRI): includes spatial distribution maps of major lake water transparency in the BRI region. Lake water transparency was retrieved from MODIS imagery using the water color index and chromaticity angle algorithms, and reflects the good water cleanliness status of lakes in BRI countries;
2) The 2015-2018 major lake water transparency change rate data for the BRI was calculated based on the 2015 and 2018 major lake water transparency datasets, reflecting the transparency changes of each major lake during the three-year period from 2015 to 2018;
3) The average transparency of major lakes in BRI countries in 2015 and 2018: the average value of lake transparency for each country is calculated to reflect the average water cleanliness status of BRI countries;
4) The proportion of lakes with good water cleanliness among major lakes in BRI countries in 2015 and 2018.

b. Temporal Coverage of the Dataset
2015 and 2018

c. Spatial Coverage and Projection Method
Spatial Coverage: Belt and Road Initiative (BRI) region
Projection Method: Geographic Coordinate System

d. Data Volume
Total data volume is approximately <5 MB

e. Data Type (literature, attribute, vector, raster, text, etc.)
Data 1) and 2) are vector data; Data 3) and 4) are text data

f. Data Update Frequency
No scheduled updates