A global map of planting years of plantations

The dataset has a spatial resolution of 30 m. It is in a GeoTIFF format and has three bands named "plantyear" ,"startyear" and "species", which describe the planting years and the species of trees, and the year in which Landsat TM, ETM+ and OLI data began to accumulate. The "startyear" band should be used as the Quality Assessment (QA) band for this dataset because the supplementary value from 1982 to the start year may contain erroneous LandTrendr estimates of planting years.<br>The values of the three bands range from 1981 to 2019, 0 to 2020 and 1 to 190, respectively. For the "plantyear" band, a value of 1981 means the planting year was before 1982, and values from 1982 to 2019 correspond to the planting years. A value of 0 in the "startyear" band indicates that no Landsat data from June to September was obtained for the pixel during the period 1982–2020. Values from 1 to 1981 are not present and values 1982–2020 show the year when Landsat data started to accumulate. Values 1–190 in the "species" band represent tree species provided by the SDPT.

该数据集空间分辨率为30米，采用GeoTIFF格式，包含三个波段，分别命名为"plantyear"、"startyear"与"species"，用于描述林木种植年份、树种以及Landsat TM、ETM+、OLI数据的开始累积年份。由于1982年至该起始年份的补充值可能存在LandTrendr算法对种植年份的错误估计，因此需将"startyear"波段作为本数据集的质量评估（Quality Assessment，QA）波段。
三个波段的取值范围分别为1981至2019、0至2020以及1至190。其中"plantyear"波段中，取值1981代表林木种植年份早于1982年，1982至2019的取值则对应实际种植年份；"startyear"波段中，取值0代表该像素在1982–2020年间未获取到6月至9月的Landsat数据，1至1981的取值不存在，1982至2020的取值则代表Landsat数据开始累积的年份；"species"波段中1至190的取值代表由SDPT提供的林木树种。

搜集汇总

背景与挑战

背景概述

该数据集是一个全球种植园种植年份的地图，空间分辨率为30米，包含种植年份、树木种类和Landsat数据开始积累的年份三个波段，适用于林业管理和环境研究。