吴起县黄土高原退耕还林区时间序列正射产品

A time series orthophoto dataset of Wuqi County:a typical returning farmland to forest area on the Loess Plateau

针对2013–2018年黄土高原退耕还林区(陕西省延安市吴起县及其周边地区)的130景高分一号宽幅卫星遥感数据,以Landsat 8全色正射镶嵌影像作为参考影像,通过影像自动匹配方法获取影像控制点,采用L1范数约束的最小二乘法对影像自带RPC模型进行修正,然后基于修正后的RPC模型和DEM数据对原始影像进行正射校正,得到吴起县及其周边地区的时间序列正射产品。影像数据包含可见光及近红外波段,空间分辨率为16 m,平面几何精度优于2个像元。本数据集将持续更新,可为深入研究黄土高原地区退耕还林还草成效及其生态、经济效应等提供数据支撑。

This dataset of a time series orthophoto products is based on the data from the 130-scene GF-1 WFV satellite of the Returning Farmland to Forest Area on Loess Plateau(Wuqi County and its surrounding areas,Yan’an City,Shaanxi Province)from 2013 to 2018.Firstly,we used landsat-8 full-color orthophotos as reference images,and obtained image control points through automatic image matching.Secondly,we used the L1 norm-constrained least square method to modify the RPC model with the image.Finally,we orthorectified the original image based on the modified RPC model and DEM data and obtained the time series orthophoto dataset of Wuqi County and its surrounding areas.The image data(spatial resolution 16 m)include visible light and near-infrared bands and the plane geometric accuracy is higher than 2 pixels.This dataset will be kept updated,and can provide data support for in-depth research on the effects of returning farmland to forest and grassland on the Loess Plateau and its ecological and economic effects.