Sentinel-1/2 derived Arctic Coastal Human Impact dataset (SACHI)

The SACHI (Sentinel-1/2 derived Arctic Coastal Human Impact) dataset has been primarily developed as part of the HORIZON2020 project Nunataryuk by b.geos (www.bgeos.com). It covers a 100km buffer from the Arctic Coast (land area), for areas with permafrost near the coast. It is based on Sentinel-1 and Sentinel-2 data from 2016-2020 using the algorithms described in Bartsch et al. (2020). It is a supplement to Bartsch et al. (2021 - https://iopscience.iop.org/article/10.1088/1748-9326/ac3176/meta). It consists of three shape files: 1) SACHI.shp - all identified objects with infrastructure/impact classes and auxiliary information (permafrost status and trends, nightlight radiance, vegetation zone, Normalized Difference Vegetation Index trends from Landsat, settlements names) 2) SACHI_100km_buffer - Buffer polygon (analyses extent) 3) SACHI_granules_acquisition_dates - processed Sentinel-2 granule extent polygons with dates of all used input data SACHI class values: 1=linear transport infrastructure, 2=buildings (and other constructions such as bridges), 3=other impacted area (includes gravel pads, mining sites) See README.TXT for description of data fields.SACHI（Sentinel-1/2衍生北极海岸人类影响）数据集主要由b.geos（www.bgeos.com）作为欧盟地平线2020（HORIZON2020）项目Nunataryuk的组成部分开发完成。该数据集覆盖北极海岸（陆地区域）周边100公里的缓冲范围，针对沿海分布多年冻土的区域。数据集以2016-2020年的Sentinel-1与Sentinel-2遥感数据为基础，采用Bartsch等人2020年发表的算法完成处理，同时为Bartsch等人2021年的相关研究（https://iopscience.iop.org/article/10.1088/1748-9326/ac3176/meta）提供补充资料。 本数据集包含三类矢量形状文件（shapefile）： 1. SACHI.shp：包含所有已识别的基础设施/影响类别地物及配套辅助信息，涵盖多年冻土状态与变化趋势、夜间灯光辐射强度、植被带类型、基于Landsat数据的归一化差异植被指数变化趋势以及居民点名称； 2. SACHI_100km_buffer：缓冲多边形（分析范围）； 3. SACHI_granules_acquisition_dates：附带所有所用输入数据采集日期的已处理Sentinel-2影像块范围多边形； SACHI的类别取值规则如下：1代表线性交通基础设施，2代表建筑物（及桥梁等其他构筑物），3代表其他受影响区域（包含砾石垫、采矿场地）。 有关数据字段的详细说明，请参阅README.TXT文件。