Stream network for the SAFE Project derived from SRTM data

<b>Description: </b>This zipfile contains linear geometries showing a channel network across the SAFE Project landscape. The network was calculated using the GRASS hydrology tool <code>r.stream.extract</code> from SRTM elevation data and the resulting flow accumulation predictions (see https://zenodo.org/record/3490488 and https://zenodo.org/record/3490687).<br><br>Note that these networks are derived entirely from remotely sensed data, but do form a single interconnected network across the wider SAFE landscape. Other stream network data are available () but the provenance of these are not well known and they only cover part of the SAFE network.<br><br>Details of the geoprocessing can be found here: https://www.safeproject.net/dokuwiki/safe_gis/stream_networks.<b>Project: </b>This dataset was collected as part of the following SAFE research project: <b>SAFE CORE DATA</b><b>XML metadata: </b>GEMINI compliant metadata for this dataset is available here<b>Files: </b>This dataset consists of 2 files: SAFE_SRTM_Stream_network_metadata.xlsx, SRTM_Channels_network.zip<b>SAFE_SRTM_Stream_network_metadata.xlsx</b>This file only contains metadata for the files below<b>SRTM_Channels_network.zip</b>Description: Shapefile containing 54413 calculated segments forming a channel network across the wider SAFE landscape.This file contains 1 data tables:<b>Feature properties</b> (described in worksheet Properties)Description: Field descriptions for shapefile propertiesNumber of fields: 17Number of data rows: Unavailable (table metadata description only).Fields: <b>cat</b>: Identity of segment (Field type: id)<b>type_cd</b>: Segment type (see also type) (Field type: numeric)<b>ID</b>: Identity of segment (Field type: id)<b>length</b>: Length of network segment (Field type: numeric)<b>n_ponts</b>: Number of points in segment (Field type: numeric)<b>sourceX</b>: X coordinate of source point of segment (Field type: numeric)<b>sourceY</b>: Y coordinate of source point of segment (Field type: numeric)<b>sinkX</b>: X coordinate of sink point of segment (Field type: numeric)<b>sinkY</b>: Y coordinate of sink point of segment (Field type: numeric)<b>type</b>: Segment type - is the segment a source or outflow segment (connected at one end only, type_cd = 0) or internal (connected at both ends, type_cd=1) (Field type: categorical)<b>snkChnn</b>: Identity of sink channel for this segment (Field type: id)<b>srcChnn</b>: Identities of source channels for this segment (Field type: id)<b>nSourcs</b>: Count of source channels (Field type: numeric)<b>sorcElv</b>: Elevation of start point of segment (Field type: numeric)<b>sinkElv</b>: Elevation of sink point of segment (Field type: numeric)<b>sorcFlw</b>: Incoming flow at segment source (Field type: numeric)<b>sinkFlw</b>: Outgoing flow at segment sink (Field type: numeric)<b>Date range: </b>2010-10-01 to 2019-10-01<b>Latitudinal extent: </b>4.0223 to 5.9761<b>Longitudinal extent: </b>116.0242 to 117.9758<b>数据集说明：</b>本压缩包包含用于展示SAFE项目研究区域内河道网络的线性几何要素。该河道网络通过GRASS（地理资源分析支持系统）水文工具<code>r.stream.extract</code>，基于SRTM（航天飞机雷达地形测绘任务，Shuttle Radar Topography Mission）地形高程数据及对应的流量累积预测结果计算得到（详见https://zenodo.org/record/3490488与https://zenodo.org/record/3490687）。 需注意，本河道网络完全由遥感数据衍生而来，且在整个SAFE研究区域内构成单一连通的网络。另有其他河道网络数据可供获取，但来源不明且仅覆盖SAFE研究区域的部分范围。 地理处理的详细步骤可参见：https://www.safeproject.net/dokuwiki/safe_gis/stream_networks。 <b>项目信息：</b>本数据集为以下SAFE科研项目的组成部分：<b>SAFE CORE DATA</b> <b>XML元数据：</b>本数据集符合GEMINI标准的元数据可在此处获取。 <b>文件列表：</b>本数据集包含2个文件：SAFE_SRTM_Stream_network_metadata.xlsx与SRTM_Channels_network.zip。 <b>SAFE_SRTM_Stream_network_metadata.xlsx</b>该文件仅包含下述文件的元数据信息。 <b>SRTM_Channels_network.zip</b>数据集说明：该压缩包内含Shapefile格式数据，包含54413条计算得到的河段，用于展示SAFE研究区域内的河道网络。 本文件包含1张属性数据表： <b>要素属性</b>（属性说明详见工作表"Properties"） 字段说明：用于描述Shapefile的属性字段 字段总数：17个 数据行数：未提供（仅包含表元数据说明）。 字段详情： <b>cat</b>：河段标识（字段类型：标识型） <b>type_cd</b>：河段类型编码（详见字段type）（字段类型：数值型） <b>ID</b>：河段标识（字段类型：标识型） <b>length</b>：河段长度（字段类型：数值型） <b>n_ponts</b>：河段包含的点数（字段类型：数值型） <b>sourceX</b>：河段起点的X坐标（字段类型：数值型） <b>sourceY</b>：河段起点的Y坐标（字段类型：数值型） <b>sinkX</b>：河段终点的X坐标（字段类型：数值型） <b>sinkY</b>：河段终点的Y坐标（字段类型：数值型） <b>type</b>：河段类型——区分源河段/泄流河段（仅单端连通，type_cd=0）与内部河段（两端均连通，type_cd=1）（字段类型：分类型） <b>snkChnn</b>：本河段的汇流河道标识（字段类型：标识型） <b>srcChnn</b>：本河段的上游源河道标识（字段类型：标识型） <b>nSourcs</b>：上游源河道数量（字段类型：数值型） <b>sorcElv</b>：河段起点的高程（字段类型：数值型） <b>sinkElv</b>：河段终点的高程（字段类型：数值型） <b>sorcFlw</b>：河段起点的入流量（字段类型：数值型） <b>sinkFlw</b>：河段终点的出流量（字段类型：数值型） 时间范围：2010年10月1日至2019年10月1日 纬度范围：4.0223~5.9761 经度范围：116.0242~117.9758