River channel evolution data of Yalong River（1986-2021）

The primary data consist of river width, river area, and centerline length for each section of the Lower Yalong River during wet and dry seasons. These data were obtained from remote sensing interpretation, validated by accuracy assessments against field measurements.The field data was collected from October 31 to November 2, 2004, covering a 3.89 km post-dam river section of the JP2 Dam, with 51 detailed survey transects set up. The arrangement of the transects prioritized data representativeness and distribution rationality, combined with onsite geological conditions, to achieve uniform distribution within permissible limits. Meanwhile, the water surface width at each transect was recorded.Water extraction part of the code:

本数据集的核心数据包含雅砻江下游各河段在丰水期与枯水期的河宽、水域面积及中心线长度。该类数据通过遥感解译获取，并以野外实测数据为参照完成精度验证。野外实测数据采集于2004年10月31日至11月2日，覆盖JP2大坝下游3.89千米的河段，共布设51条精细化勘测断面。断面布设以数据代表性与分布合理性为优先原则，结合现场地质条件，确保在允许范围内实现均匀分布。同时记录了每条断面的水面宽度。代码中的水体提取部分：