Satellite based lake bed elevation model of Lake Urmia using time series of Landsat imagery@en

Lake bed elevation model of Lake Urmia. In the course of model generation, a time series of the extent of the lake surface was derived from 129 satellite images with different acquisition dates based on the Landsat sensors Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+), and Operational Land Imager (OLI). Due to the rapid shrinking of the lake during the last two decades, lake surface areas ranging from 890 km² to 6125 km² could be covered. The water edge of the various lake extents was then linked to the observed water level on the day of the satellite image acquisition. The resulting contour lines, covering water levels between 1270.04 m and 1278.42 m a.s.l. and thus representing the lakebed morphology in its shallow parts, were merged with existing data (deeper parts) and interpolated to generate a lake bed elevation model with a resolution of 30 × 30 m.乌尔米耶湖（Lake Urmia）湖床高程模型。在该模型的构建过程中，研究团队基于陆地卫星（Landsat）的专题制图仪（Thematic Mapper, TM）、增强型专题制图仪Plus（Enhanced Thematic Mapper Plus, ETM+）以及陆地成像仪（Operational Land Imager, OLI）传感器，从129景不同获取日期的卫星影像中提取得到该湖泊水面范围的时间序列。由于近二十年来该湖泊快速萎缩，本次数据集覆盖的湖泊水面面积范围为890平方千米至6125平方千米。随后将各湖泊范围的水岸线与对应卫星影像获取当日的实测水位数据进行关联。由此得到的等高线覆盖了1270.04米至1278.42米的海平面高程，对应表征了该湖床的浅水区形态；将这些等高线与现有深水区数据进行融合，并通过插值处理生成了分辨率为30×30米的湖床高程模型。