原标题：海洋一号卫星应急观测苏伊士运河货轮搁浅
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△苏伊士运河货轮搁浅遥感影像图
2021年3月23日，一艘巨型集装箱货轮在苏伊士运河发生船舶搁浅事故，导致航道双向封锁。自然资源部国家卫星海洋应用中心在3月25日下午16时许获悉该消息后，即刻对海洋一号C、D两颗卫星的飞行轨道进行计算，确定D星将在当天19时飞越苏伊士运河上空。
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△苏伊士运河应急观测区域覆盖情况
据悉，任务明确后，该中心立刻联系西安卫星测控中心提出临时增加测控圈次的需求，获取了唯一的指令上注弧段，此刻，距离上注圈次的起始时刻已不足20分钟。随后，业务人员制作了D星在苏伊士运河上空开机观测的任务计划并生成卫星工作指令，又对星上已有业务指令进行分析，确定计划指令同星上指令无冲突，在测控圈次开始前不到1分钟的时候将指令发给了测控中心，最终完成本次应急观测指令的上注。
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△苏伊士运河货轮搁浅遥感影像图