RS DL
介绍
任务概述：Sentinel-1C继承了Sentinel-1系列的传统，为气候变化、灾害应对和海洋交通监测等多领域提供高分辨率雷达图像，恢复了与Sentinel-1A组成的双卫星星座的完整能力。 技术特点：Sentinel-1C配备C波段合成孔径雷达（SAR），能够全天候获取地表影像。它引入了自动识别系统（AIS），用于精确追踪船舶位置，加强海洋监测。 发射成功：火箭于欧洲中部时间22:20发射，00:04完成卫星入轨，ESA在00:12确认与卫星建立通信。
// Load the Sentinel-1 ImageCollection, filter to Jun-Sep 2020 observations.var sentinel1 = ee.ImageCollection('COPERNICUS/S1_GRD').filterDate('2020-06-01', '2020-10-01');// Filter the Sentinel-1 collection by metadata properties.var vvVhIw = sentinel1// Filter to get images with VV and VH dual polarization..filter(ee.Filter.listContains('transmitterReceiverPolarisation', 'VV')).filter(ee.Filter.listContains('transmitterReceiverPolarisation', 'VH'))// Filter to get images collected in interferometric wide swath mode..filter(ee.Filter.eq('instrumentMode', 'IW'));// Separate ascending and descending orbit images into distinct collections.var vvVhIwAsc = vvVhIw.filter(ee.Filter.eq('orbitProperties_pass', 'ASCENDING'));var vvVhIwDesc = vvVhIw.filter(ee.Filter.eq('orbitProperties_pass', 'DESCENDING'));// Calculate temporal means for various observations to use for visualization.// Mean VH ascending.var vhIwAscMean = vvVhIwAsc.select('VH').mean();// Mean VH descending.var vhIwDescMean = vvVhIwDesc.select('VH').mean();// Mean VV for combined ascending and descending image collections.var vvIwAscDescMean = vvVhIwAsc.merge(vvVhIwDesc).select('VV').mean();// Mean VH for combined ascending and descending image collections.var vhIwAscDescMean = vvVhIwAsc.merge(vvVhIwDesc).select('VH').mean();// Display the temporal means for various observations, compare them.Map.addLayer(vvIwAscDescMean, {min: -12, max: -4}, 'vvIwAscDescMean');Map.addLayer(vhIwAscDescMean, {min: -18, max: -10}, 'vhIwAscDescMean');Map.addLayer(vhIwAscMean, {min: -18, max: -10}, 'vhIwAscMean');Map.addLayer(vhIwDescMean, {min: -18, max: -10}, 'vhIwDescMean');Map.setCenter(-73.8719, 4.512, 9); // Bogota, Colombia
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