Sentinel-1数据下载与处理

Posted 2022-11-25 空中旋转篮球

1.论文来源介绍

论文链接：Estimation of biomass burning emissions by integrating ICESat-2, Landsat 8, and Sentinel-1 data - ScienceDirect

相应段落原文：Sentinel-1 Interferometric Wide swath (IW) Ground Range Detected (GRD) data, which provide backscatter signals of the land surface from dual-polarization (Dual Pol) of VV and VH, were downloaded from EarthData (https://earthdata.nasa.gov/). The Sentinel-1 GRD data are multi-look (one in range and four in azimuth) with a spatial resolution of 10 m (High Res). Using the Sentinel Application Platform (SNAP), the Sentinel-1 data were processed with Thermal Noise Removal, Calibration, Speckle Filter (Lee sigma filter), and Terrain Correction tools, converted to decibel (dB), and resized to 30 m spatial resolution.

数据下载地址：Earthdata | Earthdata (nasa.gov)

 2.数据下载方法介绍

点击上图中的Find Data按钮，

搜索Sentinel-1数据 

 点击第二个：

 

检索一下湖北的2020年的Sentinel-1A和Sentinel-1B数据：

 查看My project，数据量还挺大的：

 我们在筛选条件里面继续设置格式，选择Geotiff。

 上图中的Download按钮激活了，可以下载了。数据量太大，我们可以下载自己所需时间的数据，缩小时间范围减少数据。

数据的下载先记录到这里，后面再补充数据方法了。

3.数据处理

3.1软件下载安装

下载数据处理软件：Sentinel Application Platform (SNAP)

地址：SNAP Download – STEP

桌面如下：

正在自动安装一些插件 

3.2 处理过程

.Using the Sentinel Application Platform (SNAP), the Sentinel-1 data were processed with Thermal Noise Removal, Calibration, Speckle Filter (Lee sigma filter), and Terrain Correction tools, converted to decibel (dB)。

3.2.1Thermal Noise Removal

 3.2.2 Calibration

 3.2.3 Speckle Filter (Lee sigma filter)

3.2.4 Terrain Correction

这一步处理的时候需要在线下载srtm数据，速度极慢，建议直接下载，放置到指路径，我的默认路径是：C:\\Users\\RS001\\.snap\\auxdata\\dem\\SRTM 3Sec  软件也是默认安装的。

下载地址：SRTM Tile Grabber

3.2.5 converted to decibel (dB)