{
    "created": "2018-05-08 07:59:22",
    "updated": "2026-05-01 01:25:30",
    "id": "ea49f667-56d0-4509-802b-3a1cb3b826c0",
    "version": 2,
    "ds_topic": null,
    "title_cn": "中国地区被动微波SSM/I亮度温度数据集",
    "title_en": "Brightness and temperature data set of passive microwave SSM / I in China",
    "ds_abstract": "<p>本数据集中包括:使用美国国防气象卫星计划(DMSP)卫星所携带的星载微波辐射计SSM/I的微波亮度温度。包含1987年-2007年的19H，19V，22V，37H，37V，85H，85V七个通道的每日两次（升轨&amp;降轨）亮度温度。</p>\n\n<p>专用微波成像仪（Special Sensor Microwave/Image，SSM/I）由美国休斯公司研制，于1987年首次由美国国防气象卫星计划（DMSP）中的Block 5D-/F8卫星载入空间执行探测使命。从1987年DMSP升空到1997年TRMM升空的10年时间内，SSM/I一直是世界上最先进、空间分辨率最高的星载被动微波遥感探测仪器。DMSP卫星为近极地圆形太阳同步轨道，卫星高度约833 km，轨道面倾角98.8°，轨道周期102.2 min，地方时6时左右通过赤道，24h覆盖一次全球。SSM/I由设置在4个频率处的7个通道组成，中心频率分别为19.35、22.24、37.05和85.50 GHz。其仪器实际上是由7个相互独立的全功率型、平衡混频、超外差式接收的被动微波辐射计系统构成，可以同时测量来自地球和大气系统的微波辐射。除22.24 GHz频率外，其它频率均同时具有水平和垂直两种极化状态。</p>\n\n<p>SSM/I若干特征值</p>\n\n<p>通道  频率</p>\n\n<p>（GHz）   极化方式（V/H）   空间分辨率</p>\n\n<p>（km×km） 足迹大小</p>\n\n<p>（km）</p>\n\n<p>19V 19.35   V   25×25   56</p>\n\n<p>19H 19.35   H   25×25   56</p>\n\n<p>22V 22.24   V   25×25   45</p>\n\n<p>37V 37.05   V   25×25   33</p>\n\n<p>37H 37.05   H   25×25   33</p>\n\n<p>85V 85.50   V   12.5×12.5   14</p>\n\n<p>85H 85.50   H   12.5×12.5   14</p>\n\n<p>1、文件格式和命名：</p>\n\n<p>每组数据均由遥感数据文件，.JPG图像文件和.met辅助信息文件，以及.TIM时间信息文件和相应的.met时间信息辅助文件构成。</p>\n\n<p>SSMI_Grid_China目录下的每组数据文件名及命名规则如下：</p>\n\n<p>China-EASE-Fnn-ML/HaaaabbbA/D.ccH/V（遥感数据）</p>\n\n<p>China-EASE-Fnn -ML/HaaaabbbA/D.ccH/V.jpg （图像文件）</p>\n\n<p>China-EASE-Fnn-ML/HaaaabbbA/D.ccH/V.met（辅助信息文件）</p>\n\n<p>China-EASE-Fnn-ML/HaaaabbbA/D.TIM （时间信息文件）</p>\n\n<p>China-EASE- Fnn -ML/HaaaabbbA/D.TIM.met （时间信息辅助文件）</p>\n\n<p>其中：EASE代表EASE-Grid投影方式；Fnn代表搭载卫星编号（F08，F11，F13）；ML/H分别代表多通道低分辨率和多通道高分辨率；A/D分别代表升轨（A）和降轨（D）；aaaa代表年份；bbb代表该年的儒略日；cc代表通道号（19H，19V，22V，37H，37V，85H，85V）；H/V分别代表水平极化（H）和垂直极化（V）。</p>\n\n<p>2、坐标系及投影：</p>\n\n<p>投影方式为等积割圆柱投影，双标准纬线为南北纬30度。有关EASE-GRID的相关详细信息，请参考http://www.ncgia.ucsb.edu/globalgrids-book/ease_grid/。如果需要将EASE-Grid投影方式转换成Geographic投影方式，请参照ease2geo.prj文件，内容如下：</p>\n\n<p>Input</p>\n\n<p>projection cylindrical</p>\n\n<p>units meters</p>\n\n<p>parameters 6371228 6371228</p>\n\n<p>1   /* Enter projection type (1, 2, or 3)</p>\n\n<p>0 00 00 /* Longitude of central meridian</p>\n\n<p>30 00 00    /* Latitude of standard parallel</p>\n\n<p>Output</p>\n\n<p>Projection GEOGRAPHIC</p>\n\n<p>Spheroid KRASovsky</p>\n\n<p>Units dd</p>\n\n<p>parameters</p>\n\n<p>end</p>\n\n<p>3、数据格式：</p>\n\n<p>以整数形二进制存储，每个数据占2个字节。本数据集中实际存储的数据为亮温*10，读出数据后需除以10得到真实亮温。</p>\n\n<p>4、数据分辨率：</p>\n\n<p>空间分辨率：25km，12.5km (SSM/I 85GHz)；</p>\n\n<p>时间分辨率：逐日，从1978年至2007年。</p>\n\n<p>5、空间范围：</p>\n\n<p>经度：60°-140°东经；</p>\n\n<p>纬度：15°-55°北纬。</p>\n\n<p>6、数据读取：</p>\n\n<p>每一组数据包括遥感影像数据文件，.JPG图像文件和.met辅助信息文件，其中JPG文件可以用Windows图片和传真查看器打开，.met辅助信息文件可以用记事本打开，遥感影像数据文件可以在ENVI和ERDAS软件中打开。</p>",
    "ds_source": "",
    "ds_process_way": "",
    "ds_quality": "",
    "ds_acq_start_time": "1987-01-01 00:00:00",
    "ds_acq_end_time": "2007-12-31 00:00:00",
    "ds_acq_place": "中国",
    "ds_acq_lon_east": 135.5,
    "ds_acq_lat_south": 17.766666666666666,
    "ds_acq_lon_west": 73.19972222222222,
    "ds_acq_lat_north": 53.86666666666667,
    "ds_acq_alt_low": null,
    "ds_acq_alt_high": null,
    "ds_share_type": "login-access",
    "ds_total_size": 11176005067,
    "ds_files_count": 24,
    "ds_format": "栅格",
    "ds_space_res": null,
    "ds_time_res": "",
    "ds_coordinate": "WGS84",
    "ds_projection": "EASE-Grid Global Cylindrical Equal Area",
    "ds_thumbnail": "ea49f667-56d0-4509-802b-3a1cb3b826c0.png",
    "ds_thumb_from": 0,
    "ds_ref_way": "",
    "paper_ref_way": "",
    "ds_ref_instruction": "None",
    "ds_from_station": null,
    "organization_id": "9c4867b1-5cb1-4de0-abeb-df42547bf41e",
    "ds_serv_man": "寒区旱区科学数据中心",
    "ds_serv_phone": "0931-4967287",
    "ds_serv_mail": "ncdc@lzb.ac.cn",
    "doi_value": "",
    "subject_codes": [
        "170.4510"
    ],
    "quality_level": 3,
    "publish_time": "2020-12-31 11:53:15",
    "last_updated": "2023-08-23 16:46:49",
    "protected": false,
    "protected_to": null,
    "lang": "zh",
    "cstr": "11738.11.ncdc.Westdc.2020.350",
    "i18n": {
        "en": {
            "title": "Brightness and temperature data set of passive microwave SSM / I in China",
            "ds_format": "Raster",
            "ds_source": "",
            "ds_quality": "",
            "ds_ref_way": "",
            "ds_abstract": "<p>This data set includes the microwave brightness temperatures obtained by the spaceborne microwave radiometer SSM/I carried by the US Defense Meteorological Satellite Program (DMSP) satellite. It contains the twice daily (ascending and descending) brightness temperatures of seven channels, which are 19H, 19V, 22V, 37H, 37V, 85H, and 85V.</p>\n<p>The Specialized Microwave Imager (SSM/I) was developed by the Hughes Corporation of the United States. In 1987, it was first carried into the space on the Block 5D-/F8 satellite of the US Defense Meteorological Satellite Program (DMSP) to perform a detection mission. In the 10 years from when the DMSP soared to orbit in 1987 to when the TRMM soared to orbit in 1997, the SSM/I was the world's most advanced spaceborne passive microwave remote sensing detection instrument, having the highest spatial resolution in the world. The DMSP satellite is in a near-polar circular solar synchronous orbit; the elevation is approximately 833 km, the inclination is 98.8 degrees, and the orbital period is 102.2 minutes. It passes through the equator at approximately 6:00 local time and covers the whole world once every 24 hours. The SSM/I consists of seven channels set at four frequencies, and the center frequencies are 19.35, 22.24, 37.05, and 85.50 GHz. The instrument actually comprises seven independent, total-power, balanced-mixing, superheterodyne passive microwave radiometer systems, and it can simultaneously measure microwave radiation from Earth and the atmospheric systems. Except for the 22.24 GHz frequency, all the frequencies have both horizontal and vertical polarization states.</p>\n<p>Some Eigenvalues of SSM/I</p>\n<p>Channel Frequency</p>\n<p>(GHz) Polarization Mode (V/H) Spatial Resolution</p>\n<p>(km * km) Footprint Size</p>\n<p>(km)</p>\n<p>19V 19.35 V 25×25 56</p>\n<p>19H 19.35 H 25×25 56</p>\n<p>22V 22.24 V 25×25 45</p>\n<p>37V 37.05 V 25×25 33</p>\n<p>37H 37.05 H 25×25 33</p>\n<p>85V 85.50 V 12.5×12.5 14</p>\n<p>85H 85.50 H 12.5×12.5 14</p>\n<ol>\n<li>File Format and Naming:</li>\n</ol>\n<p>Each group of data consists of remote sensing data files, .JPG image files and .met auxiliary information files as well as .TIM time information files and the corresponding .met time information auxiliary files.</p>\n<p>The data file names and naming rules for each group in the SSMI_Grid_China directory are as follows:</p>\n<p>China-EASE-Fnn-ML/HaaaabbbA/D.ccH/V (remote sensing data);</p>\n<p>China-EASE-Fnn -ML/HaaaabbbA/D.ccH/V.jpg (image file);</p>\n<p>China-EASE-Fnn-ML/HaaaabbbA/D.ccH/V.met (auxiliary information document);</p>\n<p>China-EASE-Fnn-ML/HaaaabbbA/D.TIM (time information file); and</p>\n<p>China-EASE- Fnn -ML/HaaaabbbA/D.TIM.met (time information auxiliary file).</p>\n<p>Among them, EASE stands for EASE-Grid projection mode; Fnn represents carrier satellite number (F08, F11, and F13); ML/H represents multichannel low resolution and multichannel high resolution; A/D stands for ascending (A) and descending (D); aaaa represents the year; bbb represents the Julian day of the year; cc represents the channel number (19H, 19V, 22V, 37H, 37V, 85H, and 85V); and H/V represents horizontal polarization (H) and vertical polarization (V).</p>\n<ol>\n<li>Coordinate System and Projection:</li>\n</ol>\n<p>The projection method is an equal-area secant cylindrical projection, and the double standard latitude is 30 degrees north and south. For more information on EASE-GRID, please refer to http://www.ncgia.ucsb.edu/globalgrids-book/ease_grid/. If you need to convert the EASE-Grid projection method into a geographic projection method, please refer to the ease2geo.prj file, which reads as follows.</p>\n<p>Input</p>\n<p>Projection cylindrical</p>\n<p>Units meters</p>\n<p>Parameters 6371228 6371228</p>\n<p>1 /* Enter projection type (1, 2, or 3)</p>\n<p>0 00 00 /* Longitude of central meridian</p>\n<p>30 00 00 /* Latitude of standard parallel</p>\n<p>Output</p>\n<p>Projection GEOGRAPHIC</p>\n<p>Spheroid KRASovsky</p>\n<p>Units dd</p>\n<p>Parameters</p>\n<p>End</p>\n<ol>\n<li>Data Format:</li>\n</ol>\n<p>Stored as binary integers, each datum occupies 2 bytes. The data that are actually stored in this data set are the brightness temperatures *10, and after reading the data, they need to be divided by 10 to obtain true brightness temperature.</p>\n<ol>\n<li>Data Resolution:</li>\n</ol>\n<p>Spatial resolution: 25 km, 12.5 km (SSM/I 85 GHz);</p>\n<p>Time resolution: day by day, from 1978 to 2007.</p>\n<ol>\n<li>The Spatial Coverage:</li>\n</ol>\n<p>Longitude: 60°-140° east longitude;</p>\n<p>Latitude: 15°-55° north latitude.</p>\n<ol>\n<li>Data Reading:</li>\n</ol>\n<p>Each group of data includes remote sensing image data files, .JPG image files and .met auxiliary information files. The JPG files can be opened with Windows image and fax viewers. The .met auxiliary information files can be opened with notepad, and the remote sensing image data files can be opened in ENVI and ERDAS software.</p>",
            "ds_time_res": "",
            "ds_acq_place": "China",
            "ds_space_res": "",
            "ds_projection": "EASE-Grid Global Cylindrical Equal Area",
            "ds_process_way": "",
            "ds_ref_instruction": "In order to respect intellectual property rights, protect the rights and interests of data authors, expand the services of data centers, and evaluate the application potential of data, data users are invited to use the data\r\nStudents' research results (including published papers, treatises, data products and unpublished research reports, data products, etc.) shall be clearly indicated with data\r\nSource and data author. For data reprinted (secondary or multiple releases), the author must also indicate the source of the original data. The results published in Chinese refer to the following specifications\r\n: the data comes from the achievements published by \"Heihe plan data management center\" (http://westdc.westgis.ac.cn) in English, which are indicated according to the following specifications: the\r\ndata set is provided by Cold and Arid Regions Sciences Data Center at Lanzhou\r\n(http://westdc.westgis.ac.cn)"
        }
    },
    "submit_center_id": "ncdc",
    "data_level": 0,
    "license_type": "CC BY 4.0",
    "doi_reg_from": "reg_local",
    "cstr_reg_from": "reg_local",
    "doi_not_reg_reason": null,
    "cstr_not_reg_reason": null,
    "is_paper_in_submitting": false,
    "ds_topic_tags": [
        "亮度温度",
        "SSM/I"
    ],
    "ds_subject_tags": [
        "自然地理学"
    ],
    "ds_class_tags": [],
    "ds_locus_tags": [
        "中国"
    ],
    "ds_time_tags": [
        1987,
        2007
    ],
    "ds_contributors": [
        {
            "true_name": "晋锐",
            "email": "jinrui@lzb.ac.cn",
            "work_for": "中国科学院西北生态环境资源研究院",
            "country": "中国"
        },
        {
            "true_name": "车涛",
            "email": "chetao@lzb.ac.cn",
            "work_for": "中国科学院西北生态环境资源研究院",
            "country": "中国"
        }
    ],
    "ds_meta_authors": [
        {
            "true_name": "吴立宗",
            "email": "wulizong@pric.org.cn",
            "work_for": "国家极地科学数据中心",
            "country": "中国"
        }
    ],
    "ds_managers": [
        {
            "true_name": "晋锐",
            "email": "jinrui@lzb.ac.cn",
            "work_for": "中国科学院西北生态环境资源研究院",
            "country": "中国"
        }
    ],
    "category": "基础地理"
}