1.2012年6月26日在大满加密观测区超级站附近的TerraSAR-X样方进行了卫星过境地面同步观测。本数据集保存数据格式为矢量文件，空间位置即为各采样点位置（WGS84+UTM 47N），土壤水分等测量信息记录在属性文件中。
\n2.2012年6月4日在大满加密观测区超级站附近的TerraSAR-X样方进行了卫星过境地面同步观测。TerraSAR-X卫星搭载X波段的合成孔径雷达（SAR），该日过境影像为HH/VV极化，标称分辨率3 m，入射角介于22-24°，过境时间为19:03（北京时间），主要覆盖中游人工绿洲生态水文试验区。
", "ds_source": "1.TerraSAR-X卫星搭载X波段的合成孔径雷达（SAR），该日过境影像为HH/VV极化，标称分辨率3 m，入射角介于22-24°，过境时间为19:03（北京时间），主要覆盖中游人工绿洲生态水文试验区。本地面同步数据集可为发展和验证主动微波遥感反演土壤水分算法提供基本地面数据集。
\n2.获取了样方上约550个点，每个点2次观测，即对覆膜玉米地，在每个采样点进行2次观测，1次膜内（数据记录中标记为a），1次膜外（数据记录中标记为b）；西瓜地虽然也覆膜，但考虑到并非水平铺设，只测量非覆膜位置土壤水分（两次数据记录中标记均为b）。由于HDAS系统采用POGO便携式土壤传感器，观测获得土壤温度、土壤水分（体积含水量）、损耗正切、土壤电导率、土壤复介电实部及虚部。植被小组完成了生物量、LAI、植被含水量、株高、行垄距、叶绿素等的测量。
", "ds_process_way": "样方及采样策略：选择了超级站东南边的6个自然地块，面积约为100 m×100 m。样方西北角的一个地块为西瓜地，其他为玉米。\n
\n样方的选择依据是：（1）考虑了不同植被种类，即西瓜和玉米；（2）样方的大小考虑到了可见光像元，100 m见方的大小可以保证至少4个30 m像元落在其中；（3）样方的位置选在超级站附近，交通便利，北面有超级站的观测，东西两侧各有一个WATERNET节点，为今后融入这些观测提供了可能；（4）此外，在样方四周，也有一些明显地物点，能够保证今后对SAR影像的几何纠正比较准确。\n
\n考虑到影像的分辨率，同步观测中，以5 m为间隔，采集了21条样线（东西分布），每条线5 m间隔共21个点（南北方向），使用3台Hydraprobe Data Acquisition System （HDAS，参考文献2）同时测量，通过测绳上的刻度和移动样线来控制采样间隔以弥补不能使用手持GPS的不足。
\n", "ds_quality": "数据质量良好
", "ds_acq_start_time": "2012-06-26 00:00:00", "ds_acq_end_time": "2012-06-27 00:00:00", "ds_acq_place": "黑河流域", "ds_acq_lon_east": 100.37388888888889, "ds_acq_lat_south": 38.85305555555556, "ds_acq_lon_west": 100.37222222222222, "ds_acq_lat_north": 38.855000000000004, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 15097357, "ds_files_count": 3, "ds_format": "sbn", "ds_space_res": null, "ds_time_res": "时", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "a770b97f-d607-46dc-9404-4e40fdd7b080.png", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "本数据由“黑河生态水文遥感试验（HiWATER）”产生，用户在使用数据时请在正文中明确声明数据的来源，并在参考文献部分引用本元数据提供的引用方式。", "ds_from_station": null, "organization_id": "c94b3578-20da-4346-9de9-c702b6ca8983", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": null, "quality_level": 3, "publish_time": "2021-09-01 10:23:44", "last_updated": "2023-08-23 16:47:23", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1614", "i18n": { "en": { "title": "Heihe River eco hydrological remote sensing experiment: TerraSAR-X ground synchronous observation data set of Daman super station in the middle reaches of Heihe River Basin (June 4-June 26, 2012)", "ds_format": "", "ds_source": "1. TerraSAR-X satellite is equipped with X-band synthetic aperture radar (SAR). The transit image on that day is HH / VV polarization, the nominal resolution is 3 m, the incident angle is 22-24 °, and the transit time is 19:03 (Beijing time). It mainly covers the ecological and hydrological test area of Artificial Oasis in the middle reaches. The local surface synchronous data set can provide a basic ground data set for the development and verification of active microwave remote sensing soil moisture retrieval algorithm.\n
\n2. About 550 points on the quadrat were obtained, and each point was observed twice, that is, for the film covered corn field, twice were observed at each sampling point, once inside the film (marked as a in the data record) and once outside the film (marked as B in the data record); Although the watermelon field is also covered with film, considering that it is not laid horizontally, only the soil moisture at the non covered position is measured (marked b in both data records). Because the HDAS system adopts pogo portable soil sensor, the soil temperature, soil moisture (volume moisture content), loss tangent, soil conductivity, real and imaginary parts of soil complex dielectric are observed and obtained. The vegetation team completed the measurement of biomass, Lai, vegetation water content, plant height, row ridge distance, chlorophyll, etc", "ds_quality": "
Good data quality
", "ds_ref_way": "", "ds_abstract": "1. On June 26, 2012, the satellite transit ground synchronous observation was carried out in the TerraSAR-X quadrat near the super station in the Damon encrypted observation area. The data format of this data set is vector file, the spatial location is the location of each sampling point (WGS84 + UTM 47N), and the measurement information such as soil moisture is recorded in the attribute file.\n
\n2. On June 4, 2012, the satellite transit ground synchronous observation was carried out in the TerraSAR-X quadrat near the super station in the Damon encrypted observation area. TerraSAR-X satellite is equipped with X-band synthetic aperture radar (SAR). The daily transit image is HH / VV polarization, the nominal resolution is 3 m, the incident angle is 22-24 °, and the transit time is 19:03 (Beijing time). It mainly covers the ecological and hydrological test area of artificial oasis in the middle reaches
", "ds_time_res": "时", "ds_acq_place": "Heihe River Basin", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Quadrat and sampling strategy: six natural plots in the southeast of the super station are selected, with an area of about 100 m × 100 m。 One plot in the northwest corner of the quadrat is watermelon land, and the others are corn.\n
\nThe selection basis of quadrat is: (1) considering different vegetation types, namely watermelon and corn（ 2) The size of the quadrat takes into account the visible light pixels, and the size of 100 m square can ensure that at least four 30 m pixels fall in it（ 3) The location of the quadrat is near the super station, with convenient transportation. There are super station observations in the north and a waternet node on the East and west sides, which makes it possible to integrate these observations in the future（ 4) In addition, there are some obvious ground object points around the quadrat, which can ensure that the geometric correction of SAR image is more accurate in the future\n
(1) Different vegetation types, namely watermelon and corn, are considered（ 2) The size of the quadrat takes into account the visible light pixels, and the size of 100 m square can ensure that at least four 30 m pixels fall in it（ 3) The location of the quadrat is near the super station, with convenient transportation. There are super station observations in the north and a waternet node on the East and west sides, which makes it possible to integrate these observations in the future（ 4) In addition, there are some obvious ground object points around the quadrat, which can ensure that the geometric correction of SAR image is more accurate in the future\n
\nConsidering the resolution of the image, in the synchronous observation, 21 sample lines (east-west distribution) were collected at an interval of 5 m, with a total of 21 points (north-south direction) at an interval of 5 m for each line. Three hydroprobe data acquisition systems (HDAS, ref. 2) were used for simultaneous measurement, and the sampling interval was controlled by the scale on the measuring rope and moving sample lines to make up for the lack of using handheld GPS\n
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