2012年6月28-29日在盈科绿洲与花寨子荒漠PLMR样方进行了机载飞行地面同步观测。PLMR（Polarimetric L-band Multibeam Radiometer）是双极化（H/V）的L波段微波辐射计，中心频率1.413 GHz，带宽24 MHz，分辨率1 km （相对航高3 km），有6个beam同时观测，入射角为±7º，±21.5º，±38.5º，灵敏度<1K。飞行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被动微波遥感反演土壤水分算法提供基本地面数据集。\n
\n样方及采样策略：观测区位于张掖绿洲南缘-安阳滩荒漠过渡带，张（张掖）-大（大满）公路西侧，南北跨龙渠干渠，分为两部分，西南方向为1 km×1 km的荒漠样方，由于荒漠较为均质，在此1 km样方内采集5个点（四周各1点及中心点，实际测量过程中，可在沿路行走过程中多测几个点）的土壤水分，四个角点除对角线方向外，互相间隔600 m，西南角角点为花寨子荒漠站，便于与气象站数据比较。在东北侧，选择了面积2.4 km×2.4 km的大样方针对绿洲下垫面开展同步观测。样方的选择依据主要是考虑地表覆盖代表性、尽量避开民居和大棚、穿越绿洲农田以及南边的部分荒漠、可达性、观测（路途消耗）时间，以期获得与PLMR观测的亮度温度的比较。\n
\n本数据集包括土壤水分观测和植被观测两部分，前者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；植被采样信息记录在EXCEL表格中。
", "ds_source": "获取了样方上约500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）。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。植被参数观测选择在一些具有代表性的土壤水分采样点开展，完成了株高和生物量（植被含水量）的测量。
", "ds_process_way": "PLMR（Polarimetric L-band Multibeam Radiometer）是双极化（H/V）的L波段微波辐射计，中心频率1.413 GHz，带宽24 MHz，分辨率1 km （相对航高3 km），有6个beam同时观测，入射角为±7º，±21.5º，±38.5º，灵敏度<1K。飞行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被动微波遥感反演土壤水分算法提供基本地面数据集。
", "ds_quality": "28号观测从11:00AM左右开始，完成约1/3工作量，由于PLMR仪器问题和降雨的双重原因，4:00PM被迫停止观测。剩余工作量29号10:30AM-5:30PM完成。观测日期正值该区域内农田大面积灌溉，导致观测人员前行困难，田块难以进入，观测点位与预设点位有偏差。\n
\n数据：本数据集包括土壤水分观测和植被观测两部分，前者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；植被采样信息记录在EXCEL表格中。
", "ds_acq_start_time": "2012-06-28 00:00:00", "ds_acq_end_time": "2012-06-29 00:00:00", "ds_acq_place": "黑河流域, 中游人工绿洲试验区，黑河流域中游", "ds_acq_lon_east": 100.36999999999999, "ds_acq_lat_south": 38.91, "ds_acq_lon_west": 100.32, "ds_acq_lat_north": 38.79, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 54558106, "ds_files_count": 2, "ds_format": "excel", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "5a699019-61d2-49ab-aef2-5f55f05ae10b.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 09:12:03", "last_updated": "2023-08-23 16:47:50", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1604", "i18n": { "en": { "title": "Heihe River eco hydrological remote sensing experiment: Airborne plmr ground synchronous observation data set of Yingke oasis and huazhaizi desert in the middle reaches of Heihe River Basin (June 28-29, 2012)", "ds_format": "", "ds_source": "About 500 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). 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. Vegetation parameter observation was carried out at some representative soil water sampling points, and the plant height and biomass (vegetation water content) were measured
", "ds_quality": "Observation No. 28 started at about 11:00am and completed about 1 / 3 of the workload. Due to the dual reasons of plmr instrument problems and rainfall, the observation was forced to stop at 4:00pm. The remaining workload was completed at 10:30am-5:30pm on the 29th. The observation date coincides with the large-scale irrigation of farmland in the area, which makes it difficult for observers to move forward, the field is difficult to enter, and there is a deviation between the observation point and the preset point.\n
\nData: this data set includes two parts: soil moisture observation and vegetation observation. The former saves data in 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; Vegetation sampling information is recorded in Excel table
", "ds_ref_way": "", "ds_abstract": "From June 28 to 29, 2012, airborne flight ground synchronous observation was carried out in Yingke oasis and huazhaizi desert plmr quadrat. Plmr (polarimetric L-band multibeam radiometer) is a dual polarization (H / V) L-band microwave radiometer with center frequency of 1.413 GHz, bandwidth of 24 MHz, resolution of 1 km (relative altitude of 3 km), simultaneous observation of 6 beams, incident angle of ± 7 º, ± 21.5 º, ± 38.5 º, sensitivity & lt; 1K。 The flight 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 passive microwave remote sensing soil moisture retrieval algorithm.\n
\nQuadrat and sampling strategy: the observation area is located in the south edge of Zhangye Oasis anyangtan Desert Transition Zone, the west side of Zhang (Zhangye) - Da (Daman) highway, across the Longqu main canal from north to south, and is divided into two parts, 1 km in the southwest × For the 1km desert quadrat, because the desert is relatively homogeneous, the soil moisture of 5 points (1 point around and the center point. In the actual measurement process, several more points can be measured during walking along the road). The four corners are separated by 600m except the diagonal direction. The southwest corner is huazhaizi desert station, which is convenient for comparison with the data of meteorological station. On the northeast side, an area of 2.4 km was selected × Synchronous observation of oasis underlying surface is carried out according to the 2.4 km large-scale sample policy. The selection basis of quadrat is mainly to consider the representativeness of surface coverage, avoid residential houses and greenhouses as far as possible, cross oasis farmland and some deserts in the south, accessibility and observation (road consumption) time, so as to obtain the comparison with the brightness temperature observed by plmr.\n
\nThis data set includes two parts: soil moisture observation and vegetation observation. The former saves data in 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; Vegetation sampling information is recorded in Excel table
", "ds_time_res": "", "ds_acq_place": "Heihe River Basin, artificial oasis experimental area in the middle reaches, middle reaches of Heihe River Basin", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Plmr (polarimetric L-band multibeam radiometer) is a dual polarization (H / V) L-band microwave radiometer with center frequency of 1.413 GHz, bandwidth of 24 MHz, resolution of 1 km (relative altitude of 3 km), simultaneous observation of 6 beams, incident angle of ± 7 º, ± 21.5 º, ± 38.5 º, sensitivity< 1K。 The flight 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 passive microwave remote sensing soil moisture retrieval algorithm
", "ds_ref_instruction": "\nThis data is generated by \"Heihe eco hydrological remote sensing experiment (hiwater)\". When using the data, users should clearly state the source of the data in the text and quote the reference method provided by this metadata in the reference part." } }, "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", "地面同步观测", "土壤水分", "机载微波辐射计" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "黑河流域", "中游人工绿洲试验区", "黑河流域中游" ], "ds_time_tags": [ 2012 ], "ds_contributors": [ { "true_name": "马明国", "email": "mmg@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": "李新", "email": "lixin@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": "王树果", "email": "sgwang@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_managers": [ { "true_name": "马明国", "email": "mmg@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": "遥感及产品" }