该数据集的数据产品为MOD21KM和MYD021KM，是MODIS_1B级数据。\n
该数据集包含位于电磁光谱0.4μm至14.4μm区域的36个离散频段的校准和地理定位孔径辐射。这些数据来自MODIS_1A级原始辐射扫描。此外，可以通过了解太阳辐照，提供其他数据，包括质量标志、错误估计值和校准数据。可见光、短波红外和近红外测量仅在白天进行，而热红外区域（波段20-25、27-36）的辐射则持续测量。通道1和2的分辨率为250m，通道3到7的分辨率为500m，其余通道的分辨率为1km。\n
但是，对于MODIS_L1B_1km产品，250m和500m的波段辐射数据及其相关不确定性已聚合到1km分辨率。因此，整个通道数据集被引用到相同的空间和地理位置尺度。这些通道保留了数据的原始分辨率。这两个数据产品是校正过的1公里分辨率的对地观测数据，包括250m和500m重采样为1公里分辨率的数据。
\n渭河流域覆盖的条带是H26V05和H27V05，MOD021KM所包含条带H26V05的时间范围是2015-2016年以及2019-2020年；H27V05的时间范围是2015-2019年；每年大概有1500景左右（只包含白天数据）。MYD021KM所包含条带H27V05的时间范围是2015-2019年；每年大概有3000景左右（包含白天晚上的数据）。", "ds_source": "
数据来源于NASA官网(https://ladsweb.modaps.eosdis.nasa.gov)。", "ds_process_way": "
MODIS_1B数据是MODIS 44种系列数据产品中的一种，产品编号为MOD02 ( Terra-MODIS)/MYD02(Aqua-MODIS);是经过仪器标定的数据产品，但是没有经过大气校正，是包含有地理坐标产品的数据。", "ds_quality": "
数据质量良好。", "ds_acq_start_time": "2015-01-01 00:00:00", "ds_acq_end_time": "2020-12-31 00:00:00", "ds_acq_place": "渭河流域", "ds_acq_lon_east": 110.27444444444444, "ds_acq_lat_south": 33.69611111111111, "ds_acq_lon_west": 103.9713888888889, "ds_acq_lat_north": 37.40833333333333, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 7683103651961, "ds_files_count": 55022, "ds_format": "hdf", "ds_space_res": "1000m", "ds_time_res": "日", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "d2dc4470-c2cb-4118-b04a-b7c6bda3713b.png", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "0d5fea4e-6fd7-4c70-b28b-3f91204c579a", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "10.12072/ncdc.WRiver.db0041.2021", "subject_codes": [ "170.45" ], "quality_level": 3, "publish_time": "2022-10-09 09:15:49", "last_updated": "2025-05-29 17:27:53", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.WRiver.2021.39", "i18n": { "en": { "title": "MODIS Remote Sensing Dataset for the Weihe River Basin (2015-2020)", "ds_format": "hdf", "ds_source": "
Data from NASA official website（ https://ladsweb.modaps.eosdis.nasa.gov ).", "ds_quality": "
Data quality is good.", "ds_ref_way": "", "ds_abstract": "
The data products for this dataset are MOD21KM and MYD021KM, which are MODIS_1B level data.\n
This dataset contains calibrated and geolocated aperture radiances in 36 discrete frequency bands located in the 0.4 μm to 14.4 μm region of the electromagnetic spectrum. These data are derived from MODIS_1A level raw radiometric scans. In addition, other data, including quality flags, error estimates, and calibration data, can be provided from knowledge of solar irradiance. Visible, short-wave infrared and near-infrared measurements are made only during daylight hours, while radiation in the thermal infrared region (bands 20-25, 27-36) is measured continuously. The resolution is 250m for channels 1 and 2, 500m for channels 3 to 7, and 1km for the remaining channels.\n
However, for the MODIS_L1B_1km product, the 250m and 500m band radiation data and their associated uncertainties have been aggregated to 1km resolution. Therefore, the entire channel dataset is referenced to the same spatial and geographic location scale. The channels retain the original resolution of the data. The two data products are corrected 1km resolution Earth observation data, including 250m and 500m resampled to 1km resolution. \n
The strips covered by the Weihe River Basin are H26V05 and H27V05; MOD021KM contains strips H26V05 for the time period 2015-2016 and 2019-2020; H27V05 for the time period 2015-2019; roughly 1,500 sightings per year (only daytime data are included MYD021KM contains strips H27V05 with a time range of 2015-2019; roughly 3,000 views per year (including daytime and nighttime data).
", "ds_time_res": "日", "ds_acq_place": "Weihe River Basin", "ds_space_res": "1000m", "ds_projection": "", "ds_process_way": "MODIS_1B data is one of the 44 series of MODIS data products, product number MOD02 ( Terra-MODIS)/MYD02(Aqua-MODIS); it is a data product that has been calibrated by the instrument but has not been atmospherically corrected, and it is the data that contains the georeferenced product.", "ds_ref_instruction": "" } }, "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, "ds_topic_tags": [ "电磁波谱", "太阳辐射", "MODIS", "地理定位孔径辐射" ], "ds_subject_tags": [ "地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "渭河流域" ], "ds_time_tags": [ 2015, 2016, 2017, 2018, 2019, 2020 ], "ds_contributors": [ { "true_name": "张耀南", "email": "yaonan@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": "李红星", "email": "lihongxing@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": "敏玉芳", "email": "myf@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" }