本数据集以1中国AVHRR逐日无云5km积雪面积产品数据集(1980-2020年)为基础，引入连续积雪天数，完成基于稳定性的中国积雪类型划分。将我国积雪主要分为了强稳定积雪、次稳定积雪、周期性不稳定积雪、非周期稳健不稳定积雪、非周期波动不稳定积雪。数据包含一幅图件和一个栅格文件。采用完全开放共享。", "ds_source": "
1980-2020年AVHRR逐日无云积雪面积产品是积雪类型划分的基础数据，该数据由本项目第二课题研发生产。", "ds_process_way": "
在数据源获取基础上，将每年9月1日至次年8月31日定义为一个积雪年，统计一个积雪年内连续有积雪出现天数的最大值，记为该年连续积雪天数（CSCD），将一个积雪年内有积雪记录第一天至最后一天的合计天数记为该积雪年积雪期（SD），将一个积雪年内累计积雪天数记为该积雪年积雪天数（SCD），将积雪天数与积雪期比值记为该积雪年积雪波动率（R）；\n
在统计逐年连续积雪天数和积雪期基础上，统计有积雪记录超过10年（含10年）的栅格，10年以下记录的栅格记为0，不参与积雪分类统计；\n
质量控制基础上，统计各栅格多年平均连续积雪天数、积雪期、积雪天数和积雪波动率；\n
得到1980-2020年中国积雪稳定性类型划分图集；\n
其中0.72和0.14分别为R在连续积雪超过30天和少于10天范围内各栅格R值的统计中值。", "ds_quality": "
利用1980-2020年AVHRR逐日无云积雪面积产品数据，进行积雪日数资料的规范化整理、质量控制、分析和归类而成。", "ds_acq_start_time": "1980-01-01 00:00:00", "ds_acq_end_time": "2000-12-31 00:00:00", "ds_acq_place": "中国", "ds_acq_lon_east": null, "ds_acq_lat_south": null, "ds_acq_lon_west": null, "ds_acq_lat_north": null, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 26763125, "ds_files_count": 2, "ds_format": "tif.jpg", "ds_space_res": "5 km*5 km", "ds_time_res": "", "ds_coordinate": "CGCS2000", "ds_projection": "正轴等角圆锥", "ds_thumbnail": "497b27a4-af5e-479e-a514-cf4421c2fc14.jpg", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "钟歆玥，郝晓华. 中国科学院西北生态环境资源研究院.中国1:100万积雪稳定性分类图(1980-2020年).2020.", "ds_from_station": null, "organization_id": "aba68fe5-65d3-41b1-b036-bc274a834b5e", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967592", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "10.12072/ncdc.isnow.db2710.2023", "subject_codes": [ "170.45" ], "quality_level": 3, "publish_time": "2023-01-25 16:54:02", "last_updated": "2024-08-14 09:39:47", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.isnow.db2710.2023", "i18n": { "en": { "title": "1: 1000000 snow stability classification data in China (1980-2020)", "ds_format": "", "ds_source": "
\nThe AVHRR daily cloud-free snow cover area product from 1980 to 2020 is the basic data for the classification of snow cover types, which is developed and produced by the second subject of this project.", "ds_quality": "
\nBased on the AVHRR daily cloud-free snow cover area product data from 1980 to 2020, the data of snow cover days are standardized, quality controlled, analyzed and classified.", "ds_ref_way": "", "ds_abstract": "
\nThis data set is based on 1 China AVHRR daily cloudless 5km snow cover product data set (1980-2020), and introduces continuous snow cover days to complete the classification of snow cover types in China based on stability. The snow cover in China is mainly divided into strong stable snow cover, sub-stable snow cover, periodic unstable snow cover, non-periodic stable unstable snow cover and non-periodic fluctuating unstable snow cover. The data contains a map and a grid file. Adopt fully open sharing.
", "ds_time_res": "", "ds_acq_place": "China", "ds_space_res": "5 km*5 km", "ds_projection": "", "ds_process_way": "\nOn the basis of data source acquisition, define September 1 to August 31 of the next year as a snow year, count the maximum number of consecutive snow days in a snow year as the number of consecutive snow days in the year (CSCD), record the total number of days from the first day to the last day in a snow year as the number of snow days in the year (SD), and record the cumulative number of snow days in a snow year as the number of snow days in the year (SCD), Record the ratio of snow days to snow period as the annual snow fluctuation rate (R);\n
On the basis of counting the number of consecutive snow days and snow periods each year, count the grids with snow records of more than 10 years (including 10 years), and the grids with snow records of less than 10 years are 0, and do not participate in snow classification statistics;\n
On the basis of quality control, count the average continuous snow days, snow period, snow days and snow fluctuation rate of each grid for many years;\n
The classification atlas of snow cover stability types in China from 1980 to 2020 is obtained;\n
Among them, 0.72 and 0.14 are the statistical median of R values of each grid in the range of continuous snow cover for more than 30 days and less than 10 days.", "ds_ref_instruction": "Zhong Xinyue, Hao Xiaohua Northwest Institute of Ecological Environment and Resources, Chinese Academy of Sciences. Classification map of snow cover stability in China (1980-2020). 2020" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "https://creativecommons.org/licenses/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": [ "积雪稳定性" ], "ds_subject_tags": [ "地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "中国陆域" ], "ds_time_tags": [ 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 ], "ds_contributors": [ { "true_name": "钟歆玥", "email": "xyzhong@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": "钟歆玥", "email": "xyzhong@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": "钟歆玥", "email": "xyzhong@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": "积雪" }