{"created": "2019-04-01 02:24:45", "updated": "2024-03-29 08:19:35", "id": "ba0e4b6b-8fef-4eec-9c84-81646f266282", "version": 2, "ds_topic": null, "title_cn": "中国1km分辨率数字高程模型数据集", "title_en": "Data set of 1 km resolution DEM in China", "ds_abstract": "
DEM是数字高程模型的英文简称(Digital Ele2vation Model)是流域地形、地物识别的重要原始资料。DEM 的原理是将流域划分为m 行n列的四边形(CELL),计算每个四边形的平均高程,然后以二维矩阵的方式存储高程。由于DEM 数据能够反映一定分辨率的局部地形特征,因此通过DEM 可提取大量的地表形态信息,这些信息包含流域网格单元的坡度、坡向以及单元格之间的关系等。同时根据一定的算法可以确定地表水流路径、河流网络和流域的边界。因此从DEM 提取流域特征,一个良好的流域结构模式是设计算法的前提和关键。
\n\n数据包括:
\n\n1:1KM基础DEM
\n\n根据中国1:25万等高线和高程点形成的数据,包括DEM、山影、坡度、坡向图
\n\n2、SRTM 1km DEM
\n\n切割自全球1KM的SRTM数据,包括DEM、山影、坡度、坡向图
\n\n3、Aster GDEM
\n\n根据30米Aster GDEM,拼接、切割、重采样成1KM
\n\n文件格式都为:geotiff
\n\n数据集投影:
\n\nProjection = Albers Conical Equal Area\",
\n\nGEOGCS[\"Krasovsky\",
\n\nDATUM[\"Krasovsky\", SPHEROID[\"Krasovsky\",6378245,298.3000003760163]],
\n\nPRIMEM[\"Greenwich\",0],
\n\nUNIT[\"degree\",0.0174532925199433]],
\n\nPROJECTION[\"Albers_Conic_Equal_Area\"],
\n\nPARAMETER[\"standard_parallel_1\",25],
\n\nPARAMETER[\"standard_parallel_2\",47],
\n\nPARAMETER[\"latitude_of_center\",0],
\n\nPARAMETER[\"longitude_of_center\",105],
\n\nPARAMETER[\"false_easting\",0],
\n\nPARAMETER[\"false_northing\",0],
\n\nUNIT[\"metre\",1,]
", "ds_source": "中国1:25万等高线和高程点、全球1KM的SRTM数据、30米Aster GDEM。
", "ds_process_way": "拼接、切割、重采样
", "ds_quality": "数据集通过严格的人工审核控制质量
", "ds_acq_start_time": null, "ds_acq_end_time": null, "ds_acq_place": "中国", "ds_acq_lon_east": 135.5, "ds_acq_lat_south": 17.8, "ds_acq_lon_west": 73.2, "ds_acq_lat_north": 53.8666666666667, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "在线下载", "ds_total_size": 19977150, "ds_files_count": 1, "ds_format": "GeoTIFF", "ds_space_res": "1000.0m", "ds_time_res": "", "ds_coordinate": "WGS84", "ds_projection": "Albers", "ds_thumbnail": "ba0e4b6b-8fef-4eec-9c84-81646f266282.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": "李红星", "ds_serv_phone": "0931-4967287", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": ["170.4510"], "quality_level": 3, "publish_time": "2020-12-30 11:23:03", "last_updated": "2023-08-23 16:11:39", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.Westdc.2020.393", "license": null, "ds_topic_tags": ["DEM"], "ds_subject_tags": ["自然地理学"], "ds_class_tags": [], "ds_locus_tags": ["中国", "中国区域,"], "ds_time_tags": [], "ds_contributors": ["吴立宗"], "ds_meta_authors": ["吴立宗"], "ds_managers": ["敏玉芳"], "category": "基础地理"}