ASTER GDEM 30米分辨率高程数据来源于NASA，ASTER GDEM数据采用UTM/WGS84投影，数据格式为img栅格影像，数据的值域范围为-300-7445米之间，其垂直精度20米，水平精度30米。本数据为2000年中亚五国区域东经45°-108°，北纬32°-56°范围的DEM数据。
", "ds_source": "SRTM（ShuttleRadarTopographyMission）30米分辨率高程数据由美国太空总署（NASA）和国防部国家测绘局（NIMA）联合测量。SRTM系统获取的雷达影像的数据量约为9.8万亿字节，经过两年多的数据处理，制成了数字地形高程模型（DEM），即现在的SRTM3地形产品数据。
", "ds_process_way": "预处理：利用Arcmap10.2软件打开DEM高程数据，经过栅格计算和再分类计算得到正常海拔值（-227-7050米）的DEM数据，经由中亚五国边界裁剪，得到该数据。\nDEM渲染图处理：由预处理后的DEM数据分别生成山体阴影数据（Zfactor=5），山体阴影数据与DEM数据叠加生成DEM渲染图。该渲染图可由用户根据自身需要再加工处理。
", "ds_quality": "本数据集利用ASTER GDEM第一版本（V1）的数据进行加工得来，是全球空间分辨率为30米的数字高程数据产品。由于云覆盖，边界堆叠产生的直线，坑，隆起，大坝或其他异常等的影响，ASTER GDEM第一版本原始数据局部地区存在异常，所以由ASTER GDEMV1加工的数字高程数据产品存在个别区域的数据异常现象，可以和全球90米分辨率数字高程数据产品互相补充使用。
", "ds_acq_start_time": null, "ds_acq_end_time": null, "ds_acq_place": "", "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": "login-access", "ds_total_size": 2913106564, "ds_files_count": 1, "ds_format": "", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "fd01b9fd-c7d1-447c-adef-79fac600ff42.jpg", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "a5877b42-96ea-4f13-af7e-246f355413d6", "doi_value": "", "subject_codes": [ "170.40" ], "quality_level": 1, "publish_time": "2025-05-09 20:36:46", "first_publish_time": null, "last_updated": "2025-05-27 19:30:42", "protected": false, "protected_to": null, "lang": "zh", "cstr": "33110.11.ariddc.00550", "license": null, "extra": null, "files_shape": [ { "name": "cadem30m_ASTER.rar", "size": 2913106564, "is_dir": false } ], "features": null, "data_level": 0, "i18n": { "en": { "title": "30mDEM data of five Central Asian countries in 2000", "ds_abstract": "ASTER GDEM 30-meter resolution elevation data comes from NASA. ASTER GDEM data uses UTM/WGS84 projection, and the data format is img grid image. The data range ranges from-300 to 7445 meters, with a vertical accuracy of 20 meters and a horizontal accuracy of 30 meters. This data is DEM data ranging from 45° to 108 ° east longitude and 32° to 56 ° north latitude in the five Central Asian countries in 2000.
", "ds_source": "SRTM (Shuttle Radar Topography Mission) 30-meter resolution elevation data is jointly measured by NASA and the Department of Defense's National Bureau of Surveying and Mapping (NIMA). The data volume of radar images acquired by the SRTM system is about 9.8 trillion bytes. After more than two years of data processing, a digital terrain elevation model (DEM), which is now SRTM3 terrain product data, has been produced.
", "ds_process_way": "Preprocessing: Use Arcmap10.2 software to open DEM elevation data, and get DEM data with normal altitude values (-227 - 7050 meters) through grid calculation and reclassification calculation. The data is obtained through clipping the borders of the five Central Asian countries.\nDEM rendering processing: Hillshade data (Zfactor=5) is generated from the pretreated DEM data, and the Hillshade data and DEM data are superimposed to generate DEM rendering. The rendering can be reprocessed by the user according to his or her needs.
", "ds_quality": "This dataset is processed using data from ASTER GDEM Version 1 (V1) and is a digital elevation data product with a global spatial resolution of 30 meters. Due to the influence of straight lines, pits, elevations, dams or other anomalies caused by cloud coverage and boundary stacking, local areas of the original data of the first version of ASTER GDEM have abnormalities. Therefore, the digital elevation data products processed by ASTER GDEMV1 have data anomalies in individual areas, which can be used in conjunction with global 90-meter resolution digital elevation data products.
" } }, "license_type": null, "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": [ "数字高程", "DEM", "数字高程模型" ], "ds_subject_tags": [ "地图学" ], "ds_class_tags": [], "ds_locus_tags": [ "土库曼斯坦", "塔吉克斯坦", "吉尔吉斯斯坦", "乌兹别克斯坦", "哈萨克斯坦" ], "ds_time_tags": [ 2000 ], "ds_contributors": [ "方晖" ], "ds_meta_authors": [ "方晖" ], "ds_managers": [ "李锦" ], "category": "DEM数字高程" }