本数据主要反映的是2000年前后新疆土地利用现状，依据《国家资源环境信息系统数据库构建》——新疆片区土地利用TM卫星影像解译标志建立的《中国科学院土地利用分类系统》，把全疆土地分为6个一级类，24个二级类；共有超过10万个图斑，所有土地分类要素均在一个图层内（xj2000td）。
", "ds_source": "数据来源于从马里兰大学网站上下载的2000年代前后新疆全疆范围的Landsate TM、ETM影像数据和中科院新疆分院文献中心馆藏的中国70年代出版的1:10万地形图。
", "ds_process_way": "对TM数据先进行筛选，选出云覆盖比例少于4%，或是较少遮盖主要地物的，结合1:10万地形图对选出的影像进行几何精纠正、然后拼接、匀色，最后成为可矢量化的产品，由专业人员按照解译标志和分类系统对每一景TM数据进行目视解译、手工矢量化，生成COVERAGE格式数据，再利用Arcgis软件把COVERAGE转换成SHP数据，经过投影转换生成本数据。
", "ds_quality": "本数据由中国科学院新疆生态与地理研究所地理信息与制图专业人员负责数据加工，从纸质资料的扫描、影像数据的筛选、几何精纠正、拼接、匀色到数字矢量化、人工解译，整个作业流程均遵守国家相关标准，数字化误差控制在2个像素以内，保证了矢量化的界线与地形图的界线完全吻合，矢量数据真实反映地物形态和属性信息，数据精确度高达99%。
", "ds_acq_start_time": "2000-01-01 00:00:00", "ds_acq_end_time": "2000-12-31 00:00:00", "ds_acq_place": "新疆维吾尔自治区", "ds_acq_lon_east": 108.0, "ds_acq_lat_south": 27.0, "ds_acq_lon_west": 73.0, "ds_acq_lat_north": 49.0, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 87645006, "ds_files_count": 4, "ds_format": "矢量", "ds_space_res": null, "ds_time_res": "年", "ds_coordinate": "WGS84", "ds_projection": "Albers椭球体正轴等面积双标准纬线割圆锥投影", "ds_thumbnail": "5f750804-bad7-44d7-8ecd-8441bc138b2e.jpg", "ds_thumb_from": 0, "ds_ref_way": "吴世新，2000年新疆1:25万土地利用数据，中科院新疆生态与地理研究所，2016", "paper_ref_way": "", "ds_ref_instruction": null, "ds_from_station": null, "organization_id": "52b7b79b-860c-49a5-9083-9a70cf8bed5a", "ds_serv_man": "李锦", "ds_serv_phone": "09917827369", "ds_serv_mail": "lijin@ms.xjb.ac.cn", "doi_value": "", "subject_codes": null, "quality_level": 3, "publish_time": "2021-01-05 16:20:38", "last_updated": "2023-08-23 17:02:29", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1311", "license": null, "i18n": { "en": { "title": "1:250000 land use data products in Xinjiang in 2000", "ds_format": "", "ds_source": "The data comes from Landsat TM and ETM image data downloaded from the website of the University of Maryland around the 2000s in Xinjiang and 1:100000 topographic map published in the 1970s in the collection of the Xinjiang branch of the Chinese Academy of Sciences.
", "ds_quality": "This data is processed by the geographic information and cartography professionals of Xinjiang Institute of ecology and geography, Chinese Academy of Sciences. From the scanning of paper data, screening of image data, precise geometric correction, splicing, color equalization to digital vectorization and manual interpretation, the whole operation process complies with the relevant national standards, and the digital error is controlled within 2 pixels, ensuring the vectorization boundary The boundary between the line and the topographic map is exactly the same. The vector data truly reflects the shape and attribute information of the features, and the accuracy of the data is as high as 99%.
", "ds_ref_way": "Wu Shixin, 1:250000 land use data of Xinjiang in 2000, Xinjiang Institute of ecology and geography, Chinese Academy of Sciences, 2016
", "ds_abstract": "This data mainly reflects the current situation of land use in Xinjiang around 2000. According to the construction of national resource and environment information system database, the land use classification system of Chinese Academy of Sciences established by TM satellite image interpretation mark of land use in Xinjiang area, the land in Xinjiang is divided into 6 first-class and 24 second-class categories, with more than 100000 map spots and all land classification elements All in one layer (xj2000td).
", "ds_time_res": "年", "ds_acq_place": "Xinjiang Uygur Autonomous Region", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Firstly, the TM data is screened, and the cloud coverage ratio is less than 4%, or the main ground objects are less covered. Combined with 1:100000 topographic map, the selected image is geometrically corrected, then spliced, and leveled. Finally, it becomes a vectorized product, and each TM data is visually interpreted and manually vectorized by professionals according to the interpretation mark and classification system to generate a coverage grid Then, ArcGIS software is used to convert coverage data into SHP data, and cost data is generated through projection conversion.
", "ds_ref_instruction": " \nIn order to respect intellectual property rights, protect the rights and interests of data authors, expand the services of data centers, and evaluate the application potential of data, data users are requested to clearly indicate the data source and data authors in the research results (including published papers, works, data products and unpublished research reports, data products, etc.) produced by using data. For data reprinted (secondary or multiple releases), the author must also indicate the source of the original data." } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "ds_topic_tags": [ "土地利用", "LUCC", "土地覆被" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "新疆维吾尔自治区" ], "ds_time_tags": [ 2000 ], "ds_contributors": [ { "true_name": "吴世新", "email": "wsx@ms.xjb.ac.cn", "work_for": "中科院新疆生态与地理研究所", "country": "" } ], "ds_meta_authors": [ { "true_name": "李锦", "email": "lijin@ms.xjb.ac.cn", "work_for": "新疆生态与地理研究所", "country": "中国" } ], "ds_managers": [ { "true_name": "李锦", "email": "lijin@ms.xjb.ac.cn", "work_for": "新疆生态与地理研究所", "country": "中国" }, { "true_name": "吴世新", "email": "wsx@ms.xjb.ac.cn", "work_for": "中科院新疆生态与地理研究所", "country": "" } ], "category": "基础地理" }