A global compendium of human Crimean-Congo haemorrhagic fever virus occurrence

Each of the 2,220 rows represents a single occurrence record (one or more CCHF cases in the same unique location within a single calendar year). The fields contained in the database are as follows: OCCURRENCE_ID: Unique identifier for each occurrence in the database after temporal and locational standardisation.LOCATION_TYPE: Whether the record represents a point or a polygon location.ADMIN_LEVEL: The administrative level which the record represents when the location type is a polygon. Values are 1 (state or province), 2 (district) and -999 when the location type is a point.GAUL_AD1: The first-level GAUL code which identifies the Admin-1 level occurrences as well as the Admin-1 polygon within which any smaller polygons and points lie.GAUL_AD2: The second-level GAUL code which identifies the Admin-2 level occurrences as well as the Admin-2 polygon within which any points lie. Values of -999 are assigned when the polygon was Admin-1 level.UNIQUE_LOCATION: A unique identifier created for all locations (both points and polygons) based upon the unique point locations (in same 5km x 5km pixels) and the GAUL codes.X: The longitudinal coordinate of the point or polygon centroid (WGS1984 Datum).Y: The latitudinal coordinate of the point or polygon centroid (WGS1984 Datum).YEAR: The year of the occurrence. 10. COUNTRY: The name of the country within which the occurrence lies. 11. REGION: The region within which the occurrence lies – values are Asia, Europe, and Africa (includes the Arabian peninsula).

本数据集共包含2220条记录，每条记录对应单次暴发事件：即单个日历年度内，同一唯一地点发生的1例或多例克里米亚-刚果出血热（Crimean-Congo Hemorrhagic Fever，CCHF）病例。

数据库包含的字段如下：
1. OCCURRENCE_ID：经时间与空间标准化处理后，为本数据库中每条暴发事件分配的唯一标识符。
2. LOCATION_TYPE：用于标识记录所代表的空间位置类型，分为点位（point）与面域（polygon）两类。
3. ADMIN_LEVEL：当空间位置类型为面域时，该记录对应的行政层级。其取值包括1（对应州/省级行政单位）、2（对应区级行政单位）；若空间位置类型为点位，则该字段取值为-999。
4. GAUL_AD1：一级GAUL代码，可用于标识行政一级（Admin-1）的暴发事件，同时也可用于界定包含所有次级面域与点位的一级行政面域。
5. GAUL_AD2：二级GAUL代码，可用于标识行政二级（Admin-2）的暴发事件，同时也可用于界定包含所有点位的二级行政面域。若面域为行政一级，则该字段取值为-999。
6. UNIQUE_LOCATION：基于唯一点位坐标（落入相同5km×5km像素格）与GAUL代码生成的唯一标识符，适用于所有空间位置（含点位与面域）。
7. X：点位或面域质心的经度坐标，采用WGS1984大地基准面（WGS1984 Datum）。
8. Y：点位或面域质心的纬度坐标，采用WGS1984大地基准面。
9. YEAR：暴发事件发生的年份。
10. COUNTRY：暴发事件所在的国家名称。
11. REGION：暴发事件所属的大区，取值为亚洲（Asia）、欧洲（Europe）与非洲（含阿拉伯半岛，Africa (includes the Arabian peninsula)）。