# Analysis and Applications of GlobeLand30: A Review
## 2 GlobeLand30 and Accuracy Analysis  
### Data Product  
GlobeLand30 is an open-access 30 m resolution global land cover data product that was developed by the National Geomatics Center of China [25]. It comprises ten land cover types, including water bodies, wetlands, artificial surfaces, cultivated lands, forests, shrublands, grasslands, and barren lands (Figure 1), for the years 2000 and 2010. The codes and definition of the ten classes are listed in Table 1. They were extracted from more than 20,000 Landsat and Chinese HJ-1 satellite images with a pixel-object-knowledge (POK)-based operational mapping approach, and an overall classification accuracy of over 80% was achieved [24; 26]. On 22 September, China donated GlobeLand30 to the United Nations (UN) as a contribution towards global sustainable development and combating climate change [27]. The GlobeLand30_2010 products were registered at DOI system as DOI:10.11769/GlobeLand30_2010.db, as well as the Global Land Surface Water and Artificial Surface Covers registered as DOI:10.3974/db.2014.02.01 and DOI:10.3974/db.2014.02.02, respectively.  
GlobeLand30 data adopts raster data format for storage, with the non-destructive GeoTIFF compression format and the 256-color 8-bit indexed pattern. The WGS84 coordinate system, UTM projection and six-degree zoning are adopted. GlobeLand30 is organized into data tiles following two different latitude situations, that is, a size of 5\({}^{\circ}\) (latitude) \(\times\) 6\({}^{\circ}\) (longitude) within the area of 60\({}^{\circ}\) N and 60\({}^{\circ}\) S, and a size of 5\({}^{\circ}\) (latitude) \(\times\) 12\({}^{\circ}\) (longitude) within the area of 60\({}^{\circ}\) to 80\({}^{\circ}\) degrees north and south of the equator. A total of 853 data tiles cover the world in total, as shown in Figure 2.  
\begin{table}
\begin{tabular}{c c c} \hline
**Code** & **Type** & **Definition** \\ \hline
10 & Cultivated land & Land used for agriculture, horticulture and gardens, including paddy fields, irrigated and dry farmland, vegetable and fruit gardens, etc. \\ \hline
20 & Forest & Land covered by trees, vegetation covers over 30\%, including deciduous andiferous forests, and sparse woodland with cover 10–30\%, etc. \\ \hline
30 & Grassland & Land covered by natural grass with cover over 10\%, etc. \\ \hline
40 & Shrub land & Land covered by shrubs with cover over 30\%, including deciduous and evergreen shrubs, and desert steppe with cover over 10\%, etc. \\ \hline
50 & Wetland & Land covered by wetland plants and water bodies, including inland marsh, lake marsh, river floodplain wetland, forest/shrub wetland, peat bogs, mangrove and salt marsh, etc. \\ \hline
60 & Water bodies & Water bodies in land area, including river, lake, reservoir, fish pond, etc. \\ \hline
70 & Tundra & Land covered by lichen, moss, hardy perennial herb and shrubs in the polar regions, including shrub tundra, herbaceous tundra, wet tundra, and barren tundra, etc. \\ \hline
80 & Artificial Surfaces & Land modified by human activities, including all kinds of habitation, industrial and mining area, transportation facilities, and interior urban green zones and water bodies, etc. \\ \hline
90 & Bare land & Land with vegetation cover lower than 10\%, including desert, sandy fields, Gobi, bare rocks, saline and alkaline land, etc. \\ \hline
100 & Permanent snow & Lands covered by permanent snow, glacier and icecap. \\ \hline \end{tabular}
\end{table}
Table 1: Classification, codes, and definition of each land cover type of GlobeLand30.  
Figure 1: Map of GlobeLand30 (2010).