Geography Reference
In-Depth Information
110°E1
20°E
130°E
50°N
50°N
40°N
40°N
110°E
120°E
Forest
Woods
Dense grass
Sparse grass
Lakes
Beaches and shores
Bottomlands
Rural settlements
Sandy land
Salina
Bare soil
Other
Paddy lands
Other forest
Shrublands
Streams and rivers
Permanent ice and snow
Moderate grass
Reservoirs and ponds
Other built-up land
Urban built-up land
Swamp land
Gobi
Dry land
Bare rock
Fig. 3.9
The location and 2000 year's land use map of farming-pastoral ecotone in North China
year 2005, which are limitedly applied for a hierarchical classification system of
25 land cover classes. The data team also spent considerable time validating the
precision of the interpretation of TM images and land cover classification by
extensive field surveys (ground validation). The validation result indicated that the
average precision of the interpretation reached 95 %. The 1*1 km land use map of
China is derived from 1:100,000 land use database. It includes two kinds of data,
one was geocoded with the greatest-area method (i.e., if a cell has more than one
possible code or it contains two or more polygons, the code of the polygon with the
