Hydrological < p > China's 1:100000 land use data is a remote sensing scientific and technological team of 19 research institutes affiliated to the Chinese Academy of Sciences organized in the "Eighth Five Year Plan" major application project of the Chinese Academy of Sciences, macro survey and dynamic research on remote sensing of resources and environment, which is based on Landsat in three years by means of satellite remote sensing MSS, TM and ETM Remote sensing data set up a 1:100000 land use image and vector database in China. The main contents include: 1:100000 land use data in China; 1:100000 land use graphic data and attribute data in China.

This data is directly cut from the 1:100000 land use data of China. The 1:100000 land use data of Heihe River Basin adopts a hierarchical land cover classification system, which divides the whole basin into six first-class categories (cultivated land, forest land, grassland, water area, urban and rural areas, industrial and mining land, residential land and unused land), and 26 second-class categories; the data type is vector polygon, which is stored in shape format; there are two types of data projection: WGS84 / Albers; the data coverage is new Heihe River basin boundary (lack of data from Outer Mongolia).

Land use classification attributes:

Level 1 type level 2 type attribute code spatial distribution location

Farmland paddy field 113 is mainly distributed in river alluvial plain, basin, river valley and Sichuan

Cultivated land and paddy field 112 are distributed on narrow valley platform or beach in hilly Valley (with irrigation conditions)

Farmland paddy field 111 is mainly distributed on narrow valley platform or beach in mountain valley (with better irrigation conditions)

Cultivated land and dry land 124 are mainly distributed in mountainous areas, and the slope is generally greater than 25 degrees (belonging to steep slope hanging land), so it should be returned to forest.

Cultivated land 123 is mainly distributed in basin, piedmont, river alluvial, proluvial or lacustrine plain (water shortage and poor irrigation conditions).

The cultivated dry land 122 is mainly distributed in the hilly areas (Shaanxi, Gansu, Ningxia and Qinghai). In general, the land is distributed on the gentle slope of the hills, as well as on the long and long slopes.

Cultivated land and dry land 121 are mainly distributed in mountainous areas, hillsides (gentle slope, hillside, steep slope platform, etc.) and piedmont belt with an altitude of less than 4000 meters.

Woodland forest land (Arbor) 21 is mainly distributed in high mountains (below 4000 meters above sea level) or middle mountain slopes, valley slopes, mountain tops, plains, etc. It is found in the Nanshan and Qilian Mountains of Qinghai.

Woodland shrub land 22 is mainly distributed in the higher mountain area (below 4500m), most of which are hillside, valley and sandy land.

Woodland 23 is mainly distributed in mountainous area, hilly area, plain, sandy land and Gobi (Loamy and sandy conglomerate) edge.

Other forest lands 24 are mainly distributed around the oasis ridge, riverside, roadside and rural residential areas.

The grassland 31 with high coverage is generally distributed in mountainous area (gentle slope), hilly area (steep slope), river beach, Gobi, sand dune, etc.

Grassland 32 is mainly distributed in dry areas (low-lying land next door and land between Sandy Hills).

The low cover grassland 33 mainly grows in the dry area (on the loess hills and on the edge of sandy land).

Water channel 41 is mainly distributed in plain, inter Sichuan cultivated land and inter mountain valley.

Water lakes 42 are mainly distributed in low-lying areas.

Water reservoir pond 43 is mainly distributed in the mountain lowlands and Sandy Hills lowlands of Qinghai Province.

Glaciers and permanent snow cover 44 are mainly distributed in plain and valley between rivers, surrounded by residential land and cultivated land.

The flood land 46 is mainly distributed on the top of (over 4000) mountains.