Table 1 Classification system and interpretation signs of Alar reclamation area.

Orchard

Apple fields, jujube fields, grape fields, pear fields, etc.

Black or dark grey, with a relatively regular shape and distinct boundary lines

Cultivated land

Cotton fields, wheat fields, corn fields, sorghum fields, etc.

Dark green, regular in shape, mostly long and strip-shaped, evenly distributed

Forest and grassland

Poplar forests, grasslands, tamarisks, etc.

Black or dark green, mostly in natural form, mostly distributed in large areas in remote regions as well as along rivers and roads

Water body

Rivers and reservoirs

Blue or dark blue, with distinct boundary lines

Construction land

Towns, schools, squares, industrial land, etc.

White or light blue, regular in shape, with distinct boundary lines

Unused land

Wetlands, bare rocks, saline-alkali land, sandy land, etc.

Gray or light brown, irregular in shape, mostly with patchy textures