Table 1.

Classification framework of “Production- Living-Ecological Space” in the three northeastern provinces.

First-level Space	Number	Second-level Space	⟪National Remote Sensing Monitoring Land Use/Land Cover Classification System⟫ Secondary Land Type
Production Space	Ⅰ	Agricultural Production Space	11. Field, 12. Dryland
	Ⅱ	Industrial Production Space	53. Other Construction Land
Living Space	Ⅲ	Urban Living Space	51. Town Land
	Ⅳ	Rural Living Space	52. Rural Residential Area
Ecology Space	Ⅴ	Green Ecology Space	21. Forested Land, 22 Shrubbery, 23. Open Forested Land, 24. Other Forested Land 31. High Coverage Grassland, 32. Middle Coverage Grassland, 33. Low Coverage Grassland 61. Sand Land, 62. Saline-alkali Land, 63. Algae Land, 64. Bare Land, 65. Bare Rocky Ground
	Ⅵ	Blue Ecology Space	41. Rrivers and Canals, 42. Lake, 43. Reservoir ponds 44. Permanent Glacier Snow Land, 45. Mudflats, 46 Tidal Land 99. Ocean