Land Resources

Global Terrain Slope and Aspect Data

The data include an elevation map describing median elevation in each grid cell, eight slope maps, and five aspect maps describing distributions (i.e. pixel counts) of the respective slope or aspect classes calculated for 3 arc-sec data and accumulated to 30 arc-sec and 5 min latitude/longitude grid cells respectively. A detailed description including technical details is provided in the documentation file.

The data is saved in RAR archives. More information about the RAR archive format, may be found elsewhere on the net.

Grid cell size: 5 minutes 

LAND MASK

GloLand_5min.rar

Number of 3 arc second grid cells that belong to the land mask and fall into 5 minutes grid cells

ELEVATION

 

GloElev_5min.rar

Median elevation (meters)

 

 

SLOPES (view median slope)

Slope class

GloSlopesCl1_5min.rar

0 % ≤ slope ≤ 0.5 %

GloSlopesCl2_5min.rar

0.5 % ≤ slope ≤ 2 %

GloSlopesCl3_5min.rar

2 % ≤ slope ≤ 5 %

GloSlopesCl4_5min.rar

5 % ≤ slope ≤ 10 %

GloSlopesCl5_5min.rar

10 % ≤ slope ≤ 15 %

GloSlopesCl6_5min.rar

15 % ≤ slope ≤ 30 %

GloSlopesCl7_5min.rar

30 % ≤ slope ≤ 45 %

GloSlopesCl8_5min.rar

Slope > 45 %

 

 

ASPECT (view dominant aspect

Aspect class

GloAspectClN_5min.rar

North: 0˚< aspect ≤45˚ or
315˚< aspect ≤360˚

GloAspectClE_5min.rar

East: 45˚ < aspect ≤ 135˚

GloAspectClS_5min.rar

South: 135˚ < aspect ≤ 225˚

GloAspectClW_5min.rar

West: 225˚ < aspect ≤ 315˚

GloAspectClU_5min.rar

Undefined: Slope aspect undefined; this value is used for grids where slope gradient is undefined or slope gradient is less than 2%.

 

Grid cell size: 30 arc-seconds:

LAND MASK

GloLand_30as.rar

Number of 3 arc second grid cells that belong to the land mask and fall into 30 arcsecond grid cells

 

 

ELEVATION

 

GloElev_30as.rar

Median elevation (meters)

 

 

SLOPES

Slope class

GloSlopesCl1_30as.rar

0 % ≤ slope ≤ 0.5 %

GloSlopesCl2_30as.rar

0.5 % ≤ slope ≤ 2 %

GloSlopesCl3_30as.rar

2 % ≤ slope ≤ 5 %

GloSlopesCl4_30as.rar

% ≤ slope ≤ 10 %

GloSlopesCl5_30as.rar

10 % ≤ slope ≤ 15 %

GloSlopesCl6_30as.rar

15 % ≤ slope ≤ 30 %

GloSlopesCl7_30as.rar

30 % ≤ slope ≤ 45 %

GloSlopesCl8_30as.rar

Slope > 45 %

 

 

ASPECT

Aspect class

GloAspectClN_30as.rar

North: 0˚< aspect ≤45˚ or 315˚< aspect ≤360˚

GloAspectClE_30as.rar

East: 45˚ < aspect ≤ 135˚

GloAspectClS_30as.rar

South: 135˚ < aspect ≤ 225˚

GloAspectClW_30as.rar

West: 225˚ < aspect ≤ 315˚

GloAspectClU_30as.rar

Undefined: Slope aspect undefined; this value is used for grids where slope gradient is undefined or slope gradient is less than 2%.

Data Citation
Fischer, G., F. Nachtergaele, S. Prieler, H.T. van Velthuizen, L. Verelst, D. Wiberg, 2008. Global Agro-ecological Zones Assessment for Agriculture (GAEZ 2008). IIASA, Laxenburg, Austria and FAO, Rome, Italy

Data format Information

Data Format Information