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Metadata 
17.02.2025, MN
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Coordinate reference system: epsg 32740


Soil data 
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downloaded from https://soilgrids.org/
Soil organic carbon stocks in 0-30 cm soil depth.

Transformed to UTM zone ("epsg:32740"), resampled to 30 to fit elevation model, smoothed to reduce pixel artefacts. 

This version of SoilGrids is available to you by ISRIC — World Soil Information under the CC-BY 4.0 License. 

For more information see website. 


Terrain data
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Elevation model originally 1 m resolution

French initiative Litto3D
https://diffusion.shom.fr/multiproduct/product/configure/id/111

Cette licence (CC-BY-SA 4.0) donne la possibilité d’exploiter les données sans versements de redevances, sous réserve d’un « partage à l’identique ».Dès lors que les données sont intégrées dans une œuvre dérivée qui est diffusée, celle-ci doit être partagée  avec cette même licence CC-BY-SA 4.0.


Terrain attributes, derived from digital elevation model resampled to 30 m (reunion_30m.tif).
Brief overview: 

30 m: computed on 30 m pixels (mostly at 90 x 90 m windows)
100 m: computed on 100 m pixels, resampled bilinear (mostly at 100 x 100 m windows)

Algorithms from SAGA GIS, used via R pacakge RSAGA.

 [1] "asp_eness30m.tif" : cos of aspect   
 [2] "asp_nness30m.tif" : sin of aspect   
 [3] "curv100m.tif"     : overall curvature    
 [4] "curv30m.tif"      : overll curvature    
 [5] "curvplan100m.tif" : planar curvature   
 [6] "curvplan30m.tif"  : planar curvature   
 [7] "curvprof100m.tif" : profile curvature   
 [8] "curvprof30m.tif"  : profile curvature   
 [9] "heignor100m.tif"  : normalized height   
[10] "heignor30m.tif"   : normalized height   
[11] "heigslope100m.tif": slope height   
[12] "heigslope30m.tif" : slope height   
[13] "heigstand100m.tif": standardized height    
[14] "heigstand30m.tif" : standardized height   
[15] "heigval100m.tif"  : valley depth   
[16] "heigval30m.tif"   : valley depth   
[17] "mpi100m_150.tif"  : morphometric position index  
[18] "mpi30m_150.tif"   : morphometric position index   
[19] "mrrtf100m.tif"    : multi-resolution ridge top flatness   
[20] "mrrtf30m.tif"     : multi-resolution ridge top flatness   
[21] "mrvbf100m.tif"    : multi-resolution valley bottom flatness   
[22] "mrvbf30m.tif"     : multi-resolution valley bottom flatness  
[23] "reunion_30m.tif"  : elevation model resampled from 1 m   
[24] "slope100m-perc.tif" : slope percent  
[25] "slope30m-perc.tif"  : slope percent  
[26] "tpi_270m.tif"     : topographic positin index 270 m diameter  
[27] "tpi_900m.tif"     : topographic positin index 270 m diameter   
[28] "tri100m.tif"      : terrain ruggedness index   
[29] "tri30m.tif"       : terrain ruggedness index   
[30] "TWIsaga100m_s100.tif": Saga wetness index smoothed 
[31] "TWIsaga100m.tif"  : Saga wetness index   
[32] "TWIsaga30m.tif"   : Saga wetness index   
[33] "vrm100m.tif"      : vector ruggedness measure    
[34] "vrm30m.tif"       : vector ruggedness measure  

