Information SDG 15.4.2. Mountain Descriptor Map
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SDG1542_Mntn_BioclimaticBelts.tif has been created by reclassifying the geotiff file 'GMBA_2016_Bioclimatic_Belts_WorldClim_2.5m_V1.1.tif' created by the Global Mountain Biodiversity Assessment (https://ilias.unibe.ch/goto_ilias3_unibe_cat_1000514.html) Version 1.2.  
originally composed by the 7 bioclimatic layers as defined by Körner et al. (2011) into 4 classes, as indicated below:

1: nival (growing season < 10 days; season mean temperature < 3.5 degrees C) ==> 1 Nival
2: upper alpine zone (growing season between 10 and 54 days; season mean temperature < 3.5 degrees C) ==> 2 Alpine
3: lower alpine zone (growing season < 94 days or season mean temperature < 6.4 degrees C) ==> 2 Alpine
4: upper montane zone (growing season >= 94 days and season mean temperature between 6.4 and 10.0 degrees C) ==> 3 Montane
5: lower montane zone (growing season >= 94 days and season mean temperature between 10.0 and 15.0 degrees C) ==> 3 Montane
6: warm zone with possible freezing (growing season >= 94 days and season mean temperature > 15.0 degrees C) ==> 4 Remaining mountain area
7: zone with perpetual warm conditions, no freezing (growing season >= 94 days and season mean temperature > 15.0 degrees C) ==> 4 Remaining mountain area

The result of this classification was masked to a binary layer where the value 1 represents mountainous areas as defined by Kapos et al. 2002, and 0 represents non-mountainous areas created by Ravilious et al. (2021) using the Global Multi-resolution Terrain Elevation Data (GMTED 2010) at 7.5 arc-seconds spatial resolution (approximately 230 m). 
(https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-elevation-global-multi-resolution-terrain-elevation)

Technical notes: 
Spatial projection: EPSG:4326 - WGS 84
Grid cell size: 0.0083273 decimal degrees

References

Körner C, Paulsen J. and Spehn E (2011) A definition of mountains and their bioclimatic belts for global comparisons of biodiversity data. Alpine Botany 121(2): 73-78 DOI:10.1007/s00035-011-0094-4. 

Ravilious, C.,  Tshwene-Mauchaza, B. and Kapos, V. (2021). Validation and implementation of the Kapos Mountain Classification: Assessing the impact of DEM resolution on the mapping of mountain classes following the Kapos methodology . UNEP-WCMC, Cambridge.