Tropical and Subtropical Wetlands Distribution

Version 7.1

Gumbricht, T.; Román-Cuesta, R.M.; Verchot, L.V.; Herold, M.; Wittmann, F; Householder, E.; Herold, N.; Murdiyarso, D., 2017, "Tropical and Subtropical Wetlands Distribution", https://doi.org/10.17528/CIFOR/DATA.00058, Center for International Forestry Research (CIFOR), V7, UNF:6:Bc9aFtBpam27aFOCMgW71Q== [fileUNF]

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Description	Wetlands are important providers of ecosystem services and key regulators of climate change. They positively contribute to global warming through their greenhouse gas emissions, and negatively through the accumulation of organic material in histosols, particularly in peatlands. Our understanding of wetlands’ services is currently constrained by limited knowledge on their distribution, extent, volume, inter-annual flood variability, and disturbance levels. We present an expert system approach to estimate wetland and peatland areas, depths and volumes, which relies on three biophysical indices related to wetland and peat formation: 1. Long-term water supply exceeding atmospheric water demand; 2. Annually or seasonally water-logged soils; 3. A geomorphological position where water is supplied and retained. The dataset is version 2 with significant improvements compare to previous version. It shows distribution of wetland, peatland and peat depth that covers the tropics and sub tropics (40° N to 60° S; 180° E to -180° W), excluding small islands. It was mapped in 231 meters spatial resolution. The dataset can be viewed in this interactive map: http://www.cifor.org/global-wetlands/. (2017)
Keyword	peatlands, peat, wetlands
Subject	Climate Change, Energy and low carbon development (CCE)
Related Publication	Gumbricht, T., Román-Cuesta, R.M., Verchot, L.V., Herold, M., Wittmann, F., Householder, E., Herold, N., Murdiyarso, D.. 2017. An expert system model for mapping tropical wetlands and peatlands reveals South America as the largest contributor. Global Change Biology 23(9):3581-3599 doi: http://www.cifor.org/pid/6419
Alternative URL	http://www.cifor.org/global-wetlands/

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	1 to 5 of 5 Files	Original Format Archival Format (.tab)
	DataDocumentation.tab Tabular Data - 0 B - Mar 12, 2019 - 1,428 Downloads 4 Variables, 25 Observations - UNF:6:Bc9aFtBpam27aFOCMgW71Q== Attributes included	TwoRavens Stats Data Explorer Original File Format (MS Excel Spreadsheet) Tab-Delimited RData Format Variable Metadata Data File Citation RIS EndNote XML BibTeX
	TROP-SUBTROP_PeatV21_2016_CIFOR.7z 7Z Archive - 38.6 MB - Dec 18, 2017 - 2,341 Downloads MD5: f8a2b87b10b903ce20b3c785dd529326 Distribution of peatland that covers the tropics and sub tropics, excluding small islands. It was mapped in 231 meters spatial resolution. Peat is here defined as any soil having at least 30cm of decomposed or semi-decomposed organic material with at least 50% of organic matter. This corresponds to 29% of carbon content using 1.72 as the transformation factor. The peatland map is produced by adding the peat forming wetlands: mangrove (20), swamp/bog (30), Fen (40), riverine (50), and floodswamps (60) (note: the number in parentheses refer to pixel code of each class in Wetlands dataset). Our map of peatlands was contrasted against n=275 geo-positioned soil profiles containing peat, with 65% of agreement. Further fieldwork is however needed to validate our map. Mangroves are here considered to host the thresholds of depth and organic matter content needed for peat definition, although mineral soil may prevail. Mangroves contribute with ca. 180,000 km2 to the 1.7 million km2 of peatlands (11%), which would need further ground validation (i.e. in areas like Indonesian Papua have large extents of mangrove that contribute to peat, which would need ground-truthing to validate if they contain peat as defined here).	Download
	TROP-SUBTROP_WetlandV3b_2016_CIFOR.7z 7Z Archive - 133.8 MB - Apr 18, 2022 - 1,215 Downloads MD5: 98c9a222cb34ee6dde7ae0eefa0d9800 VERSION 3: The geographical distribution of wetlands in tropical and subtropical areas, excluding small islands, has been mapped with a spatial resolution of 231 meters. The mapping was accomplished by combining a hydrological model with an annual time series of satellite-derived estimations of soil moisture. This integrated methodology encompasses the dynamics of water movement and the extent of surface wetness, which are then combined with geomorphological data to offer an extensive representation of wetland ecosystems.The new version of the Global Tropical and Subtropical Wetlands Map was improved by generalization analysis such as Majority filter and Boundary Clean tools. The generalization analysis tools are used to clean up small erroneous data (eliminate isolated pixels) in the raster. The edges are smoothed by expanding and shrinking boundaries or by growing or shrinking zones based on the values within the neighborhood pixels. Moreover, an ArcGIS layer file was generated for facilitating the visualization. Contact: Dr. Arimatéa C. Ximenes / Email: a.ximenes@cifor-icraf.org	Download
	Tropical and Subtropical Peatdepth.7z Unknown - 0 B - Apr 17, 2017 - 1,661 Downloads MD5: ebe15f2cc2026760f966adb0fe4970a0 Distribution and depth of peat in meter that covers the tropics and sub tropics, excluding small islands. It was mapped in 231 meters spatial resolution. Warning: A validation of our depth map against ground measured peat depths (i.e. soil profiles) suggests that our deepest values (>10m) overestimate depth. For this reason, all depths >10m have been thresholded to 10m.	Download
	Tropical and Subtropical Wetlands.7z Unknown - 256.0 MB - Apr 17, 2017 - 3,476 Downloads MD5: dc5f038229219054b59fa34887a08e00 Distribution of wetland that covers the tropics and sub tropics, excluding small islands. It was mapped in 231 meters spatial resolution by combining a hydrological model and annual time series of satellite-derived estimates of soil moisture to represent water flow and surface wetness that are then combined with geomorphological data.	Download

Citation Metadata

Dataset Persistent ID	doi:10.17528/CIFOR/DATA.00058
Publication Date	2017-04-17
Title	Tropical and Subtropical Wetlands Distribution
Alternative URL	http://www.cifor.org/global-wetlands/
Author	Gumbricht, T. (Center for International Forestry Research (CIFOR)) Román-Cuesta, R.M. (Wageningen University & Research) Verchot, L.V. (International Center for Tropical Agriculture) - ORCID: https://orcid.org/0000-0001-8309-6754 Herold, M. (Wageningen University & Research) Wittmann, F (Columbia University) Householder, E. (Columbia University) Herold, N. (Wageningen University & Research) Murdiyarso, D. (Center for International Forestry Research (CIFOR)) - ORCID: https://orcid.org/0000-0001-5497-6293
Contact	Use email button above to contact. CIFOR-RDM (Center for International Forestry Research (CIFOR)) Román-Cuesta, R.M. (Laboratory of Geo-Information Science and Remote Sensing. Wageningen University & Research, Wageningen, The Netherlands)
Description	Wetlands are important providers of ecosystem services and key regulators of climate change. They positively contribute to global warming through their greenhouse gas emissions, and negatively through the accumulation of organic material in histosols, particularly in peatlands. Our understanding of wetlands’ services is currently constrained by limited knowledge on their distribution, extent, volume, inter-annual flood variability, and disturbance levels. We present an expert system approach to estimate wetland and peatland areas, depths and volumes, which relies on three biophysical indices related to wetland and peat formation: 1. Long-term water supply exceeding atmospheric water demand; 2. Annually or seasonally water-logged soils; 3. A geomorphological position where water is supplied and retained. The dataset is version 2 with significant improvements compare to previous version. It shows distribution of wetland, peatland and peat depth that covers the tropics and sub tropics (40° N to 60° S; 180° E to -180° W), excluding small islands. It was mapped in 231 meters spatial resolution. The dataset can be viewed in this interactive map: http://www.cifor.org/global-wetlands/. (2017)
Subject	Climate Change, Energy and low carbon development (CCE)
Keyword	peatlands (GACS) http://id.agrisemantics.org/gacs/C10734 peat (GACS) http://id.agrisemantics.org/gacs/C4772 wetlands (GACS) http://id.agrisemantics.org/gacs/C2282
Topic Classification	Climate change Forest Management
Related Publication	Gumbricht, T., Román-Cuesta, R.M., Verchot, L.V., Herold, M., Wittmann, F., Householder, E., Herold, N., Murdiyarso, D.. 2017. An expert system model for mapping tropical wetlands and peatlands reveals South America as the largest contributor. Global Change Biology 23(9):3581-3599 doi: http://www.cifor.org/pid/6419 http://dx.doi.org/10.1111/gcb.13689 CIFOR. 2017. Global Wetlands Map: Help us map the world's wetlands. Bogor, Indonesia: Center for International Forestry Research (CIFOR). doi: http://www.cifor.org/pid/6412 http://dx.doi.org/10.17528/cifor/006412 Murdiyarso, D., Román-Cuesta, R.M., Verchot, L.V., Herold, M., Gumbricht, T., Herold, N., Martius, C.. 2017. New map reveals more peat in the tropics. doi: http://www.cifor.org/pid/6452 http://dx.doi.org/10.17528/cifor/006452 Croft-Cusworth, C.. 2016-09-27. A map of the world’s wetlands. url: http://blog.cifor.org/43294/a-map-of-the-worlds-wetlands?fnl=en.
Language	English
Grant Information	United States Agency for International Development (USAID)
Distributor	Center for International Forestry Research (CIFOR) http://www.cifor.org
Distribution Date	2017-03-15
Depositor	Salim, Mohammad Agus
Deposit Date	2017-04-07
Time Period Covered	Start: 2011
Kind of Data	spatial data
Software	ArcGIS QGIS ER Mapper Erdas Imagine ENVI GRASS GIS
Other References	https://www.cifor.org/global-wetlands/

Overview of the research

Project Information	Sustainable Wetlands Adaptation and Mitigation Program (SWAMP) (PMO-00047) Sustainable Wetlands Adaptation and Mitigation Program (SWAMP): Phase 2 (PMO-1305)
Research Program	CGIAR Research Program on Forests, Trees and Agroforestry (ForestsTreesAgroforestry)
CRP Flagship	Flagship 5: Forests, trees and agroforestry for climate change adaptation and mitigation
Program Priority	Blue carbon and peatlands; Climate change adaptation

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