EFG F2.7 Ephem salt lakes – current maps

F2. Lakes biome

This page provides information about the valid indicative distribution map for the ecosystem functional group F2.7 Ephemeral salt lakes. For older or alternative maps, see here.

Methods

Here is the methods summary for Map code and version: F2.7.web.mix v1.0.

Location of ephemeral lakes was taken from global lake databases (Lehner and Döll 2004; types 1 and 3 from Messager et al. 2016), intersected with estimates of ephemeral surface water (classes 9 and 10 from Pekel et al. 2016) and the distribution of arid and semi-arid, endorheic basins (Linke et al. 2019). Occurrences were aggregated to 10 minutes spatial resolution. Occurrences were aggregated to 10 minutes spatial resolution.

Datasets

GLWD-2004 (Lehner and Döll 2004):

Source of validated distribution records. Resolution: ca. 1km2, static. Accuracy evaluation: quantitative (subsets).

GSW-1.1 (Pekel et al. 2016):

Source of Surface water phenology. Resolution: <1km2, periods/epochs. Accuracy evaluation: >90%.

HydroAtlas-1.0 (Linke et al. 2019):

Source of Hydrography. Resolution: <1km2, static. Accuracy evaluation: derived from sources.

HydroLAKES-1.0 (Messager et al. 2016):

Source of Hydrography. Resolution: <1km2, static. Accuracy evaluation: quantitative (subsets).

dataset	url
GLWD-2004	https://www.worldwildlife.org/pages/global-lakes-and-wetlands-database
GSW-1.1	https://global-surface-water.appspot.com/download :: https://developers.google.com/earth-engine/datasets/catalog/JRC_GSW1_1_YearlyHistory
HydroAtlas-1.0	https://www.hydrosheds.org/page/hydroatlas
HydroLAKES-1.0	https://www.hydrosheds.org/page/hydrolakes

Processing

Processing steps used in this map are: Reclassification :: Buffering :: Aggregation.

Map evaluation

This map is considered to be a Fine quality map series based on the following characteristics:

Concept alignment is Semi-direct,general.

Ground observations are NA.

The accuracy evaluation Quantitative accuracy assessment,documented,quantitative.

How to use the data

Available files

Following maps are considered current and valid indicative distribution maps for this ecosystem functional group. Web navigation maps are optimised for use in webapps, but they have similar methods and differ only in details of format and processing.

• Indicative Map (code: F2.7.IM.mix, version v1.0)
• Web navigation (code: F2.7.web.mix, version v1.0)

You can download geospatial data for this map from the following sources:

F2.7.IM.mix (v1.0): Google Cloud bucket :: Zenodo repository (bundle of maps)

F2.7.web.mix (v1.0): GitHub repository :: Google Cloud bucket :: Zenodo repository (bundle of maps) :: Zenodo repository (EFG map) :: GitHub repository :: GitHub repository :: Earth Engine assets

Note that you need to login to some services like mapbox or earthengine, and in some cases you also need to request access to the files.

License information

Indicative maps have been released with a Creative Commons Attribution 4.0 International license.

Datasets used to create this map might have some restriction for commercial use, see details below.

dataset	license_info
GLWD-2004	The data is available for free download for non-commercial scientific :: conservation and educational purposes
GSW-1.1	produced under the Copernicus Programme and is provided free of charge, without restriction of use :: Copernicus Regulation :: http://www.copernicus.eu/main/data-access/
HydroAtlas-1.0	http://creativecommons.org/licenses/by/4.0/ :: Creative Commons Attribution (CC-BY) 4.0 International License
HydroLAKES-1.0	Creative Commons Attribution (CC-BY) 4.0 International License :: http://creativecommons.org/licenses/by/4.0/

References

References used in this version of the maps.

• Pekel JF, Cottam A, Gorelick N, Belward AS (2016) High-resolution mapping of global surface water and its long-term changes Nature 540, 418-422 DOI:10.1038/nature20584
• Messager, M.L., Lehner, B., Grill, G., Nedeva, I., Schmitt, O. (2016) Estimating the volume and age of water stored in global lakes using a geo-statistical approach Nature Communications 13603 DOI:10.1038/ncomms13603
• Lehner, B. and Döll, P. (2004): Development and validation of a global database of lakes, reservoirs and wetlands. Journal of Hydrology 296/1-4: 1-22. Data-set
• Linke, S., Lehner, B., Ouellet Dallaire, C., Ariwi, J., Grill, G., Anand, M., Beames, P., Burchard-Levine, V., Maxwell, S., Moidu, H., Tan, F., Thieme, M. (2019) Global hydro-environmental sub-basin and river reach characteristics at high spatial resolution Scientific Data 6: 283 DOI:10.1038/s41597-019-0300-6