page under construction ------------------------------
take information for EFAS from the following pages: EFAS static data & Static data files
what to add? e.g. Upstream area, Flood thresholds, etc....
In order to interpret CEMS-Flood (EFAS & GloFAS) output model outputs in a correct way, you will need various a number of auxiliary data, also referred to as the 'statictime invariant' data on the Climate Data Store (CDS). These data are part of the EFAS and GloFAS setups of the LISFLOOD model.
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This page summarises the auxiliary datasets made available through the CDS and how they should be used in combination with the model outputs.
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EFAS Auxiliary Data
The auxiliary data are provided as small NetCDF files, and are available to download through the Climate Data Store (CDS) on the EFAS pages.
The following five datasets are available:
- Upstream area
- Elevation
- Soil depth (3 soil levels)
- Wilting point (3 soil levels)
- Field capacity (3 soil levels)
For version 4.0 and older they are in the INSPIRE compliant ETRS89 Lambert Azimuthal Equal Area Coordinate Reference System (ETRS-LAEA), also referred to as EPSG:3035. More information on the EFAS horizontal resolution is available in the model output page.
For version 5.0, they are in WGS84.
The Local Drain Direction (LDD) file is also available to download below (in both EPSG:3035 for versions 4.0 and older, and WGS84 for v5.0).
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It is important for users to make sure they download the auxiliary data consistent with the dataset version of interest. This is because the auxiliary data sometimes change with a new EFAS cycle; for example, the upstream area is specific to the hydrological model configuration used which can change between cycles. To provide an example, users accessing forecast data issued between 2019-05-13 and 2020-03-04 should use v3.0 of the auxiliary data, as forecasts issued during that period were produced with EFAS v3.0. All the version dates are shown in the table below:
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EFAS Auxiliary Data
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title | EFAS upstream area |
These files denote the total upstream area for each river pixel, expressed in m2. This is defined as the catchment area for each river segment, meaning the total area that contributes with water to the river at the specific grid point. The upstream area always includes the area of the pixel. The upstream area is provided in the netCDF file if you retrieve the data from CDS and choose the format netCDF. You can also download the upstream area file as netCDF below:
Version 2.0 Released 2018-10-10 12 UTC
Version 3.0 Released 2019-05-13 12 UTC
The river network changed slightly for EFAS version 3.5, therefore there is a new upstreams area file.
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This file denotes the mean elevation for each pixel in the EFAS domain, expressed in m above sea level. The file can be downloaded as NetCDF here. |
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The auxiliary/static files you need to calculate soil moisture index are here. | |||||||||
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The upstream area file denotes the total upstream area for each river pixel, expressed in m2. It is defined as the catchment area for each river segment, i.e. the total area that contributes with water to the river at the specific grid point (or river pixel). The upstream area always includes the area of the pixel it is associated to.
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The elevation (sometimes referred to as orography) file denotes the mean elevation for each pixel in the EFAS domain, expressed in m above sea level. It is defined for each grid point of the modelled domain.
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The files for soil depth, wilting capacity, and field capacity are collectively known as the 'soil wetness index' files, and contain all the relevant information to calculate the soil wetness index from the volumetric soil moisture dataset model output. They are provided separately for each of the three soil layers represented in LISFLOOD. They are defined as follows:
More detail on the datasets and how they should be used to derive the soil moisture index is provided here.
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The Local Drain Direction (LDD) in a hydrological model is the essential component to connect the grid cells in order to express the flow direction from one cell to another, and forming a river network from the springs to the mouth. LDD represents flow directions from each grid-cell to its steepest down-slope neighbor. Geographical directions in the LDD file are coded with values from "1" to "9", with "5" representing pits (grid-cells with only inflow of water). Download the LDD file for EFAS v4.0 and earlier here: ldd_efas.nc (1MB)
Download the LDD file for EFAS v5.0 here: ldd_efas_5.0.nc
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GloFAS Auxiliary Data
The auxiliary data for GloFAS are provided as NetCDF files in WGS 84 (EPSG:4326), and are available to download below.
Three datasets are available to download:
- Upstream area
- Elevation
- The Local Drain Direction (LDD)
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The three datasets provided here are applicable for GloFAS version 4.0, and can be used for forecasts produced from 2023-07-26 onwards. For forecasts produced earlier than 2023-07-26, using GloFAS versions 1.0 to version 3.4, the appropriate auxiliary files can be viewed and downloaded by clicking the expand panel. |
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The upstream area file denotes the total upstream area for each river pixel, expressed in m2. The upstream area is defined as the catchment area for each river segment, in other words, the total area that contributes water to the river at the specific grid point. The upstream area always includes the area of the pixel. Download the upstream area file here: uparea_glofas_v4_0.nc (87MB)
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The elevation (sometimes referred to as orography) file denotes the mean elevation for each pixel in the GloFAS domain, expressed in m above sea level. It is defined for each grid point of the modelled domain. Download the elevation file here: elevation_glofas_v4_0.nc (87MB)
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The Local Drain Direction (LDD) in a hydrological model is the essential component to connect the grid cells in order to express the flow direction from one cell to another, and forming a river network from the springs to the mouth. LDD represents flow directions from each grid-cell to its steepest down-slope neighbor. Geographical directions in the LDD file are coded with values from "1" to "9", with "5" representing pits (grid-cells with only inflow of water). Download the LDD file here: ldd_glofas_v4_0.nc (21MB)
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EFAS Horizontal Resolution
LISFLOOD projection
The LISFLOOD operational model is setup over Europe with the spatial resolution of 5 * 5 km with the geographical projection is the INSPIRE compliant ETRS89 Lambert Azimuthal Equal Area Coordinate Reference System (ETRS-LAEA). ETRS-LAEA is a single projected coordinate reference system for the pan-European area. It is based on the ETRS89 geodetic datum and the GRS80 ellipsoid, and is the recommended projection for pan-European statistical mapping at all scales or for other purposes where true area representation is required. Its defining parameters can be found here.
Proj4 format: Proj4js.defs["EPSG:3035"] = " +proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000 +ellps=GRS80 +units=m +no_defs "
GloFAS Auxiliary Data
take information for GloFAS from the following pages: GloFAS available data (upstream area)
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In order to interpret the GloFAS output in a correct way, you will need static data that describes the model setup. This file denotes the total upstream area for each river pixel, expressed in m2. The upstream area is defined as the catchment area for each river segment, in other words, the total area that contributes water to the river at the specific grid point. The upstream area always includes the area of the pixel. You can download the upstream area file as netCDF here. |