- Getting Started & Use Cases
- Organise and communicate on a digital canvas
- New sidebar to help organize your analyses and queries
- Sliding contours
- Ny skyfallsanalys och en ännu bättre marktäckekarta
- New land cover map for Finland
- Depths in the depression map
- New Danish land cover map with more classes
- National Swedish High-Resolution Impervious Surface Mapping
- Watershed tool updated with even better descriptions of catchment characteristics
- National Flash Flood Map with Infiltration and Drainage for Denmark
- Add your own WMS layers to SCALGO Live
- Enriched building data in Denmark
- National hydrological corrections and Land Cover for Poland
- National hydrological corrections for Norway
- Updated Impervious Surface Mapping for Denmark
- National hydrological corrections and updated local data for Finland
- Fast and intuitive tools to work with infiltration and land use
- Improvements to vector imports and exports
- National Danish groundwater model
- New Sweden high-resolution model
- New powerful depression map and more analyses visualization options
- Introducing Modelspaces: Get your hydrodynamic models into SCALGO Live
- Use case videos
- Access a EA flood maps inside SCALGO Live
- Improved map export
- New powerful ways to edit the elevation model
- Better coloring of flooding layers and sea-level depth filtering
- National Danish High-Resolution Impervious Surface Mapping
- National access for local and regional organizations
- Simpler, more powerful downloads
- Customize Layer Transparency
- Hydrological corrections and new data in Sweden
- Improved export functionality
- Access a wide range of authorative data inside SCALGO Live
- Importing VASP data
- Measure gradients, undo edits, and Norway updates
- New terrain edit features, soil balance information and much more...
- Browse historical orthophotos in SCALGO Live
- Emergency planning with sea-level rise from national forecast data
- Detailed information about watershed composition
- Better styling of imported vector layers
- New Danish Elevation Model
- Work with gradients in the profile widget
- Flood risk screening from rivers and flow paths
- New workspace tool: Raise and lower terrain uniformly
- Importing LandXML TINs, LAS point clouds
- New model in Sweden
- Side slopes on workspace features
- Drag and drop enhancements
- Swedish contour maps
- Subsurface basins and sewage drains in workspaces
- New Interface
- Volume information for watersheds and flow paths
- New powerful tool for emergency response and coastal flood prevention
- Denmark: New flash flood map
- Sweden: Geodatasamverkan setting for Swedish users
- Import custom terrain models
- New Hydrological Corrections
- Elevation contours now available
- Download orthophotos as JPEG and PNG
- Subsurface structures in workspace
- Sea-levels in terrain profiles
- Updated orthophotos
- Models and analysis update
- User interface updates
- User interface updates
- GeoDanmark/FOT data, Matrikelkortet now available
- New flash flood map
- Download of risk polygons
- Updated orthophotos
- Nationwide hydrology on the new DHM/2015 model now available
- New flash flood map computation available with watershed download
- DHM/2015 variants and sea-levels now available nationwide
- DHM/2015 now available nationwide
- Hydrology on the new DHM/2015 model now available
- New DHM/2015 Model - now with buildings
- New DHM Model
- Watershed Tool
- Ad hoc layers
- Nationwide contour maps for all countries
- User Interface
- Streams and Flow
- Country Specific
Country Specific – France
Digital Terrain Model
|Cell Size||1x1 m|
|Vertical Reference (Corsica)||NGF-IGN78|
Our elevation model of France is based primarily on the Digital Terrain Model (fr. Modèle Numérique de Terrain) named RGE ALTI®, made available by the IGN (Institut national de l'information géographique et forestière). We strive to keep our model up to date with the latest sources.
In order to use an elevation model for hydrological analysis such as watershed and flow accumulation computations, two primary conditions need to be met:
- The upstream area of any river should be covered by the elevation model.
- Structures on top of the terrain should only be present in case they actually block water from flowing under or through them.
Below, we discuss how we process the model to fulfill these conditions as well as possible.
In order to cover all of France including upstream areas of all rivers, we have extended the DTM from the government of France with the 30-meter EU-DEM data set, which in turn is based on SRTM and ASTER GDEM data.
A full overview of when the elevation data in France was acquired is available by going to the Library and enabling the "Acquisition date" layer, found in the Elevation category.
Bridges, underpasses and hydrological corrections
Major bridges have generally been removed from the model, but for many smaller bridges and underpasses, additional hydrological corrections that allow water to flow through such structures may be necessary. SCALGO Live France includes a nationwide hydrological correction set based on layers from the BD TOPO® dataset, made available by the IGN. Corrections have been generated at locations where rivers intersect roads or railroads, as well as at river sections that overlap with sluices (écluses). Secondly, corrections have been generated at road overpasses and tunnels. Each correction thus follows a line in the BD TOPO® river or road network, with end points adjusted to match the elevation model as well as possible. In places where the elevation model is already hydrologically corrected (e.g. at large bridges), corrections are not generated.
This data set is machine-generated, so some errors should be expected. However, since we only include corrections along known river and road lines, we believe it to be conservative in terms of water flow.
The set of corrections is available under the Hydrological Corrections category in the Library.
The national analyses use these corrections, and workspaces created using the predefined "Flash Flood Map" or "Sea-Level Rise" buttons also include them by default. If you create a workspace through any other means than the predefined buttons (e.g. if you upload your own model), you can include corrections in that workspace through the workspace Actions tab by clicking Import corrections, they will not be included automatically.
Apart from vegetation and major bridges, also buildings have been removed from the terrain model during construction. When computing water flow paths, more realistic results are generally obtained when the elevation model does include buildings so water can be simulated to flow around them. In SCALGO Live, we accomplish this by adding buildings back into the model using a dataset of building footprints, where we raise all grid cells covered by a building to a height 10 meters above the highest terrain point within the building footprint. This model is called "Terrain/Buildings" and is the basis for all nationwide hydrological computations.
The building footprints are taken from the BD TOPO® Batîment dataset.
Base map and aerial photography
The default map view when you go to SCALGO Live shows an overview map from IGN. The street names and place labels are sourced from OpenStreetMap.
You also have the option of viewing an aerial photography map from IGN.