- 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 – Norway
Quick Facts NDH DTM1
|Cell Size||1x1 m|
|Coordinate System||ETRS89 / UTM 33N|
Our elevation model of Norway is based primarily on the DTM1 data made available by Kartverket's nasjonal detaljert høydemodell (NDH) project, and has a grid resolution of 1x1 meter. The project started in 2016 and currently covers most of Norway. More data is being acquired continuously. 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 Norway including upstream areas of all rivers, we have extended the DTM1 model in the following areas:
- For Sweden we use Lantmäteriet's Laserdata Nedladdning, skog point cloud where available. In the figure below, this area is highlighted in green.
- For remaining areas of Norway and Sweden not covered by the NDH/DTM1 data, we have used the Kartverket's DTM 10 data set from 2013.
- To cover the upstream area of the Vefsna river (Nordland) in Sweden, we have included some data from the 30m EU-DEM data set, which in turn is based on SRTM and ASTER GDEM data (yellow in the figure below).
- To cover the upstream area of the Tana and Neiden rivers (Finnmark), we have included parts of the national Finnish elevation models:
A full overview of which data source is used for which part of the model
is available by clicking the gear icon next to an elevation layer, selecting the "Source" tab, and "Show source information". Use point query to see more details for individual areas as provided by Kartverket. Multiple styles are available for this layer to colour sources by e.g. collection date. Note that the DTM 10 data set is not shown since it's used everywhere no other data set
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 includes buildings as water can be simulated to flow around them. In SCALGO Live, we accomplish this by adding buildings back into the model using a data set of building footprints,. Here, we raise all grid cells covered by a building to a height of 10 m 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 footprint data set used is the FKB N5 Bygning data set from Kartverket/Geovekst.
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 Norway includes a nationwide hydrological correction set based primarily on the N20 Vann layer from Kartverket/Geovekst, as well as culverts (stikkrenner) from Statens Vegvesen's NVDB, Elveg 2.0 and the Banenettverk dataset from Bane Nor SF.
Corrections have been generated at locations where rivers intersect roads or railroads, as well as at river sections marked subsurface ("medium=U") where the river e.g. runs through a longer covered/piped area. Secondly, corrections have been generated at road overpasses and tunnels. Thirdly, NVDB's stikkrenner are included.
Each correction thus follows a line in the river or road network, or a known culvert, 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.
Soil type and land cover
Soil type: SCALGO Live uses the superficial deposits from Geological Survey of Norway for watershed soil type query. NGU's quaternary geological mapping (superficial deposits mapping) shows which type of soil predominates in the upper meters of the terrain surface. Thick and thin layers of other soil types may appear farther down the soil profile. We refer to Geonorge for more information.
Land cover: SCALGO Live uses the area type from NIBIO for watershed land use queries. We combined two area type data sets called AR5 and AR50. AR5 data is used by default, but it does not cover the entire area of SCALGO Live Norway. Where AR5 data is not available, we have used the coarser-resolution AR50 dataset. Where neither AR5 nor AR50 has data, the area is marked as unclassified.
If a category is the same in both AR5 and AR50, it will be merged into one category in SCALGO Live, e.g., the Skog category is present in both AR5 and AR50. Where AR5 has a finer categorization than AR50, we show the AR50 data as a separate subcategory. For instance, a watershed might include Jordbruk data which is just Jordbruk in AR50 but further subdivided in AR5. In that case, we include a special Jordbruk (AR50) category as a subitem under the general Jordbruk type. This ensures that the area covered only by the AR50 Jordbruk and not by one of the AR5 sub-types is still included in the total for the Jordbruk category. For an example of this, see the figure below.