- 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 – Great Britain
National LIDAR Programme
|Cell Size||1x1 m|
|Vertical Reference||OS Newlyn Datum|
Our elevation model of Great Britain is based primarily on open LIDAR composite DTM models made available by the Environment Agency, Natural Resources Wales, and the Scottish Environment Protection Agency. The Environment Agency National LIDAR Programme started in November 2016 and aims to have coverage of all of England by 2021. 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 England, Wales and Scotland, we have extended the open LIDAR data from the UK government in the following areas:
- For the parts of England not yet covered by the National LIDAR Programme, we have used the older Environment Agency 1m DTM, and for parts not covered by the 1m DTM we have used the 2m DTM.
- For the parts of Wales not covered by the Wales 1m DTM, we have used the Wales 2m DTM.
- For the parts of Scotland not covered by the LiDAR for Scotland Phase 4 DTM, we have used the Phase 3, Phase 2 or Phase 1 DTM, as well as Environment Agency's "LIDAR Composite DTM for Scotland".
- For the parts not covered by open LIDAR datasets mentioned above, we use the 30-meter EU-DEM dataset, which in turn is based on SRTM and ASTER GDEM data.
A full overview of which data source is used for which part of the model is available clicking the gear icon next to an elevation layer, selecting the "Source" tab, and "Show source information". Use the point query tool to highlight a coverage area and see the name of the source.
Bridges and underpasses
Major bridges have generally been removed from the models delivered by the Environment Agency, making most bigger rivers able to flow freely to the sea. However, for many smaller bridges and underpasses, additional "hydrological corrections" may be necessary. These can e.g. be made through workspaces in SCALGO Live.
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 Ordnance Survey OpenMapLocal Building dataset.
Major rivers have been lowered in the elevation model to ensure that water can flow freely to the coast. The river lines are taken from the Ordnance Survey Open Rivers dataset.
We have removed parts of the LIDAR models that are off the coast, as the data is generally unreliable. The coastline is taken from the Ordnance Survey Open ZoomStack vector dataset, layer named "Land".
Base map and aerial photography
The default map view when you go to SCALGO Live shows the Ordnance Survey Open ZoomStack map, rendered in the "Outdoor" style. Other map styles are available through the gear menu on the "Base Map" layer. The street names and place labels are sourced from OpenStreetMap. You also have the option of viewing Aerial photography provided by Mapbox.