SCALGO Live Documentation


Country Specific - Denmark

Our Danish elevation model is based on the official Danish elevation model (also known as DHM) produced by the Agency for Data Supply and Efficiency. The model has a horizontal resolution of 0.4 m, much higher than the previous model from 2007, where the resolution was 1.6 m. Since 2018, SDFE has been updating the elevation model from 2015 in partial increments of about a fifth of the country every year. This model is available in SCALGO Live under the name Denmark. There are a couple of different variants of the model available.

Denmark/Buildings (Danmark/Bygninger): This is the raw model enriched with building footprints from the national GeoDanmark data set. For each GeoDanmark building footprint, we've raised the elevation of the cells there are inside the buildings with 10 m, relative to the highest elevation value of the original Denmark model.

The Danish elevation model with GeoDanmark building footprints.

Denmark/Rain (Danmark/Regn) and Denmark/Sea (Danmark/Hav): Both models are derived from the Denmark/Buildings model and include the set of hydrological corrections from GeoDanmark.

Denmark/Rain includes the corrections made for modeling water flowing downstream on the terrain, e.g., water from rain events. Denmark/Sea is targeted for modeling flooding from sea. The main difference between the two models is infrastructure like sluices, and whether they are open or closed.

A hydrological correction cutting through a bridge in the Denmark/2015/Building model.

Denmark/Surface (Danmark/Overflade): This is the Digital Surface Model (DSM) version of the DHM. In this model houses, vegetation etc. is preserved in the elevation model.

The DSM for a section of downtown Aarhus.

Denmark/Sources (Danmark/Oprindelse): The sources layer shows the acquisition year of the data from the Denmark elevation model. Use it to figure out how old the data is for your project area. You can use the point query tool to get the acquisition year for a particular area.

Each color represents a different acquisition year.

Denmark/2015 (Danmark/2015):

This is the version of DHM put out in 2015, but no longer updated by SDFE.

Denmark/2007 (Danmark/2007):

This is an older model of Denmark released in 2007 based on scans from 2005-2007. It has a horizontal resolution of 1.6 m.

Imperviousness (Befæstelseskort)

The impervious surfaces map in SCALGO Live is produced by SCALGO based on machine learning techniques at a resolution of 20 cm. It is available as a standalone layer in the Imperviousness category in the library.

A section of the impervious surface mapping.

The mapping of impervious surfaces segments the country into 3 different classes: pervious, impervious and lake. The impervious class is further subdivided into a building category and a general other impervious category. The map is based of data from 2014-2016, although the buildings are more recent. The categories have the following numerical encoding: 1 for pervious, 3 for impervious, 4 for lake, and 5 for building.

The map is indirectly available through other layers in SCALGO Live as well:

Watershed queries

When you perform a watershed query you get the total area of impervious surfaces in the watershed.

A watershed query showing watershed imperviousness statistics.

Annotated administrative regions

We have annotated a number of datasets, including the cadastral parcels, sewer catchments, planning zones as well as municipal regions with information about imperviousness. You can find those layers in the Imperviousness category alongside the impervious surfaces map itself. For each region in those data sets we have added a field that provides the total impervious area in the region, as well as the ratio of imperviousness to perviousness in the region.

A point query on the cadastral map showing the impervious surface area and the ratio of a cadastral polygon.

Soil type (Jordartskort)

SCALGO Live uses the Jordartskort (1:25.000) from Geological Survey of Denmark and Greenland (GEUS) for watershed soil type query. Jordartskort is based on a systematic mapping where soil samples are taken at 100-200 meter intervals. We refer to an article published by GEUS (in Danish) for more information on soil sampling.