SCALGO Live Documentation

What's New — May 2, 2017

New Hydrological Corrections

Today SDFE released updated hydrological corrections for the Danish elevation model from 2015, known as Denmark/2015 in SCALGO Live. These corrections, collected in 2016, significantly improve flow routing in many places and affect many of our analysis products (including the flash flood map, flow accumulation, watersheds and sea-level rise). We have updated our analysis products on the 2015 model to use the new corrections.

The bridge over the the Gudenå along the new freeway in Silkeborg is opened by a hydrological correction. The blue line shows the updated flow accumulation analysis.

The bridge was not represented in the old set of corrections, causing a significant detour of the Gudenå.

Workspaces

Your existing workspaces have not been updated, if you wish to update your workspace to use the new elevation model you can export all your workspace edits through your account page and then import those edits into a newly created workspace.

What's New — March 31, 2017

Elevation contours now available

We are proud to announce the release of three new elevation contour data sets in SCALGO Live, all based on the 0.4m national elevation model. They are available for immediate viewing and download in SCALGO Live.

Contour map

The contour map is used to depict the main features of the elevation model with pretty and smooth contours. It is available with an equidistance of both 0,5 meter and 2,5 meter. The elevation of a contour is guaranteed to not deviate more than half the equidistance from the underlying point in the model.

2.5m contours in the area around M√łns Klint.

Extremal points

The contour map is enriched by a set of extremal points. Those are points that are at the top of a hill or at the bottom of a depression. Each such point is annotated with the elevation value at that point.

2.5m contours with extremal points.

Reference contour map

The reference contour map very accurately conveys the information of the underlying elevation model. It has an equidistance of only 25 centimeters. The deviation on reference contours in relation to DHM is not only restrained to half the equidistance (as with the contour map), but also restricted to 80 centimeters in the plane i.e. the elevation on a reference contour can be found within 80 centimeters in the model.

0.25m reference kurves reflecting the full detail of the model at the cost of curve smoothness.

What's New — March 27, 2017

Download orthophotos as JPEG and PNG

You can now download orthophotos as PNG and JPEG files, great for working with the photos in image editing software such as Adobe Photoshop. Note that orthophotos are high-resolution and therefore very large, if you download a large area (e.g. larger than 1 km2) you are likely to run into issues when opening it in an image editing program.

Select the download format from the "Aerial Format" dropdown menu.

What's New — March 17, 2017

Subsurface structures in workspace

You can now create subsurface structures in workspaces. Using subsurface structures, you can simulate pipes and culverts without deforming the surface of the terrain model - thus flow on top of the subsurface structure is preserved. For more information read the announcement (in Danish).

A pipe under a field connecting a depression on the right, to a waterway on the left, modelled as a subsurface structure. The depression can drain into the water way and flow on the surface of the field is preserved.

What's New — December 16, 2016

Sea-levels in terrain profiles

We have added the sea-level to terrain profiles and changed the terrain profile tool such that the water level in the profile is continuously updated as the sea-level slider changes. This also works for the Flash Flood map.

Toogle between relative and absolute water depth

Relative water depths are shown on top of the terrain elevation. Absolute water depths are shown independently of the terrain.

Continuously updated point query results

Point query results are continuously updated when changing slider value.

Improved feature imports

When importing a terrain feature (by dragging a shapefile to the select tool of a Workspace), you can now choose between either using the elevation and width from an existing field on the feature or using a custom value declared in the UI.

Improved download names

Using the address data from DAWA we have improved the names of downloaded files by including a reverse geocoded name in the filename. This means that filenames will contain the name of a nearby street, city or region which makes it easier to distinguish between multiple downloaded files.

What's New — November 15, 2016

Updated orthophotos

The new nationwide orthophotos from spring 2016 are now available in SCALGO Live for both visualization and download.

On a field in Aabenraa a circus crew is working on their tent.

What's New — November 4, 2016

Models and analysis update

We have updated the elevation models and the analysis products (flash flood map, flow accumulation, watersheds and sea-level rise) to include newer buildings from GeoDanmark - acquired on August 4 2016 from Kortforsyningen. Your existing workspaces have not been changed.

What's New — October 21, 2016

User interface updates

We have added a number of features to SCALGO Live. Significant items in this release include:

Address search

You can now navigate to an address using the new address search bar

The source of the address data is DAWA, we have also switched to DAWA for the creation of workspace names. To fascilitate this change, the SCALGO Live instance switcher has been moved. Users that have access to multiple SCALGO Live instances will find the switcher in the gear menu in the top right.

Single Sign-On Support

We have implemented support for SAML-based single sign-on (SSO). If your organization wishes to use SSO for SCALGO Live please contact support for guidance.

What's New — September 28, 2016

User interface updates

We have added a number of features to SCALGO Live, fulfilling a number of popular feature requests:

Profile exports

You can now export profiles as CSV files, making it easier to import and graph the data in third-party tools. The export is initiated by hitting the green download icon in the profile window.

Moving features

You can now move entire workspace features at a time. To move a feature, use the select tool to select a feature, then press and hold the shift button while dragging the feature with the left mouse button to move it. To move polygons you can also place the mouse cursor in the interior of the polygon and drag the polygon with the left mouse button to move it.

Login improvements

You no longer stay on SCALGO Live Global upon logging in, instead you are automatically transferred to your Live Flood Risk page. Furthermore, workspaces are now folded by default (unless you're following a link displaying a layer from a workspace, in which case that particular workspace is unfolded).

What's New — September 6, 2016

GeoDanmark/FOT data, Matrikelkortet now available

The Danish Agency for Data Supply and Efficiency (SDFE) regularly releases extracts of a number of topographic and administrative geodata products including polygons representing the boundaries of the administrative subdivisions in Denmark (DAGI), topographic base data with road, railroad, and stream geometries, buildings, and much more (GeoDanmark/FOT), as well as Denmark's digital cadastral map (Matrikelkortet). From now on these datasets are fully accessible in SCALGO Live, including fast download of local extracts. The datasets will be updated regularly in the future. Along with this release the following changes have been made:

  • The "Administrative Borders" category is renamed to "DAGI".
  • All layers from the "Vector Subdivision" category can now be found in the "GeoDanmark" category.
  • The "DHyM Tilpasninger" layer is replaced by two layers in the new "Hydrological Corrections" category: "Denmark/Rain" and "Denmark/Searise", representing the set of hydrological corrections based on the old national Danish elevation model DHM/2007.
  • We have enhanced the display options. For example, the items in a GeoDanmark vector layer can be colored differently by their "FOT ID" to easily distinguish different objects, or uniformly in yellow, green, purple or blue to distinguish different layers. Polygonal data can be displayed with their outline only, so other data can be seen in the background.

Example showing some point layers from the GeoDanmark "Teknik" group colored differently, with municipality boundaries in the background.

What's New — August 17, 2016

New flash flood map

We are excited to announce a new major upgrade to the flash flood map in SCALGO Live. The new flash flood map is simpler to use and offers several benefits:

  • You can query, download and visualize the water depth in a depression.
  • You can easily get the volume of a depression, and the water volume in the depression.
  • You can view watersheds and flow for any amount of rain.
  • More powerful watershed queries highlighting the downstream sink of the query point.

Read more about the new flash flood map here (in Danish).

Example of one of the new tools: water depth for a flash flood event shown in the profile viewer.

What's New — July 11, 2016

Download of risk polygons

For certain raster-based flooding layers (e.g. sea-level rise, flooded areas of a Flash Flood Map, etc.), flood masks can now be downloaded as polygons. The polygons are simplified to greatly reduce file size and feature complexity and this makes them ready for use in GIS tools such as MapInfo, or as a basis for automated vector-based risk analysis and early-warning systems. Multiple thresholds can be specified to efficiently generate flood masks for different events, and the amount of simplification can be specified to control the complexity of the generated mask polygons.

Example of 1.34 m sea-level rise (blue area), with a downloaded (and imported) mask polygon in black on top.

What's New — March 17, 2016

Updated orthophotos

New nationwide orthophotos are now available on SCALGO Live for both visualization and download. The orthophotos were released by Styrelsen for Dataforsyning og Effektivisering earlier this month (release notes) and were sourced in 2015.

The new orthophoto has nationwide coverage.

What's New — March 10, 2016

Nationwide hydrology on the new DHM/2015 model now available

We have updated the Denmark/2015/Sea sea-level rise analysis, as well as the Denamark/2015/Rain watersheds and flow accumulation on the flooded model to have national coverage*. Previously, these layers were only available for Eastern Danmark. Interactive watershed queries using the watershed tool are also available nationwide.

For important information about hydrological corrections, please see our note.

The watershed (green) and downstream path (red) of a location in the DHM/2015/Rain model.

Comparing a section of a river network as extracted from the DHM/2015/Rain model (purple) and the older DHM/Rain model (blue). In this area, the new model correctly resolves the stream ensuring the water takes a correct path downstream. Both partial river networks are shown here visualized on top of the DHM/2015/Rain model.

We have also added a sea-level rise computation based on the DHM/2015/Sea model.

A 70 cm sea-level rise on the island of Lolland on the DHM/2015/Rain model (purple) and the older DHM/Rain model (blue). The older model does not correctly resolve the narrow dike protecting the coastal area from the sea.

(*) A few minor sections are not yet available due to missing data in the initial versions of the model put out by SDFE.

What's New — February 7, 2016

New flash flood map computation available with watershed download

The national flash flood map computation has been updated (see message below). We have also added a new feature; the watershed maps for the flash flood map rain events (i.e. the 10mm, 20mm, ..., 10cm watershed maps) are now available for download.

What's New — January 27, 2016

DHM/2015 variants and sea-levels now available nationwide

We have updated the Denmark/2015/Rain and Denmark/2015/Sea to have national coverage. We have also released the national Sea-Level analysis. All of the new elevation models are available for both workspace creation and download. For important information about hydrological correction, please see our note.

A 70 cm sea-level rise on the island of Lolland on the DHM/2015/Rain model (purple) and the older DHM/Rain model (blue). The older model does not correctly resolve the narrow dike protecting the coastal area from the sea.

Important bugfix to the flash flood map

We have identified an issue in the flash flood map which resulted in some basins not receiving contributions from flooded watersheds upstream of them. We have fixed this on our backend and all workspaces will get the updated flash flood map when they are recomputed. We are also updating the national computation and this will be rolled out during the next week. (Edit Feb 7th: The new national computation is now available).

What's New — January 6 2016

DHM/2015 now available nationwide

The Danish Styrelsen for Dataforsyning og Effektivisering has released the remaining areas of the new high-resolution Danish elevation model, extending the coverage to be national *. SCALGO is proud to announce that this updated model is now available in SCALGO Live under the name DHM/2015. The model is available for viewing, downloading and for creating workspaces anywhere in the country. The various derived models and hydrological layers will appear as they are ready, pending the completion of the model itself *.

Computation performance significantly improved

To meet the challenges of a new significantly larger national model we have also rolled out numerous updates to our backend infrastructure that enable us to reduce workspace recomputation time by up to a factor 7 in standard configurations, and even more in some cases. The changes include: fundamental algorithmic improvements to the computation software, new servers with upgraded disks, processors and memory and updated scheduling technology that increases parallelism of computations. The combined effect of all these is that workspaces on the new high-resolution model can be handled in almost the same time as similar-sized workspace areas in the old model before the upgrade.

Recomputation time of a 7 square kilometer workspace with default settings on the DHM/2015/Rain model.

The new national DHM model in SCALGO Live.

(*) A few minor sections are not yet available, these have been reported and we are waiting for updated data.

What's New — October 31 2015

Hydrology on the new DHM/2015 model now available

We have added flow accumulation as well as watersheds derived from the new high-resolution (0.4 m) DHM/2015/Rain model of Denmark which includes the existing hydrological corrections. The model is currently available for Eastern Danmark. Interactive watershed queries using the watershed tool are also available.

The watershed (green) and downstream path (red) of a location in the DHM/2015/Rain model.

Comparing a section of a river network as extracted from the DHM/2015/Rain model (purple) and the older DHM/Rain model (blue). In this area, the new model correctly resolves the stream ensuring the water takes a correct path downstream. Both partial river networks are shown here visualized on top of the DHM/2015/Rain model.

We have also added a sea-level rise computation based on the DHM/2015/Sea model.

A 70 cm sea-level rise on the island of Lolland on the DHM/2015/Rain model (purple) and the older DHM/Rain model (blue). The older model does not correctly resolve the narrow dike protecting the coastal area from the sea.

What's New — August 31 2015

New DHM/2015 Model - now with buildings

We have added a new elevation model to SCALGO Live. The model is called DHM/2015/Buildings and is a version of the new 0.4m Danish elevation model with building footprints, but without hydrological corrections. Thus, it sits between the base DHM/2015 model and the DHM/2015/Rain model added earlier this month. The model is a good starting point if the hydrological corrections included in DHM/2015/Rain do not fit your needs. The nationwide elevation model Denmark from 2007 was renamed to Denmark/Buildings to ensure naming consistency.

Frederiksberg Gardens in Copenhagen, from the new DHM/2015/Buildings model.

What's New — August 17 2015

New DHM Model

We have added the latest (as of early August 2015) version of the new 0.4m Danish elevation model DHM/2015 where (among other things) lakes have been flattened. The model is currently available for Eastern Danmark. More details are available at kortforsyningen. Additionally, we have put up two new models: DHM/2015/Rain and DHM/2015/Sea. They have been derived from the baseline model by adding building footprints, cuttting them to the national coastline polygon and by burning the current set of hydrological corrections (DHyM/Tilpasninger) into the model. The result is a model that is much more suitable for hydrological computations through workspaces.

TOP LEFT: View of a lake in the previous version of the DHM/2015 model. Note the triangulation artifacts over the flat surface. TOP RIGHT: In the new DHM/2015 model the surface of the lake has been flattened. BOTTOM LEFT: View of the baseline DHM/2015 model. BOTTOM RIGHT: The new DHM/2015/Rain model has both building footprints and hydrological corrections included.

What's New — May 2015

Watershed Tool

The watershed tool has gained some powerful features. You can now export the watersheds as a Shapefile by using the export button in the watershed information dialog. The result will be a simplified approximate version of the watershed polygon suitable for e.g. reports. The "area" field of this polygon contains the area of the original unsimplified watershed. Furthermore, you can now see the area of the watershed in the watershed information dialog (this is not yet supported for all layers).

River network downloading

Flow Accumulation layer downloads now use the specified Flow Network Detail from the user interface. Thus, the level of detail of the downloaded vector file will match the level of detail displayed on the screen. This makes it easy to download just the main rivers and tributaries by setting an appropriate detail level. As before, the segments in the downloaded file have a field specifying their flow (that is, upstream area).

Point query tool

There are two bigger changes to the point query tool:

  • You can now choose a coordinate system used for locations on the map. Currently we support UTM Zones 32N and 33N as well as lat/lon.
  • Ad hoc layers, generated when dragging e.g. Shapefiles into the layer menu, are now queried along with the regular layers.

What's New — April 2015

Ad hoc layers

You can now drag and drop Shapefiles (or a zip-file containing a Shapefile) into the layer selection menu on the left. This will import the features as a separate layer (an ad hoc layer) which allows you to quickly visualize and use reference data you might have lying around. Note that this feature isn't meant to be used for big Shapefiles, it's simply a quick in-browser way of reviewing smaller data sets. Ad hoc layers will disappear when refreshing the page.

Rank Display

For workspaces we now show the rank of overlapping segments so you can more easily order them in the order you want them applied to the model.

X/Y labels on profiles

Profiles now display an x-axis and y-axis, making it easier to work with the data.

Better support for vector files

We now support both MultiLineStrings and a number of the most common projections when importing files through drag and drop. If the projection you use for storing your data is not supported, just send us the EPSG code or some other information about the projection, and we can look into adding it.