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).

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.

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.

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.

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

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

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.

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.

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).

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.

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

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.

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

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.

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 Denmark. 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, cutting 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.