Tuesday, 26 May 2020

Digital terrain models help create a picture - Part II

The previous post showed how digital terrain, surface (add buildings & vegetation) and elevation (detail topography) models highlight geomorphology (land features) and infrastructure (roads, canals etc.). That was in the Cambridgeshire area of the southern Fenlands of East Anglia, as a complement to sea level rise models from coastal inundation, as well as flood risk maps from rivers and from sea.

Saturday, 23 May 2020

Digital terrain models help create a picture

The previous blog showed how to effectively portray coastal inundation, as it progresses inland from the encroachment of sea level rise. These were base on 30 m. resolution Digital Elevation Models (DEM) from OS OpenData as explained previously here.

DEFRA's Risk of Flooding from River and Sea - yet another contributor to coastal inundation discussed here - lead me to DEFRA's high resolution Digital Terrain Model data. In the vast catalogue we used DTM and DSM, respectively, digital terrain and digital surface with buildings and trees atop.  Ranging from 25 cm. to 2 m. resolution, they are very large and many-tiled datasets. Mid-range 1 m. resolution is available as a web mapping service, both from  the mentioned DEFRA site, and as Authoritative features in ArcGIS Online as DTM and DSM, with in addition an Elevation rendering.

Thursday, 7 May 2020

Low tech / high tech map updates, Part II

[ Update: the next blog details and updates this via a story map and new data ]

Part I showed how high contrast map symbology of Sea Level Rise can be transferred to a paper map to take around events. When asked if I could scan and reprint that paper map, I thought: why print a hand-transfer, why not print the digital original? Better still: why not try and enhance that digital map to really give an impression of sea level rise gradually invading the land?

Friday, 1 May 2020

Coronavirus daily update - Part III

Update: ONS weekly numbers maintain difference with NHSx at same level shown ]

Following on Part II adding local data for East of England, let's add weekly deaths (two weeks out of date) from ONS here and here, including counts outside of daily hospital deaths (two days out of date) from NHSx. Here is a graph of the raw data collected from both sources, since end-January onset of the pandemic in the UK.