Digital terrain models help create a picture - Part II

[ Update: see new arcgis.com interface for another view of this here & under Update 5 here ]

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.

Digital terrain models help create a picture

[ Update: next post discusses same in the East Anglia coastal area of the Fenlands ]

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.

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?

Listen to the Scientists - Part II

[ Update: a later post shows another outreach tool, a poster depicting sea level rise scenarios ]

Part I showed web maps of London and East Anglia under 0.5, 2 and 6 m. sea level rise by mid-, end- and next century in moderate, far-tail and extreme IPCC emissions scenarios, respectively. The next post updated a simple approach to the public using paper maps, which are both visually arresting and factually correct. Videos are also an effective way to convey complex scenarios by animating those maps, and setting them in regional and local contexts. They help illustrate the climate emergency.

Listen to the scientists

[Update 2: in Part II, XR Cambridge Rebel Scientists produced a video tying it all together
Update: East Anglia Fenlands + London Thames Valley inundation models now on YouTube!]

This is what happened at the first Extinction Rebellion Cambridge working group of concerned  scientists, on the topic of sea level rise (SLR) among many others discussed then. As posted earlier here, the scientific consensus lies at 0.5 and 2 m. SLR by mid- and end-century in moderate emissions and far-tail scenarios, respectively. That meeting reiterated, however, the importance of an extreme scenario, ~ 6 m. SLR from the melting of various ice sheets: 7 m. is in fact the default SLR setting for the original sea level rise map, flood.firetree.net.

Climate Emergency maps as easy as 1-2-3

Almost 2½ years ago I blogged then presented Emergency response maps as easy as 1-2-3 - in fact that helped spur on my current venture described in previous posts - and now apply the same to do inundation maps from sea level rise as well as river run-off.

Areas affected by sea level rise scenarios

Local Community Engagement 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, & 12

[ Update: There follows a tally here of what we've collected so far. ]

So far we've looked at sea level rise, timing, temperature regime and risk of flooding from land and from sea. These scenarios were developed using open data from Ordnance Survey and Climate Central for elevation models, UK Met Office for temperature and DEFRA for flooding. This was also put in a time and IPCC scenario context from scientific publications.

The second most important thing  for East Anglia Fenlands residents after the timing of such scenarios, is the actual areas affected by them. Having collected all the underpinning information, it was a matter of overlaying climate data with settlement data: infrastructure was posted in Part 2  from OS Open Zoomstack, and settlements were posted in Part 6 as a local Wikimedia gazetteer.

Flood risk model

Local Community Engagement 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 &11

[Update 1: Part 12 describes Cambridgeshire Parishes affected by sea level rise
Update 2: here is a Story Map that explains the background info to this project
Update 3: this Story Map relates flash floods and not river or coastal inundation]

Temperature Regime

Local Community Engagement 1, 2, 3, 4, 5, 6, 7, 8, & 9

[Update: Part 10 follows up village engagement process via recent Parish Council update]

Coastal Inundation

Local Community Engagement 1, 2, 3, 4, 5, 6, 7 & 8

[Update: Part 9 on temperature anomaly scenarios further constrains the debate]

Mock Press Release

Local Community Engagement 1, 2, 3, 4, 5, 6 & 7

[ Updates: Part 8 on coastal inundation scenarios adds some parameters in the debate.

Part 13 is a manifesto that wraps the series together with some forward looking ideas.

"Digital nomads and digital divides" posted in Parliament late 2020 is discussed here. ]

Wikipedia Gazetteer

Local Community Engagement 1, 2, 3, 4, 5 & 6

[Update: Part 7 shows a draft Press Release introducing our social enterprise]

Welcome to new friends

[Update: read here my  new occupation following this]

A fond farewell to two old friends explained my transition to open source platforms. As announced in LinkedIn You can get Andrew out of the geo... (... but you can't get the geo out of Andrew) "Terry Jackson pulled me back in to the publishing business as a data wrangler". What does that mean?

Maps are forever (Part III)

My first post on this theme traced beautiful medieval maps from the British library in London to the Harvard Libray online, to land on a 1610 beauty.

Andrew Zolnai map catalog

Happy New Year! Don't you think that 175 blog posts and almost 150,000 page views over 7.5 years merit a catalog of my maps? This also coincides with my first end-to-end project:

1. collect on the desktop
2. disseminate and receive feedback via social media
3. post as a webmap on private AWS account

Releasing data really works, Part V

It took five days (after hours) to stand up, learn, tweak and display my East Anglia Fenlands project on Mapcentia's web service. It started with a GISuser group post on LinkedIn on Monday, I used my Amazon Web Service free EC2 trial and GeoCloud2 under beta, and by Friday I had it working and styled. No small thanks to Martin Hogh's original work and help, the result is a simple yet modern and pleasing web map.

Releasing data really works! Part IV

[Update: this was summarised into a story map here posted also on this blog here]

Two years then one year ago I QC'd UK Ordnance Survey data for East Anglia, and sent the polyline spike and kickback errors to the Agency, who posted the corrections this year. They noted the errors I reported fell below their own QC criteria, but they invited me to retest their updated dataset. This issue is topical as  posted on GISlounge on the same topic proposing other tools.

Releasing data really works, Part III

More and more free data are available that are quality-controlled and verifiable. Guardian Data Blog's @smfrogers (now at Twitter) was quite sanguine about this:

Comment is free, but facts are sacred

Maps are forever (Part II)

I wrote earlier about a 1610 map from the Harvard University Library of the Cambridge UK region, a snapshot of which I simply edited the tear and restored it by eye-balling it in Photoshop Elements. I detailed before some local history and geology too.

Maps are forever...

... or they are Man's best friend. I'm a big fan of the British Library, not only because it's next to Kings Cross station I alight when coming to London often (or rarely hop onto the Eurostar at nearby St Pancras to Bruxelles or Paris) - bl.uk has an amazing array of old maps, which they just finished georeferencing through a significant effort in crowd-sourcing (the 21st. c. variant of volunteering).