John Snow's Cholera Map Reimagined
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- Опубликовано: 25 июн 2024
- John Snow's map of the 1854 London cholera outbreak was revolutionary in that it clearly drew a visual connection between deaths and the locations of well pumps. It helped convince authorities that cholera was a water borne disease and effectively created the field of epidemiology.
I'll reimagine the making of this map to even more directly connect the fatalities to the wells, using some GIS tools to estimate walkable neighborhoods served by each well, aggregate the fatalities within each neighborhood, and visualize the wells by that aggregate. Connecting two separate phenomena that aren't actually all that separate.
Here is a link to the finished map: adventuresinmapping.files.wor...
0:00 Lets take a look at the amazing original map
1:28 How to overlay the original map and a GIS basemap at once (and change its color!)
2:20 The visual (and moral) problem of overlapping data points
3:13 Slightly shuffling the visual placement of overlapping points (for the greater good)
4:41 Creating walkability zones around water pumps
7:11 Aggregating cholera deaths into water pump neighborhoods
7:46 Transferring these aggregates to the water pump points
8:43 Visualizing water pumps as vertical extrusions
11:07 Creating a shadow effect for the extrusions
11:52 Making a monochromatic minimalist basemap
13:10 Visualizing uncertainty by making boundaries wavy
14:00 Creating a layout
14:46 Adding graphical label and title
16:56 Visiting the garden and feeding the rabbit some kale
Here are some intro and closing thoughts about this sort of undertaking: adventuresinmapping.com/2023/...
Check out some other social channels where I share how-to's and updates on random map adventures:
adventuresinmapping.com
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Here's a companion blog post with a bit of intro/closing thoughts about this sort of undertaking: adventuresinmapping.com/2023/12/07/john-snows-cholera-map-reimagined/
This is such an epic map, and used so often during Covid. John, another fantastic video - thank you as always. Keeping us GIS geeks "real".
thanks so much!
Please keep uploading content, I had a professor at my collge show me your videos and I have been a follower ever since. They are great to revisit for inspiration !
Thanks Johnny!
I love your channel, John. It's so informative, and I've really taken maps that I produce for my job to the next level thanks to your channel. My only complaint is that you don't release videos more frequently!
Seriously, thank you for all you do for people like me.
ha, thanks James!
John, this is a great video..love the music and narration! You have the "Bob Ross" vibe going throughout the video. Thanks for sharing and looking forward to many more awesome maps!
Thank you!
Really cool map! and awesome content! Really appreciate the dives into the technical cartographic nuances in ArcPRO that your channel provides!
Thanks!
Great as always John!!! Thanks for all you do!
Thanks Aaron!
Watching your videos is always such a treat! Thanks for sharing your process.
thank you! i'm having fun and i'm grateful you watch.
I haven't used a GIS program in 15 years; this video was obviously technically dense without being a drag for non professionals. Absolutely great at sharing information and inspiring design.
thank you Gregory!
Wow! Such an informative, creative and innovative video! Thankyou so much for making this video. I learned so much in these 18 minutes.
great, glad you enjoyed it, Pratik!
I made this same vertical stack map back in 2009 to get a GIS consulting job with our county health department. I also made several other visual displays of the same data to illustrate what I could do with the data they already had. Their in-house GIS guy was using ESRI at the time, and I was using Manifold. I'm not certain that, back then, ESRI had the tools to do everything that Manifold did, so I got the job.
If you read the book about this bit of history, it explains why there are no deaths reported two blocks to the NE on Broad Street. That block was a brewery, and everyone there drank beer instead of water from the pumps. Another aspect of this detective work was that a clergyman in the neighborhood disagreed with Dr. Snow about the cause and set off to disprove Snow's claim by doing his own interviews to collect data. In the end the clergyman agreed with Snow and they combined forces to help end the problem.
The problem resulting in the cholera outbreak at the Broad Street pump was disposal of diaper materials too close to the pump well. Pumps and cesspits did not have enough distance between them, and the clay used for the pipes was easily broken leading to cross contamination.
I used manifold for a while many years ago. Your approach to applying for the job sounds brilliant.
Yes, I read the Ghost Map. Great book. I was astonished at how much poop there was everywhere in the urban environment. Basements filled with dumped raw sewage. And farmers who harvested the “night soil”.
Cool, Thank you.
No problem!
Phenomenal work, Sir.
Thank you!
Everything about this video is fantastic.
thank you! i hope there are some elements that will be useful in different ways. it went on sort of long, but that's how it goes.
That's a thing of beauty sir. I enjoyed the original and this is even more ... more. If that's a thing.
thank you Simon!
Thanks John, this is too good !
Thanks!
Inspiring work!
thanks Craig!
VERY Nice!!!
Thank you! Cheers!
My favourite part was the rabbit. The map was cool too
i'll take it! thanks!
Thank you John for your view of the classic map. Most of us think at least about re-doing our own or classic maps like this one. I liked your colour choices for the map.
A while ago I have suggested you to make a short video of layers from Living Atlas & ArcGIS Online you use in your maps, like Outline in this one. Are there any chances of making that video? Pretty please. 🙏
thanks Zorko! i tend to shy away from red except for danger or warning. and this seemed like a topic that could accommodate red.
i have been trying to highlight Living Atlas layers in my maps since your good suggestion. you might notice me adding Living Atlas content in almost every video.
Monsters!
MONSTERS
Do you have any tips for creating fake data for maps? I'm working on a map of a fictional area and all the ideas I have for creating topography for them is incredibly tedious. Any and all tips are welcome!
you might like my friend Carl Churchill's technique: www.churchillgeo.com/making-terrain-for-fantasy-maps-from-scratch/
@@JohnNelsonMaps this is exactly the kind of thing I want to do! Thank you!
@@JohnNelsonMaps That is a good technique. After watching dozens of videos from game programmers about generating terrain, I always wondered why no one somehow remixed real terrain. I suppose game programmers want to make their terrain much faster and more expansive than your average cartographer, though.
The best
Thanks!
17:08 No snow although the video was inspired by Snow‼
ha! true. we are having a very mild early winter here in michigan!
Is there a way to get this dataset? Is it included with ArcGIS? Thanks
no, sorry, it was manually assembled by a friend for use in his project. he shared it with me.