@stevefaeembra@mapstodon.space
@stevefaeembra@mapstodon.space avatar

stevefaeembra

@stevefaeembra@mapstodon.space

Web developer. Steve from Edinburgh.
I make maps with QGIS and Blender

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jhilden, to random
@jhilden@vis.social avatar

Trying to make a Win III projection centered on the Pacific.

Is there any good way to deal with this rendering problem in QGIS, when shapes are split by the projection but then drawn as connected across the map?

#GisChat #QGIS

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@jhilden Try the 'Shape Tools' Plugin,Vector > Shape Tools > Geodesic Line Break #Gischat #Qgis

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@jhilden

Ah, hadn't noticed you were centering on the antimeridian. D'oh 🤦

In that case, you want to clip everything to the prime meridian. I'd maybe import two WKT rectangles, one for the westwern hemisphere and one for the eastern hemisphere e.g. for western hemisphere

POLYGON((-180 -90 -180 90 0 90 0 -90 -180 -90))

You can use the WKT plugin to do this, or do it as a 2 line CSV import.

Then, clip the natural earth data to each hemisphere in turn.

stevefaeembra, to blender
@stevefaeembra@mapstodon.space avatar

World Map. Attempting the look from the world map in the film Mars Attacks! Backlit neon look.

#qgis, NaturalEarthData and export to SVG then modelled in #Blender

stevefaeembra, to random
@stevefaeembra@mapstodon.space avatar

I'm trying to identify an office I worked in for a few months. I'm struggling to remember where this was 🙂

  • mid 2000s
  • in south of England
  • a financial company,
  • large crescent-shaped modern building, with a bit of a moat.
  • to the south, there was a village with a square church tower, very visible.
  • Road went south to north, then turned 90 degrees and went east.
  • i have photos taken around the time suggesting it was near Solihull

Anyone got any suggestions? Here's a napkin map.

stevefaeembra, to edinburgh
@stevefaeembra@mapstodon.space avatar

Visualising house numbers in . Height is in proportion to house number. Done in and .

Generally, numbers increase going away from the city center (the bollard outside the old post office across the road from Balmoral Hotel).

But I find roads on a slope tend to have numbers increase as you go up the slope.

stevefaeembra, to random
@stevefaeembra@mapstodon.space avatar

Just found some #Openstreetmap swag, a carrier bag. Anyone know when this dates to?

Have no recollection when I got this, or how. I went to SOTM 2013 and various local meetups in Edinburgh since then. I think the binary under the magnifying glass dates it to be on the older side, early 2010s?

stevefaeembra, to edinburgh
@stevefaeembra@mapstodon.space avatar

How #Edinburgh would change if sea levels rose by 66m. That's supposedly the level the sea would rise if all ice at the poles melted.

Used #Qgis and #Blender. Used the "flood order" in Whitebox Tools to drive sea level rise, rather than just subtracting elevation.

Take with a pinch of salt, should probably edit out the various Bridges.

A map of Edinburgh, with sea levels rising up to 66 meters above current level.

stevefaeembra, to edinburgh
@stevefaeembra@mapstodon.space avatar

Animation showing rings equidistant from #Edinburgh. #Qgis and #Blender.

Used QGIS "Shape Tools" plugin to make the geodesic rings. It also has a nifty feature to fix discontinuities/artifacts along 180 E/W. Worth installing for that alone. 🙂

Animation lasts ~7 secs, light takes 68 ms to orbit to antipode, so this is like visualising a wave advancing at light speed slowed down by a factor of about 100.

A globe slowly spins from Edinburgh Scotland, eastward towards just off the coast of New Zealand. A bright neon ring expands outward then inward, marking places at the same distance from Edinburgh.

stevefaeembra, to edinburgh
@stevefaeembra@mapstodon.space avatar

Strip map of The Royal Mile in #Edinburgh, done in #Qgis and #Blender. Added a magnifying glass. #gischat

EDIT: Forgot attribution, used data copyright OpenStreetMap contributors. Normal qgis 'densify by interval' didn't work (too much detail?), but Geodesic densify did (from the 'Shape Tools' plugin)

A strip map pans from right to left. A magfifying glass distorts the map.

underdarkGIS, (edited ) to random
@underdarkGIS@fosstodon.org avatar

Yay or nay? What do you think about these squiggly lines as a solution for visualizing overlapping lines?

This is just a small sample dataset from #scikitmobility, visualized using #QGIS and #Trajectools

#MovingPandas #MovementDataAnalytics #GISChat

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@underdarkGIS

How about using a single straight line between nodes, but using coloured dash patterns? So the top line would have salmon, turquoise and blue repeated over the length of the line?

(I have no idea if Qgis can do this. 😅 )

terence, to random
@terence@fosstodon.org avatar

Shipwrecks of Ireland, 1530 to 2017.

#rayshader adventures, an #rstats tale

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@terence Nice!

I've seen similar data for UK waters, from The Admiralty. Two things always surprise me, how many are close to shore, and how far 'inland' they can happen.

Should be obvious, ships run aground on rocks and sandbanks, and those are generally close to shore where the water is shallower. But it still feels unintuitive for some reason!

stevefaeembra, to edinburgh
@stevefaeembra@mapstodon.space avatar

#Edinburgh 23 bus route, video strip map. Done with #qgis and #Blender, OS OpenZoomStack crown copyright and database right. Going from Greenbank in the south to Trinity in the north.

A slowly scrolling map, showing buildings near the 23 bus route in Edinburgh. The bus route has been straightened out and the space around it warped to be perpendicular to the route

stevefaeembra, to random
@stevefaeembra@mapstodon.space avatar

#qgis question. 🙂

Does anyone know of a :qgis: plugin which will take a LINESTRING and sort the features so that each segment flows in the same direction? So the end vertex of one feature is the start vertex of the next?

'Join Multiple Lines' looked promising but it errors on install.

Tried 'Points to path' after an 'extract vertices' but I end up with a cat's cradle

Or will it just be easier to manually digitise a new layer tracing over the old one?

#Gischat

stevefaeembra, to edinburgh
@stevefaeembra@mapstodon.space avatar

Today's walk was a tour of the shortest streets I could find in #Edinburgh. The following are the 5 shortest streets that I'm aware of.

Allen Street is in #Stockbridge. It used to be longer, but got truncated in the 60s. There appears to be one stairwell, taking to 3 flats at the rear of St Mary's Place. Adopted by council. Length 25m

OSM map link : https://osm.org/go/evfLPKugB

1/5 🧵

terence, to random
@terence@fosstodon.org avatar

Roads of Hokkaidō, take two. Just the roads as gently extruded lines this time.

I also tried QGIS and it's much faster drawing only lines. But am running into issues trying to export a hi-res image (>= 1600 dpi) without getting a corrupted image. Any ideas?

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@terence what's the format? And what does QGIS show as the output size? 1600dpi seems quite high, PNG tops out at 32k by 32k IIRC

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@terence is it from 'project > save as image' or output from qgis print composer?

The latter lets you turn off anti-aliasing, which might let you keep some sharpness at lower dpis. (It looks really impressive at full size!)

stevefaeembra, to blender
@stevefaeembra@mapstodon.space avatar

Virtual graffiti. Stencil-paint map of Edinburgh new town. Using #Qgis, #Gimp and rendered in #Blender.

Using QGIS 'delete holes' gives geometrically valid stencil masks. Gimp's 'Color to grey' gives the sunburst/feather effect.

Used OS OpenZoomStack, crown copyright and database rights.

stevefaeembra, to edinburgh
@stevefaeembra@mapstodon.space avatar

#Edinburgh New Town rendered in an art-deco glass style. Using #qgis and #blender.

Pavements from Edinburgh City Council adopted roads, buildings from Ordnance Survey OpenZoomStack

stevefaeembra, to blender
@stevefaeembra@mapstodon.space avatar

Ink and wash rendering of Wells Cathedral and environs. #Qgis #Blender

Done with a mixture of prewitt filter on normalised depthmap (edge lines) run through a threshold, , mixed with shadows

Vicar's Close, the street north of the cathedral, is pretty interesting

https://en.wikipedia.org/wiki/Vicars%27_Close,_Wells

#Cartography #Mapping

1/2

osgav, to random
@osgav@vis.social avatar

not what i was aiming for, but satisfying nevertheless

would anyone like to venture a guess as to what they're looking at?

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@danielaKay @osgav Thinking the same thing - bus routes in Edinburgh. The 'glitches' are probably lines to the depots, or joining the start and end of each route. Brightness is traffic density?

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@osgav @danielaKay I thought I recognised the neon giraffe (once seen, not unseen 🙂 )

where are you getting this data from, is is OpenStreetMap, Naptan or somewhere else? (If it's OSM i think there's a route field)

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@danielaKay @osgav @blinry

nice! congrats 😀

Does databending count for glitch gallery? (e.g. editing image files as raw sound files in Audacity, then saving back as bmp)

Not done this in years, and forgotten the process, but it's interesting to see echo and delay being applied to photos

Sound and image processing only vary by 1 dimension. There's a big overlap between raster filters and audio filters...

stevefaeembra, to Dragonlance
@stevefaeembra@mapstodon.space avatar

Another cartographic experiment with #Qgis and #Gimp. This time, using repeated applications of GIMP's Photocopy filter to thin out polygons.

I quite like the blobby, cellular look. Looks almost leaf-like.

#Cartography #Map #OpenStreetMap

stevefaeembra, to blender
@stevefaeembra@mapstodon.space avatar

Netherlands has so many interesting town layouts.

Bourtange, on the border with Germany, is an old bastion fort now containing a village.

Using AHN4 for DSM, #Qgis and #Whiteboxtools for masks and rasters, #Blender to render. #Openstreetmap used for masking water and building areas.

https://osm.org/go/0GcWpwtQE-

stevefaeembra,
@stevefaeembra@mapstodon.space avatar

@thilo

ooh nice! Thanks, I might do that one next 🙂 The Netherlands really do have some interesting urban designs. And old bastion forts. So many bastion forts!

I remember seeing an almost square island with one car road round the outside, but all of the internal routes were bike lanes

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