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Jürgen Hubert
@juergen_hubert@mementomori.social  ·  activity timestamp 4 days ago

I am still planning a replacement for my Google MyMaps map of German folk tales, one based on #OpenStreetMap .

Reuirements include:

- I should not be required to host an entire map server.
- I should be able to integrate the maps into #MediaWiki wiki pages via plugins.

Last time I asked this question, I got a couple of good suggestions such as Umap and Leaflet that might fit the bill. However, since then I thought of a further requirement that would be really useful for me:

Filterable tags for markers.

Let me explain: I want to put a bunch of markers on the map, and each refers to a folk tale. And then I want to tag some of them with "dragon", "witch", "treasure" and so forth - and then people should be able to filter them by these tags, so that only those tales that feature "dragons" or whatever on the map.

On the other hand, maybe people want to filter the tales by the book in which they first appeared, such as "Deutsche Sagen" by the Brothers Grimm. However, this means that those tags cannot be mutually exclusive - a tale might either feature a dragon or be from "Deutsche Sagen", it might be both, or neither.

If there is truly no other way of doing this, I might have to do these "filters" as separate maps instead. But I really don't want to do this the hard way unless I absolutely have to. So, can anyone help?

#map #maps #cartography
https://sunkencastles.com/german-folklore-map/
Jürgen Hubert
@juergen_hubert@mementomori.social  ·  activity timestamp 4 days ago

I am still planning a replacement for my Google MyMaps map of German folk tales, one based on #OpenStreetMap .

Reuirements include:

- I should not be required to host an entire map server.
- I should be able to integrate the maps into #MediaWiki wiki pages via plugins.

Last time I asked this question, I got a couple of good suggestions such as Umap and Leaflet that might fit the bill. However, since then I thought of a further requirement that would be really useful for me:

Filterable tags for markers.

Let me explain: I want to put a bunch of markers on the map, and each refers to a folk tale. And then I want to tag some of them with "dragon", "witch", "treasure" and so forth - and then people should be able to filter them by these tags, so that only those tales that feature "dragons" or whatever on the map.

On the other hand, maybe people want to filter the tales by the book in which they first appeared, such as "Deutsche Sagen" by the Brothers Grimm. However, this means that those tags cannot be mutually exclusive - a tale might either feature a dragon or be from "Deutsche Sagen", it might be both, or neither.

If there is truly no other way of doing this, I might have to do these "filters" as separate maps instead. But I really don't want to do this the hard way unless I absolutely have to. So, can anyone help?

#map #maps #cartography
https://sunkencastles.com/german-folklore-map/
Fedi.Garden 🌱
@FediGarden@social.growyourown.services  ·  activity timestamp 2 weeks ago

En.osm.town is an independent Mastodon server for people active in the OpenStreetMap community.

This server has been operating since 2018.

Fediversehttps://en.osm.town

You can find out more at https://en.osm.town/about or contact the admin @compass

cc @openstreetmap

#FeaturedServer#OpenStreetMap#OSM#Geospatial#GIS#Maps#Mapping#Cartography#Mastodon #Fediverse#FreeFediverse
Fedi.Garden 🌱
@FediGarden@social.growyourown.services  ·  activity timestamp 2 weeks ago

En.osm.town is an independent Mastodon server for people active in the OpenStreetMap community.

This server has been operating since 2018.

Fediversehttps://en.osm.town

You can find out more at https://en.osm.town/about or contact the admin @compass

cc @openstreetmap

#FeaturedServer#OpenStreetMap#OSM#Geospatial#GIS#Maps#Mapping#Cartography#Mastodon #Fediverse#FreeFediverse
Claude Trudel
@cltr@jasette.facil.services  ·  activity timestamp 4 weeks ago

Une étude critique de la discipline « Histoire de la cartographie »
🔸 "Le domaine apparemment séculaire de « l'histoire de la cartographie » a été inventé après 1950"
Par Matthew Edney @mhedney
https://brill.com/display/title/73079
#histoire #cartographie #maps #cartography #livre#géographie#étude #essai #recherche#Brill
Deborah Pickett
@futzle@old.mermaid.town  ·  activity timestamp 4 weeks ago

There's been talk on the Fedi about why online maps like OSM and Google use the Mercator projection, and I think it needs a bit of clarification. (Do NOT snitch tag.)

Online maps are mostly used at small scales, of a district or a city. At these scales, the earth is approximately flat, so users expect a map that is conformal, one that preserves angles and shapes.

Online maps are continuously zoomable from continents down to your house. They usually aren't rendered on your browser straight from vectors, but are batch-rendered offline into square tile images. If you're on a slowish Internet connection, you can see them loading individually.

As you zoom an online map, tiles get replaced with higher-resolution ones, and as you scroll, tiles get filled in to fill the gaps. You could theoretically scroll and zoom forever, so the map needs to not have a magically special reference latitude or longitude. These constrains mean that the map needs to be equatorial, so that no point gets special treatment, and cylindrical, so that meridians are vertical and lines of latitude are horizontal.

And which is the map projection that is all of equatorial, cylindrical and conformal? Mercator!

#Maps#Cartography #OpenStreetMap
Deborah Pickett
@futzle@old.mermaid.town  ·  activity timestamp 4 weeks ago

There's been talk on the Fedi about why online maps like OSM and Google use the Mercator projection, and I think it needs a bit of clarification. (Do NOT snitch tag.)

Online maps are mostly used at small scales, of a district or a city. At these scales, the earth is approximately flat, so users expect a map that is conformal, one that preserves angles and shapes.

Online maps are continuously zoomable from continents down to your house. They usually aren't rendered on your browser straight from vectors, but are batch-rendered offline into square tile images. If you're on a slowish Internet connection, you can see them loading individually.

As you zoom an online map, tiles get replaced with higher-resolution ones, and as you scroll, tiles get filled in to fill the gaps. You could theoretically scroll and zoom forever, so the map needs to not have a magically special reference latitude or longitude. These constrains mean that the map needs to be equatorial, so that no point gets special treatment, and cylindrical, so that meridians are vertical and lines of latitude are horizontal.

And which is the map projection that is all of equatorial, cylindrical and conformal? Mercator!

#Maps#Cartography #OpenStreetMap
Deborah Pickett
@futzle@old.mermaid.town replied  ·  activity timestamp 4 weeks ago

Mercator's world map of 1569 was useful to navigators at the time because it is conformal (preserving angles) even over long distances. You could draw a line between source and destination, read off the constant bearing, and point your ship in that direction for days or weeks, and you'd arrive at your destination. This line is called a "rhumb line", or (and I love this word) a "loxodrome".

Rhumb lines are absolutely not the shortest route between two points. That would be a great circle route, but computing a great circle requires spherical trigonometry, which is something that navigators were loath to mess with (as your bearing changes over the course of traversing a great circle, so it requires constant attention). Great circles have certainly been used by navigators for a long time, particularly in aviation where carrying your fuel is a factor. Now of course, ubiquitous computing and GPS makes great circles easy, and rhumb lines are just a historical curiosity.

But because of the properties of Mercator being coincidentally convenient for online maps, we find ourselves back in the 16th Century with a default projection that is frankly bad at large scales.

#Maps#Cartography
Deborah Pickett
@futzle@old.mermaid.town  ·  activity timestamp 4 weeks ago

There's been talk on the Fedi about why online maps like OSM and Google use the Mercator projection, and I think it needs a bit of clarification. (Do NOT snitch tag.)

Online maps are mostly used at small scales, of a district or a city. At these scales, the earth is approximately flat, so users expect a map that is conformal, one that preserves angles and shapes.

Online maps are continuously zoomable from continents down to your house. They usually aren't rendered on your browser straight from vectors, but are batch-rendered offline into square tile images. If you're on a slowish Internet connection, you can see them loading individually.

As you zoom an online map, tiles get replaced with higher-resolution ones, and as you scroll, tiles get filled in to fill the gaps. You could theoretically scroll and zoom forever, so the map needs to not have a magically special reference latitude or longitude. These constrains mean that the map needs to be equatorial, so that no point gets special treatment, and cylindrical, so that meridians are vertical and lines of latitude are horizontal.

And which is the map projection that is all of equatorial, cylindrical and conformal? Mercator!

#Maps#Cartography #OpenStreetMap
Fedi.Garden 🌱
@FediGarden@social.growyourown.services  ·  activity timestamp last month

Mapstodon.space is a Mastodon server for cartography & geospatial professionals and enthusiasts. Ask questions, share your maps, chat around, enjoy the emojis!

Fediversehttps://mapstodon.space

You can find out more at https://mapstodon.space/about or contact the admin @jeremy

cc @geospatial

#FeaturedServer#Maps#Cartography#Geospatial#GIS#Mapping#Cartographers#Mastodon #Fediverse#FreeFediverse
Fedi.Garden 🌱
@FediGarden@social.growyourown.services  ·  activity timestamp last month

Mapstodon.space is a Mastodon server for cartography & geospatial professionals and enthusiasts. Ask questions, share your maps, chat around, enjoy the emojis!

Fediversehttps://mapstodon.space

You can find out more at https://mapstodon.space/about or contact the admin @jeremy

cc @geospatial

#FeaturedServer#Maps#Cartography#Geospatial#GIS#Mapping#Cartographers#Mastodon #Fediverse#FreeFediverse