Round and round

I’m sorry I neglected this blog for the last two months. It wasn’t because I stopped geofiction activities – I just kind of forgot to update anything here. In fact, I’ve been staying busy with various geofiction projects.

I ran across a small, free website that someone made that transforms a flat map of an imaginary planet into a globe that you can rotate with the mouse or that can be used to generate a “spinning world” gif. It’s called maptoglobe.com.

I decided I wanted to make one for my planet, Arhet – just out of curiosity. This did have a few minor technical challenges. First, I had to “knit” together the tile images for Arhet. I found a nice utility that does this, an application called tile-stitch by Eric Fischer. It can be found on github. Except for one small problem, I just followed the documentation provided on the github README. That one problem: to get it to work in my machine, I needed to modify the code in the stitch.c file to include the full path to the geotiff utilities. So…

Original code:...

#include <geotiffio.h>
#include <xtiffio.h>
...

My version:...

#include </usr/include/geotiff/geotiffio.h>
#include </usr/include/geotiff/xtiffio.h>
...

Once that was set up, I simply extracted the tiles at zoom level 5 from the Arhet2-carto render using the tile-stitch utility, with this command
./stitch -o arhet5.png -- -85.05 -179.99 85.05 179.99 5 https://tiles01.rent-a-planet.com/arhet2-carto/{z}/{x}/{y}.png

That got the whole planet into a square .png file, which I called arhet5.png.

The next problem is that the maptoglobe website requires the map image to be in a equirectangular projection. But the tiles for Arhet are in the modified mercator projection used by almost all online “slippy maps,” classified as EPSG:3857.

So the arhet5.png file was in the wrong projection. I found out I could use another utility that I already had, the gdal library, to do this job. I ran the following commands.
/usr/bin/gdal_translate -of Gtiff -co "tfw=yes" -a_ullr -20037508.3427892 20036051.9193368 20037508.3427892 -20036051.9193368 -a_srs "EPSG:3857" "arhet5.png" "arhet5_tfw.tiff"

/usr/bin/gdalwarp -s_srs EPSG:3857 -t_srs EPSG:4326 -ts 6400 3200 "arhet5_tfw.tiff" "arhet5.tif"

These produced a .tif file in the right projection, 6400 x 3200 pixels. I then opened this file and resaved as .png again (because this is a more compact format that is therefore uploadable to maptoglobe.com – which has a maximum file size limit).

I then uploaded that .png file to the maptoglobe site, and it allowed me to save the resulting “globe” – it’s accessible here. Further, I was able to make this nice little spinning planet gif:

That’s the planet Arhet, as it currently stands – note that most of the mapping there is not my own, but the work of the various other Arhet members who have joined me in my experiment.

That worked out so well that I did the same thing for my own private planet, Rahet (note that the names Arhet and Rahet are obviously related; Rahet came first, and when I decided to change the project and invite other participants, I renamed the old Rahet as Arhet, and then resurrected the old Rahet later and as a separate project again).

Here is a the link for Rahet on the maptoglobe site, and here is the spinning planet gif:

So those are pretty cool. Remember that the original “slippy maps” (HRATEs) of these two projects are on the map portion of this website, here and here.

Music to make HRATEs to: 하선호 (Sandy), “Love Me More”

Messing with Maperitive

For a long time I avoided Maperitive – because when I tried it several years ago it repeatedly crashed my computer. So I thought of it as bad software.

Recently, I decided to give it another try. This is in relation to wanting more tools to be able to develop and understand custom renders, related to my efforts to expand functionality on my own map server.

So just this morning I downloaded Maperitive, got a successful install, and played with it a little bit. I made a google maps style view of my city Ohunkagan.

I tried to make a detailed view of the OGF country called Egani (because my efforts with Maperitive just happened to match up with that mapper’s request for some technical help).

That’s a pretty detailed map – you will have to download and zoom around to see the detail.

Maperitive is powerful, but it’s got a pretty steep learning curve too. I’ll mess with it some more, as it appears to have a stable version that runs on Linux, now.

Here is a map of my village of Goodgrove, on Arhet (my own map server).

Music to view maps by: Muse, “Map of the problematique.”

HRATE

In response to several queries from other geoficticians about how to set up a map server (e.g. Arhet or Ogieff), I decided to consolidate some documentation about how I got Arhet to work. It is here:

http://wiki.geofictician.net/wiki/index.php/HRATE

It is very much a work-in-progress. As I think of information to add, or decide to add more detail, I’ll fill it out. At some point, I’ll be trying to do a “re-build” of the Arhet stack to a new server (for reasons related to the fact that I have other things running on its current server that have a higher need for reliability), and when I do that, it will give me a chance to review and better understand the process.

Music to write documentation by: Erik Satie, “Gnossienne No. 1, 2, 3.”

Git topo

I finally got tired of dealing with Windows 10 drama, and decided to rebuild my preferred Ubuntu Linux desktop, as I’d been using in Korea before moving away last July.

I’ve made good progress on that, and have JOSM up and working again, and all that. But I became aware, as I was migrating my data and files, that I have a lot of files I would rather not lose, especially related to my geofiction. I need some systematic means of keeping stuff backed up.

I handled the issue of backup and redundancy for my creative writing years ago, when I started storing all my drafts and notes in google docs. It’s convenient, too, because I can get to my writing no matter where I am.

But I have no such system for all my .osm files for the geofiction. Especially important are the .osm files I use for drawing the topo layer, since those are never uploaded anywhere except temporarily at the time of an update.

I suppose I could just copy the files. But I decided I needed to store them in some kind of version-controlled space. About two years ago, I’d had them in a git repository but it was just copied out to an extra harddrive. I used git for some other stuff I used to do, so it wasn’t that hard to figure out.

I decided this time to try something different – I made a repository on github and decided to put my topo .osm files there. If I get in the habit of regularly updating the git repository, I’ll always have those topo files, no matter what happens to my computer or where I am. Further, if ever I go in the direction of wanting to collaborate on drawing topo files, this will make it really easy (assuming the other person is up to dealing with checking things out of a git repository).

If ever there will be a truly collaborative geofiction “planet” with a master topo layer, this might be a way to maintain that information, since practically speaking it can’t and shouldn’t be uploaded to the map server. Just an experiment, I guess, and meanwhile I’ll have a reliable backup of my work.

Music to map by: 선미, “가시나.

Some weeks…

And then, some weeks, I don’t get much done.

I started working on trying to customize my Rails Port (the main “copy” of the OpenStreetMap slippy map), and got very bogged down in the fact that the OpenStreetMap Rails Port is highly complex software written in a language and using an architecture unfamiliar to me: the infamous “Ruby on Rails.”

I dislike the way that the actual name “OpenStreetMap” is hard-coded throughout all the little modules. It seems like a poor application design practice, especially for an opensource project. One area where the name proliferates is in all the internationalization files. So I started wondering how hard it might be to get all these internationalization files to be more “generic.” The answer: pretty hard, at least for me.

I’ve wandered off down a digressive passage where I’m learning about software internationalization under the Ruby on Rails paradigm, but I’m undecided how I want to handle this. Do I want to try to solve it the “right way”? Or just kludge it (most likely by deleting all the internationalization files except perhaps English, Spanish, and Korean)?

Meanwhile I have also got pulled away by some non-computer, non-geofiction projects.

So… not much to report, this week – nothing mapped, nothing coded, nothing configured.

Music to map by: Sergei Rachmaninoff, “Piano Concerto No. 2.”

A more technical summary of how I built my tileserver – part 2

[Update 20180923: continues from here]

The objective

I started discussing the coastline shapefile problem in first post.

Early on, I found the tool called QGIS Browser and installed it on my desktop. I used this to examine the shapefiles I was creating.

The first step was to look at the “real Earth” OpenStreetMap-provided shapefiles I was trying to emulate – the two mentioned in my previous post:
/openstreetmap-carto/data/land-polygons-split-3857/land_polygons.shp
and
/openstreetmap-carto/data/simplified-land-polygons-complete-3857/simplified_land_polygons.shp

Here are screenshots of each one.

First, land_polygons.shp

And here is simplified_land_polygons.shp

The structure is pretty straightforward, but – how do I make these? Where do they come from? – aside from the non-useful explanation found most places, which is that “OpenStreetMap generates them from the data”.

The coastline problem

The way that the shapefiles are generated for OpenStreetMap are not well documented. But after looking around, I found a tool on github (a software code-sharing site) developed by one of the OpenStreetMap gods, Jochen Topf. It is called osmcoastline, which seemed to be the right way to proceed. I imagined (though I don’t actually know this) that this is what’s being used on the OpenStreetMap website to generate these shapefiles.

The first thing I had to do was get the osmcoastline tool working, which was not trivial, because apparently a lot of its components and prerequisites are not in their most up-to-date or compatible versions in the Ubuntu default repositories.

So for many of the most important parts, I needed to download each chunk of source code and compile them, one by one. Here is the detailed breakdown (in case someone is trying to find how to do this).

Installing osmcoastline

I followed the instructions on the github site (https://github.com/osmcode/osmcoastline), but had to compile my own version of things more than that site implied was necessary. Note that there are other prerequisites not listed below here, like git, which can be gotten via standard repositories, e.g. using apt-get on Ubuntu. What follows took about a day to figure out, with many false starts and incompatible installs, uninstalls, re-installs, as I figured out which things needed up-to-date versions and which could use the repository versions.

I have a directory called src on my user home directory on my server. So first I went there to do all this work.
cd ~/src

I added these utilities:
sudo apt-get install libboost-program-options-dev libboost-dev libprotobuf-dev protobuf-compiler libosmpbf-dev zlib1g-dev libexpat1-dev cmake libutfcpp-dev zlib1g-dev libgdal1-dev libgeos-dev sqlite3 pandoc

I got the most up-to-date version of libosmium (which did not require compile because it’s just a collections of headers):
git clone https://github.com/osmcode/libosmium.git

Then I had to install protozero (and the repository version seemed incompatible, so I had to go back, uninstall, and compile my own, like this):

Git the files…
git clone https://github.com/mapbox/protozero.git
Then compile it…
cd protozero
mkdir build
cd build
cmake ..
make
ctest
sudo make install

I had to do the same for the osmium toolset:

Git the files…
git clone https://github.com/osmcode/osmium-tool.git
Then compile it…
cd osmium-tool
mkdir build
cd build
cmake ..
make

That takes care of the prerequisites. Installing in the tool itself is the same process, though:

Git the files…
git clone https://github.com/osmcode/osmcoastline.git
Then compile it…
cd osmcoastline
mkdir build
cd build
cmake ..
make

I had to test the osmcoastline tool:
./runtest.sh

Using osmcoastline for OGF data

So now I had to try it out. Bear in mind that each command line below took several hours (even days!) of trial and error before I figured out what I was doing. So what you see looks simple, but it took me a long time to figure out. In each case, after making the shapefile, I would copy it over to my desktop and look at it, using the QGIS browser tool. This helped me get an in intuitive, visual feel of what it was I was creating, and helped me understand the processes better. I’ll put in screenshots of the resulting QGIS Browser shapefile preview.

To start out, I decided to use the OGF (OpenGeofiction) planet file. This was because the shapefiles were clearly being successfully generated on the site, but I didn’t have access to them – so it seemed the right level of challenge to try to replicate the process. It took me a few days to figure it out. Here’s what I found.

Just running the osmcoastline tool in what you might call “regular” mode (but with the right projection!) got me a set of files that looked right. Here’s the command line invocation I used:
YOUR-PATH/src/osmcoastline/build/src/osmcoastline --verbose --srs=3857 --overwrite --output-lines --output-polygons=both --output-rings --output-database "YOUR-PATH/data/ogf-coastlines-split.db" "YOUR-PATH/data/ogf-planet.osm.pbf"

Then you turn the mini self-contained database file into a shapefile set using a utility called ogr2ogr (I guess part of osmium?):
ogr2ogr -f "ESRI Shapefile" land_polygons.shp ogf-coastlines-split.db land_polygons

This gives a set of four files
land_polygons.dbf
land_polygons.prj
land_polygons.shp
land_polygons.shx

Here is a view of the .shp file in the QGIS Browser. Looks good.

I copied these files into the /openstreetmap-carto/data/land-polygons-split-3857/ directory, and I tried to run renderd. This alone doesn’t show the expected “ghost” of the OGF continenents, though. Clearly the simplified_land_polygons.shp are also needed.

So now I experimented, and finally got something “simplified” by running the following command line invocation (note setting of –max-points=0, which apparently prevents the fractal-like subdivision of complex shapes – technically this is not really “simplified” but the end result seemed to satisfy the osm-carto requirements):
YOUR-PATH/src/osmcoastline/build/src/osmcoastline --verbose --srs=3857 --overwrite --output-lines --output-rings --max-points=0 --output-database "YOUR-PATH/data/ogf-coastlines-unsplit.db" "YOUR-PATH/data/ogf-planet.osm.pbf"

Again, make the database file into shapefiles:
ogr2ogr -f "ESRI Shapefile" simplified_land_polygons.shp ogf-coastlines-unsplit.db land_polygons

This gives another set of four files
simplified_land_polygons.dbf
simplified_land_polygons.prj
simplified_land_polygons.shp
simplified_land_polygons.shx

And this .shp looks like this:

Now when I copied these files to the /openstreetmap-carto/data/simplified-land-polygons-complete-3857/ directory, and re-ran renderd, I got a successful ghosting of the continents in the render (no screenshot, sorry, I forgot to take one).

Using osmcoastline for my own data

Now I simply repeated the above, in every respect, but substituing my own rahet-planet.osm.pbf file for the ogf-planet.osm.pbf file above. I got the following shapefiles:

land_polygons.shp

simplified_land_polygons.shp

And these, copied to the appropriate osm-carto data directory locations, gives me the beautiful render you see now. [EDIT: Note that the view below of the Rahet planet is “live”, and therefore doesn’t match what shows in the screenshots above. I have moved in a different concept with my planet, and thus I have erased most of the continents.]

I actually suspect this way that I did it is not the completely “right” way to do things. My main objective was to give the osm-carto shapefiles it would find satisfactory – it was not to try to reverse-engineer the actual OSM or OGF “coastline” processes.

There may be something kludgey about using the output of the second coastline run in the above two instances as the “simplified” shapefile, and this kludge might break if the Rahet or OGF planet coastlines were more complex, as they are for “Real Earth.” But I’ll save that problem for a future day.

A more immediate shapefile-based project would be to build north and south pole icecaps for Rahet, in parallel with the “Real Earth” Antarctic icesheets that I disabled for the current set-up. You can see where the icecaps belong – they are both sea-basins for the planet Rahet, but they are filled with glacial ice, cf. Antarctica’s probably below-sea-level central basin. And the planet Mahhal (my other planet) will require immense ice caps on both poles, down to about 45° latitude, since the planet is much colder than Earth or Rahet (tropical Mahhal has a climate similar to Alaska or Norway).

Happy mapping.

Music to map by: Café Tacuba, “El Borrego.”

Progress Made!

[Update 20180923: continued from here]

The OSM “Rails Port” is now running on my server, and I have successfully connected to the api via JOSM and rebuilt my test-version of my planet, Rahet.

It took me an entire week of googling and meditating before I solved the port problem. Ultimately, I was looking in the wrong place for clear documentation about it – I was hoping someone would write about it from the perspective of Rails, but finally I found the documentation that made it possible on the Passenger website, buried in an example. There’s a line that belongs in the apache config file, “PassengerRuby /usr/bin/ruby2.3” (or whatever version).

And that made all the difference.

Here’s the link: MAP.

So now you can look around. It’s just the “out-of-the-box” OpenStreetMap website (AKA Rails Port), with some minimal customization where I could find where to do it easily. I’ll continue working on that. I might actually disable the iD and Potlatch editing tools – I always use JOSM, and if it ever reaches a point where I’m allowing or inviting others to edit, I would make JOSM-use a prerequisite, I’m certain. JOSM, with its steep learning curve, seems like it would be a good way to “filter” people on the question of how serious they’re taking a project.

There are a number of features that don’t work. I would like to figure out a way to disable the user sign-up page. That’s a kind of vulnerability for the types of use I’m intending for this set-up. Meanwhile, I’ve disabled in a rather inelegant way by “breaking” the sign-up page (by changing its name inside the appropriate folder on the app/views/user path).

I’m happy.

I’ll write up how I figured out the coastline problem, tomorrow, and begin working on deciding what features to retain versus which to change in the Rails Port (i.e. think about customization).

[Update 20180923: continues here]

Music to map by: Run The Jewels, “Talk To Me.”

Not making progress

I wanted to post a part 2 for my last post, about how I got the tileserver working. I was going to talk about coastlines. In fact, my tileserver IS working, but it feels a bit useless without the other half: the so-called Rails Port.

So I have become obsessed with trying to get the Rails Port running. And I keep running into problems. The fundamental problem is that I have never used Ruby (and/or “Ruby on Rails”) before. I don’t really understand it. It’s not a development environment I have any comfort with at all. I don’t really even get the overall model.

I can get a local version of the generic “openstreetmap-website” code running on port 3000 on my desktop. And I can get a similar “development” version running on my server. But I don’t know all the places I need to edit to get the Rails Port to “look at” my tile server and not the default OSM tileservers. And I don’t know what other files I need to customize to control e.g. users, site security, name presentation, etc.

I think I’m going to have to take a timeout on trying to set this up, and spend some time learning how to deploy a much simpler Ruby app on my server.

One bit that seems like it should be utterly trivial is how to get the application to present on port 80 (standard webpage) instead of port 3000 (Ruby’s default development port, I guess). I have installed Passenger for Apache and that’s how I can present the application on port 3000, but I guess Rails doesn’t cohabit well with other applications on Apache – e.g. the wiki, this blog, etc. So somehow… it has to get “wrapped” or “proxied” but the details of how to configure this are beyond my expertise.

I’m frustrated, so I’m going to take a break from this server stuff.

Music to map by: 박경애 – 곡예사의 첫사랑

A more technical summary of how I built my tileserver – part 1

I thought I should put a discussion of how I did this, with much more detail, as I am sure there are other people out there in the world who might want to do something similar.

This is part 1. I’ll post part 2 later.

Background

I wanted to be able to serve Openstreetmap-style map tiles of my own fictional planet, in the same way that the site OpenGeofiction does, but using my own data set.

This process of building a tileserver is separate from the job of setting up an Openstreetmap-style apidb database to be able to edit the data set using tools such as iD, Potlatch, or JOSM. I’m still working on that.

Platform and Preliminaries

I deliberately set up my server on Ubuntu 16.04 (a flavor of Debian Linux) because I knew that OpenGeofiction runs in this environment. I’m not actually sure, but I assume Openstreetmap does too, though, given its scale, that may not be exactly the case, anymore – more likely it’s got a kind of customized, clustered Linux fork that has some genetic relationship to Ubuntu.

I thought it would therefore be easier to replicate the OpenGeofiction application stack.

Before starting this work, I had already installed MySQL and Apache and Mediawiki – except for Apache, however, these are not relevant to setting up a tileserver.

I had also already set up PostgreSQL (the preferred Openstreetmap database server), so the preliminary mentions of setting up this application were skipped.

Finally, using Apache’s sites-available config files and DNS, I had set up a subdomain on my server, tile.geofictician.net, to be the “outside address” for my tileserver. This will hopefully mean that if I ever decide to separate my tileserver from other things running on the same server, it will be somewhat easier to do.

S2OMBaTS with Deviations

Starting out, I mostly followed the steps and documentation at switch2osm.org’s detailed tutorial, here. Below, I refer to this page as S2OMBaTS (“switch2osm manually building a tile server”).

So I don’t see any need to repeat everything it says there. I just followed the steps given on that webpage exactly and religiously. What I’ll document are only the spots where I had to do something differently. These are my “deviations.”

  1. Where S2OMBaTS suggests creating a ‘renderaccount’ on the server to own all the tileserver-related directories and tools, I used my non-root regular username. I’m not sure this is good practice, and if I were setting something up as a “production” environment, I’d be more careful to segregate ownership of this collection of files, applications and services.
  2. There are some problems with authenticating a non-root user for PostgresSQL (‘root’ being the infamous ‘postgres’ superuser). I had to edit the /etc/postgresql/9.5/main/pg_hba.conf file so that the authentication method was “trust”[css]
    # Database administrative login by Unix domain socket
    local all postgres trust

    # TYPE DATABASE USER ADDRESS METHOD

    # “local” is for Unix domain socket connections only
    local all all trust
    [/css]

    I think this might be a bad solution from a security standpoint, but it’s the only one I could find that I understood and could get to work. PostgreSQL security is weird, to me. My DBA experience was entirely with SQLServer and Oracle, back in the day, and those databases’ security are integrated to OS security more tightly, I think. Similarly, MySQL seems to assume linkages between system users and database users, so security for the matched pairs of users are linked. But it seems like PostgreSQL doesn’t work that way.

  3. Where S2OMBaTS suggests using the URI=/hot/ in the /usr/local/etc/renderd.conf file (which seems intended to hijack other applications’ support for the already-existing “HOT” – Humanitarian Openstreetmap Team – layer). I used URI=/h/ instead, which was entirely arbitrary and I could just as easily have used something more meaningful, as at OpenGeofiction, with e.g. URI=/osmcarto/.
  4. To test my installation, of course, I had to load some test data. S2OMBaTS uses a geofabrik snapshot of Azerbaijan. I decided just for the sake of familiarity, to use a snapshot of South Korea. I had to spend quite a bit of time researching and tweaking the individual osm2pgsql options (parameters) to get it to run on my itty-bitty server, even for a fairly small dataset like South Korea’s OSM snapshot, so here’s the osm2pgsql invokation I used to load the data (YMMV).
    osm2pgsql --database gis --create --slim  --multi-geometry --keep-coastlines --hstore --verbose --tag-transform-script ~/src/openstreetmap-carto/openstreetmap-carto.lua --cache 2500 --cache-strategy optimized --number-processes 1 --style ~/src/openstreetmap-carto/openstreetmap-carto.style ~/data/south-korea-latest.osm.pbf
    

At this point, I reached the end of the S2OMBaTS tutorial.

Loading my own planet

I then had to customize things to load my own planet instead of a largely “naked earth” with South Korea well-mapped. The first step was easy enough. I just replaced the South Korea pbf extract with a pbf of my own planet, and re-ran the osm2pgsql step. I got the pbf extract of my planet by working with some kludges and with JOSM on my desktop machine. It was a “simplified” planet – just the continent outlines, a few cities, two countries with their admin_level=2 boundaries, and one tiny outlying island with lots of detail, which I borrowed from my city-state Tárrases at OpenGeofiction. It was composed as a kind of “test-planet” to keep things simple but hopefully test most of what I wanted to achieve in my tileserver.

Here’s the load script for that (essentially the same as used for South Korea, above).

osm2pgsql --database gis --create --slim  --multi-geometry --keep-coastlines --hstore --verbose --tag-transform-script ~/src/openstreetmap-carto/openstreetmap-carto.lua --cache 2500 --cache-strategy optimized --number-processes 1 --style ~/src/openstreetmap-carto/openstreetmap-carto.style ~/data/gf-planet.osm.pbf

The problem, of course, is that if you run the render at this point, you get all the features of the new planet, but the continent outlines and the land-water distinction is “inherited” from earth. That’s because the mapnik style being used is referencing the shapefiles produced by and downloaded from Openstreetmap. The creators of the Openstreetmap software, including the OSM carto style, didn’t take into account the possibility that someone would try to use their software to show a map of somewhere that wasn’t planet Earth, and consequently, these need for these shapefiles is “hardcoded.” So the “Earth” shapefiles have to be substituted by alternate shapefiles extracted from the alternate planet dataset.

Customizing Coastlines and Shapefile Hell

This was the hardest part for me. It took me more than a week to figure it all out. I’m not experienced with shapefiles, and don’t really understand them, and the process by which shapefiles get extracted from the OSM global dataset in a format that can be used by the openstreetmap-carto mapnik style is very poorly documented, online. So it was a lot of google-fu and experimentation, and downloading QGIS and teaching myself a bit about shapefiles, before I could get things working. It’s not clear to me that I really did it the right way. All I can say is that it seems to work.

The first steps I took were to try to simplify my task. I did this by chasing down the shapefile dependencies in the mapnik style sheet, and manually removing the ones that seemed less important. I did this mostly through trial and error.

The only file that needs to be edited to accomplish this simplification is the main mapnik xml file: <YOUR-PATH>/openstreetmap-carto/mapnik.xml. Bear in mind, though, that this file is the output of the carto engine (or whatever it’s called). By editing it, I have “broken” it – I won’t be able to upgrade my OSM carto style easily. But this is just a test run, right? I just wanted to get it to work.

So I edited the <YOUR-PATH>/openstreetmap-carto/mapnik.xml file and deleted some stuff. You have to be comfortable just going in and hacking around the giant xml file – just remember to only delete things at the same branch level of the tree structure so you don’t end up breaking the tree.

I removed the <Style></Style> sections that mentioned Antarctic icesheets – there were two. As things stand, my planet has no Antarctic icesheets, so why try to incorporate shapefiles supporting them?

Then, I eliminated the<Style></Style> section mentioning the <YOUR-PATH>/openstreetmap-carto/data/ne_110m_admin_0_boundary_lines_land directory, since these are land-boundaries for Earthly nations. I figured if I couldn’t see land-boundaries for my planet’s nations at low zooms, it would be no big deal. It’s not clear to me that this has been implemented on OpenGeofiction, either.

I also discovered that in fact, this file doesn’t even point to the <YOUR-PATH>/openstreetmap-carto/data/world_boundaries directory. So there was no need to worry about that one.

So that left me with two shapefiles I had to recreate for my own planet’s data:
<YOUR-PATH>/openstreetmap-carto/data/land-polygons-split-3857/land_polygons.shp and <YOUR-PATH>/openstreetmap-carto/data/simplified-land-polygons-complete-3857/simplified_land_polygons.shp.

Let’s just summarize by saying that this is what took so long. I had to figure out how to create shapefiles that the mapnik style would know what to do with, so that my continents would appear on the render. It took a lot of trial and error, but I’ll document what’s working for me, so far.

*** To be continued ***

[Update 20180923: Continues here]

Music to map by: Héctor Acosta, “Tu Veneno.”

Testing the leaflet widget on the blog

Here’s a live leaflet of my own tileserver with my own planet (stripped of detail because I want my database small as I test things). Welcome to Rahet. UPDATE, OCTOBER 2019: Being a dynamic window on the map, rather than a snapshot, means that since the “planet” shown is much changed, this view is not the view that existed when this blog post was written.

Here’s a view of Tárrases over at OGF on standard layer.

Here’s a view of Tárrases over at OGF on Topo layer.

That’s pretty cool.

Music to map by: Cold, “Bleed.”