MBTile Topo IGN
Bonjour,
Les opportunités de l'Open Sources (Données & Outils)..
MBTile Topo IGN:
- BDTopo (Marne dans ce cas) Décembre 2024
- Relief LIDAR IGN 2024
Commence a peine a flouter a 0.3m par pixel (Z12 a Z18)
Outil QGIS
Plus a jour difficile..
Cdlt
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Hi, this looks usable even for me as a hiker. But what I'm missing is some explanations how to create.
My personal experiences with Twonav and mbtiles are ... lets face it ... sobering.
Missing zoom layers in maps are resulting in white tiles, missing support for Android, huge filesize. Better create rmaps and combine them via imp files.
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Hello,
I usually make and use MBTile Sqlite designed via MOBAC in my GPS (Land mainly uses ONLINE maps). These tiles are in Z10, 12, 14 and 16 zoom and it works well in the GPS I have not noticed any malfunction. I no longer use the Rmap format for my GPS.
The need is to have, for a project that should come to fruition this year, a map on the Eiffel Park (I think you know it) it is a route over several days that travels through three countries: Belgium, Germany and Luxembourg.
If I use MOBAC, to create the tiles, inevitably at the border crossings there are white bands, because the maps overlap, but part of the circuit travels on the border before entering the country over a significant distance. So a few kilometers on a white map.
Looking for solutions There are:
- Open Street Map, import BBBike converted to Vmap plus a customized aspect (Land 8.9.2!)
- QGIS which allows you to create MBTiles tiles, without white stripes.
Resources offered by QGIS:
- First observation: It is easier in QGIS to install ON Line maps, than in Land or MOBAC, because you just have to put the address of the WMS service in a new layer (no script),
- Second observation: For these three countries there is an open source WMS resource;
- Third observation/ Thanks or because of our Belgian friends the maps plug in like the pieces of a puzzle, the white stripe disappears.
The map of each country is on a different layer
- Fourth observation: Qgis manages DEMs in open source, generates curves and shading
- Fifth observation: QGIS allows you to create MBTILES tiles, compatible with Land and TwoNav GPS and to merge these tiles into a hyper map.
Based on this observation, I have two solutions to create two maps, a Vmap and a Hyper Map of MBTiles that cover my route without white areas. The final choice will be made when leaving.
On the design aspect of MBTiles, everything is done with QGIS, Vmap by Land 8.
In the case of MBTiles, it is from Z12 to Z17 in 150 Dpi, so relatively large tiles. Without the default of the one you mention.
Given the volume of each map tile, you have to limit yourself to tiles with a surface area of 10 x 10 km, and limit the number for each hyper map. A hyper map per day works well, and is easy to use. Otherwise I see that we are beyond the physical capabilities of Land.
The case illustrated above is a little different, it has been the subject of two iterations because it is transposable everywhere on the planet, whatever the country:
- IGN France & some enthusiasts (from Africa) have developed the idea of producing a map with the visual aspect of the IGN FRANCE map (which is very popular) for all countries in the world, and in particular in Africa (initial idea).
- Indirectly, but in the development of this idea, there is a collection of small Qgis project files to import. Which gives an empty basic project that can be named after the future map.
Once this project is open and named the future map in QGIS, you just have to import the data which is done relatively easily in QGIS:
- Either from OSM (Quick OSM Queries)
- Or (for France) IGN France databases which are open source. To be seen in each country
- Then we assign the imported data to the project items to the data. (Example Highways to Transport).
Qgis will allow:
- to import the DEM of the country (It is open source in several European countries including Lidar data or on specialized sites in less precise for other countries),
- To create the curves
- To create 'shading.
All that remains is to check / uncheck the layers and export to MBTile.
As long as the MBTile (As with MOBac) remains reasonable in surface and computer volume...
Goods New MBTILES Map with Qgis
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Thanks, that was an helpful explanation. Saved it for future attemps to work with mbtiles.
Regarding your project, as you probably know, Germany has some nice rastermap online, for instance here:
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Regarding white tiles on overlapping rmaps at borders:
I solved this for me with selecting the white color and saving it as transparent color. There is a small program (Copi) that gives the exact colors back (https://www.melk.de/melk_software.htm). In addition to that I play with the transparency of the different maps to finetune the map collection.
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Hello,
Thanks
A view of the tile (MBTile) obtained via QGIS (Z12/Z17) and displayed in Land 10.3.2 on the passage through the three borders. A 4m / pixel view in order to have a view of part of the route on the three countries. The final result is satisfactory at high Zoom there is no white area it is the result of the superposition by layer (See the image).
Usual mountain bike map scale (1.5 to 0.6 m/pixel) the image is correct without blurring and without white area on the border.
Qgis allows you to overlay maps by layers, add relief curves with altitude labels (here it is the Walloon Lidar DEM 1 m x 1m from 2020), add shading to highlight the relief. In the event of a gap in one of the RASTER maps on the presence of trails for example, this gap can be filled either by drawing the missing trail or by adding a layer from Open Street Map, which allows you to obtain a uniform final map as needed.
Qgis is a Swiss army knife with a multitude of blades. Which is confusing at first contact, but once the effort of getting started is done...
Since in Europe the online WMS/WMTS service of ON LINE maps is becoming widespread as well as the online availability of precise DEMs, QGIS is becoming the reference cartographic tool for making a map whatever the final medium (Paper, GPS, SmartPhone).
Thanks for the links.
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What a clown, that Thierry! Not so long ago, he challenged me to create raster MBTiles with QGIS (even though, in my opinion, it’s not the ideal tool for the job). I showed him, step by step, how to proceed. Faced with the evidence and his own embarrassment, he ended up deleting the thread and his messages, even going so far as to claim that QGIS is only a tool for making online maps. And today, here he is again, trying to explain how to do it — yet another example of his legendary bad faith!
https://support.twonav.com/hc/fr/community/posts/10703069667356-R%C3%A9aliser-une-carte-pour-GPS-Twonav-%C3%A0-partir-de-Qgis-%C3%A0-la-demande-sp%C3%A9cifique-de-ThierryWhether it’s from the BD TOPO dataset, contour lines generated from Lidar data, or streams available in vector format, producing raster MBTiles from vector data isn’t optimal. The vector MBTiles format has several advantages over the raster format: it’s lighter, allows on-demand rendering with text oriented in the direction of travel, enables the symbology to be modified on the fly using rules, remains sharp even at zoom levels higher than it was designed for, and much more.
However, Twonav has only made its GPS devices compatible with raster MBTiles, not with the vector format. Still, it’s better than nothing.
I’ll say it again: if Twonav made its GPS devices compatible with the vector MBTiles or PMTiles formats and their associated styles, it would solve the huge rendering issues with native vector maps in the MPVF format. The company would truly stand out from its competitors. Imagine, for example, a Utagawa vector map tailored for Twonav!
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