[Qgis-user] offline basemap in Qfield

Simon Dietmann dietmann at pgnu.de
Mon Oct 14 07:39:55 PDT 2024 

Hi Michaela,

the easiest and most flexible way to achieve this is to generate an offline map either by exporting an online layer to a local .tif or jpg. or by using the basemap function of the qfield export plugin, where you can define e.g. a map theme and the horizontal resolution that is used for creating it. Don´t forget to build pyramids for the raster, otherwise the project won´t run very smooth when you zoom in or out.

Having done this, you can work completely offline in the field and yet use GPS for positioning.

Theres a wide number of sources for maps you can use, some examples:


  *   Topo maps for Germany: TopPlus Open WMS
  *   different sources in the Bundesländer, e.g in Hessen DOP and DGM for download or as WMS
  *   OSM
  *   Wikimaps
  *   GMaps, BingMaps,…

If you need addresses, I can probably help you.

If you need high resolution basemaps in a very large area, I would recommend to split it into several sub-maps and, if needed, add a map with coarse resolution for overview.

Hope this helps, regards,

Simon


Von: QGIS-User <qgis-user-bounces at lists.osgeo.org> Im Auftrag von Roland Berger via QGIS-User
Gesendet: Montag, 14. Oktober 2024 16:16
An: qgis-user at lists.osgeo.org
Betreff: Re: [Qgis-user] offline basemap in Qfield

There is also the concept of "Shared local datasets": https://docs.qfield.org/how-to/outside-layers/?h=local<https://atpscan.global.hornetsecurity.com?d=hrmSVDgOM6CEPOo_9yBWEDwOCGDilU1jEnHytK7A07E&f=UQdttyxvuvBO5EYkbRKT7ymkUhU9R4wiPoT4keSO7ik&i=&k=7DrP&m=lDTaM3AdwdTEQjyNlHY079dnXfXEiEUvPmC-shMy_b4n9MzGwfJflo1mMreGFojnm-EWuzUzynlhfvs6FLVwZmwj8L6Ffa5eiYce-RyGaZHMG4utFtPL2JWqCrlwQJAu&n=H5QZnMR0jSUJMu4Nyex9p68a1WKb57nIKn65_j0g6zPkVGlRr7f2osfjr41ncOiA&r=xs7V5pvOZ3eBMfZibDUFlcam7_uwbCGjAtIZ24mPjpZfUHuf0mC2h4KTYz1bbsa6&s=939424bc87ad8964d09043a58af67217915c7d221fb18d43317db6c29a54c7e2&u=https%3A%2F%2Fdocs.qfield.org%2Fhow-to%2Foutside-layers%2F%3Fh%3Dlocal>
It is useful if you need the same dataset (orthophoto/basemap) in different projects.

Kind regards
Roland
On 10/14/24 16:00, Saber Razmjooei via QGIS-User wrote:
If you use www.merginmaps.com<http://atpscan.global.hornetsecurity.com?d=XH-RE2rj3x7sAxa9dvs5IRSZq1h5R1gUDtw-PBB8EuQ&f=Xtd7iRHG4aKTFugXhf4CB_KS-kwdTzmduLh8ETe7kVU&i=&k=f8Az&m=202Mq3BFUhEq2-n_cKrWbdOPgZXl5yTcLoe6AWOIh1LBi05XstY3d8qjd-ClwFn1Ti7yS2Z1l4QYCOfoEs4-4bWdSFFIGV-VsWoT40X4PVTxX8VfYxDVV9jOTuUTgzZ2&n=62joUSWyQZIi1GLZy4Bf81l_Cu4PpjoMA2ZTXgBmpjNU73_Ipe6OZNRXSGdBGKVk&r=jtPm5NFd8SOgDE6FQhSm4_ke797NXhSM-VWUPRwzSFQs-2_LiJEXepe_Gpw4-JzN&s=08c8c420cc8c4a42cc1572765eea3ae54bd716e8b2173cd1d2d6abc3f0d99d84&u=http%3A%2F%2Fwww.merginmaps.com> QGIS plugin, it will allow you to download our own vector tiles generated from OpenStreetMaps using OpenMapTiles schema for offline usage.

Kind regards
Saber


On Mon, 14 Oct 2024 at 14:59, Greg Troxel via QGIS-User <qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>> wrote:
"Huesmann, Michaela via QGIS-User" <qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>> writes:

> I would like to record data with Qfield using my Android mobile
> phone. In order not to use too much data volume, the base maps should
> be downloaded via WiFi beforehand so that they can be used offline
> outside. However, GPS must be used for orientation during the mobile
> recording process. My questions about this:
> 1. Which map material for Germany can be used offline as  base map in my qfield project and how can I download it?
> 2. How do I ensure that the offline maps are used outside and that no download takes place while I navigate with GPS?

You didn't explain

  - How much data is too much?

  - What happens in terms of data if you just use an OSM mapnik basemap
    + in particualr, what if you open qfield on wifi and pan around to
      all the places you are going to be, to cause it to fetch data.
      Note that OSM requires that users of its tile service cache data
      for a reasonable period of time (7 days?), and thus QField should
      be caching.

  - What size area you are operating in?

I mean to ask "are you really sure you have a problem that needs
solving?"

It is straigthforward to make a raster image of a small area and use
that via "copy" in the now-oddly-named "cable" export.  (I use nextcloud
to exchange bits, not an actual cable...)

Making something that can cover a larger area at varying resolution
probably involves some sort of tiles-in-sqlite format.

In general, the only map data that I'm aware of with licensing that
permits this sort of use is OpenStreetMap, and in the US, government
data from the federal government and a number of states.  (I have no
knowledge.de<http://atpscan.global.hornetsecurity.com?d=pIPjNNVOs6C9fq6P6S8wuYurWamtdwRygExZwB_hgac&f=mO3ki1Cxy9XHuWAZ-kr8UCB091mguKirWIdeW8lIfGA&i=&k=V58Y&m=Na_dOt_QFcmbIVkHI4WCFoLiyYevPSUzwcxslLSzdMZH6RRhDAl1Q8lYoJNmnGuG6d6-KDmATBtEbuFiaWvT-QiPbleE4R3hXRKDFpZe8U7cEwCXg7bWWpM84-H9Hele&n=lp4BeqX9p3xc69gBkFPtwixkI4pmZX7KmW2BqvttTg7GGHOeyS-cE4bnGuODa4oD&r=yBlLaD0_KHDu4VsqJeVruHXQWxo5mZnwswJ7A8a796MfGhjDCArv2gaiRJKq5qAV&s=e32525a0249df88a0657baf300e9e22e218650163dc2a48cdf6930b9aaae69d5&u=http%3A%2F%2Fknowledge.de>, but I'd expect similar -- OSM and maybe government.)
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