[Qgis-user] Google with OTF - as XML

[Lene Fischer]

Hi Andreas, Nyall and Paolo,
I´m well aware of all these incidents. I just had a urgent need for getting the newest Ortophoto for a specific area. And Google did have one from summer 2015. My drone recording went wrong and I had a deadline. So Google saved my day. The print scale was 1:2000 and was OK.
My drone ortho is normally much better ☺  - 2 cm pixel gives a brilliant map.

But still the OpenLayer Plugin give me a lot of trouble…. CRS and OTF crash.
Regards
Lene


Fra: Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org] På vegne af Andreas Neumann
Sendt: 20. december 2015 09:19
Til: qgis-user at lists.osgeo.org
Emne: Re: [Qgis-user] Google with OTF - as XML

Hi,

From a technical point of view it seems to work. But as Nyall said, you are not allowed to use Google tiles directly and print out your own layers on top of it. For that reason we can't add any Google layers to QGIS - officially.

I tried it out - for aerial images the reprojection works fine (if one also uses bilinear/cubic/average interpolation) - but the maps with lineart and labels look really, really ugly after they had been reprojected.

If you print out at high resolution - again the aerial images look fine, but the higher you increase the resolution, the thinner the road symbology gets and the roads get labeled way too often - so not very pretty from a (carto)-graphical point of view. I was impressed though that you can also print at very large sizes (I tested an A0 map wirh my layers and Google images in the backdrop - it took very long to render, but it worked). If you use this too often, there is also the risk that Google blocks your IP address.

The Swiss OSM association offers tiles in the native Swiss projection. This allows to print much nicer maps than with Google maps. See http://sosm.ch/swiss-lv95-projected-tiles/ and you can use the attached xml file to open as a raster image. I think it would be a good idea if other national OSM associations would offer their data in the native national coordinate system. Something to discuss with your local OSM gurus ...

The nice thing about this tile-map GDAL provider is that you can manipulate the raster on the fly (e.g. convert it to black and white, make it darker or lighter, change contrast or colors globally, etc.)

Andreas
On 20.12.2015 00:34, Lene Fischer wrote:

Hi,

Just got a small Christmas present from my husband. 6 XML files  :-)



Containing Google and Streetview. And then you might say 'Yeah we already got that in OpenLayer Plugin' - Correct. But when I use OpenLayer, the vector layers always fly around and calculations mess up.



So now I got the XML files.

Renamed to Zip and Unzipped the files. Open as Raster.

They are now changed in the 'On The Fly' - in any CRS I want.



Now I´m looking forward to my real Christmas Present - Hope Bo read this mail so he don´t forget  ;-)



Regards

Lene Fischer






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