On the fly projection and CRS in QGIS 3 - basemaps and layers | burdGIS

In this video we look at on the fly projection (OTF) in QGIS 3. Some of the settings and the effect they have are explored and we'll look at basemaps and shapefiles with different datums. Sounds like fun right?
I'm also still unsure as to why Q doesn't ask for a choice of transformation when the BNG file is brought in during the second part of the the video. If you can let me know the reason in the comments below I'll send you a burdGIS USB stick!!! (They're super sought after... ;-) )
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[@kaitlyn1603]

Very clear and informative. Thank you for the video!

[@burdGIS]

Thanks for watching Kaitlyn :-)

[@burdGIS]

Are you just getting started with #GIS and #QGIS? This online course will teach you the basics and then you can come back to the #burdGIS channel to improve your skills! :) www.udemy.com/course/an-introduction-to-gis-and-qgis/?referralCode=E39701D884A9EB2B5831

[@federicoascolani6457]

Good video, very usefull.

[@burdGIS]

Glad it helped Federico 😀

[@cjw6659]

great vid

[@burdGIS]

Thanks Craig :)

[@sjwo12344321]

I need some help with geo referencing a large tiff file - I can’t seem to get it to align correctly with the base map / kmz boundary I’m working with. I’ve tried changing the coordinate systems for various layers, the project etc I’m stuck

[@burdGIS]

Can you share the large tiff file or explain what you have tried so far or send screenshots?

[@francescofrau6162]

Great video! I was just wondering if there’s a way to reproject the bing map you used into a seamless and edgeless map, so that it would be possible to have a complete view of the Pacific Ocean.

[@burdGIS]

Hey Francesco, have you tried changing the project CRS to EPSG:3832?

[@francescofrau6162]

@@burdGIS Thank you so much for answer and sorry for my late reply. I tried to change it and it indeed centres the map on the pacific region although I'm not sure why is not as stable as EPSG:3857 and it keeps blanking in and out whenever I just touch the mouse. Do you think there's a way to keep the EPSG:3857 coordinates system and reflect the map at the side of the already existing one? So to have two projections of the same map but mirrored. Sorry for the lengthy question!

[@burdGIS]

The xyz maps are set up to work with 3857 so QGIS has to work pretty hard under the hood to reproject it every time you scroll (and it has to redraw). It would be great if you could just change the central meridian of an existing CRS but I'm not sure how to do that in Q other than creating a custom projection. A custom projection however, would likely cause the same problem with redrawing.

[@francescofrau6162]

@@burdGIS Thank you for your answer. I see I guess I’ll have to work with 3857 for the time being then. I’ll try to look up for a method to change the meridian🙌

[@burdGIS]

Let me know what you find Francesco. It's been requested as a feature looking at github issues: github.com/qgis/QGIS/issues/37274

[@amideabdul6109]

i have a question, when a add a string layer in my qgis over a map satellit, it presents diferents cordenates, help me plz

[@burdGIS]

Thanks amide. Please could you describe what you mean by a string layer? I am not familiar with the term?

[@pavelbukhteev9062]

Hey, thanks for the video! Can I ask you a question: is it possible to work in local CRS but retrieve the WGS coordinates? I mean, to see the map without shifting (in local) but to have the WGS coordinates. Thank you!

[@burdGIS]

No worries pavel. Are you retrieving coordinates from specific points (a points layer)?

[@pavelbukhteev9062]

@@burdGIS Well, I solved the problem by adding QgsCoordinateTransform into my function. I need the coordinates for my plugin. Thank you for all videos, very useful!

[@burdGIS]

Aha! Great news. Glad to hear you got it figured Pavel. Thanks for watching and supporting the channel :-)

[@jessiebrice4370]

Hi I'm trying to make some maps using the layout manager, all of my layers are in EPSG:27700 and Project CRS too, but the scaling bar is still wrong? Am I missing something about projections? Thanks!

[@burdGIS]

Hi Jessie, you should be able to set the scalebar CRS independently of the project CRS. In your case it will be set to the same. If there's still a scale problem it likely means there's a CRS problem with one or more of your layers earlier in the geoprocessing or map building workflow.

[@giriprasad3715]

I have done georefernced cadestral map. Later I converted that raster to vector. When I import the vector layer on Google satellite, the vector layer is shifted (not exactly matched). I have used same crs for both layers .how can I solve the issue. Thanks in advance

[@burdGIS]

How does the original raster compare to Google satellite?

[@colinhawke9993]

Hi. I am having difficulty displaying Google Satellite maps in QGIS 3.10. It was working fine but recently they have stopped displaying across my projects. I tried reinstalling the XYZ Tiles but that hasn't fixed it. I have recently imported OS Zoomstack successfully and changed CRS to British Grid but according to this video that shouldn't stop google maps displaying. I am really puzzled.

[@burdGIS]

Good question Colin. British national grid is design for the UK. That's fine when using UK data. If you try to bring global data into that projection qgis will have a very hard time trying to project it on the fly. If you change the project crs (you can use the little box in the bottom right of the screen) to EPSG 3857 the global tiles will draw fine

[@colinhawke9993]

@@burdGIS many thanks. Simple solution. Many thanks.

[@AdrianWilliams-wp3kw]

Thanks for the video. I've been trying to create a geotif for use in drone surveys (terrain follow) which have to be in a WGS84:4326 CRS (elevation/datum being particularly important). I've been using open source data Lidar data from the EA (osgb36:2770). However when I reproject (warp) the the CRS to to WGS84:4326 the coords change but the datum/elevations remains the same. Is there some way of rectifying this? Many Thanks.

[@burdGIS]

What would you expect the elevations to change to?

[@AdrianWilliams-wp3kw]

@@burdGIS I was hoping there was a way of changing the elevation to the WGS84 ellipsoid elevation. However I have know managed to achieve this by changing the levels of the lidar data (using LSS) prior to importing it into QGIS. Its a little bit long winded but it seems to work fine. Just a bit of background regarding my initial question; in order to undertake a terrain follow mission using a DJI drone a DSM must be created in GEOtif format. The DSM must be geo-referenced to WGS84 with the ellipsoid altitude rather than the OSTN15 geoid elevation. Thanks for you reply. Your videos have been extremely helpful.