I am very new to GIS and am trying to use QGIS 2.8 to make a very large display map of Southern Ontario, roughly 4 feet by 8 feet. I would like to use aerial imagery, and am thinking of using the Bing aerial base map for that. The problem is, I would need to make an image file which when blown up to that size, doesn't look blurry.

I've vaguely heard of georeferencing being used to "stitch together" high-resolution images of small areas, which I thought might be helpful.

Are there any other efficient ways I could go about this?

closed as too broad by PolyGeo Jun 14 at 23:15

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    Web maps (like Bing) are optimised for web (meaning they are a lower dpi for faster web loading in the browser) you may have to source higher res aerial imagery. plus you will need permission from the owner (Microsoft) - The imagery will be costly for a province the size of Ontario (even the GTA). – Mapperz Jun 14 at 15:01
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    Digital Globe might be a useful place to source your data digitalglobe.com/products/satellite-imagery – Mapperz Jun 14 at 15:09

With the QuickMapService plugin you can add lots of basemap including aerial imagery.

That being said most of online imagery are at low DPI as they are intended to be viewed on a screen, when printed the result is likely to be disappointing (that's also true for non imagery basemap). You may try to find some online service providing high resolution image (look for WMS service that let you request high DPI).

Another point to be avare of is the way QGIS request the base map tile on the print composer by getting higher zoom level tile to be able to produce the desired DPI output so what you see on screen is not what you will get to print.

Lastly, some provider limit the size of the image you can request/print (and 4 by 8 feet is for sure above the limit).Also don't forget to consider the licence of the data (printing for personal use is usually not a problem but there may be a size limit, for professional/commercial use there are usually more restriction).

For best result (and real control of your output) you should try to source and download a suitable imagery to work with (but high quality/high resolution and free are rarely seen together...)

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