I'm a software guy (but don't know much about GIS). I'm also a glider pilot in upstate NY. A lot of the glider folks use a simulator called Condor and QGIS is used to help create photo realistic ground scenery....
They seem to have a hard time at it (just blindly following instructions) I just started using it and was trying to create a step-by-step tutorial for them. I'm using QGIS 2.18.28 on Windows 10/64 bit, 16 Gig of Ram. The tutorial is at http://www.murtari.org/downloads/FLSC_SceneryMultiR1.pdf
It has more details, but here are the basic steps up to the hang. Starting with a brand new project:
- Layer -> Add Layer -> Add raster layer. I select 6 tiff files of satellite imagery (each about 1.5 gig in size)
- Layer -> Add Layer -> Add delimited text. I have a .csv file with 4 calibration points, one in each corner. The selected area is a rectangle 14 miles wide and 52 miles long.
- I select the proper coord system: WGS84 EPSG:4326 - OK
- Raster -> Misc -> Build virtual raster. I choose the same tiff files. OK (no load into canvas)
- Raster -> Projections -> Warp(Reproject). Chose the .vrt created above, Source SRS EPSG:4326, Target SRS our UTM zone 18N, resampling cubic spline (no load into canvas) - OK
- Raster -> Extraction -> Clipper. Chose the file from above. Clipping mode 'extend'. Dragged an area inside the calibration dots (load into canvas). OK . I see a red select area inside my dots.
- Right click in Layers Panel over name of image above.
- Select Save as... Rendered Image, Create VRT, format GTiff, CRS to our zone 18N, uncheck saved file to map. No change to extent.
- NOTE - Wanted hi res using 8192.
- Resolution (current layer): Columns 8192, Rows 24576
- Tiles: 8192 and 8192
- Clicked OK - immediately see a small dialog box pop up, the title says "Saving raster... ?" -- nothing else is visible. QGIS hangs, windows says not responding, about 1.5 gig mem usage and stays there....
If the previous stepped work, we would get a tiff of the selected area which with other tools is converted to a .bmp and then merged into a landscape over textured terrain...