<div dir="ltr">As Zoltan suggested, a .vrt is a good approach, but you will want overviews also so that you can zoom out. You can create overviews (aka pyramids) of .vrt files.<div><br></div><div>Personally, I'd suggest creating one, or a few, big GeoTIFFs with internal or external overviews. I have a 4,400 sq mile (1,140,000 hectare) area of 3 inch and 6 inch RGB imagery that's in 8 files with with JPEG YCbCr compression. Including overviews, the total size is 150GB and the performance is excellent. Check out cloud optimized geotiffs. Despite the name, they provide great performance and compression on local file systems (and are obviously cloud ready if/when you need to server them from cloud storage).</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 14, 2022 at 1:50 PM Zoltan <<a href="mailto:zoltans@geograph.co.za">zoltans@geograph.co.za</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div dir="auto">Hi Jason,<br></div>
<div dir="auto">You just need to create a VRT.<br></div>
<div dir="auto">The vrt is just that: a virtual raster table.<br></div>
<div dir="auto">Fiddle with the options and notice that you can mix rasters that have differing projection.<br><br></div>
<div dir="auto">Test out on maybe a 100 or so Raster files and when you get the feel for it, dump the lot in. I've had >5000 files in one with no hassles.<br></div>
<div dir="auto">Note that if you output your vrt file into the same folder as your rasters, when you recreate your vrt, it will read in your old one and go into a loop.<br></div>
<div dir="auto">I logged this as a bug and was told unceremoniously that it was not a bug.<br><br></div>
<div dir="auto">Btw, when you first load your vrt into qgis, have rendering turned off.<br></div>
<div dir="auto">Then set your zoom display scales before turning rendering on again. This will stop qgis from trying to display all your tasters if you happen to be zoomed out too far.<br><br></div>
<div dir="auto">Have fun, it works well.<br><br></div>
<div dir="auto">Regards <br></div>
<div dir="auto">Zoltan <br><br></div>
<div dir="auto">Sent from <a href="http://www.bluemail.me/r?b=10698" target="_blank">BlueMail</a> </div>
<div class="gmail_quote">On 14 Jan 2022, at 21:45, Jason Aleksi <<a href="mailto:jason.aleski@gmail.com" target="_blank">jason.aleski@gmail.com</a>> wrote:<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">I am trying to add imagery in qGIS. In ArcMap, I had to create a Mosaic Dataset, then a Raster Catalog. It tooks days to create due to the large files and quantity of files. I have 6 inch imagery of a county in a folder. The GeoTIFFs are about 308GB in size and approx 6,610 files (TIF and TIFW). When I attempt to create a raster layer, it will only pull in 100 images. <div><br></div><div>Will I have to create 305 Layers with 100 images each? Or is there a better way? I'm at a loss for terms to even search for. I feel I've exhausted Google! If there is a better way, could you possibly point me in the right direction?</div><div><br></div><div>FTW: I also have MrSID Tiles and Composites, in a separate directory.</div><div><br></div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Richard W. Greenwood<br><a href="http://www.greenwoodmap.com" target="_blank">www.greenwoodmap.com</a></div></div>