Hi, I ran into same problems when dealing with a few thousand files. The idea was to load the very small shp files created by another process and then merge then. I solved the problem by loading and merge it then I SAGA. It generally loads everything into memory and probably does not keep a file handle once the file are open. I believe this issue is created by Windows and not QGIS. I remember being told to go on Linux as this maximum operating system file max can be modified with a script.
Nicolas > Le 18 nov. 2019 à 04:59, Jésahel Benoist <[email protected]> a écrit : > > From my experience, GeoTIFF has a long history and is a more > appropriate format to handle multiple large rasters. As a container, > it could handle misc compression format (JPEG an other), misc > representation at different scales (resolution is not a problem), misc > color modes with raster/vectorial alpha layer, and so on. In one of my > projects I handle more than 400 raster files (4000x4000x32) without > any problem. > Of course, a better and final choice would be to tile everything, but > it is sometimes difficult with older maps. > >> Le lun. 18 nov. 2019 à 10:12, Patrick Dunford >> <[email protected]> a écrit : >> >> Good day to all >> >> One of the user experiences I have had from using the Qgis software has been >> with projects using large numbers of raster tile layers. These layers are >> generally tiles that have a size of 4800x7200 pixels in GeoJPEG format and >> have either been downloaded directly from tile servers to these locally >> stored files, or created from downloaded tiles with other layers overlaid in >> Gimp projects. >> >> There appears to be some architectural limit in Qgis desktop software >> relating to either the total number of raster layer [files] in a project or >> to the total number of pixels in raster layer [files] in a project. This is >> unrelated to the number of layers or pixels currently enabled for display in >> the map canvas. In practice, the appearance of this limit is that it is >> kicking in long before the host computer's own physical resources are >> anywhere near fully engaged. Map digitising and editing is done on systems >> with 32 GB of physical memory (RAM) and 200 GB of SSD-based virtual memory >> (swap) and these systems are able to edit very large Gimp projects for user >> tile creation that often engage all of the system's physical memory and >> around 100 GB of the virtual memory without problems. But these types of >> numbers are in practice never seen with Qgis projects when the raster layer >> limit is being seen. >> >> The appearance of a raster layer limit is generally experienced in older >> versions of the software by layers being displayed on the canvas as garbage, >> and in newer versions by the software crashing. It will only start working >> again if raster layers are removed from the project. However, when layers >> are loaded from WMTS servers, no appe _______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
