qgis2web hangs with large layer

Question

I am trying to convert multiple raster layers with hundreds of files in each into web tiles.

qgis2web start processing, at "exporting layer1 to PNG" it shoots the CPU to 100%, hours later it crashes with python error.

here is the complete result:

FileNotFoundError: [Errno 2] No such file or directory: '/var/folders/p6/qvt9dldn13sckjk_2jf2hxf80000gn/T/ttn10rp01545831356_piped.tif'

Traceback (most recent call last): File "/Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/qgis2web/utils.py", line 399, in exportRaster processing.run("gdal:warpreproject", warpArgs) File "/Applications/QGIS3.app/Contents/MacOS/../Resources/python/plugins/processing/tools/general.py", line 96, in run return Processing.runAlgorithm(algOrName, parameters, onFinish, feedback, context) File "/Applications/QGIS3.app/Contents/MacOS/../Resources/python/plugins/processing/core/Processing.py", line 139, in runAlgorithm raise QgsProcessingException(msg) _core.QgsProcessingException: Unable to execute algorithm Could not load source layer for INPUT: /var/folders/p6/qvt9dldn13sckjk_2jf2hxf80000gn/T/ttn10rp01545831356_piped.tif not found

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/qgis2web/maindialog.py", line 335, in saveMap feedback=self.feedback) File "/Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/qgis2web/olwriter.py", line 91, in write folder=dest_folder) File "/Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/qgis2web/olwriter.py", line 130, in writeOL popup, json, restrictToExtent, extent, feedback, matchCRS) File "/Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/qgis2web/utils.py", line 225, in exportLayers exportRaster(layer, count, layersFolder, feedback, iface, matchCRS) File "/Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/qgis2web/utils.py", line 401, in exportRaster shutil.copyfile(piped_file, piped_3857) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/shutil.py", line 120, in copyfile with open(src, 'rb') as fsrc: FileNotFoundError: [Errno 2] No such file or directory: '/var/folders/p6/qvt9dldn13sckjk_2jf2hxf80000gn/T/ttn10rp01545831356_piped.tif'

Python version: 3.6.7 (v3.6.7:6ec5cf24b7, Oct 20 2018, 03:02:14) [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] QGIS version: 3.4.1-Madeira Madeira, exported Python Path: * /Applications/QGIS3.app/Contents/MacOS/../Resources/python * /Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python * /Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins * /Applications/QGIS3.app/Contents/MacOS/../Resources/python/plugins * /Library/Frameworks/SQLite3.framework/Versions/D/Python/3.6 * /Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip * /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6 * /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload * /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages * /Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python * /Users/igzebedze/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins * /Users/igzebedze/Dropbox (Personal)/devel/zemljevidi/tiles

• Riccardo: QGIS2web is not ment to create webtiles. It will copy the big tif into a big png. What would you like to accomplish?
• igzebedze: i'd like to create a set of xyz tiles to use in a browser map. i thought this was the way to do it?

Answer 1

As far as I know, qgis2web was designed to export static maps (exporting your shapefiles/geopackages to geojson) and trying to translate your current style setting into a leaflet/openlayers based style. the basemap is fetched form other sources like OSM, Google, Esri.

QGIS2web is not meant to convert a raster to xyz tiles to serve as a basemap.

For creating a xyz-tiled basemap from a raster you should have a look at gdal or tilemill.

• kartoza-geek: If you want to create xyz tiles the are are a couple of options the easiest one is to use gdal.org/gdal2tiles.html which will also create a static html page. Alternatively you can install serve up the raster layer through GeoServer. If you prefer to use QGIS you can use QGIS server + Mapproxy