To do this make sure you have the GDAL Tools Plugin installed in QGIS (it should ship standard in most distributions). We want to create our Virtual Raster (VRT) in QGIS. And QGIS has a great little tool to build a virtual raster. Thankfully there is a way around it, with another great feature of GDAL - Virtual Rasters (VRT’s). Normally QGIS will open any raster file with GDAL, and an online file read with vsicurl should be no different, but unfortunately there is a hard coded assumption in the QGIS GUI that if you’re adding a raster layer that is not WMS or WCS then of course it must be a file. The key to reading a Cloud Optimized GeoTIFF with QGIS is the ‘vsicurl’ virtual file system of GDAL. In the protocol dialog, select Type 'HTTP/HTTPS/FTP' and paste the URL from the link location (in this case from the image of the Indonesian Red Cross).Ĭlick 'Add' and when the COG is loaded into QGIS, close the Data source manager. In the Data source manager Browser choose the 'Raster' dialog and select 'Protocol: HTTP(S), cloud, etc.'. To open the Data source manager click the icon. The Data source manager within QGis provides an interface for a variety of data sources. You can paste this into a scratch pad document to use later, or you can just not copy anything else and use it in our next step in QGIS. This will copy the link you need to your clipboard. To get the proper reference to the Cloud Optimized GeoTIFF you must right-click on the ‘download’ icon and then click ‘copy link address'. I’m going to use this one from the Indonesian Red Cross. Browse around and find an image that suits your fance. Some users will already have a Cloud Optimized GeoTIFF that they can use, but if you don’t and want to try out COG’s yourself then head over to OpenAerialMap. long term release 2.18.28 'Las Palmas' did not yet supported reading a COG as a main operation, but since QGIS already used GDAL as its main data format library it’s possible with a little bit of configuration in those versions as well. Since QGis release 3.2, reading COG is supported within the data source manager ( See changelog).
TUTORIEL QUANTUM GIS HOW TO
This tutorial will show you how to read a Cloud Optimized GeoTIFF (COG) in QGIS - streaming straight from its online location instead of downloading it.
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