attribute-joinsqgisrastervector
I have a raster data(.tif), and would like to assign its values to
line and polygon data by location.
Here, I'd like to take min, max, mean and median.
There is "Join attributes by location", but it only supports
joining between vector data and vector data.
Any tools or ideas ?
Yes, this is called Zonal Statistics. You can run it with Zonal Statistics plugin, this is the core plugin, so it doesn't need to be installed separately, simply turn it on. Note that there is not that many statistics available.
For GRASS GIS Zonal statistics, see http://grasswiki.osgeo.org/wiki/Zonal_statistics
It looks as if you want to use "v.vect.stats": count points in areas, calculate statistics from point attributes (needs GRASS 7).
Best Answer
For polygon feature, you can use Zonal statistics from
raster -> Zonal statisticsusing QGIS 2.14.13 to get the min, max, mean and median of a raster:But I am not aware of a tool that can get the same result using a line feature.
But as a workaround, you can create a small buffer polygon around the line and use Zonal statistics to get the min, max, mean and median, then intersect the original line with the buffered polygon to get a copy the attribute into the line feature.