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I have a shapefile with polygons which represent a raster which represents all countries on Earth (~70,000 cells) and one shapefile layer from NaturalEarthData which represents the worlds oceans. Ho …

How can I check if a value in a cell of a specific column is unique in the respective column or not. e.g. I have a column called OBJECTID. Some of the ID's are unique whereas others exist twice. I …

The answer has been posted in the comments by Joseph: Use an expression like: if(count("OBJECTID", "OBJECTID") = 1, 1, 0) where 1 shows it is unique, 0 it is not.

Is there a command directly in the QGIS field calculator that is equivalent to Excel's SUMIF (without exporting to a CSV file)? …

Is there a way to delete all rows in QGIS in which the cell of a specific column in the attribute table is empty? e.g. line three in the table below. …

I have two layers. Layer 1 contains points (x,y) and layer 2 contains one polygon. All points in layer 1 are positioned within the polygon of layer 2. The points in layer 1 contain an attribute with i …

I have a single layer with shapes (raster cells) that represent all countries on earth (the figure below shows france). Each shape has specific attributes. Is it possible to merge the shapes by th …

internet and came across the follwing training manual chapter: https://docs.qgis.org/2.8/en/docs/training_manual/complete_analysis/raster_to_vector.html However, the required menu entry does not exist in my QGIS …

I downloaded a TIFF image from USGS Earth Explorer from which I determined the contour lines and saved them in a shapefile (see tutorial http://www.qgistutorials.com/en/docs/working_with_terrain.html) …

I am trying to convert the format using the Raster -> Conversion -> Translate (Convert Format) ... dialogue in QGIS. However, if I run e.g. …

Whenever I want to apply the field calculator (e.g. for $id or $area), QGIS crashes (waiting to respond). My PC has 32GB RAM. Any idea what I can do? …

I came across the correct answer! Don't use the attribute table but rather use the field calculator directly from the main window. Worked well forme! Took only a minute or so. Solved, thanks!

I have two shapefiles. One consists of squared grid cells and contains ... let's say precipitation data. The other one was downloaded from NaturalEarthData and contains country-internal administrative …

'INPUT' : '/ne_10m_admin_1_states_provinces/ne_10m_admin_1_states_provinces.shp', 'OVERLAY' : 'split.shp', 'OUTPUT' : 'memory:' } Traceback (most recent call last): File "C:/PROGRA~1/QGIS3~1.0/apps/qgis … /python/plugins\processing\algs\qgis\Union.py", line 94, in processAlgorithm indexA = QgsSpatialIndex(sourceA, feedback) Exception: unknown Execution failed after 0.19 seconds Loading resulting layers …

I would like to import a KMZ file with data on basin internal evaporation recycling into QGIS. … However when I import the KMZ file into QGIS, the relevant data (Bier-jan, BIER-feb, ...) is not added in individual columns of the attribute table but rather all values are added into one single column …