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What are the criteria for selecting features in QGIS?
The criteria for selecting features is based on a QGIS expression. Creates a selection in a vector layer. The criteria for selecting features is based on the spatial relationship between each feature and the features in an additional layer. Condition for the selection. Array of one or more of the following predicates:
How is a vector layer selected in QGIS?
Takes a vector layer and generates a new one that contains only a subset of the features in the input layer. The subset is defined randomly, using a percentage or count value to define the total number of features in the subset. The percentage/count value is not applied to the whole layer, but instead to each category.
How to select polygons in a PostGIS database?
I’m using QGIS 1.8 with a PostGIS database and I have three PostGIS-layers in QGIS a lines layer, a points layer and a polygon layer. What I’m trying to do is to select a polygon in the polygon layer and mark all points within this polygon.
How to open world borders layer in QGIS?
Let’s keep working with the world borders layer open in QGIS for a bit, looking at how we can access the individual features in a layer and select features by attribute. The following piece of code shows you how we can loop through all the features with the help of the layer’s getFeatures () method: ?
Where is the conditional formatting panel in QGIS?
You can enable the conditional formatting panel clicking on at the top right of the attributes window in table view (not available in form view). The new panel allows user to add new rules to format rendering of Field or Full row . Adding new rule opens a form to define: font.
How to copy attribute data from QGIS to excel?
If you want to use attribute data in external programs (such as Excel, LibreOffice, QGIS or a custom web application), select one or more row (s) and use the Copy selected rows to clipboard button or press Ctrl+C. In Settings ‣ Options ‣ Data Sources menu you can define the format to paste to with Copy features as dropdown list: