Questions tagged [aggregate]

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Making a spatial link to points within polygons in the field calculator in QGIS

I have a polygon shapefile of the counties in the UK and a separate point shapefile of project sites. Within the project sites attribute table I would like to add a new virtual column with the name ...
3
votes
1answer
75 views

Calculating the sum of a column based on another column in another table in the field calculator of QGIS

I have a records table with site numbers and abundances of different species at that site (e.g. site 1 has 6 common bats and 13 pipistrellus bats). I would like to sum total number (i.e. 6+13=19) at ...
2
votes
1answer
59 views

Aggregates Functions - QGIS - Calculating Area Explained

I've been reading through question and answers on the Aggregates Function, but have been unable to obtain a clear understanding and solution to my problem. I have a polygon grid ("Grid 4km") and I ...
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Aggregate&Clip OR Clip&Aggregate?

I have a raster data with resolution of 0.00833333 deg and want to aggregate it to 0.25 deg resolution. I used two approach: I first clipped my raster with my study area (polygon feature) and then ...
3
votes
1answer
140 views

Layout expression for getting all features of layer within the current map view in QGIS 3?

In a map layout template, I want to insert an expression which gets all feature's names of a certain layer, which are contained in the current layout's view/extent. Is there a way to get an aggregate ...
1
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1answer
1k views

Using Aggregate and Infowindow in CartoDB

I'd like to use CartoDb to map historic addresses of a city (link to demo). Individual addresses are mapped as points on the map. Detailed information for each address point should be displayed in ...