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I have two shapafiles: points and vector grid. I need to combine points which are in the same cell(or cross cell) and sum their values. How can I do this in QGIS?

2 Answers 2

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Since QGIS 3.18 using the array_sum() function, you can use the following expression on the grid layer to calculate the sum of the value attribute from all points that are within a grid-cell automatically:

array_sum (overlay_contains ('points', value))

Screenshot: the expression (together with to_int to get integer values) calculates the blue value for each grid cell: sum of the values of all red points within this cell:

enter image description here

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You need to do a spatial join using the join attributes by location tool. You can choose to sum the attribute field from the points layer. So this should output a new grid layer with the sum of the points attribute

See this tutorial for how to perform it

http://www.qgistutorials.com/en/docs/performing_spatial_joins.html

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