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I have some points in .shp vector file and I need to convert them in .tif file with 1km x 1km resolution. The problem is - there are some points in one cell during conversion, and some values are missed. How can I convert these point without missing? Is there any function that will sum values in cell(in QGIS)? Any suggestion are acceptable.

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First create a corresponding grid with:

Vector / Research tool / Vector grid (polygon)

Then use the join attributes with sum:

Vector / Data management tools / Join attributes by location

And finally rasterize the polygon according to the calculated attribute:

Raster / Conversion / Rasterize

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