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I have bathimetry data in .shp format. The points (picture below shows one of multiple groups/profiles) do not have ID numbers and are randomly dispersed through the attribute table.

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I have selected each group and added group ID to it. Now each point has "Sort" attribute that serves as the group ID. I still need each individual point to have ID number within the group.

I need these points numbered starting with the northernmost point in group (Field2 in attribute table is northing) and ending with the southernmost. So, a point with highest "Field2" value gets value of 1 in "point_num" field.

Basically, what I need to do is sort selected points according to value of "Field2" attribute. How can I do this with (preferably) QGIS field calculator or some other tool?

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In QGIS 3.0, there is a tool Order by expression which enables you to sort a field Ascending or Descending:

enter image description here

The Ascending is selected by default. If you want Descending just deselect Ascending and it should work.

The tool can be accessed from Processing Toolbox -> Vector General -> Order by expression

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  • Ok, this sorting tool works, thanks! Is it possible to do this in existing layer without creating a new one? Also, I need to add numbers from 1 to 55 to these "point_num" attribute after ordering by 1.2 "Field2".
    – Marin Leontenko
    Commented Apr 12, 2018 at 12:19
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    No. The tool creates a new file which is very common when dealing with processing tools. If this answer solved your problem, please accept it and if you have a new question, it is better to ask on separate thread.
    – ahmadhanb
    Commented Apr 12, 2018 at 12:23

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