Generate ID for the grid of points from top-left corner down

[المشرف العام]

I have a grid of points extracted from a raster. I need to give them a new ID value to be able to join values from it to another grid in rotated system of coordinates.The automatically generated ID goes from top-left to the right and I need it to be from top-left down. Something like this:

Current:

1 2 3 4

5 6 7 8

9 10 11 12

What is needed:

1 5 9

2 6 10

3 7 11

4 8 12

I have 122140 features so I'd rather not do it manually. I use QGIS 2.8.2 and ArcGIS 10.1. No programming skills for the time being.

Thanks!



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