[Qgis-user] Qgis - create attribute at regular interval along Z axis based on above attribute elevation

[Francois Chartier]

Hi,

I am using Microsoft Access to populate a data set at regular intervals
along the vertical axis between two elevation ranges (50 to 350 masl) and
have the attribute (which does not exist) of that elevation to become the
attribute of the above data point.  example at 124.4, attribute at location
1 is A,  therefore at 124 attribute becomes A, and this down to the next
data point at example 121.6 masl where it is B (you will at location 1: at
124=A, 123=A, 122=A).
The goal being to interpolate different elevation slices at regular
intervals as data points are not all at the same elevations depending on
location.
I am able to do this with a Cross Join query in access and then removing
any intervals above top and bottom.  this is quite fastiduous, and i am
wondering if i can do this straight in qgis, or
if i can run an interpolation with a condition that the value at location
x,y equals the next above attribute value.  this would keep the attribute
table much smaller.

thanks
F
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