Uncertainty Gravity Data

Hi everyone.
I would like to ask if anybody can help me with quantifying uncertainity on gravity data I downloaded from the Bureau Gravimetrique International BGI.
I know gravity data are affected by a series of uncertainty coming from aquisition (geographic posizion, elevation, drift correction) and processing (interpolation and topographic correction in particular).
Regarding elevation I could maybe compare the elevation of the BGI data to those of the DTM I'm using for the topographic correction. Concerning interpolation I did run a sensitivity study to identify the optimal cellsize to reduce the error with respect to the observed data and the gridded data.
However I'm a bit lost about how to quantify the uncertainity on the topographic correction or any other way to assess uncertainty on the data I have.

Data are in the following format:
source;lat(deg);long(deg);alt(m);g(mgal);FreeAir;Bouguer;validity
35100156;46.2;6.5;883.4;980459.64;4.61;-94.24;0
35100175;45.85473;6.50162;1005.5;980361;-25.1;-137.62;0
35100156;46.0917;6.5017;473;980509.92;-61.96;-114.89;0
25000018;46.2518;6.5025;1080.5;980433.89;35;-85.9;1
25000018;46.1797;6.5027;831;980464.59;-4.7;-97.7;1
25000018;46.2123;6.5027;894.5;980458.72;6;-94.1;1
35100156;45.38;6.505;1379.4;980223.14;-4.62;-158.97;0
35100175;45.83916;6.50819;970.8;980367.07;-28.34;-136.97;0
35100175;46.38339;6.50828;398.5;980587.08;-34.17;-78.76;0

Thank you in advance,
Luca Guglielmetti
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