Outliers: high and low

Hello!
I have the following to translate in reference to GPS measurement:

low outliers: errors when there are near objects that can alter the measurement
high outliers: errors that can occur because of alteration of the ionosphere

My attempt, that do not satisfy me:

anómalos de bajo nivel
anómalos de alto nivel

thank you for your help

Hi, I think you may use "Anomalías" instead "Anómalos", I don't know if in this case "low" and "high" are related with importance or physical height

if "low" and "high" are the importance you can translate it as:

Anomalías menores
Anomalías mayores

Concuerdo con salvadorm

I have found sth that could help:

High-Low GPS observations

depending on the orbit of the satellite.