Abstract: The method of determining the volume includes associating measured values to a volume based on calibration data. The calibration data can be produced by obtaining reservoir geometry data including coordinates of an internal wall surface and a level measurement path in a reservoir reference; obtaining a set of parameters including at least liquid level along the level measurement path and inclination of the reservoir reference relative to a first horizontal axis; for each parameter of the set, obtaining a plurality of incremental values along a corresponding range of values; and producing calibration data by calculating a matrix of liquid volume values based on the reservoir geometry data for each incremental value combination across the ranges of values of all the parameters.

Abstract: The method generally has the steps of: measuring a measured liquid level value in a reservoir; generating a filtered liquid level value including applying a first noise filtration stage to the measured liquid level value to limit the change of the filtered liquid level value compared to previous liquid level value measurements; determining a variation of the generated filtered liquid level value over a given period of time; comparing the determined variation to a threshold value; when the determined variation is above the threshold value, entering a sloshing mode, the sloshing mode including generating an outputted liquid level value corresponding to a filtered liquid level value generated prior to entering the sloshing mode, the sloshing mode being maintained until the determined variation is below the threshold value; and when the determined variation is below the threshold value, generating an outputted liquid level value corresponding to the filtered liquid level value.