This database option takes a semicolon delimited set of key=value pairs (key1=value1;key2=value2;...). Allowed keys are relative-tolerance-percent and absolute-tolerance.
Use relative-tolerance-percent to specify the maximum variation, expressed as a percent, allowed in the distance from the
center point of the ST_CircularString segment to the interpolated ST_LineString segment, relative to the radius of the ST_CircularString
segment. The minimum allowed value for relative-tolerance-percent is 0, meaning the absolute-tolerance setting is always used.
Use absolute-tolerance to specify the maximum absolute variation, expressed in linear units, allowed in the distance
from the center point of the ST_CircularString segment to the interpolated ST_LineString segment. The minimum value allowed
for absolute-tolerance is also the tolerance specified by the SRID.
Regardless of the setting for this database option, there are at least three points per curve segment. Furthermore, no two
consecutive points on the interpolated ST_LineString are within tolerance of each other.
Additional points may be added to ensure the ST_Envelope of the ST_LineString is the same as that of the original ST_CircularString.