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PostGIS 1.5.8 Manual218 / 310DescriptionConverst a CIRCULAR STRING to regular LINESTRING or CURVEPOLYGON to POLYGON. Useful for outputting to devicesthat can’t support CIRCULARSTRING geometry typesConverts a given geometry to a linear geometry. Each curved geometry or segment is converted into a linear approximation usingthe default value of 32 segments per quarter circleAvailability: 1.2.2?This method implements the OpenGIS Simple Features Implementation Specification for SQL 1.1.This method implements the SQL/MM specification. SQL-MM 3: 7.1.7This function supports 3d and will not drop the z-index.This method supports Circular Strings and CurvesExamplesSELECT ST_AsText(ST_CurveToLine(ST_GeomFromText(’CIRCULARSTRING(220268 150415,220227150505,220227 150406)’)));←↪--Result --LINESTRING(220268 150415,220269.95064912 150416.539364228,220271.823415575 ←↪150418.17258804,220273.613787707 150419.895736857,220275.317452352 150421.704659462,220276.930305234 150423.594998003,220278.448460847 ←↪150425.562198489,220279.868261823 150427.60152176,220281.186287736 150429.708054909,220282.399363347 ←↪150431.876723113,220283.50456625 150434.10230186,220284.499233914 150436.379429536,220285.380970099 ←↪150438.702620341,220286.147650624 150441.066277505,220286.797428488 150443.464706771,220287.328738321 150445.892130112,220287.740300149 ←↪150448.342699654,220288.031122486 150450.810511759,220288.200504713 150453.289621251,220288.248038775 ←↪150455.77405574,220288.173610157 150458.257830005,220287.977398166 150460.734960415,220287.659875492 ←↪150463.199479347,220287.221807076 150465.64544956,220286.664248262 150468.066978495,220285.988542259 ←↪150470.458232479,220285.196316903 150472.81345077,220284.289480732 150475.126959442,220283.270218395 150477.39318505,220282.140985384 ←↪150479.606668057,220280.90450212 150481.762075989,220279.5637474 150483.85421628,220278.12195122 ←↪150485.87804878,220276.582586992 150487.828697901,220274.949363179 150489.701464356,220273.226214362 ←↪150491.491836488,220271.417291757 150493.195501133,220269.526953216 150494.808354014,220267.559752731 ←↪150496.326509628,220265.520429459 150497.746310603,220263.41389631 150499.064336517,220261.245228106 ←↪150500.277412127,220259.019649359 150501.38261503,220256.742521683 150502.377282695,220254.419330878 ←↪150503.259018879,220252.055673714 150504.025699404,220249.657244448 150504.675477269,220247.229821107 ←↪150505.206787101,220244.779251566 150505.61834893,220242.311439461 150505.909171266,220239.832329968 ←↪150506.078553494,220237.347895479 150506.126087555,220234.864121215 150506.051658938,220232.386990804 ←↪150505.855446946,