PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual192 / 310See AlsoST_GeographyFromText, ST_GeomFromEWKT, ST_Length_Spheroid, ST_Perimeter, ST_Transform7.8.23 ST_Length2DST_Length2D — Returns the 2-dimensional length of the geometry if it is a linestring or multi-linestring. This is an alias forST_LengthSynopsisfloat ST_Length2D(geometry a_2dlinestring);DescriptionReturns the 2-dimensional length of the geometry if it is a linestring or multi-linestring. This is an alias for ST_LengthSee AlsoST_Length, ST_Length3D7.8.24 ST_Length3DST_Length3D — Returns the 3-dimensional or 2-dimensional length of the geometry if it is a linestring or multi-linestring.Synopsisfloat ST_Length3D(geometry a_3dlinestring);DescriptionReturns the 3-dimensional or 2-dimensional length of the geometry if it is a linestring or multi-linestring. For 2-d lines it willjust return the 2-d length (same as ST_Length and ST_Length2D)This function supports 3d and will not drop the z-index.ExamplesReturn length in feet for a 3D cable. Note this is in feet because 2249 is Mass State Plane FeetSELECT ST_Length3D(ST_GeomFromText(’LINESTRING(743238 2967416 1,743238 2967450 1,7432652967450 3,743265.625 2967416 3,743238 2967416 3)’,2249));st_length3d-----------122.704716741457←↪See AlsoST_Length, ST_Length2D