How to get geometry length in meters in PostGIS?
In this example, SRID 26915 is UTM Zone 15 N, NAD83. It looks like since PostGIS 2.0 (maybe before) you can also just do this with ST_Length by recasting the geometry to geography:
How to return a geography value in PostGIS?
ST_GeogFromText — Return a specified geography value from Well-Known Text representation or extended (WKT). ST_GeographyFromText — Return a specified geography value from Well-Known Text representation or extended (WKT).
Is there an alias for St _ length2d in PostGIS?
If PostGIS is compiled with PROJ version 4.8.0 or later, the spheroid is specified by the SRID, otherwise it is exclusive to WGS84. If use_spheroid=false, then the calculation is based on a sphere instead of a spheroid. Currently for geometry this is an alias for ST_Length2D, but this may change to support higher dimensions.
How to get the version number of PostGIS?
PostGIS_Version — Returns PostGIS version number and compile-time options. Populate_Geometry_Columns — Ensures geometry columns are defined with type modifiers or have appropriate spatial constraints This ensures they will be registered correctly in geometry_columns view.
Is there function like St _ length ( ) but in meters?
In PostGIS, the ST_length () function returns the length of a linestring in some units, but not in meters. Is there a function like ST_Length () but in meters?
Is the spheroid specified by srid in PostGIS?
If PostGIS is compiled with PROJ version 4.8.0 or later, the spheroid is specified by the SRID, otherwise it is exclusive to WGS84. If use_spheroid=false, then the calculation is based on a sphere instead of a spheroid.
How to calculate the length of a polyline using ArcPy?
I have a polyline shapefile that has only one polyline. How do I calculate the length of that polyline using ArcPy? You can use the shape tokens: this is the fastest and arguably the least expensive way to get the length of a feature.
How to re-project a polyline on the fly?
For instance, if your polyline is located geographically in California, US, and stored using geographic coordinate system WGS84 (EPSG 4326), then you could, for instance, use a projected coordinate system NAD_1983_California_Teale_Albers (EPSG 3310) to re-project the feature on-the-fly getting the proper length value.