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3

The EPSG: 3857, WGS 84 / Pseudo Mercator in QGIS is called WGS84 Web Mercator (Auxiliary Sphere) in ArcGIS. You are simply not using the right projection.


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The length functions work differently with 3D linestring geometries: ST_Length - returns 2D distances for geometry types, and oddly 3D distances for geography types (but not in this question) ST_Length_Spheroid - returns 3D distances for geometry types Your example is in 3D, so it will calculate the 3D length with ST_Length_Spheroid and the 2D length ...


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A very simple brute force approach: take the first points coordinates and convert them from ISN93 / Lambert 1993 to WGS84 degrees using cs2cs in the OSGEO4W shell cs2cs +init=epsg:3057 +to +init=epsg:4326 -f "%%.8f" <ISN93.txt >WGS84.txt build a local omerc CRS on that point, with the "local coordinates" as false Easting and Northing convert the ...


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I set the data frame projection to WGS84 Web Mercator (Auxiliary Sphere) as suggested by Nahas and this didn't change the end result. However looking at the previous thread supplied by Vince (QPJ files on ESRI software) the answer at the bottom suggested deleting the prj. and .qpjs files then bringing the data in. I did this, assigned projection to WGS84 ...


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I guess you stumbled over this note on page 53: subsequent civilian adoption of the systems usually ignores the zone prefix to easting. Where this is the case the formulas below do not apply: use the standard TM formula separately for each zone The formulas on page 54 should only be used if the zone number is written before the false Easting, which ...


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This is the answer. Sometimes you have to go through all the process of asking a question to understand the solution. JavaScript: /** * Converts spherical web mercator to tile pixel X/Y at zoom level 0 * for 256x256 tile size and inverts y coordinates. * * @param {L.point} p Leaflet point in EPSG:3857 * @return {L.point} Leaflet point with tile pixel ...


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Postgis is correct. Your line is in 3d space, and in fact has a length of ~482m even in the British National Grid. 338 meters is also correct but it corespondents in the projection of the 3d line in the 2d space. with a as ( select st_Geomfromewkt('SRID=27700;MULTILINESTRING(( 423216.279 574665.249 0, 423206.315 574708.077 44.649, 423158.458 ...



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