I have two tools that produce output in OGC WKT format. But they look different. Could you please explain this(I am very new to GIS).

For my project I want the coordinates in the second format. Is it possible to convert from first format to second?

Tool 1: http://dev.giscloud.com/examples/drawingtools.html

POLYGON ((16136169.435794141 -4553684.305378843,16136205.862815436 -4553671.31705568,16136219.448302884 -4553708.341241255,16136182.424117308 -4553720.433817994,16136169.435794141 -4553684.305378843))

Tool 2: https://arthur-e.github.io/Wicket/sandbox-gmaps3.html

POLYGON((144.95369132692065 -37.81764246645652,144.9540426963016 -37.81754923679548,144.9541714423343 -37.81782468772676,144.95381470853533 -37.8179263924262,144.95369132692065 -37.81764246645652))

  • 3
    That's the same format, i.e. POLYGON ((cood pair, coord pair, etc...)). What you are seeing is the coordinates output in different coordinate reference systems (CRS). The top coords look like metres in a projected CRS and the lower ones are Longitude and Latitude in a geographic CRS.
    – user2856
    Jun 26, 2018 at 3:15
  • 3
    Please rewrite the question to focus on this new topic.
    – Vince
    Jun 26, 2018 at 3:38
  • 1
    Yes, it's possible @Hydrogirl, please edit your question to specify the software you use and what CRS each output is in.
    – user2856
    Jun 26, 2018 at 3:44
  • 1
    Is the polygon in the 'first tool' supposed to be the same polygon as in the 'second tool'? Or do they represent different places? If different places, do you know what location the first polygon represents? Otherwise, we can't identify what the CRS could be.
    – mkennedy
    Jun 26, 2018 at 17:45
  • 1
    It's EPSG::3857 AKA "Web Mercator".
    – mkennedy
    Jun 27, 2018 at 19:59

1 Answer 1


Finally found the answer with proj4js library http://proj4js.org/

var proj4 = require('proj4');

var firstProjection = 'EPSG:3857'
var cod = proj4(firstProjection).inverse([16136169.435794141, -4553684.305378843]);

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