topic convert projection &quot;height&quot; to scale for proj.4 in Coordinate Reference Systems Questions https://community.esri.com/t5/coordinate-reference-systems-questions/convert-projection-quot-height-quot-to-scale-for/m-p/787076#M516 <HTML><HEAD></HEAD><BODY><P>The projection "MAGNA_Bogota_DC_2005" has the following parameters:</P><P>False_Easting: 92334.879<BR />False_Northing: 109320.965<BR />Longitude_Of_Center: -74.14659166666668<BR />Latitude_Of_Center: 4.680486111111112<BR />Height: 2550.0<BR />Linear Unit: Meter (1.0)</P><P></P><P>However, the projection library proj.4 does not support a height parameter as input,&nbsp; rather the more standard TM parameter scale (k_0). Does anyone know how I would define the above projection in proj.4?</P></BODY></HTML> Mon, 01 May 2017 15:49:04 GMT LorenDawe 2017-05-01T15:49:04Z convert projection "height" to scale for proj.4 https://community.esri.com/t5/coordinate-reference-systems-questions/convert-projection-quot-height-quot-to-scale-for/m-p/787076#M516 <HTML><HEAD></HEAD><BODY><P>The projection "MAGNA_Bogota_DC_2005" has the following parameters:</P><P>False_Easting: 92334.879<BR />False_Northing: 109320.965<BR />Longitude_Of_Center: -74.14659166666668<BR />Latitude_Of_Center: 4.680486111111112<BR />Height: 2550.0<BR />Linear Unit: Meter (1.0)</P><P></P><P>However, the projection library proj.4 does not support a height parameter as input,&nbsp; rather the more standard TM parameter scale (k_0). Does anyone know how I would define the above projection in proj.4?</P></BODY></HTML> Mon, 01 May 2017 15:49:04 GMT https://community.esri.com/t5/coordinate-reference-systems-questions/convert-projection-quot-height-quot-to-scale-for/m-p/787076#M516 LorenDawe 2017-05-01T15:49:04Z Re: convert projection "height" to scale for proj.4 https://community.esri.com/t5/coordinate-reference-systems-questions/convert-projection-quot-height-quot-to-scale-for/m-p/787077#M517 <HTML><HEAD></HEAD><BODY><P>Hi Loren,&nbsp;</P><P></P><P>As far as I know, PROJ.4 hasn't implemented this map projection method yet. <A href="http://www.epsg-registry.org">EPSG</A> now has it, calling it "Colombia Urban", WKID:1052, so it would be relatively simple for someone to implement it. You might add an issue to the <A href="https://github.com/OSGeo/proj.4/issues">proj.4 GitHub repository</A>.</P><P></P><P>It's very unusual and there's not really another projection like it that I know about. It actually has different x and y scaling so there isn't a single scale factor.&nbsp;</P><P></P><P>Melita</P></BODY></HTML> Mon, 01 May 2017 22:39:49 GMT https://community.esri.com/t5/coordinate-reference-systems-questions/convert-projection-quot-height-quot-to-scale-for/m-p/787077#M517 MelitaKennedy 2017-05-01T22:39:49Z