topic Re: What type of Geographic Coordinate system does JMP use? in Discussions

What type of Geographic Coordinate system does JMP use?

joelahn — Sun, 11 Jun 2023 11:05:35 GMT

Hi,

I am trying to map coordinate data from Korean Government into JMP; because the data set given is much bigger and has detail resolution of map.

However, I have no idea how to convert the X-Y Coordinate to Longitude/Latitude system as used in Google or JMP.

So far as I am aware, the coordinate of X-Y is given in EPSG:5174.

This is the sample data from the file.

[XY File]

Shape Part X Y
1 1 197597.735 454551.233

[Name File]

Shape Code Name
1 1111014000 서울특별시 종로구 삼청동

With application of real estate price in Seoul, I produced the graphic as below / yet I wish to convert X-Y into Long/Lat Axis.

Re: What type of Geographic Coordinate system does JMP use?

paul_vezzetti — Tue, 08 Sep 2020 15:37:02 GMT

I believe it should be WGS84. I converted those coordinates and got:

126.975687°, 37.5904772°

Does this location look like what you would expect?

Re: What type of Geographic Coordinate system does JMP use?

joelahn — Tue, 08 Sep 2020 16:46:38 GMT

Yes, I figured it out, but then I cant convert XY table into WGS84-(EPSG3857?) from EPSG5174 (what I have).
So I went up to a point where I downloaded QGIS and opened up SHP file and got that coordinate changed to EPSG3857 of which is used for OpenStreetMap that is also used in JMP Background Map as Street Map, yet I have no idea how to extract it to csv or similar. Is there any addins that can convert different map coordinates including z axis vector projectile to rectify elliptical aberration during conversion if any?

Re: What type of Geographic Coordinate system does JMP use?

joelahn — Wed, 09 Sep 2020 02:28:04 GMT

I think I got it sorted somehow.

1. Converted X-Y Geometric Coordinate from EPSG5174 (Korean Belt) to EPSG4326 (WGS 84 - World), by using QGIS tool

2. Set X-Y into Longtitude / Latitude Coordinate format

3. Checked if it matches with OSM (Open Street Map)

* I am not sure of its accuracy, but for now this will do.

Thanks for your help! @paul_vezzetti