Possibly Wrong conversion in EPSG 5513

[Phogi]

Hi Alexey,

I found some post before regarding EPSG 5513 / 5514 support, which is great, however when I am converting GCPs from WGS84 to EPSG:5513 and 5514 they show different sign (positive vs negative), but in EPSG.io they are the same: https://epsg.io/transform#s_srs=5513&t_srs=5514&x=-527358.6200000&y=-1140103.1800000

Which one is correct? By checking the proj4 string definition they are exactly the same in Metashape, so why there's a different sign for output? I know there's SW vs NE axis but not sure which source is correct.

Hope to hear from you soon.

Best,

[Alexey Pasumansky]

Hello Phogi,

As far as I understand, Northing and Easting values for 5514 (Krovak North) should be negative, whereas Southing and Westing for 5513 (Krovak) should be positive.

Please check page 30 of the following document:
https://www.iogp.org/wp-content/uploads/2019/09/373-07-02.pdf

[Phogi]

Thank you Alexey, it seems that's some issue with gdal or epsg.io, much appreciate for the details!!