<div dir="ltr"><div>Greetings to all!</div><div><br></div>I use Natural Earth data:
<a href="https://www.naturalearthdata.com/downloads/">https://www.naturalearthdata.com/downloads/</a><br>> All Natural Earth data use the Geographic coordinate system (projection), WGS84 datum<br>That is, Natural Earth data are points on an ellipsoid.<br><br>To display geographical data on the map, I pre-convert it from Shapefile to GeoJSON.<br>To do this, I use the ogr2ogr program (GDAL library).<br>In ogr2ogr there are conversion options:<div>from -s_srs <a href="https://gdal.org/programs/ogr2ogr.html#cmdoption-ogr2ogr-s_srs">https://gdal.org/programs/ogr2ogr.html#cmdoption-ogr2ogr-s_srs</a> </div><div>to -t_srs <a href="https://gdal.org/programs/ogr2ogr.html#cmdoption-ogr2ogr-t_srs">https://gdal.org/programs/ogr2ogr.html#cmdoption-ogr2ogr-t_srs</a>.</div><div><br><div>If I understood correctly, the GDAL project uses OSGeo / PROJ as a projection library.<br><br>Please tell me what the values for -s_srs and -t_srs should be in order to perform the conversion:<br>points located on an ellipsoid (WGS84 datum) ===> to points located on a sphere?<br></div></div></div>