I was testing rendering of data via GitHub in geojson format, because I wanted to use it for INSPIRE data. INSPIRE data are in GML 3.2.1 format. I've downloaded one of datasets from http://services.cuzk.cz/gml/inspire/cp/epsg-4258/ (which is in ETRS). I needed to get json file from it, so I've opened GML file in QGIS (version 1.9) and saved it as GeoJSON file (CRS=EPSG::4326) and then uploaded to my GitHub. Order of coordinates in geojson is (easting, northing), but after saving file from QGIS it's (northing, easting). My data comes from Czech Republic, but it's rendered in Yemen.
Does anybody know how to switch order of coordinates (or axis) in GeoJSON file?