координаты в файле geojson

Добрый день! подскажите что за координаты получаются при экспорте с карты росреестра в файл geojson
""{"type":"FeatureCollection",
"features":[{"type":"Feature",
"properties":{"name":"Полигон-1","buffer":0},
"geometry":{"type":"Polygon","coordinates":
[[[3147993.3003062834,7926480.076194271],
[3147687.552193143,7925314.411512924],
[3149235.4020159156,7925658.378140207],
[3149254.511272987,7925658.378140207],
[3149254.511272987,7926766.715050341],
[3147993.3003062834,7926480.076194271]]]}}],
"crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:EPSG::3857"}}}""
когда координаты в файле KML
28.2789049597,57.8050712161
28.2761583777,57.7994916382
28.2900629492,57.8011381608
28.2902346106,57.8011381608
28.2902346106,57.8064431113
28.2789049597,57.8050712161

 

EPSG:3857

WGS 84 / Pseudo-Mercator -- Spherical Mercator, Google Maps, OpenStreetMap, Bing, ArcGIS, ESRI
Share on: T Q
Transform Get position on a map

This is projected coordinate system used for rendering maps in Google Maps, OpenStreetMap, etc. For details see Tile system.
Alternatives codes : 900913 3587 54004 41001 102113 102100 3785

Attributes

Unit: metre
Geodetic CRS: WGS 84
Datum: World Geodetic System 1984
Ellipsoid: WGS 84
Prime meridian: Greenwich
Data source: OGP
Information source: Microsoft.
Revision date: 2015-11-25
Scope: Certain Web mapping and visualisation applications. It is not a recognised geodetic system: for that see ellipsoidal Mercator CRS code 3395 (WGS 84 / World Mercator).
Remarks: Uses spherical development of ellipsoidal coordinates. Relative to WGS 84 / World Mercator (CRS code 3395) errors of 0.7 percent in scale and differences in northing of up to 43km in the map (equivalent to 21km on the ground) may arise.
Area of use: World between 85.06°S and 85.06°N.
Coordinate system: Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.

 

меркатор на гуглосфере, EPSG:3857

kml всегда в EPSG 4326

 

Спасибо за ответ!