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i read this post where coordinate are convert to different projection 1) about format and unit code INSERT INTO [poi] ([longitude_wgs84], [latitude_wgs84]) VALUES (30, 10), (30, 20), (30, 30), (30, 40), (30, 50); What is for (30 ,10) the format for 30 and the unit of 30? ( ithink unit dfine format ) you ll say it depend of projection datum coordinate system !! 2) in the same post there are 2 projections define using epsg 'EPSG:3857', 'EPSG:4326' what is the epsg or projection name of latitude/longitude ? latitude and longitude are not a projection/Datum name ! flat surface mean also curve ? 
4) i don't find the unit converter or coordinate system metric mfd9 gui ? any clue ? thank's epsg-3857-or-4326-for-web map orthogonal surface curve Attachments:
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