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<p style="margin-top:0;margin-bottom:0">Hi there,</p>
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<p style="margin-top:0;margin-bottom:0">I have a set of coordinates which are in a user defined projected coordinates system as bellow. Coordinates are in meters.</p>
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<p style="margin-left: 0px; margin-right: 0px; white-space: pre-wrap;"><!--StartFragment-->+proj=sterea +lat_0=53.5 +lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=6378137 +b=6381816.160744 +ellps=GRS80 +units=m +no_defs<!--EndFragment--></p>
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The documentation says the data was transformed from Geographical Coordinate System GRS80 in QGIS database with Coordinate Reference Systems and I found one named Unknown datum based upon GRS 1980 ellipsoid with Authority ID EPSG:4019:
<p style="margin-left: 0px; margin-right: 0px; white-space: pre-wrap;"><!--StartFragment-->+proj=longlat +ellps=GRS80 +no_defs<!--EndFragment--></p>
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<p style="margin-top:0;margin-bottom:0">Is this the GRS 80?</p>
<p style="margin-top:0;margin-bottom:0">I would like to know if I can relay in CRS with <span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">Authority
ID EPSG:4019</span> to transform those projected coordinates back to GRS 80.</p>
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<p style="margin-top:0;margin-bottom:0">Thank you,</p>
<p style="margin-top:0;margin-bottom:0">Marian</p>
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