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<p>Hello,<br /><br />when comparing using spatialreference.org<br />we can find the following information:</p>
<p>-------------------------<br /><br />EPSG:4612<br /><br />+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs <br />-------------------------<br /><br />EPSG:4326<br /><br />+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs <br />-------------------------</p>
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<p>And looks like they are exactly the same. Same projection<br />and same datum (zero to WGS84). And about the ellipses, they<br />are pratctically the same:<br /><br />(From Wikipedia)<br /><br />"The WGS 84 originally used the GRS 80 reference ellipsoid,<br />but has undergone some minor refinements in later editions<br />since its initial publication. Most of these refinements<br />are important for high-precision orbital calculations for<br />satellites but have little practical effect on typical<br />topographical uses. The following table lists the primary<br />ellipsoid parameters.<br /><br />Ellipsoid reference Semi-major axis a Semi-minor axis b Inverse flattening (1/f)<br />GRS 80 6 378 137.0 m ≈ 6 356 752.314 140 m 298.257 222 100 882 711...<br />WGS 84 6 378 137.0 m ≈ 6 356 752.314 245 m 298.257 223 563<br /><br />Equatorial (a), polar (b) and mean Earth radii as defined in the 1984 World Geodetic System revision (not to scale)<br /><br />The very small difference in the flattening thus results<br />in a tiny difference of 0.105 mm in the semi polar axis. "<br /><br /><br />Regards: Janne.<br /><br /><br />********************************************</p>
<p>ivay kirjoitti 2019-08-20 11:31:</p>
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<div>Here is projection of the original shapefile with EPSG 4612.</div>
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<div><em>GEOGCS["JGD2000",</em><em><br /></em></div>
<div><em> DATUM["Japanese_Geodetic_Datum_2000",</em><em><br /></em></div>
<div><em> SPHEROID["GRS 1980",6378137,298.257222101,</em><em><br /></em></div>
<div><em> AUTHORITY["EPSG","7019"]],</em><em><br /></em></div>
<div><em> TOWGS84[0,0,0,0,0,0,0],</em><em><br /></em></div>
<div><em> AUTHORITY["EPSG","6612"]],</em><em><br /></em></div>
<div><em> PRIMEM["Greenwich",0,</em><em><br /></em></div>
<div><em> AUTHORITY["EPSG","8901"]],</em><em><br /></em></div>
<div><em> UNIT["degree",0.0174532925199433,</em><em><br /></em></div>
<div><em> AUTHORITY["EPSG","9122"]],</em><em><br /></em></div>
<div><em> AUTHORITY["EPSG","4612"]]</em></div>
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<div>Thank you.</div>
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<div>‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐</div>
<div>On Tuesday, August 20, 2019 6:11 PM, ivay <ivaygis@protonmail.com> wrote:</div>
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<div>Hi,</div>
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<div>I have a shape file with epsg 4612.</div>
<div>I converted it into new shapefile with epsg 4326.</div>
<div>When I opened both shape files (with 4612 and 4326 epsg codes), there is no change in the X and Y locations.</div>
<div>Does both shapefiles (with epsg 4612 and 4326 codes) have same X and Y values?</div>
<div>My requirement is to convert the original file with "epsg code 4612" exactly into the "epsg 4326" .</div>
<div>Thank you for your ideas.</div>
<div>Ivay</div>
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