diff --git a/ProjNet.Tests/GitHub/Issues.cs b/ProjNet.Tests/GitHub/Issues.cs
index cbc2939..f6c2c93 100644
--- a/ProjNet.Tests/GitHub/Issues.cs
+++ b/ProjNet.Tests/GitHub/Issues.cs
@@ -71,5 +71,31 @@ public void TestMathTransformBug()
             Assert.That(pt2a, Is.EqualTo(pt2b));
 
         }
+
+        [Test]
+        public void TestIssuesWith3857To25832()
+        {
+            var epsg_3857 = (ICoordinateSystem)ProjectedCoordinateSystem.WebMercator;
+            Console.WriteLine(((IProjectedCoordinateSystem)epsg_3857).Projection.ClassName);
+            Console.WriteLine(epsg_3857.WKT);
+
+            var epsg25832 = _css.GetCoordinateSystem(25832);
+
+            var mt1 = _css.CreateTransformation(epsg25832, epsg_3857).MathTransform;
+            var pt25832 = new Coordinate(702575, 6153153);
+            var pt_3857ex = new Coordinate(1358761.89, 7456070.47);
+
+            var pt_3857 = mt1.Transform(pt25832);
+            Assert.That(pt_3857.Distance(pt_3857ex), Is.LessThan(0.015));
+
+
+            epsg_3857 = _css.GetCoordinateSystem(3857);
+            Console.WriteLine(((IProjectedCoordinateSystem)epsg_3857).Projection.ClassName);
+            Console.WriteLine(epsg_3857.WKT);
+
+            var mt2 = _css.CreateTransformation(epsg25832, epsg_3857).MathTransform;
+            pt_3857 = mt2.Transform(pt25832);
+            Assert.That(pt_3857.Distance(pt_3857ex), Is.LessThan(0.015));
+        }
     }
 }
\ No newline at end of file
diff --git a/ProjNet.Tests/SRID.csv b/ProjNet.Tests/SRID.csv
index 39c56b8..66bc6c5 100644
--- a/ProjNet.Tests/SRID.csv
+++ b/ProjNet.Tests/SRID.csv
@@ -1750,7 +1750,7 @@
 3782;PROJCS["NAD83(CSRS) / Alberta 3TM ref merid 120 W (deprecated)",GEOGCS["NAD83(CSRS)",DATUM["NAD83_Canadian_Spatial_Reference_System",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6140"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4617"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-120],PARAMETER["scale_factor",0.9999],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","3782"]]
 3783;PROJCS["Pitcairn 2006 / Pitcairn TM 2006",GEOGCS["Pitcairn 2006",DATUM["Pitcairn_2006",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6763"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4763"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",-25.06855261111111],PARAMETER["central_meridian",-130.1129671111111],PARAMETER["scale_factor",1],PARAMETER["false_easting",14200],PARAMETER["false_northing",15500],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","3783"]]
 3784;PROJCS["Pitcairn 1967 / UTM zone 9S",GEOGCS["Pitcairn 1967",DATUM["Pitcairn_1967",SPHEROID["International 1924",6378388,297,AUTHORITY["EPSG","7022"]],TOWGS84[185,165,42,0,0,0,0],AUTHORITY["EPSG","6729"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4729"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-129],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",10000000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","3784"]]
-3785;PROJCS["Popular Visualisation CRS / Mercator (deprecated)",GEOGCS["Popular Visualisation CRS",DATUM["Popular_Visualisation_Datum",SPHEROID["Popular Visualisation Sphere",6378137,0,AUTHORITY["EPSG","7059"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6055"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4055"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs"],AUTHORITY["EPSG","3785"]]
+3785;PROJCS["Popular Visualisation CRS / Mercator (deprecated)",GEOGCS["Popular Visualisation CRS",DATUM["Popular_Visualisation_Datum",SPHEROID["Popular Visualisation Sphere",6378137,0,AUTHORITY["EPSG","7059"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6055"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4055"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],AUTHORITY["EPSG","3785"]]
 3786;PROJCS["World Equidistant Cylindrical (Sphere) (deprecated)",GEOGCS["Unspecified datum based upon the GRS 1980 Authalic Sphere",DATUM["Not_specified_based_on_GRS_1980_Authalic_Sphere",SPHEROID["GRS 1980 Authalic Sphere",6371007,0,AUTHORITY["EPSG","7048"]],AUTHORITY["EPSG","6047"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4047"]],PROJECTION["Equirectangular"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",0],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],AUTHORITY["EPSG","3786"]]
 3787;PROJCS["MGI / Slovene National Grid (deprecated)",GEOGCS["MGI",DATUM["Militar_Geographische_Institute",SPHEROID["Bessel 1841",6377397.155,299.1528128,AUTHORITY["EPSG","7004"]],TOWGS84[577.326,90.129,463.919,5.137,1.474,5.297,2.4232],AUTHORITY["EPSG","6312"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4312"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",15],PARAMETER["scale_factor",0.9999],PARAMETER["false_easting",500000],PARAMETER["false_northing",-5000000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Y",EAST],AXIS["X",NORTH],AUTHORITY["EPSG","3787"]]
 3788;PROJCS["NZGD2000 / Auckland Islands TM 2000",GEOGCS["NZGD2000",DATUM["New_Zealand_Geodetic_Datum_2000",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6167"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4167"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",166],PARAMETER["scale_factor",1],PARAMETER["false_easting",3500000],PARAMETER["false_northing",10000000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3788"]]
@@ -1802,7 +1802,7 @@
 3851;PROJCS["NZGD2000 / NZCS2000",GEOGCS["NZGD2000",DATUM["New_Zealand_Geodetic_Datum_2000",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6167"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4167"]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["standard_parallel_1",-37.5],PARAMETER["standard_parallel_2",-44.5],PARAMETER["latitude_of_origin",-41],PARAMETER["central_meridian",173],PARAMETER["false_easting",3000000],PARAMETER["false_northing",7000000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3851"]]
 3852;PROJCS["RSRGD2000 / DGLC2000",GEOGCS["RSRGD2000",DATUM["Ross_Sea_Region_Geodetic_Datum_2000",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6764"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4764"]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["standard_parallel_1",-76.66666666666667],PARAMETER["standard_parallel_2",-79.33333333333333],PARAMETER["latitude_of_origin",-90],PARAMETER["central_meridian",157],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3852"]]
 3854;PROJCS["County ST74",GEOGCS["SWEREF99",DATUM["SWEREF99",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6619"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4619"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",18.05787],PARAMETER["scale_factor",0.99999506],PARAMETER["false_easting",100182.7406],PARAMETER["false_northing",-6500620.1207],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3854"]]
-3857;PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs"],AUTHORITY["EPSG","3857"]]
+3857;PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Mercator_1SP"],PARAMETER["semi_minor",6378137],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],AUTHORITY["EPSG","3857"]]
 3873;PROJCS["ETRS89 / GK19FIN",GEOGCS["ETRS89",DATUM["European_Terrestrial_Reference_System_1989",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6258"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4258"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",19],PARAMETER["scale_factor",1],PARAMETER["false_easting",19500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3873"]]
 3874;PROJCS["ETRS89 / GK20FIN",GEOGCS["ETRS89",DATUM["European_Terrestrial_Reference_System_1989",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6258"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4258"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",20],PARAMETER["scale_factor",1],PARAMETER["false_easting",20500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3874"]]
 3875;PROJCS["ETRS89 / GK21FIN",GEOGCS["ETRS89",DATUM["European_Terrestrial_Reference_System_1989",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6258"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4258"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",21],PARAMETER["scale_factor",1],PARAMETER["false_easting",21500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3875"]]
diff --git a/ProjNet/CoordinateSystems/Projections/MapProjection.cs b/ProjNet/CoordinateSystems/Projections/MapProjection.cs
index 409d64a..a724675 100644
--- a/ProjNet/CoordinateSystems/Projections/MapProjection.cs
+++ b/ProjNet/CoordinateSystems/Projections/MapProjection.cs
@@ -109,7 +109,7 @@ protected MapProjection(IEnumerable<ProjectionParameter> parameters)
             scale_factor = _Parameters.GetOptionalParameterValue("scale_factor", 1);
 
             central_meridian = Degrees2Radians(_Parameters.GetParameterValue("central_meridian", "longitude_of_center"));
-            lat_origin = Degrees2Radians(_Parameters.GetParameterValue("latitude_of_origin", "latitude_of_center"));
+            lat_origin = Degrees2Radians(_Parameters.GetOptionalParameterValue("latitude_of_origin",0d, "latitude_of_center"));
 
             _metersPerUnit = _Parameters.GetParameterValue("unit");