# I have shapfiles from US Census....decimal degree vs. Mercator **URL:** \ **Category:** WinForms\ **Created:** [May 17, 2011, 4:36pm UTC](https://community.thinkgeo.com/t/i-have-shapfiles-from-us-census-decimal-degree-vs-mercator/1708 "2011-05-17T16:36:19Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Jean-marie](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/j/a183cd/32.png) [@Jean-marie](https://community.thinkgeo.com/u/Jean-marie)\ **Post date:** [May 17, 2011, 4:36pm UTC](https://community.thinkgeo.com/t/i-have-shapfiles-from-us-census-decimal-degree-vs-mercator/1708/1 "2011-05-17T16:36:19Z")
Hello, When I try to load shapfiles about US ZIP or Counties it seems that when :WorldMapKitProjection.SphericalMercator; The shapefile doesn't show on the map  but seems to work when decimaldegree......?????       worldMapKitDesktopOverlay.Projection = ---
**Author:** ![ThinkGeo](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/thinkgeo/32/25029_2.png) [@ThinkGeo](https://community.thinkgeo.com/u/ThinkGeo)\ **Post date:** [May 18, 2011, 3:13am UTC](https://community.thinkgeo.com/t/i-have-shapfiles-from-us-census-decimal-degree-vs-mercator/1708/2 "2011-05-18T03:13:48Z")
Jean-marie, While using WorldMapKit in projection "SphericalMercator", you should use your own logic to handle shapefiles' projection transformation. Please check the following code for your reference. `winformsMap1.MapUnit = GeographyUnit.Meter;WorldMapKitWmsDesktopOverlay worldOverlay = new WorldMapKitWmsDesktopOverlay();worldOverlay.Projection = WorldMapKitProjection.SphericalMercator;winformsMap1.Overlays.Add("WMK", worldOverlay);Proj4Projection proj4 = new Proj4Projection();proj4.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4326);proj4.ExternalProjectionParametersString = Proj4Projection.GetGoogleMapParametersString();ShapeFileFeatureLayer worldLayer = new ShapeFileFeatureLayer(@"..\..\SampleData\Data\Countries02.shp");worldLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.SimpleColors.Transparent, GeoColor.FromArgb(100, GeoColor.SimpleColors.Green));worldLayer.FeatureSource.Projection = proj4;LayerOverlay staticOverlay = new LayerOverlay();staticOverlay.Layers.Add("WorldLayer", worldLayer);winformsMap1.Overlays.Add(staticOverlay);proj4.Open();winformsMap1.CurrentExtent = proj4.ConvertToExternalProjection(new RectangleShape(-133.2515625, 89.2484375, 126.9046875, -88.290625));proj4.Close();winformsMap1.Refresh();` Regards, Ivan ---
**Author:** ![Jean-marie](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/j/a183cd/32.png) [@Jean-marie](https://community.thinkgeo.com/u/Jean-marie)\ **Post date:** [May 18, 2011, 11:21am UTC](https://community.thinkgeo.com/t/i-have-shapfiles-from-us-census-decimal-degree-vs-mercator/1708/3 "2011-05-18T11:21:54Z")
Works right out of the box!!!      thanks a lot! ---
**Author:** ![Clint](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/c/da6949/32.png) [@Clint](https://community.thinkgeo.com/u/Clint)\ **Post date:** [May 18, 2011, 11:27am UTC](https://community.thinkgeo.com/t/i-have-shapfiles-from-us-census-decimal-degree-vs-mercator/1708/4 "2011-05-18T11:27:55Z")
You are welcome!  Let us know if you have any other questions.      Thanks!