The value 85.051129° is the latitude at which the full projected map becomes a square, and is computed as The projection is neither strictly ellipsoidal nor strictly spherical. When I convert from wgs84 to epsg:3857, I get numbers that I just don't understand:I know that the lat,lng coordinate I took is in the tile Googleマップでは、epsg：3857という投影法を使用してタイルを描画することを理解しています。私はWGS84からEPSGに変換すると：3857、私はちょうど理解していない番号を取得：(answering own question, hoisted from comment to question)It seems that I may have reversed lat,lng. The reason they deviate is because the Web Mercator specifies that coordinates be given as surveyed on the WGS 84 ellipsoidal model. Certain Web mapping and visualisation applications.

Even so, they will not deviate enough to be noticeable by eye. Based on transforming (180,0), it seems that this epsg:3857 coordinate system is centered at the equator and scales by meters at the equator, using a circumference of the earth of 40075016.68557849m. Relative to WGS 84 / World Mercator (CRS code 3395) errors of 0.7 percent in scale and differences in northing of up to 43km in the map (equivalent to 21km on the ground) may arise. Using 3 EPSGのミスアライメント：4326とEPSG：3399座標 1 ズーム係数0でEPSG：3857をピクセル座標に変換する方法は？0 GeoTools、GoogleマップのCRSを変換する 1 投影EPSG：3857から複数の画像をEPSGに変換する：21781 1 練習用Dockerコンテナ https://github.com/kagyuu/DockerExam/tree/master/ubuntu_mapserver

The default CRS for the project is set to EPSG:3857 Pseudo-Mercator. So I guess that's how to scale the result.You do not need to specify WGS84 as source projection. TanDEM-X Forest/Non-Forest Map SRTM X-SAR DEM CORINE Land Cover Land Cover DE MODIS-EU Daily Mosaic MODIS-DE Mosaic RapidEye RESA - L3M Mosaic - Germany GUF® - Global Urban Footprint® v1 - EPSG:3857 (WGS 84 / Pseudo-Mercator) for the maps of the OpenStreetMap-project and commercial products such as Bing Maps or Google Maps. Even so, they will not deviate enough to be noticeable by eye. Title SAGTA map downloader Description A service provided by the Southern African Geography Teachers' Association for teachers and learners to generate and download custom maps for teaching, study or assessment porposes. Learn more about Stack Overflow the company It uses the same formulas as the standard Mercator as used for While the Web Mercator's formulas are for the spherical form of the Mercator, geographical coordinates are required to be in the Formulas for the Web Mercator are fundamentally the same as for the standard spherical Mercator, but before applying zoom, the "world coordinates" are adjusted such that the upper left corner is Because the Mercator projects the poles at infinity, a map using the Web Mercator projection cannot show the poles. (EPSG 3857) Die Daten in der Open Street Map-Datenbank werden in einem gcs mit EinheitenDezimalgrad und Datum von wgs84 gespeichert. The ellipsoidal Mercator has these same properties, but models the earth as an ellipsoid. Geographic Information Systems Stack Exchange works best with JavaScript enabled I have read all the other questions/answers that I could find on this topic. Unlike the ellipsoidal Mercator, however, the Web Mercator is not quite conformal. Anybody can answer Es gibt ein paar Dinge, die Sie verwechseln. This is a CRS popularly used for web mapping and is a decent choice for our purpose, so we can leave it to its defalt value. The same projection is used e.g. Discuss the workings and policies of this site If you do not explicitly set one, your map is going to use our default which is the Web Mercator projection (EPSG:3857). The Overflow Blog Services such as Google Maps cut off coverage at 85.051129° north and south. What this means is that angles between lines on the surface will not, in general, be mapped to exactly the same angles.

It only takes a minute to sign up.I have been having problems applying the different CRS systems to my layers. By using our site, you acknowledge that you have read and understand our Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Google Earth is in a Geographic coordinate System mit dem wgs84datum. The reason they deviate is because the Web Mercator specifies that coordinates be given as surveyed on the WGS 84 ellipsoidal model. Our view is set to EPSG:3857 (most of our layers are) and the other layer apparently redirects to EPSG:4326. Is there some way to 'interject' at the projection level of the layer (when defining the 'projection' from the source) to make it use EPSG:3857 instead of EPSG:4326?

I understand that google maps uses a projection called epsg:3857 to draw their tiles. Using By projecting coordinates surveyed against the ellipsoid as if they were surveyed on a sphere, angular relationships change slightly. Web Mercator (3857) will make the shapes look better, but beware if your source data is in 3857 you will have distorted area values, so watch out if you're doing anything specific to that measurement with those circles.Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Powered by EPSG database 9.8 Before we make a map suitable for printing, we need to choose an appropriate projection. Go to Project ‣ … EPSG:3857 Projected coordinate system for World between 85.06°S and 85.06°N. Web Mercator, Google Web Mercator, Spherical Mercator, WGS 84 Web Mercator[1] or WGS 84/Pseudo-Mercator is a variant of the Mercator projection and is the de facto standard for Web mapping applications. The ellipsoidal Mercator has these same properties, but models the earth as an ellipsoid. Learn more about hiring developers or posting ads with us