EPSG4326 vs EPSG3857 地图坐标系的区别
EPSG4326 vs EPSG3857（https://spatialreference.org/）
-
EPSG PROJECTION 4326 – WGS 84
EPSG:4326
WGS 84
- WGS84 Bounds: -180.0000, -90.0000, 180.0000, 90.0000
- Projected Bounds: -180.0000, -90.0000, 180.0000, 90.0000
- Scope: Horizontal component of 3D system. Used by the GPS satellite navigation system and for NATO military geodetic surveying.
- Last Revised: Aug. 27, 2007
- Area: World
Bound:[[-180,90],[180,90]]
ESRI-WKT:
GEOGCS[“GCS_WGS_1984”,DATUM[“D_WGS_1984”,SPHEROID[“WGS_1984”,6378137,298.257223563]],PRIMEM[“Greenwich”,0],UNIT[“Degree”,0.017453292519943295]]
WGS_1984_Web_Mercator_Auxiliary_Sphere
WKID: 3857 Authority: EPSG
-
SR-ORG PROJECTION 7483 – EPSG:3857 — WGS84 WEB MERCATOR (AUXILIARY SPHERE)
Projection used in many popular web mapping applications(Google/Bing/OpenStreetMap/etc).
Sometimes known as EPSG:900913.
Bound:[ –
20037508.3428, –
20037508.3428, 20037508.3428,20037508.342
8]
ESRI-WKT:
PROJCS[“WGS 84 / Pseudo-Mercator”,GEOGCS[“GCS_WGS_1984”,DATUM[“D_WGS_1984”,SPHEROID[“WGS_1984”,6378137,298.257223563]],PRIMEM[“Greenwich”,0],UNIT[“Degree”,0.017453292519943295]],PROJECTION[“Mercator”],PARAMETER[“central_meridian”,0],PARAMETER[“scale_factor”,1],PARAMETER[“false_easting”,0],PARAMETER[“false_northing”,0],UNIT[“Meter”,1]]
天地图3857
天地图4326
带参数3857
EPSG坐标系综述
EPSG，即 European Petroleum Standards Group 欧洲石油标准组织
在ArcGIS中Web Mercator有三种EPSG编号(EPSG:3857 、EPSG:102100、EPSG:102113),三者表示同一个投影，而这个投影跟谷歌和Open Street Map等使用的EPSG:900913投影是一致的.
Web Mercator 坐标系使用的投影方法不是严格意义的墨卡托投影，而是一个被 EPSG（European Petroleum Survey Group）称为伪墨卡托的投影方法，这个伪墨卡托投影方法的大名是 Popular Visualization Pseudo Mercator，PVPM。
ArcGIS10.2.2定义的GCS_WGS_1984
GCS_WGS_1984
WKID: 4326 Authority: EPSG
Angular Unit: Degree (0.0174532925199433)
Prime Meridian: Greenwich (0.0)
Datum: D_WGS_1984
Spheroid: WGS_1984
Semimajor Axis: 6378137.0
Semiminor Axis: 6356752.314245179
Inverse Flattening: 298.257223563
ArcGIS10.2.2定义的WGS_1984_Web_Mercator_Auxiliary_Sphere
WGS_1984_Web_Mercator_Auxiliary_Sphere
WKID: 3857 Authority: EPSG
Projection: Mercator_Auxiliary_Sphere
False_Easting: 0.0
False_Northing: 0.0
Central_Meridian: 0.0
Standard_Parallel_1: 0.0
Auxiliary_Sphere_Type: 0.0
Linear Unit: Meter (1.0)
Geographic Coordinate System: GCS_WGS_1984
Angular Unit: Degree (0.0174532925199433)
Prime Meridian: Greenwich (0.0)
Datum: D_WGS_1984
Spheroid: WGS_1984
Semimajor Axis: 6378137.0
Semiminor Axis: 6356752.314245179
Inverse Flattening: 298.257223563
SR-ORG:7483
EPSG:3857 — WGS84 Web Mercator (Auxiliary Sphere) (Google it)
Projection used in many popular web mapping applications (Google/Bing/OpenStreetMap/etc). Sometimes known as EPSG:900913
PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Mercator"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1]]
SR-ORG:8552
ESRI:102100 Updated ESRI Web Mercator definition as they switch from 102113. Retrieved from http://resources.arcgis.com/content/kbase?fa=articleShow&d=37329
PROJCS[“WGS_1984_Web_Mercator_Auxiliary_Sphere”,GEOGCS[“GCS_WGS_1984”,DATUM[“D_WGS_1984”,SPHEROID[“WGS_1984”,6378137.0,298.257223563]],PRIMEM[“Greenwich”,0.0],UNIT[“Degree”,0.017453292519943295]],PROJECTION[“Mercator_Auxiliary_Sphere”],PARAMETER[“False_Easting”,0.0],PARAMETER[“False_Northing”,0.0],PARAMETER[“Central_Meridian”,0.0],PARAMETER[“Standard_Parallel_1”,0.0],PARAMETER[“Auxiliary_Sphere_Type”,0.0],UNIT[“Meter”,1.0]]
SR-ORG:45
WGS 1984 Web Mercator
The ESRI definition for a spherical Mercator based upon the WGS84 semimajor axis. Will be in ArcGIS 9.3 with 102113
PROJCS[“WGS_1984_Web_Mercator”,GEOGCS[“GCS_WGS_1984_Major_Auxiliary_Sphere”,DATUM[“D_WGS_1984_Major_Auxiliary_Sphere”,SPHEROID[“WGS_1984_Major_Auxiliary_Sphere”,6378137.0,0.0]],PRIMEM[“Greenwich”,0.0],UNIT[“Degree”,0.017453292519943295]],PROJECTION[“Mercator”],PARAMETER[“False_Easting”,0.0],PARAMETER[“False_Northing”,0.0],PARAMETER[“Central_Meridian”,0.0],PARAMETER[“standard_parallel_1”,0.0],UNIT[“Meter”,1.0]]
