This post provides some excellent background on the two projections and their differences and uses.
Common terms associated with non-WGS 84 applications include but are not limited to: Web Mercator, WGS 84 Web Mercator, WGS 1984 Web Mercator (auxiliary sphere) and European Petroleum Survey Group (EPSG) Spatial Reference System Identifier (SRID) (such as) EPSG: 3857.
Defining Parameters. The discrepancy is imperceptible at the global scale but causes maps of local areas to deviate slightly from true ellipsoidal Mercator maps at the same scale. Converting geographic WGS 84 to Web Mercator 102100. The benefit the Web Mercator gains by this practice is that the spherical form is much simpler to calculate than the ellipsoidal form, and so requires only a fraction of the computing resources.The projected coordinate reference system originally lacked an official spatial reference identifier (In 2008, EPSG provided the official identifier EPSG:3785 with the official name "Popular Visualisation Later that year, EPSG provided an updated identifier, EPSG:3857 with the official name "WGS 84 / Pseudo-Mercator".Although the projection is closely associated with Google, Microsoft is listed as the "information source" in EPSG's standards.Other identifiers that have been used include ESRI:102113, ESRI:102100, and OSGEO:41001.ESRI:102113 corresponds to EPSG:3785 while ESRI:102100 corresponds to EPSG:3857.The projection covers the Earth from −180° to 180° longitude, and 85.05° north and south. 754. This change aims to support the continued use of the now ubiqituious WGS84 ensemble datum EPSG:6326 upon which it is basednternational Association of Oil and Gas Producers (After considering the relevant technical and practical challanges associated with changing web mapping products in the current standards paradigm and the critical requirement to maintain direct inter-operability with all other web mapping services and web mapping users until such time as ICSM recommends an agreed alternative that achieves interoperability. Additional references on the Web Mercator issue and the use of WGS 84 are available at the following URLs:For assistance please contact the NGA Geomatics Office (SN) using the point of contact information provided below:
Consumers of LISTmap and the web services will see no change in location / coordinates of features post 30 September 2020 - the coordinates are effectively GDA94 coordinates.Users who wish to mix and match GDA2020 datasets in a web-mapping platform will need to first transform from GDA2020 to GDA94 (i.e.
), those do use a sphere-based GeoCRS and you had to do some sort of bookkeeping transformation to convert between then. The NGA Geomatics Office reminds the community to use DoD approved World Geodetic System 1984 (WGS 84) applications for all mission critical activities.Many popular commercial visualization, mapping and mobile web device applications use a Web Mercator spherical earth reference. Otherwise misalignment of data will result and as the misalignment is approximately 1.5 metres in Tasmania it will be visually apparent at higher zoom levels.Similar to above, destop GIS users consuming LIST web services who are working in a GDA2020 project will need to apply a transformation to the WGS84 Web Mercator based web services that pivots through GDA94. It is not a recognised geodetic system: for that see ellipsoidal Mercator CRS code 3395 (WGS 84 / World Mercator). Contact listhelp for more information. The WGS 84 meridian of zero longitude is the IERS Reference Meridian, 5.3 arc seconds or 102 metres (335 ft) east of the Greenwich meridian at the latitude of the Royal Observatory..
This message outlines the risks associated with the use of Web Mercator applications for DoD and GEOINT user community operations. Using Remarks: Uses spherical development of ellipsoidal coordinates. Published in 1569 by Gerardus Mercator, the Mercator projection was created for … EPSG:3857 -- WGS84 Web Mercator (Auxiliary Sphere) (Google it) Projection used in many popular web mapping applications (Google/Bing/OpenStreetMap/etc). WGS84 published on the 'Web Mercator' projection (EPSG:3857 ) have become the de-facto standard for publishing web maps and exchanging data for … If I establish the CRS of the Data Frame to WGS84 Web Mercator, the distance between the two points is 138 meters, but if I establish the CRS of the Data Frame to WGS84 UTM zone 15N the distance is 99 meters, which is a huge difference. This deviation becomes more pronounced further from the equator, and can reach as much as 40 km on the ground. This is not a limitation for street maps, which is the primary purpose for such services. Some versions of software do not cater for pivoting around GDA94 in the transformation and in such instances the version will need to be upgraded to cater for this. future reference. Even so, they will not deviate enough to be noticeable by eye. The issues I had were caused by a different problem within my data. Converting geographic WGS 84 to Web Mercator 102100. You would just need to pick or define a transformation to convert from Ain el Abd 1970 to WGS 1984.If you're using Esri:102113 or EPSG:3785 (why?? Scope: Certain Web mapping and visualisation applications. The code above transforms coordinates from WGS84 Web Mercator Auxiliary Sphere to WGS84 correctly. Please turn JavaScript back on and reload this page.Jive Software Version: 2018.25.0.0_jx, revision: 20200515130928.787d0e3.release_2018.25.0-jx
A straight line drawn on a map in this projection provides a bearing by which one could fly a plane or sail …
For further information about dynamic datums, datum ensembles, high accuracy data and real time positioning watch this of high accuracy positioning systems which is being used in conjunction with high accuracy web deliverered spatial data has resulted in the need to updateregistry. Whilst it is the user's responsibility to consult their software support provider on this issue Land Tasmania can provide some limited information specific to some software packages.