Questions tagged [wgs84]

WGS 84 (that spelling) is the name of an ellipsoid (EPSG::7030), the name of a geodetic coordinate reference system (EPSG::4326), and the alias of a datum (EPSG::6326), official name World Geodetic System 1984. WGS84 (no space) is the alias of the ellipsoid (EPSG::7030). WGS 84 is most commonly used to describe the coordinate reference system.

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How convert HangZhou coordinate systemto WGS84?

I found some parameters, but don't know how to use them: The Center points is 120°09′33″.04E,30°14′48″.07N and the direction angle is 07°56′20″.17 . And how to convert a x,y to Longitude,latitude, ...
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Difference of Assign projection, Reproject Layer, and Define layer projection in QGIS?

I have a point layer and a polygon layer that are all in UTM51N projection but do not align. Just want to know when should I use Assign, Reproject, or Define. Experimented with a polygon in EPSG:4326 ...
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Calculating cell size for raster when analyzing area not at equator using ArcGIS Desktop [closed]

How do I calculate the 'correct' cell size for a raster when analyzing an area not at the equator? My goal is to project a land cover raster provided in GCS WGS84 to an equal area projection and '...
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Bringing in KML into Google Earth with different Coordinate System

I have a shapefile (in red outline bellow) that has the following attribute: Projected Coordinate System: NAD_1927_StatePlane_Wyoming_East_Central_FIPS_4902 Projection: Transverse_Mercator But when ...
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OSGB36 to WGS84 reprojection 'error' [closed]

I am a recent convert to QGIS. I have surveyed (and corrected) DGPS (vector point) data collected to OSGB36 (British National Grid); these positions match acceptably well with the OSGB36 map layers ...
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R: Why is my map including the entire world WSG84 space, when all I want plotted is New Zealand?

This seems to be a very easy problem to solve, but about two hours of searching hasn't led me to the answer. I have a GIS file that I downloaded in WSG84 ESPG:4326. I read in the file using readOGR. ...
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Performing Esri NAD27 to WGS84 datum transformations with ST_Transform in POSTGIS

I am trying to align with some data points that have been projected in Esri from NAD27 State Plane feet (SRID=32026) to Lon/Lat using the "NAD_1927_To_WGS_1984_6" datum transformation using ...
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How to get square metric pixels for a GeoTiff, whose pixel spacing is given in degree?

I have received a GeoTiff file, whose pixel spacing is provided in degree (e.g. +1° to the right, -1° down). Of course, this means that the actual, metric pixel spacing changes in relation to the ...
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Calculating area in the attribute field of a QGIS 3.4.3 project with multiple CRS

The area calculations in my project derived from the attribute field show values way below actual area, because the attribute field assumes the project CRS (EPSG:3857). However, this CRS should remain ...
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Buffering geometry with points in WGS84 using shapely?

I have a polygon in python shapely that I would like to buffer with a 100 foot buffer. If the polygon is stored as a series of WGS84 lon/lat points how would I go about calculating the distance of ...
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Calculating minimum distance in meters of two polygons (defined in lat/long coordinates)?

I'm new to GIS and I'm a bit lost in the terms and concepts, so I'm not sure I'm asking a valid question, but I need to calculate the minimum distance (in meters) of two polygons which are defined in ...
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Convert relative coordinates into absolute ones having only one absolute coordinate in QGIS

I have a layer of points with relative altimetric heights from a survey carried out with a Differential GPS. I know the absolute coordinates of only one point (EPSG:4326 WGS 84 ), the other points ...
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Long,lat from raster x,y

I have downloaded a map file which I'm using as a texture on a plane. The file is a proper map file with projection in a prj-file and a tfw-file. The prj file contains: GEOGCS["GCS_WGS_1984",DATUM["...
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Transformation problem WGS84 (EPSG:4328) and ETRS89 (EPSG:4258) in QGIS

I want to transform vector points from EPSG:4326 to EPSG:4258 and vice versa for survey application. Currently the difference between the two is about 70 cm in xy direction. Using QGIS to transform ...
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In a software application displaying latitude & longitude, should N/S/E/W be localised?

In English software, it's conventional to render WGS 84 co-ordinates in a manner similar to the following: 38.8951° N, 77.0364° W or, encoding the directionality into the numeric values: ...
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Merge geojson polygons with WGS84 coordinate

I have a Geojson file with some adjacent polygons and I want to merge them into one. I know it's a recurrent question but I can't find information for polygons with latitude and longitude coordinates ...
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Create Fishnet issues with measurement distance

I am trying to create a regular soil sampling grid based upon digitised field extents. I had posted a previous question today relating to issues with coordinate systems and displaying the sample ...
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Exporting GeoPackage layer to GeoJSON changes CRS from WGS 84 EPSG:4326 to OGC:CRS84

I'm attempting to convert a polygon layer from GeoPackage format to GeoJSON in QGIS 3.10.1. The original layer has a coordinate reference system of WGS 84 (EPSG:4326) which is what I need. Yet the ...
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Published Map Services in SRID 4326

I've been tasked with creating webservices of individual layers in Portal for ArcGIS. The data itself is stored in SQL Server in SRID 4326 (WGS84 unprojected). I'm wondering if it's a better idea to ...
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WGS84 expressed in meters - default projection in ArcMap

I am trying to identify the correct coordinate system for some data, with x and y expressed as (for example, data located roughly in the UAE): 6,220,199; 2,742,099 I haven't come across these 7-...
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Gaussian Lat-Lon Grid to WGS84

I have some grib files from ECMWF ERA-Interim Reanalysis in which all the data are projected onto the N128 Gaussian grid (256 points of latitude x 512 points of longitude, https://www.ecmwf.int/en/...
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Converting NAD83 (epsg:4269) to WGS84 (epsg:4326) using pyproj

I'm trying to convert US census data (NAD83) to WGS84. I know the difference between the two is quite minor, but trying to apply the transformation using pyproj does not do anything. e.g.: from ...
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How to reproject raster image from WGS84/Pseudo-Mercator to ECEF to ENU in python? [closed]

I am new to GIS and I am writing a program that should work with a cartesian coordinate system, ENU. Therefore my plan is convert all point coordinates from WGS84/Pseudo-Mercator to ECEF and then to ...
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Java - Conversion from NAD27 to WGS84

I'm in the process of adding automatic CRS conversion to a Spark application and running into some problems with the implementation. Each row in a dataframe that is being converted will contain ...
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118 views

MySQL 5.7 and how to store WGS 84 Coordinates

I want to store WGS84 coordinates in a MySQL 5.7 database. After much reading, I think I should use the POINT datatype with a SPATIAL INDEX. But I am very confused about SRSs, SRIDs, lat/long vs long/...
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Re-projecting WGS84 to OSGB in SAGA GIS

I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I ...
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GCS Sphere EMEP vs GCS WGS 1984

NOAA provides QPF data on rainfall in the form of shapefiles. The shapefiles include .prj files with information on the coordinate system used: GEOGCS["GCS_Sphere_EMEP",DATUM["D_Sphere_EMEP",SPHEROID[...
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Cartesian coordinate convert to WGS84?

I am lost by various coordinate systems. This problem may be simple for you, but I still have no idea. A point P which WGS84 coordinate is (a, b, c). a, b, c represents longitude, latitude, altitude, ...
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408 views

WGS84 to MSL and opposite

I am using CesiumJS to create point in a map using World Terrain to get the elevation of my points. The point in Cesium are using WSG84. When I calculate the altitude using sampleTerrain I retrieve ...
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WSG84, GPS, GEOID and other altitudes

INTRO A bit of tool introduction, but the problem is not related to this directly. I have an app in CesiumJS. I am using Cesium World Terrain, and get altitude using Sample Terrain Most Detailed ...
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Height of the geoid in ECEF coordinates

I know that the relationship of geoid height N and ellipsoid height h to orthometric height H is defined by H = h - N, but what if I have some position in Earth-Centered-Earth-Fixed (ECEF) coordinates?...
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Is height conversion between ellipsoids necessary?

I have measurement data that uses X/Y in different zones of JGD2011 and an ellipsoid height above GRS1980 (but it also includes a geoid height as well). My task is to transform this data to "WGS84 LLA"...
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Lat/Long co-ordinates are not plotting onto EPSG:3857 OSM basemap correctly

Excuse me if this is a stupid question, but I've honestly tried to find the answer in a few threads here on SE, and I cannot seem to follow the suggested steps correctly. Project is in EPSG:3857 (...
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Transforming coordinates between wgs84 and UTM ED50 31N

I must tranform a point cloud from wgs84 (geographic) to UTM (projected) ED50 for zone 31North. I have several free webs who offer me this service, and the answer is slightly different on every one ...
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Reprojecting MODIS Swath data to WGS84 using GDAL [closed]

Im new to GIS and now working with MODIS04L2 Aerosol Optical Thickness image. I need to reproject the image to other coordinate system such as WGS84 for later work but now Im stuck with it. I have try ...
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Projection Error with Google Maps Basemap

I have a shapefile of building lots in Manaus, Brazil, that I have re-projected into the WGS84 (EPSG:4326) CRS using the "project" tool in ArcGIS. I am now working in QGIS, and am trying to add the ...
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Are these glitches in my map rendering caused by not projecting WGS84 coordinates to Cartesian?

I'm attempting to render continental geometric data stored within an R-Tree in a SQlite database. The data is store as long/lat WGS84 and I'm trying to render it to 256px PNGs for displaying on a ...
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How do you convert SRTM HGT elevations from WGS84 into meters above sea level?

I am building a JavaScript script that reads binary HGT files - as generated by the SRTM - and converts the data into bitmaps viewable in your browser. You can try out the script and view the source ...
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Generating polygon representing rough 100km circle around latitude/longitude point using Python?

Given a latitude/longitude point anywhere on earth, I would like to assemble a polygon that roughly resembles a circle with a 100km radius around that point. It doesn't have to be pin-point accurate, ...
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What are the units for MapPoint M value with spatial reference WGS 84? [closed]

Is this something I can convert to miles or meters? What is the equation?
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QGIS 3.6.1 problems with CRS

After I have created a new QGIS project, the project CRS is set automatically to WGS84 (EPSG:4326 - WGS 84 - Geographic). The layer (.shp) which I loaded to the project has already a predefined CRS (...
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696 views

Conversion From Transverse Mercator To Longitude & Lattitude

I have to transform (7-parameters datum transformation) coordinates from northings & eastings to lattitude & longitude. Following are details of source coordinate system(i.e. northings & ...
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Difference between WGS84 and EPSG:4326?

What is the difference between WGS84 and EPSG 4326? It seems like for a given dataset it might be both WGS84 and EPSG:4326.
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Determine in Python if point is within a WGS84 polygon intersecting 180th meridian

I have a Python list of WGS84 points. Connecting these points together, we get two polygons on the WGS84 model of the Earth. I am interested in the smaller polygon which can possibly intersect 180th ...
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Why is Sentinel-1 using geographic coordinate system and Sentinel-2 projected one?

I was wondering if there's any particular reason for Sentinel-1 to be georeferenced to WGS '84 (a geographic coordinate system), while Sentinel-2 is using UTM (a projected coordinate system). I couldn'...
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Plotting great circle lines in Cesium (just getting started)?

How does one plot Great circle lines in Cesium (3D, not 2D) using the WGS84 ellipsoid? I found something like this in another thread but I'm having trouble applying it to my application (simply ...
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Incorrect false northing in pyproj?

I am using version Rel. 5.2.0, September 15th, 2018 on OSX but get the same answers on other platforms with other versions. prompt> echo 3 0 | proj +proj=utm +zone=1 +ellips=wgs84 500000.00 ...
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QGIS Transforming from ETRS89 to WGS84 - why are Helmert parameters 0?

If ETRS89 (EPSG:4258) is tectonically fixed and WGS84 (EPSG:4326) isn't, the Helmert coefficients shouldn't be zero, right? In fact these parameters should diverge more and more with every new release ...
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What are the map units that WGS84 uses?

I'm using a tool in QGIS where I'm creating points in a grid and I am specifying the points to be created every 0.5 of the user-defined atlas size. In other words, 0.5 map units of the CRS. What is ...
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Drawing arc by centerpoint, radius and azimuth in KML?

How do I generate lon/lat coordinates for an arc/sector? Coordinates can be used/filled into a KML file. Pointers to geometric formula or a program applying the formula are sought. Radius is 2 km ...

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