Questions tagged [wgs84]

WGS 84 is a geodetic coordinate system, commonly referred to as EPSG:4326.

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13 views

Why is Sentinel-1 using a geographic coordinate system and Sentinel-2 a 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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1answer
687 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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1answer
13 views

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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1answer
587 views

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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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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2answers
327 views

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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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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1answer
2k views

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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1answer
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Converting (geodetic pose + cartesian offset) to geodetic position? [closed]

I am in search of an algorithm to solve the first/direct geodetic problem precisely in 3D. The input is: a geodetic (not geocentric) position (WGS84, height is above the WGS84 reference ellipsoid) ...
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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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MGI_Lambert to WGS48 UTM33 transformation problem

I tried to reproject a raster (DEM) with MGI_Lambert Projection (Austria) into WGS48 UTM33 Zone. I did it with ArcMap 10.6 using the recommended MGI_To_WGS_1984_3 transformation aswell as a ...
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1answer
68 views

Adding CSV file with lat/long to map in different CRS in QGIS

I'm very new to QGIS, so I'm sure the solution to this is common sense. I have a map in the WGS 84 zone 58S CRS and am trying to add lat/long coordinates from a text file to it. The issue: the WGS 84 ...
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2answers
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Converting Lambert Conformal Conic (LCC) to UTM

I have two numpy meshgrids (X, Y both 2D) in Lambert Conformal conic with the following information: I'd like to directly (or indirectly if not possible) project them to UTM. I have both pyproj and ...
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Convert WGS 84 Coordinates to Arc 1950 coordinates

How can I convert WGS 84 coordinates to [Arc 1950][35s] coordinates? e.g S12.14127 E25.96643 S12.23535 E25.90588 S12.23535 E25.90588 S12.23859 E25.79461 S12.27073 E25.66638
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Converting from EPSG 25833 to WGS 4326 using QGIS? [duplicate]

I have a layer of Brandenburg (Germany) in EPSG 25833 which I want to tranfrom to EPSG 4326. Similar to this answer to Transforming shapefile to WGS:84 (EPSG: 4326) in QGIS?, I set the CRS to EPSG ...
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Changing Map Coordinate System Changes in ArcGIS Pro Changes Azimuth

I am trying to create a label that will overlay a line in ArcGIS Pro, the layer is coming from a PostGIS database. The underlying materialized view for the label/symbol overlay is something like this: ...
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1answer
47 views

Land Surveyor Coordinates

I've received these coordinates from a land surveyor and no matter which converter I try or where I insert these coordinates. I really can't find them in Google Earth or any other map. If anyone ...
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Converting distance from km to degrees (WGS84)?

Is there an equation in which I can convert distance in kilometers into degrees? I am performing a Kriging analysis and when I am measuring the distance between the input points (for LAG and Major ...
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WGS84 to MSL and opposite

I am using Cesium to create point in a map. The point will be then flyable with a drone. I have the following problem, 1) The user set a point altitude to 20 meters in a 2D flat map. 2) The point ...
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1answer
127 views

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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Python script to convert Lat Long to ITM (Irish Transverse Mercator)

I am currently working on a python script that converts Lat Long (WGS84) to ITM. The formulas used are based on a paper published by OSGB (Appendix B): http://www.leica-geosystems.co.uk/downloads123/...
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1answer
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Applying the Bursa-Wolf transformation

I want to transform Gauss-Kruger coordinates into WGS84 coordinates by applying the Bursa-Wolf transformation. I know the Bursa-Wolf parameters for the desired transformation. What confuses me is that ...
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1answer
427 views

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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1answer
35 views

Proj4 give always a false answer [closed]

I'm trying to use Proj4 (dll) to convert from Lambert93 to WGS84 but it always give a wrong answer: // EPSG:2154 : Lambert 93 definition: https://spatialreference.org/ref/epsg/2154/proj4/ const char*...
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1answer
100 views

Converting from UTM to WGS84 using GeoTools?

I have created a function that reads a shapefile file and I get its geographic coordinates well. This works fine. My problem is that I need those coordinates in wgs84 format (latitude, longitude), but ...
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1answer
452 views

Formula to convert xyz Cartesian to latitude / longitude using WGS84 [closed]

I need formula to convert xyz Cartesian coordinates to latitude,longitude,altitude using WGS84 to use in VBA application x,y,z coordinates will be normal points (lets say, user pick point in AutoCAD, ...
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1answer
113 views

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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1answer
145 views

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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409 views

Converting vector in NED to ECEF? [closed]

I have a geodetic WGS84 position, lat, lon, alt, and direction cosines from the same point, uN, uE, uD. I'm brand new to geodetic/ecef conventions. How do I take a vector (say, a unit vector with ...
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54 views

Transform ellipse representation from major/minor (meters) to degrees

I am given an ellipse represented by a quadruple (major, minor, center, azimuth) where major,minor are the ellips's axis length in meters, the center is the WGS84 coordinates of the ellipse's center ...
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571 views

GeoTools: SimpleFeatureCollection to KML error CoordinateReferenceSystem

I want to export a SimpleFeatureCollection (Read from a MySQL DB) to a KML file, here is my code used to read the infos into the console: private void featureCollectionToKML(SimpleFeatureCollection ...
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0answers
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Error while converting WGS84 => Albers-Siberia by ogr2ogr [duplicate]

While converting from one geosystem to another polygons crossed by 180 meridian left got split into eastern and western parts. Tool used - ogr2ogr library. Initial geosystem - WGS84, target - Albers-...
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2answers
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How to convert the SRTM DEM orthometric to ellipsoidal heights using ArcGIS or others GIS?

Recently I got the SRTM DEM from Cgiar,which based on WGS84/EGM96. and I merged the tiles to one tiff file. I want to get the WGS84 ellipsoidal heights. According the steps from the Arcgis Help 10.2 ...
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215 views

How to calculate OSM WGS84 Lat and Lon to meters in C++?

Summary I am converting OSM coordinates into X and Y values with accurate distances in meters between all points using c++. The calculations/code I am using is resulting in an incorrect ratio/scale ...
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53 views

Scaling WGS84 coordinates?

I know this is a weird question, but I would like to know if it is possible to construct a proj4 string so that I can use proj4 to convert from WGS84 to a "scaled" WGS84 system. For example with a ...
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Stereographic projection of WGS84 ellipsoid [closed]

According to this source, an optimal projection for small, roughly square areas is the stereographic projection. The wikipedia page of the stereographic projection shows how to convert from spherical ...
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1answer
63 views

Converting WGS84 to ETRS89 in ArcGIS Desktop?

I have a data which has no projection and has WGS84 as a coordinate System. I need to Import this data and Analyse it other data which have ETRS_1989_UTM_Zone_32N as a projection System. I have ...
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4answers
4k views

Looking for a pythonic way to calculate the length of a WKT linestring

I was quite unsatisfied with Calculating Length of Linestrings in WGS84 in Miles. It kept me wondering if there is a more convenient, Pythonic way to calculate the length of a WKT linestring according ...
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1answer
135 views

Re-projecting WGS84 to OSGB in SAGAGIS

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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209 views

Converting L.GeoJSON Leaflet to different projection?

so I have some awesome basemap raster layers that use L.TileLayer to load, but the GeoJSON I have for my country polygons is all Web Mercator. My tile map is WGS84 or EPSG4326 (I think). But I ...
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1answer
92 views

Procedure of transforming coordinates?

I'm trying to understand the math behind this transformation. I should note that I've been able to perform the transformation using GeoPandas, but I'd like to understand what is going on under the ...
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1answer
158 views

Geographic Transformation in Alaska Between NAD83 (NSRS 2007) and WGS84

This is a related question to this one asked ~3 years ago: Geographic Transformations in Alaska Between NAD83 and WGS84 We are currently on ArcGIS Desktop 10.4.1 What is the best geographic ...
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3answers
1k views

Translate Cartesian coordinates to WGS84, preferably in pyproj?

I have some Cartesian coordinates: x = 3862525.511 y = -109738.522 I need to translate them into WGS84 coordinates, preferably using pyproj. Is this possible, or have I misunderstood the nature of ...
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1answer
215 views

Treating latitude/longitude as a pair of polar coordinates

I have latitude longitude coordinates covering the whole globe that I wish to perform arithmetic operations (mean, interpolation) on without concern for ambiguous points and wrap around and without ...
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1answer
58 views

Accuracy of ST_Contains on geometry column with WGS84 data

Apologies if this has been asked before; I found some similar questions (this mailing list post was particularly interesting: https://lists.osgeo.org/pipermail/postgis-users/2008-June/020353.html) but ...
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1answer
77 views

Why can't I reproject geopackage layer from WGS84 to ETRS89/UTM (QGIS3.6)

I accidentally digitized a layer (geopackage) in WGS84 (EPSG 4326). Now I need to reproject it into ETRS89/UTM zone 32N (EPSG 25832). I tried it in different ways which usually work without a problem (...
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1answer
77 views

CRS conversion of a point from Pulkovo 1952 (58) Stereo70 (ESPG 3844) TO: WGS84 (ESPG: 4326)

I have a shapefile loaded from delimited text with exact Northings and Eastings in the Romanian CRS (ESPG:3844). The layer CRS is correctly defined. Meanwhile, my project CRS is WGS84 (ESPG 4329). ...
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1answer
269 views

Translating WGS 84 datum to mean sea level?

I'm very new to GIS so here my question is I have WGS84 DEM data for my country and I want to calculate the sea level rise. I will use QGIS raster calculator, my problem is I need to find sea level ...
2
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1answer
343 views

Google Earth Engine scale definition and export

I am trying to download Global Surface Water (Pekel et al 2016) data from Google Earth Engine. It has a specified maximum spatial resolution of 30 [presumably meters]. When I export the data ...