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Questions tagged [wgs84]

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

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Conversion problem from Lambert93 to WGS84 - R

I am dealing with IGN shapefiles of french "communes" that are in Lambert93 projection. temp <- readOGR(dsn = chemin) temp@proj4string which gives CRS arguments: +proj=lcc +lat_1=44 +lat_2=...
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Gauss Kruger to WGS84

I have to transform Gauss Kruger coordinates to WGS84 in my software application. I'm using the Java library of PROJ4 to do that. For Gauss Kruger, I always use EPSG:31466 and for WGS84 EPSG:4326. ...
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Converting EPSG 32639 to WGS 84 using Proj.Net gives wrong coordinates

I've used Proj.Net in my c# application to convert from UTM 39N to WGS 84 as below: private const string wkt32639 ="PROJCS[\"WGS 84 / UTM zone 39N\",GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"...
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1answer
59 views

Features in projection are tiny

In QGIS 2.18.7 I want to change the projection of my shapefiles into a form that preserves distances for the sake of analysis. But when I do this from WGS84 to "WGS84 UTM zone 48N" or "south asia ...
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1answer
116 views

WGS84 to EPSG:20007, Pulkovo 1995/ Gauss Kruger zone 7

I have a shapefile drawn in Selected CRS EPSG 84, when I try to load it in my project in Pulkovo 1995/ Gauss Kruger zone 7, its missplaced, and when i change shapefiles crs in properties, still no ...
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What WGS84 epoch date is used by Google Maps

I have some Nad83 data that I want to overlay on Google Maps. This article by ngs.noaa.gov explains translating from nad83 to wgs84 better than anything I have read. If I were to use a tool like the ...
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Converting 9319106.045445956 in unknown coordinate system to WGS84? [duplicate]

From some API I'm receiving latlng coordinates in a stranger format: x: 9319106.045445956, y: 7020308.253131529, I don't know what it is, but my map module works only with WGS84 coordinates: lat: 53....
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2answers
510 views

Why are conversion results from proj.4 inaccurate?

I want to convert a Gauss-Kruger coordinate (EPSG::31467) into a WGS84 coordinate (EPSG::4326) using proj.4. The problem is that the output from proj.4 is very, very inaccurate. Consider the Gauss-...
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1answer
1k views

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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Why does WGS84 refer to so many different things?

Sounds like a stupid question, but I've been struggling with this. Here's a diagram of the structure for EPSG 4326 - the geographic CRS known as WGS 84. Here we have WGS 84 (a CRS), World ...
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464 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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2answers
724 views

Georeferencer QGIS not working?

I am trying to georeference a .png file. After inserting all the data I get the following error "Transform Failed: Failed to compute GCP transform: Transform is not solvable." What can be the ...
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1answer
396 views

Converting long, lat to tile of NASA GIBS - WGS 84 / Lat-lon / Geographic (EPSG:4326)?

I'm following GIBS API for Developers and I need to convert long, lat of POI to col and row of tile for given zoom. For example to get right tile in endpoint like: https://gibs.earthdata.nasa.gov/...
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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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1answer
124 views

Calculating imprecision introduced by using WGS 84 coordinates as x,y in raster?

I have several coordinates provided in WGS 84 which I need to rasterize. For that purpose I simply interpret the lat,lon coordinates as x,y coordinates and I apply some scaling. So e.g. anything in ...
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1answer
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Why does Pyproj fail converting lon lat alt to ECEF?

I'm trying to convert a WGS84 lon, lat and alt to ECEF and Pyproj is giving me really weird results. My code is simply: lon, lat, alt = 49.74761271, -113.2179781, 0 ecef = pyproj.Proj(proj='geocent', ...
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gdalinfo corner coordinates off file

When running gdalinfo on an SRTM file, I get the corner coordinates. However, when I attempt to get the elevation at those coordinates using gdallocationinfo -wgs84 file.hgt {corner coordinates} I get ...
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WGS84 with elevation z [closed]

I need to define a data structure which for convenience reasons for users using my software should be related to WGS84 - if possible. So that it makes it easy for users to use my software, convert ...
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3answers
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Performing QGIS Datum Transformation from WGS 1984 to NAD 1983?

Is there a way to transform a shapefile's datum from WGS 1984 to NAD 1983 in QGIS 2.18.0? In the picture I have attached, the green dots are points that were collected in the field using a Trimble ...
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1answer
137 views

Calculating distance between coordinates from point to a box?

I have two different WGS84 coordinates, A and B. A is just a (lat,lon,z) point and B is a (lat,lon,z) point inside the center of a box with the dimension height, width, depth (in meters). I need to ...
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1answer
222 views

Converting from Sweref99tm to WGS84

I have a lot of coordinates I want to convert from Sweref99tm to WGS84 for display on google maps. I'm using gdal installed on my laptop: $ echo "6782384 599140" | gdaltransform -s_srs EPSG:3006 -...
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Converting WGS84 to ECEF in Python?

I am trying to convert some coordinates geodetic coordinates (WGS84) to ECEF. I've tried my own implementation in Python and using pyproj and am getting difference results. Could someone please help ...
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556 views

When is data created in datums other than WGS84?

I'm trying to understand why we need datums other than WGS84. Since GPS coordinates are relative to the WGS84 ellipsoid what is the advantage of having other datums like for example NAD83. I ...
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1answer
2k views

Transforming UTM layer to WGS using QGIS?

I am trying transform a UTM layer to a WGS. I have already: Saved it as a new layer changing the SRC Tried the tool "define current projection" I am using QGIS 2.14 and the original layers are in ...
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1answer
462 views

How can I improve alignment between google maps and overlays coming from a different coordinate system?

After some work, I managed to extract some PNGs out of a GIS we have at work. This GIS has some polygons in which addresses are surrounded by them. I managed to create an extractor in Python and to ...
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Shapely polygons crossing the antimeridian

Sample data Consider the following WKT Polygon, crossing the international dateline (antimeridian): POLYGON((176 49,-65 49,-65 11,176 11,176 49)) And the following points: POINT(-140 32) # ...
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257 views

Transforming azimuthal to wgs projection using Python?

I want to plot a circle around a given lat/long with a certain radius on the Earth. The shapefile of the earth has WGS84 coordinate system. First, I projected the circle to azimuthal equidistant map ...
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964 views

Convert locations from ECEF NED (local coordinate system) to WGS 84 (global coordinate system)

I track relative positions to known fixed reference location (Lat/Lon/Alt on WGS 84). Which means Location_0 is the above reference location, and Location_i is something like (X,Y,Z) relative by ...
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309 views

Plotting latitude and longitude coordinates (from Bing Maps) in ArcGIS [duplicate]

I have an excel spreadsheet containing latitude and longitude values for a set of businesses. I want to plot the businesses in ArcMap. I was told the latitude and longitude values were obtained from ...
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1answer
1k views

How to convert a huge database of ED50 coordinates into WGS84?

As the title says I have a huge database containing (among other data) a pair of coordinates using ED50 standard for each record. I'm tasked to update the whole thing and convert all the ED50 entries ...
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231 views

a localised 2D coordinate system from GPS coordinates

I spend a few days reading about coordinate systems, map projections, datums, etc. Since I am new to gis, I am not confident I am doing this right. Problem at hand: I have a GPS device that gives ...
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2answers
319 views

Fix leaflet script in order to change coordinate projection

I have a leaflet script which using ziped shapefiles to add it on the map. The shapefiles are in epsg projection 31700 (dealul piscului 1970) and the position on the openstreet map is not correct, so ...
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Geotools: unexpected difference between CRS.decode(“EPSG:4326”) and DefaultGeographicCRS.WGS84

I wanted to use geotools (15.3) to reproject data from EPSG:4326 to a local projection. To see if everything works as expected I printed the length of two test linestrings. The expected result is ...
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1answer
138 views

Reprojecting points in NAD 1983 to LLA (WGS84)?

I've read documentation about using NAD_1983_To_WGS_1984_1 for the entire North American continent or NAD_1983_To_WGS_1984_5 for the 48 contiguous United States but what I'm confused is how can I use ...
2
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1answer
70 views

multiple glitches in rendered rasterfile after reprojecting in QGIS

I reprojected a natural earth raster file (Natural Earth II with Shaded Relief, Water, and Drainages, CRS WGS84) with a costum CRS (azimuthal orthografic) using Raster->Projections->Warp in QGIS. ...
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1answer
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QGIS project crashes when project CRS is changed and all layers are activated

My QGIS project has four vector layers, three of them are from the NaturalEarth dataset (countries, regions and ocean layer). The other two are shapefiles for plant locations and plant names. Whenever ...
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1answer
360 views

How does a Spatial Reference System change the underlying geoid without having to update coordinates?

Reading Wikipedia on WGS84 I see this, Currently, WGS 84 uses the EGM96 (Earth Gravitational Model 1996) geoid, revised in 2004. This geoid defines the nominal sea level surface by means of a ...
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How does a Spatial Reference System like WGS84 have an elipsoid and a geoid?

I found out that WGS84 is an ellipsoid with a "geoid component", but I'm unsure exactly how that can be. This is from PostGIS in Action, Second Edition (pg. 64), but it seemed a bit vague. ...
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0answers
77 views

Raster reprojection in QGIS leads to different results

I have a base ASTER 30m raster map from which contours have been extracted / reprojected to UTM using different processes in QGIS 2.14: ASTER (WGS84) > save raster as using Project CRS (UTM) > ...
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2answers
429 views

How to change Datum to WGS 84?

I have a shapefile with following projection information: PROJCS["kl2",GEOGCS["kl3",DATUM["D_Everest_1830",SPHEROID["Everest_1830",6377299.36,300.8017]],PRIMEM["Greenwich",0.0],UNIT["Degree",0....
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2answers
387 views

Converting PLUTO coordinate reference system in QGIS?

I am using New York's PLUTO lot data in QGIS for a project. Right now, the shp file automatically imports with a custom CRS, allowing it to visually line up with a separate layer of subway entrances ...
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1answer
323 views

Leaflet JS: Tiles misaligned using WMS resource

in Leaflet JS I instantiated a WMS tile layer object, given a base URL of the WMS service. The wms service projection system is EPSG:32633 (WGS 84 / UTM zone 33N) and I had to use proj4js to project ...
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Which is the most accurate method of measuring distance?

I aim to analyse the accuracy of the various methods of geodesic calculations (distance between two points on Earth)based on the three assumed models of Earth - flat, spherical & ellipsoidal. I ...
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2answers
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Using a geotagged jpg in the WGS coordinate system

I am working on software for mapping purposes and ran into a projection issue that is beyond my knowledge of GIS. The software utilizes longitude latitude for all visual mapping in order to maintain ...
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1answer
492 views

WGS84 to OSGB36 relative accuracy

I have dGPS positions collected using a Leica 1200 system (base station and rover) recorded at the same site on multiple occasions over two years (being used to georeference terrestrial laser scanner ...
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2answers
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How does QGIS calculate distances when the data is not projected (WGS84)?

I am playing a bit around with Qgis 2.14.6 to understand how it deals with distance measurement. I took a line-shapefile that I saved in 3 different coordinate systems (4326, 32642 and a national one ...
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1answer
2k views

Transformation Parameters from ETRS89 (2004) to WGS84

I have XYZ coordinates of a point measured in year 2004 in ETRS89 coordinate system and I need to transform it to geodetic coordinates in WGS84. Since ETRS89 changes yearly, so do the transformation ...
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1answer
765 views

R: Return the UTM zone that a WGS84 point belongs to

I'm looking for an R function that might work similarly to this website that will tell you what UTM zone your WGS84 point belongs to. http://www.rcn.montana.edu/resources/converter.aspx
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Convert from EPSG:27700 to latitude and longitude

I'm trying to transform EPSG:27700 coordinates to latitude and longitude. From my research I understand that WGS 84 (EPSG:4326) is the SRS that resembles latitude and longitude. I'm using Proj4j to ...
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1answer
137 views

Issue converting projected coordinates to wgs1984 in Postgis

I'm trying to convert a local PCS (city of Buenos Aires) to wgs1984. Since the PCS is not included in Postgis, I added it to spatial_ref_sys using spatialreference.org (I compared the arguments with a ...