Questions tagged [wgs84]

WGS84 is a geodetic coordinate system, the World Geodetic System 1984 (EPSG:4326).

Filter by
Sorted by
Tagged with
3
votes
1answer
3k views

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 ...
0
votes
1answer
1k views

Projection Transformation from ETRS89 LAEA to WGS1984?

I am having difficulties to transform a Shapefile in ArcGIS 10 from ETRS 1989 LAEA to WGS 1984 N33. I have 2 files: in WGS1984 N33, with a grid of 10x10km, in ETRS 1989 LAEA, with small 100x100m ...
1
vote
1answer
84 views

Measuring different values in latlong Geotiff whether OTFR enabled or not

I'm using a GeoTiff file in QGis that has no projection per-se (it uses lat-long coordinates) and WGS84 datum. Further it has an x pixel size of 2.40475e-07 degrees and a y pixel size of -1.99028e-07.....
1
vote
0answers
230 views

How to choose a projection for area measurement on building to continental scales?

I have many geographical objects described as polylines, polygons, multipolygons. All objects are in WGS84. Object could be: a building, stadium, park, street, highway, city, state, even country and ...
1
vote
0answers
397 views

Converting a geocentric latitude to a geodetic latitude [duplicate]

I'm working with a 3D model of the earth (WGS84). The input to my problem is a geocentric lat-long. Is there an efficient way to convert this to a geodetic lat-long? My initial attempt to solve ...
2
votes
1answer
5k views

How do I convert WGS84 to Lat, Long to Google Maps in R?

I have this coordinate which I believe it's in WGS84 format x=1005740.867110, y=243957.356623 I want to plot that in Google Maps which I need to convert that to Lon, Lat. I've found this script ...
2
votes
3answers
4k views

Calculating Mercator coordinates from lat/lon

I am new to GIS but I am working on a project mapping a building using floor plans and JOSM. Using the PicLayer plugin I added the .png floor plan as a layer. I wrote a .cal file to set the scale, ...
3
votes
1answer
1k views

Conversion of 3 degree UTM zone Easting Northing to WGS-84

In Nepal we use 3 degrees width zone UTM with 3 central meridians 81 E, 84 E and 87 E and datum: Everest-1830. I am trying to convert the Everest-projected coordinates to WGS-84's Latitude and ...
1
vote
0answers
128 views

WGS84 to OSGB, using VB script

I have adapted someone else's VB code to convert lat long to OSGB for UK locations. In essence my code converts a Google API location returned from a text search, into Eastings and Northings that can ...
4
votes
3answers
583 views

Why is ST_Distance_Sphere using WGS 80?

PostgreSQL's ST_Distance_Sphere function calculates the distances on earth: float ST_Distance_Sphere(geometry pointlonlatA, geometry pointlonlatB); In its documentation, there is a peculiar note: ...
3
votes
1answer
1k views

DotSpatial problems with reprojecting shapefiles

I have a shapefile with this projection: PROJCS["RD_New",GEOGCS["GCS_Amersfoort",DATUM["D_Amersfoort",SPHEROID["Bessel_1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0],UNIT["Degree",0....
2
votes
2answers
1k views

PostGIS - How to calculate linestring length from WGS84 after transforming from OSGB 36

I am having problems getting lengths from multilinestrings after transforming data from EPSG:27700 - OSGB 1936 / British National Grid to EPSG:4326/ WGS 84. I'm doing this conversion to import a ...
2
votes
1answer
880 views

WGS84 conversion to EPSG:3067

I'm trying to convert coordinates from WGS84 to EPSG:3067 with proj4js and Openlayers, but can't get the conversion right. When I run proj4('EPSG:3067',[-24.9993393, -60.184716]); it gives [-2143537....
1
vote
1answer
490 views

Using proj to convert EPSG:2263 to WGS84

I have input data in EPSG:2263 with X and Y coordinates such as: X,Y 987043,206407 982441,212359 990907,209020 (these locations are within NYC). I need to convert these to WGS84. Using QGIS if I ...
1
vote
1answer
630 views

Convert shapefile to WGS84 [duplicate]

I have a shapefile with shapelength and shapearea, and would like to convert to WGS84 to use with ggmap. Eventually, I would like to get plot google map of individual regions of the shapefile, and ...
0
votes
2answers
2k views

MODIS-Sphere to WGS84 coordinate system in ArcGIS [duplicate]

I want to overlay two global raster datasets on land use which use different coordinate systems (MODIS-Sphere & WGS84) using ArcGIS Desktop. There seems to be no direct transformation option from ...
2
votes
2answers
811 views

Projecting shapefile with unknown CRS to WGS84 using QGIS?

I've tried setting QGIS to on the fly, changing the layer settings, nothing. I'm at a lost cause. Although I am not a GIS professional. http://www.ecaidata.org/dataset/spanish-and-mexican-land-...
1
vote
1answer
295 views

QGIS WGS84 issues

I potentially have a problem with my QGIS project, where I am attempting to digitise a relatively small map, and part of the project requires a calculation of the area of each of the parcels of land ...
3
votes
1answer
141 views

What system do these coordinates use? (from LinkedGeoData.org)

I have extracted these coordinates from geolinkedata And I don't know what system they are using: (-15.4400797 28.131791000000003) What I know is that they correspond with these WGS84 Coordinates: (...
2
votes
0answers
283 views

Auto-Sanitizing illegal PostGIS WGS84 (lat, lon) coordinates

I have just stumbled upon what seems to be a very curious behaviour by PostGIS. The XYZ point -117.0, 32.0, 0 in WGS84 (SRID 4326) is legal: items=> SELECT st_y(st_geomfromtext('POINT Z (-117.0 ...
2
votes
1answer
2k views

Using Redfearn's formula to convert between WGS84 and UTM?

I have GPS data at 1 point per second for several weeks in WGS84 latitude/longitude form. It was collected using a UBLOX GPS in 2015 in Australia (Zone 55s) Would it be correct to use Redfearn's ...
5
votes
1answer
2k views

How to convert Chinese Beijing 1954 coordinates to WGS84

I have a series of coordinates for locations in Sichuan Province China that I need to convert so that I can use them in Google Earth. The coordinates are "1954 Beijing coordinates system" and show up ...
1
vote
1answer
87 views

Satellite image vertically squeezed after being georeferenced

I am using ArcGIS for Desktop 10.1. I am trying to georeference a Google Earth image in Christchurch area, New Zealand. I am using some CGPs I have got from this image (their Google Earth coordinates),...
1
vote
1answer
4k views

Formula for converting SWEREF99 to WGS84?

I have a few hundred rows of data with sweref99 coordinates that I want to plot using Fusion Tables on Google Drive. What formula can I use to convert the two columns of Sweref99 x and y coordinates?...
1
vote
1answer
2k views

Difference between WGS_1984_UTM_33N and GCS_WGS_84

What is the difference between: a map that has a projected coordinate system of WGS_1984_UTM_33N, a geographic coordinate system of GCS_WGS_1984, and a datum of D_WGS_1984 a map that has no projected ...
0
votes
2answers
209 views

QGIS Raster clipper not working on reprojected layers?

I try to clip a hillshade raster and I get this error. The hillshade was the result of a reprojected DEM from WGS84 to WGS84UTM. When I to clip the hillshade or even the reprojected DEM, I get the ...
5
votes
2answers
5k views

Making Fishnet that is specific size in square meters on ground?

I have a raster image in GCS WGS 1984. For sampling I want to take a grid of 500 m^2 in my area of interest and pick the centroid of this square. How do I make sure that the grid created with Fishnet ...
0
votes
1answer
562 views

Convert WGS-84 position into lat/lng

I am using leafletjs. I have a list of "WGS-84" positions that look like: LATITUDE N45 52.1096 LONGITUDE W125 52.4665 LATITUDE N48 24.1051 LONGITUDE E174 37.3832 What is the significance of the ...
20
votes
3answers
15k views

What causes the GPS offset/shift in China?

I've spent close to two full days trying to understand the nature of the infamous GPS shift in China. After sifting through the noise, two recurring symptoms are that: GPS coordinates (WGS-84) plot ...
7
votes
3answers
10k views

Choosing UTM zone to use for large country?

I want to reproject OpenStreetMap roads data from the current projection (WGS 84) to UTM, since I read in another GIS SE Q&A(Getting $length in meters in QGIS?) that WGS 84 cannot be used to ...
1
vote
1answer
437 views

st_length column in Postgres db and ArcGIS under WGS84

I have a polyline feature class in ArcGIS running on top of postgres in WGS84 datum. I am wondering what is the unit of length used to drive st_length column under this datum and what is the method of ...
0
votes
1answer
804 views

How to use WGS84 in postgis?

I am getting NMEA output (WGS84) from my GPS and would like to put that into Postgis table. Format of the coordinate is 3267.56N 02575.92W. Is there way to insert that coord in db ?
0
votes
0answers
324 views

Erroneous location when converting from a GCS_WGS_1984 to UTM

I have a shapefile map of Belgium divided by cantons that I want to re-project in order to have units in meters and to be able to calculate distances. I know how to do it with ArcGIS Projection tool, ...
1
vote
2answers
692 views

Scalebar gives error in measurement in Qgis: Different measurements of distance on OSM tiles and GoogleEarth

I've created a map of Bordeaux using the QGIS map compositor by following this procedure: Used the OSM plugin to display an OSM map and zoomed to Bordeaux Used the print composer to create a map of ...
0
votes
1answer
42 views

problem in PostGIS Name of the system used for Points and how to get distance between to point?

I have started to work on a project in PostGIS. I have a table with a geometry points in which points saved like this : "010100000089F511C671C01E4162327E2A83545341" and I have translated this ...
2
votes
1answer
658 views

Convert 2D coordinates from NAD83 to WGS84 using Postgis

I have a set of NAD83 coordinates that I need to convert to WGS84 coordinates. I am using postgis on an RDS. Specs for the box I am using from postgis_full_version(): POSTGIS="2.1.3 r12547" GEOS="3.4....
1
vote
0answers
49 views

Projecting NAD83 on-the-fly to WGS84 [duplicate]

I have a point feature class in a geodatabase that uses WGS84 as its SRS. A colleage of mine created points in this feature class using an external database containing lat and long values. However, ...
16
votes
2answers
17k views

Converting between wgs84 and nad83

This is a newbie question that is about converting between wgs84 and nad83. I have aerial photos that I am trying to compute lat long coordinates for as closely as possible. There are several factors ...
0
votes
1answer
936 views

What is the formula for converting from WGS84 to EPSG:3071 (Wisconsin Transverse Mercator)

I have GIS software that can do this conversion but I need to know the actual formula / math involved. I'm writing code and need to perform a single conversion (WGS to EPSG:3071) so using a library, ...
2
votes
1answer
1k views

Find latitude of point on great circle given longitude

I am trying to find out wether my implementation has faults and/or if there is a better method. The problem: Given two points (Lat/Long) defined over the WGS84 ellipsoid, find the point lying on the ...
1
vote
1answer
159 views

Transforming a PNG from RD_new to WGS84

I got the request to transform a PNG in RD_new to WGS84. Is this possible? I was thinking of changing the accompanied world file its coordinates. I do not think it is possible to load in a png in a ...
1
vote
0answers
1k views

Determine lat/lon intersection on earth from point in space along 3d line

I have a known point in space with a lat,lon,alt. It has a camera with a line of sight and a angle of field of view. I can take the central point and calculate each corner vector of the field of view, ...
2
votes
1answer
202 views

Unknown Coordinates

I'm new at GIS. I'm using ArcGIS 10.2.2 and trying to geocode some addresses. I used a geocoding service which gave the coordinates in this format: POINT(102778.307715144 105888.168842117) I don't ...
1
vote
1answer
3k views

ITRF2008 to WGS84 Datum Transformation in ArcMap?

If I have data in IRTF2008 as shapefile is it possible to change this to WGS84 and how? The need for this comes when trying to display the data in a third party program that doesn't recognize the ....
1
vote
1answer
250 views

how to transfer a geotif with WGS84 to a mercator array for ploting it with matplotlib.basemap

I want to plot data from a sensor raster file (tif) to a map using basemap. I have a geotif with 'WGS 84' >>> gtif = gdal.Open("example.tif") >>> print gtif.GetProjectionRef() ...
0
votes
2answers
3k views

Formulae to convert WGS84 coordinates (B,L) to spherical coordinates (phi,lambda)?

How to convert WGS84 coordinates(B,L) to spherical coordinates(phi,lambda)? I Need Formulae? the thing I'm wondering seems quite simple but I've been searching through internet and library of my ...
2
votes
1answer
774 views

Point-in-polygon using WGS84 geographic coordinate system

When running a point-in-polygon operation, is it valid to run that with polygon features in straight up WGS84 and a point in lat/lng, or should both be projected into a non degree based coordinate ...
2
votes
1answer
504 views

J2000 to WGS84 in QGIS?

How to transform Earth-Centered Inertial J2000 CRS to WGS84 CRS in QGIS? I searched J2000 in spatialreference.org, however nothing found. I don't know the proj4 string of J2000. Any advice would be ...
2
votes
1answer
979 views

Conflicting WGS84 coordinates between Trimble and Garmin GPS receivers

I am a contractor at a government facility in Nevada. We have our own in-house survey department who, for a number of reasons, still uses NAD27 State Plane Coordinates (Nevada Central Zone 2702) in ...
2
votes
2answers
1k views

Is there an algorithm for transforming from CGCS2000 to WGS84?

Is there an algorithm that supports transforming from CGCS2000 coordinate to WGS84 coordinate? CGCS2000 is China Geodetic Coordinate System 2000. Any advice would be thankful!