The coordinate system known as World Geodetic System 1984 (EPSG:4636)

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32 views

Averaging Cartesian ECEF coordinates then converting to WGS84 without latitude drift

Preface: I'm unsure if GIS or math is the correct community for this question. I have a set of 9 WGS84 latitude/longitude (degree) pairs for which I need to find the weighted average of. To prevent ...
3
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1answer
95 views

How do I figure out the length of polyline features in a feature class with a WGS 1984 coordinate system?

I'm trying to figure out lengths of polyline features in a feature class with a WGS 1984 coordinate system. Here's code to list lengths: >>> import arcpy >>> inFc = ...
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25 views

Converting from flat earth to WGS84 with python

I'm looking to move from basic 2d Cartesian coordinate system into WGS84. I know my starting coordinates, however all intermediate points are x/y/z points. of an origin 0,0,0 . Mathlab has a ...
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1answer
33 views

Autocad DXF to Qgis and exporting to KML for viewing in Google Maps

/ Background: I have a DWG trace made in AutoCad using Gauss-Kruger coordinate system ( a CRS used in Slovenia ). I'm using AutoDesk Map 3D to transform the coordinate system to WGS84.PseudoMercator ...
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24 views

Inputting Longitude and Latitude in CSV from Geotagged, Photo Coordinates (WGS 84)

I am trying to take Geotagged picture coordinates and put them into a CSV file to display in QGIS as point values. Using Picasa, I can see that the picture coordinates are in the correct locations on ...
2
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1answer
62 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 ...
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26 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: a) in WGS1984 N33, with a grid of 10x10km, b) in ETRS 1989 LAEA, with small ...
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1answer
15 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 ...
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43 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 ...
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22 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 ...
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1answer
66 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 ...
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2answers
31 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, ...
2
votes
1answer
45 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 ...
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20 views

WGS84 to OSGB, using VB script

first post from an occasional programmer... 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 ...
4
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3answers
129 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: ...
2
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1answer
57 views

DotSpatial problems with reprojecting shape files

I have a shape file with this projection: ...
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19 views

Estimating world position of origin of coordinate system based on its members global position?

I have n points of interests (POIs). I have a local coordinate system. For all these n POIs I know there position in this system, that is there x, y, z translation (local position) from origin of ...
2
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2answers
75 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
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1answer
85 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 ...
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1answer
49 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 ...
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1answer
63 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
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2answers
87 views

MODIS-Sphere to WGS84 coordinate system in ArcGIS

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
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2answers
89 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. ...
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1answer
50 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 ...
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32 views

Interpolating a set of GPS points on ellipsoid earth model

I have a set of GPS (latitude, longitude) co-ordinates along with the time at which the coordinates were collected. Additionally, I have the speed and the heading of the vehicle at those coordinates. ...
3
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1answer
87 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: ...
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57 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 ...
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28 views

Escaping the MODIS Swath Projection with GDAL: MOD06_L2: MRT Swath Tool not working

Stackexchange, I am looking at ftp://ladsftp.nascom.nasa.gov/allData/6/MOD06_L2/2012/222/MOD06_L2.A2012222.0800.006.2015062054108.hdf Trying to get the SDS (in WGS84 Projection and as GeoTiff): ...
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63 views

Can I use 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 ...
3
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1answer
92 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 ...
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1answer
38 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 ...
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153 views

Converting coordinate notation from GDA94 to WGS84 gives ERROR 999999?

I am trying to convert my data from GDA_1994 to WGS_1984 using the 'Convert Coordinate Notation' tool from ArcToolbox. I used the import XY data tool to import my csv file with x,y fields (among a ...
0
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1answer
145 views

What's the 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? ...
0
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1answer
82 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 ...
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26 views

Convert WGS 84 cartesian 3D coordinates(x,y,z) to geographic coordinate (lat/long) [duplicate]

Do you know where can I find the formula and data needed to effectuate this conversion? Sorry I don't give enough information. I get the description file of a CORS ...
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2answers
42 views

Why QGIS Raster clipper does not work 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 ...
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1answer
141 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
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1answer
78 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 ...
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1answer
882 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 ...
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votes
3answers
376 views

Which UTM zone to use for a large country?

I want to reproject OpenStreetMap roads data from the current projection (WGS 84) to UTM, since I read in another GIS.SE discussion (How to get $length in meters in QGIS?) that WGS 84 cannot be used ...
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1answer
69 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 ...
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95 views

UTM ED 50 transformation to WGS84

I have a set of navigation shot points (pre 1975) with coordinates that are based on a UTM ED50 zone 33 projection and I need to transform these to WGS84. My procedure has been to load the excel fine ...
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1answer
89 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 ?
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84 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, ...
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34 views

Polygon Shifting in WGS 84

I'm troubleshooting some discrepancies between intersection results in State Plane and WGS 84. The intersect was ran when both the polygons and points were same PCS ...
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2answers
134 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
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1answer
29 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
138 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" ...
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147 views

Converting from WGS84 Ellipsoidal Height to NAVD88 Orthometric Height

Is anyone aware of a way to batch convert or project elevation z-values from a point from WGS Height Above Ellipsoid (standard GPS height) to ortometric NAVD height using the GEOID03 model in ...
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36 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, ...