The coordinate system known as World Geodetic System 1984
1
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2answers
40 views
Searching for c# code to convert from UTM to WGS1984 (and back)
I'm looking for code in c# that converts coordinates from UTM to WGS1984 (and preferably backwards as well). I need to convert coordinates from only one zone (36N).
I've found this and this, but they ...
2
votes
1answer
60 views
What is the formula to convert WGS84 coordinates to EPSG 2163?
I'm looking for the formula which converts wgs84 coordinates to epsg 2163. I know that QGIS can do the calculations but I need the exact formula.
Cheers!
0
votes
1answer
32 views
Wrong object size after projecting spatial data from one coordinate system to another
I am having problems reprojecting items in ArcMap 10.1 from British National Grid To WGS84. (WKID: 27700 Authority: EPSG to WKID: 102100 Authority: ESRI)
All Polygon Layers I project [I use Project ...
3
votes
0answers
22 views
problem creating and editing features at extent edges
I'm in the process of creating a polyline feature layer of tectonic plates. I'm working with WGS-84 reference system, which means the extent is +-180 in lon, and +-90 in lat.
In order to create the ...
1
vote
1answer
53 views
PROJ4 C++ API: Amersfoort RD New to WGS84
I try to convert between dutch RD New (EPSG:28992) and WGS84 (EPSG:4326) via PROJ4 C++ API.
On the console this works with:
cs2cs +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 ...
1
vote
1answer
69 views
How to convert EPSG:2163 coordinates to wgs84 in javascript
I'm currently testing a web app that calculates EPSG:2163 coordinates based on user interaction with a map created through d3.js. I wish to convert these coordinates to WGS84 in order to use various ...
1
vote
2answers
62 views
Is it possible to change a Geotiffs CRS?
Hi I have created a Geotiff from the Bing Aerial photography.
As it is automatically in WGS 84 it inserts perfectly into QGIS, however this image is of no use to me outside of QGIS.
I need to ...
1
vote
1answer
50 views
Extracting Data from the NLCD dataset.
I am working with U.S. National Landcover Dataset (NLCD) to classify habitat type at more than 150 sites across the northeast U.S. The dataset is very large (15GB) so I cannot upload it here, but it ...
2
votes
1answer
80 views
Find projection of a point to a line
I have a segment defined by 2 LatLon points(A and B) and a third LatLon point (C).
I need an alghorithm, formulae, or some code to find the projection point of C on the segment AB (call this point D) ...
2
votes
1answer
175 views
WGS84 - how to convert
I have multiple locations saved in WGS84 - it looks like e.g. latitude: 12345678 longitude: 87654321. I tried to search it on the map this way: 12.345678 87.654321, but it doesn't match the place it ...
1
vote
0answers
113 views
Get the distance between 2 WGS84 GEOSGeometries
I currently want to check if 2 given GEOSGeometry objects of type Point are within 100m of each other. (length flexible)
Looking at previous asked questions on this topic, most of the answers were ...
3
votes
0answers
106 views
Bearing/Course/Heading in WGS84 ellipsoid model
There is a common formula for computing the initial bearing for a course from lat1, lon1 to lat2, lon2. (And yes, I'm aware that the course will change when traveling).
atan2( sin(lon2-lon1) * ...
1
vote
1answer
70 views
Projection WGS 84 is slightly displaced referring to a hillshade in QGIS
I have a hillshade and a vector layer. The vector layer is slightly displaced referring the hillshade. About lat=100m and long=175m
The CRS of the project is EPSG:3397 - PD/83 / Gauss-Kruger zone 4.
...
2
votes
1answer
191 views
How to make world file in WGS84 out of OpenLayer's Google Earth layers?
I would like to make world file out of OpenLayer's Google Earth.
The problem is, that Google Earth layers in Qgis are shown EPSG:3857, but I need just standard WGS84 (ESPG:4326). When I try to set ...
3
votes
1answer
117 views
Why is my Polygon (WGS84) in SpatiaLite 4 not displayed by QGIS? [closed]
I made a polygon in a SpatiaLite 4 database as follows:
INSERT INTO test_pg (id, name, geom) VALUES (3, 'test', ST_PolyFromText('POLYGON((8.556824 47.185269, 8.611009 47.185269, 8.611009 47.218568, ...
2
votes
2answers
141 views
What's the best projection for rasterization of random latitude and longitude data in the northern Atlantic?
I have a dataset in the WGS84 geographic coordinate system that I would like to interpolate along a grid using Python.
It appears gdal_grid is not available through the Python bindings, so I plan to ...
0
votes
1answer
222 views
Convert Lat/Lon to Pixel-XY on cropped map
I've got a little problem.
I have a GPX-Track containing LatLon coordinates based on WGS84. The track should be drawn on a cropped map, and for this, I need the pixel coordinates. The map tiles are ...
3
votes
1answer
453 views
What is the relationship between ITRF and WGS84?
Why are there people saying that "I am using WGS84(ITRF96)"?
There are newer version of ITRF. Will WGS84 follow it?
If so, what will be the influence to us?
6
votes
3answers
318 views
How do I get the area of a WGS84 polygon in square meters?
The following gives me the area of the polygon in square degrees:
SELECT ST_Area(ST_GeomFromText('POLYGON((871325.790874952 6105405.3261047,871418.748307692 6105359.72944624,871346.22022442 ...
2
votes
0answers
56 views
is ellipse inside ellipse in WGS84 ellipsoid
My question is quite clear:
Assume that there is an ellipse, namely EL1. Parameters of the ellipsoid are (focus11 [latitude, longitude], focus12[latitude, longitude], radius1).
And a second ellipse, ...
2
votes
1answer
421 views
QGIS: On the fly projection from WGS84, 19 N, to Web Mercator. Do I need to define a new CRS with transformation parameters?
Workin in QGIS, I have a shapefile called "protected areas" of Dominican Republic, that was digitized from topomaps 50k. Shapefile is projected to WGS84, 19N zone. My problem is that when I load ...
2
votes
0answers
83 views
projection discrepancy with gdal (1.9) and proj4
I boiled the problem down to that python example:
import sys
try:
from osgeo import gdal
from osgeo import osr
except:
import gdal
import osr
if __name__ == '__main__':
version_num = ...
0
votes
1answer
202 views
Transform Shapefile from WGS84 to NAD83 using QGIS? [duplicate]
Possible Duplicate:
How to reproject a vector layer in QGIS?
I have some shapefiles whose CRS is WGS 1984 and I have some shapefiles whose CRS is NAD 1983 State Plane Illinois East. I want ...
2
votes
1answer
152 views
How to convert NAV4 coordinate system to WGS84?
I would like to know whether it is possible to convert the coordinates given in a NAV4 coordinates system into WGS84. I could not find out what NAV4 is and if it is actually a standardized CRS.
Here ...
3
votes
1answer
261 views
How to convert a geotiff from WGS84 to 3857 with gdalwarp?
I'm trying to convert images with WGS84 projection to 3857 but warp is not giving me a output I would expect.
This is my command:
gdalwarp -s_srs "+proj=merc +datum=WGS84" -t_srs "EPSG:3857" ...
1
vote
0answers
94 views
Convert MapCoordinate from WGS 84 and vice versa - ESRI MOBILE 10.0
I am seeing a strange issue in 10.0 mobile version. If a convert a coordinate (x.x,y.y) to WGS84 using mobilecache1.spatialreferece.towgs84 and if I convert the resulting GPS coordinate back to map ...
1
vote
1answer
886 views
How to Project shapefile from NAD 1983 UTM Zone 12 to WGS 1984 UTM Zone 13N?
I have a question and I have a shapefile that is in NAD UTM Zone 12 and Datum is North American Datum of 1983.
What I would liket to reprojection it to NAD 1983 UTM Zone 13N and change the Datum to ...
1
vote
2answers
159 views
Proper gdaltrasform syntax to transform a list of coordinates?
this is probably a very simple question, but I'm very new to GIS so I just need one last nudge. I've got a sense of the Linux utility gdaltransform and I am feeding it coordinate pairs in ...
2
votes
1answer
204 views
How do I convert EPSG:26986 coordinate pairs to EPSG:4326 from the MassGIS web service, the Linux command-line, or PHP?
I'm a GIS newbie, normally a PHP web applications developer.
I am trying to map all boundaries of the MA state representative districts. So I just need to convert polygon coordinates from the ...
0
votes
2answers
815 views
6
votes
1answer
601 views
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):
...
3
votes
2answers
2k views
How to calculate new point coordinates from distance and angle?
I want to calculate the coordinates of a new point.
What I have: The source point coordinates, the distance (meters) and the angle
For example: I want to create a point within 100 meters and 45 ...
0
votes
0answers
106 views
QGIS 1.8 problem with rendering polygons in WGS84 on Ubuntu 12.04
I'm using QGIS 1.8 on Ubuntu 12.04. If I add a polygon layer in SHP format and WGS84 projection and start to zoom in, from a scale of 1:200.000 aprox. polygons on the edges are not drawn anymore and ...
1
vote
3answers
1k views
How to convert from EPSG:4326 to WGS84/UTM 32U?
I am unable to convert from the project's coordinate system to a different one using QGis 1.8.0.
I have a .shp file with a certain coordinate system information (WGS84 EPSG:4326 according to qgis). I ...
1
vote
1answer
547 views
How to convert Lat & Long from Onemap.sg to Google Maps
I have a set of address for Singapore, I would like to take the Lat & Long from onemap.sg (SYV21: X, Y / Easting, Northing) and then store it in my databse , convert into (WGS84: Longitude, ...
0
votes
0answers
25 views
Adding distance in meters to a wgs84 coordinate [duplicate]
Possible Duplicate:
Algorithm for offsetting a latitude/longitude by some amount of meters
I have a wgs84 coordinates(two double figures). Then I need to add some distance in meters to the ...
2
votes
2answers
3k views
convert wgs84 coordinate to Google Map coordinate system(EPSG 3785) with geotools and java
Could you please point me out where can I make such a transformation:
convert wgs84(EPSG 4326) coordinate to Google Map coordinate system(EPSG 3785), and vise versa.
Thank you.
4
votes
1answer
774 views
Distances in {Plate Carrée projection - EPSG:4326 - WGS84}
So,
"4326 is just the EPSG identifier of WGS84" [3], indeed http://spatialreference.org/ref/epsg/4326/html/ says it is a GEOGraphic Coordinate System:
GEOGCS["WGS 84",
DATUM["WGS_1984",
...
1
vote
0answers
237 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 & ...
2
votes
0answers
418 views
OSGB36 to WGS84 reprojection 'error'
First off, I am a recent convert to QGIS and am greatly impressed with its ease of use and speed compared with the ESRI products with which I am more familiar - my congratulations and thanks to its ...
2
votes
0answers
147 views
Correct DTED vertical datums
I have a standard DTED data. DTED data vertical datums are specified using EGM96 geoid.
I would like to correct these DTED data vertical datum in a way their are referred to the WGS84 vertical datum ...
4
votes
4answers
847 views
OSM To Postgis & WGS84 problems
I’m trying to import OpenStreetMap (OSM) data into postGIS it doesn’t appear to be working in that features do not appear to be in the correct place..
Using the QGIS OSM add in and a coastal shape ...
2
votes
2answers
862 views
How are EGM96 and WGS84 related to each other?
As far as I understand the EGM96 defines the Geoid, where as the WGS84 Standard defines the Ellipsoid.
Is the ellipsoid defined in the WGS84 standard defined in a way to maximize the congruency with ...
19
votes
2answers
341 views
Precision when working with spatial data in GIS
Is there a basic or introductory study that examines and compares the precision of spatial data when working
with varying precison of the data input, like having 1, 2, ... decimal places?
with the ...
5
votes
2answers
1k views
How is EPSG:4326 data 'projected' in a 2D map?
I like to think I'm relatively well-versed in datums, projections, and coordinate reference systems, so if this is a stupid question I will suffer eternal shame.
OpenStreetMap data is stored in WGS84 ...
3
votes
1answer
369 views
Point of Intersection for a Ray and Earth's Surface
Say I have a ray vector originating from somewhere out in space. An example might be a ray of light from the sun. How can I calculate the point of intersection (if it exists) between the ray and the ...
4
votes
1answer
1k views
Characteristics of different methods to convert ECEF to LLA
I'm trying to convert ECEF (Earth Centered, Earth Fixed) coordinates, which are defined in X,Y,Z, centered at (0,0,0) to LLA (Latitude, Longitude, Altitude). There are a couple of methods I found on ...
0
votes
2answers
2k views
Converting from British National Grid (27700) to WGS84 (4326) to Web Mercator (102100)
I'm developing a web application that uses ESRI ArcGIS to display a map using JavaScript.
We are holding all our data in MS SQL Server 2008 as Easting/Northing against the British National Grid. ...
8
votes
2answers
2k views
How do you compute the earth's radius at a given geodetic latitude?
(I see there is an equation on wikipedia that does exactly what I am asking but there is no references. I have no way of confirming the validity of this equation!)
I already understand the difference ...
7
votes
3answers
4k views
How do I calculate the bounding box for given a distance and latitude/longitude
Hi need to be able to calculate a bounding box or circle for a Given WGS84 latitude and WGS84 longitude, and distance but have no Idea where to start! The distance from the start lat Lon would be 10KM ...
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