A library for performing conversions between cartographic projections.

learn more… | top users | synonyms

2
votes
1answer
247 views

Proj4 Task not working - Northing Easting to Lat Lng

I usually post in StackOverFlow - if this is the incorrect area to post - I apologise. I have trying to convert a lot of northings / eastings to lat lng I have code below working: In ruby using ...
2
votes
1answer
788 views

Projection ETRS89 (Ellipsoid: GRS80) 6-Degree Zone 33 to UTM33N - WGS84

Hi I'm having trouble to reproject a shape file in Qgis. The projection is supposed to be "ETRS89 (Ellipsoid: GRS80) 6-Degree Zone 33" and I would like to project it to UTM33N - WGS84 (EPSG 32633). ...
3
votes
1answer
331 views

What's wrong with my Proj4 transformation?

I am having trouble converting a projected coordinate EPSG:28355 to WGS84 EPSG:4326 using Proj4js. I know by default Proj4 will not convert to EPSG:28355 so I went to spatialreference.org and got the ...
1
vote
0answers
319 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 & ...
1
vote
1answer
98 views

Which SRS is computational more effective to store continental scale data? (given some conditions)

For a Precision Agriculture application I need to make calculations in UTM projection. The data will be stored in Postgis and is made of soil samples results (point data) and field boundaries of many ...
1
vote
0answers
299 views

How do I use Proj4js or other technique to make custom map projections with google.maps.Projection?

I'm using Google's Projection class to try to convert my map projection from the default spherical mercator to something like Lambert Conformal Conic. I was previously adapting the code from this ...
4
votes
1answer
456 views

How to define a CRS using a projection rotated about a given point

I have a data set that uses a common projection, but has its own false easting and northing, and is rotated 315 degrees. I need to be able to work in this CRS and easily translate from one CRS to ...
2
votes
2answers
1k views

How to perform transformations using ProjNet?

While writing some unit tests I thought it would be convenient/possible to use ProjNet to convert from EPSG:4326 into several other coordinate systems (3875,3395). I figured it would be as easy as ...
8
votes
0answers
526 views

How to define Winkel Tripel in proj 4.8.0?

I have QGIS with proj 4.8.0 installed. I'd like to add Winkel Tripel projection which seems to be defined as +proj=wintri But that definition string does not work. Is this a bug in my proj version, ...
1
vote
1answer
349 views

Can we use proj to offset coordinates?

Can someone please help me construct a proj string to offset coordinates? The detail we have - one coordinate point in a local construction grid, and the corresponding WGS1984 LatLong which we ...
4
votes
1answer
449 views

How to make PROJ4 on windows including NZ datum shift grids

Can anyone point me to an example of how to 'make' proj4 including the New Zealand datum shift grids? I understand I need to include the shift grids in the build, just not sure how to make it on ...
2
votes
1answer
525 views

compiling a c++ program using proj.4

I am real new to C++ and am having trouble compiling a C++ program that uses the proj.4 library. I downloaded and compiled and installed the proj.4 library on my machine. So, the '/usr/local/lib' ...
2
votes
4answers
2k views

OpenLayers transform EPSG 27700 coordinate to Google 900913

Community, I'm currelty capturing my mouse click event and trying to transform the coordinates into Long Lat. I need to get at the Long Lat as strings so I can build a url and throw it at Google ...
2
votes
1answer
653 views

What is wrong with this Proj4 transformation?

I'm implementing support for WMS maps in my company's software. Servers return a list of projections their maps are available in, but our software only displays data in WGS84 (lat/lon or UTM), and ...
6
votes
1answer
707 views

projection/pyproj puzzle, and understanding SRS format

I have a shapefile that has a .prj file, with the following wkt contents: ...
1
vote
0answers
147 views

Proj4js can't handle 90/180degree transformations from 4326

So if you try to do a transform like this Proj4js.transform( new Proj4js.Proj( 'EPSG:4326' ), new Proj4js.Proj( 'EPSG:3857' ), new Proj4js.Point( -180, -90 ) ...
6
votes
1answer
187 views

What is the definition for a geographic coordinate system with east/west bounds of 0 to 360

I need the coordinate system reference or a projection definition that uses geographic (i.e. lat/lon) coordinates but instead of east/west bounds being defined as 180 to -180, I need them to be ...
5
votes
4answers
2k views

PostGis ST_Transform: failed to load NAD27-83 correction file (-38)

So I'm getting some user drawn polygons in WKT with OpenLayers. (Web Mercator CRS) and I now need to now convert it to SRID4326 so can do some spatial queries. However, when it fails to do a ...
3
votes
3answers
4k views

How do I include proj4js in openlayers?

in my Openlayers app, since the base map projection is not epsg900913 or 4326, I need to include proj4js in order to use geolocation feature. but i got such a error notice: GET ...
3
votes
1answer
921 views

Proj4js objects not readyToUse

I am using Proj4js to transform between WGS84 and a local Swedish grid RT90 (EPSG:2400). It works in FF, but in IE the Proj objects often is not readyToUse when I need them to. I use this code to ...
1
vote
1answer
435 views

How to resize layer using .prj (WKT) projection? (Geographic Coordinate System)

Briefly: How to parametrize .prj WKT file so that I can perform 7 point tranformation (wiki). I know how false_easting and false_northing params work, but how can I adjust scale? I do not mean ...
5
votes
2answers
6k views

Converting X,Y coordinates to lat/long using pyproj and Proj.4 returns the wrong coordinates

I'm writing a python script that reads multiple XML files containing x and y coordinates and combines them all into a single csv file. Latitude and Longitude are required fields in the csv, but I am ...
5
votes
2answers
2k views

what is the best way to programmatically convert between WKT and Proj4 string?

some shapefiles have a .prj file associated with it. and the .prj file contains the projection info of the shapefile in the format of WKT. Sometimes I need to convert WKT to proj4 string, and ...
3
votes
2answers
2k views

How to integrate Proj4 into an iOS / iPhone project?

This may be overkill, but I need to reproject a point coming from the CLLocationManager, which is in EPSG:4326, to Dutch RD (Double Stereographic, EPSG:28992) in my iOS application and I am using ...
4
votes
1answer
3k views

Converting Lambert Conformal Conic to WGS84 using Proj.4

I am attempting to transform data from Lambert Conformal Conic lat/long and I am having some issues with the results. The shapefile I am attemtping to transform can be found here: ...