A library for performing conversions between cartographic projections.
10
votes
2answers
251 views
How to reproject raster from 0 360 to -180 180 with cutting 180 meridian
I have a geotiff raster image that has a coordinate system with longtitudes from 0 to 360.
The horizontal center of the image is 180 longtitude. See image below:
I want to transform it to EPSG:4326 ...
5
votes
2answers
3k 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
4answers
1k 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 ...
5
votes
1answer
155 views
Does anyone know the proj4 Coordinte Reference System command line for Rectangular Polyconic Gores?
I am a GIS beginner using QGIS 1.8.0
I am trying to transform a world map from the standard WGS84 Coordinate Projection System to a set of rectangular polyconic gores, with a gore count of 12.
...
5
votes
1answer
56 views
Having trouble finding out what coordinate system a map is using, and how to convert it
I'm using Small Area shapefiles in Ireland from the Central Statistics Office (CSO) website. The link to these is here http://census.cso.ie/censusasp/saps/boundaries/ED_SA%20Disclaimer1.htm (Look for ...
5
votes
1answer
151 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 ...
4
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 ...
4
votes
1answer
105 views
pyproj, proj4 doesn't return same coordinates after inverse conversion
I'm trying to interpolate between coordinates, as a step in that process I convert latlong to UTM so I can work in metric.
I don't get the expected latlong when converting back, reproduced below:
...
4
votes
1answer
261 views
use proj4 to specify Robinson projection with R ggmap and ggplot2 packages?
I want to project this map in robinson projection:
library(ggmap)
world <- map_data("world")
ggplot() + geom_path(data = world,
aes(long, lat, group = group))
...
4
votes
1answer
495 views
projection/pyproj puzzle, and understanding SRS format
I have a shapefile that has a .prj file, with the following wkt contents:
...
4
votes
1answer
67 views
Openlayers/Proj4js not transforming coordinates the first time
Something seems to be going wrong with my transformations. Before I added proj4js, transforming a coordinate went fine:
new OpenLayers.LonLat(-1.0, 52.0).transform(new ...
4
votes
1answer
82 views
Problem with custom projection definition in Qgis
I want to define a custom crs valid for Mexico. The context is that older cartography in Mexico is based on the NAD27 datum. I wanted to test the following proj4 string
+proj=longlat +ellps=clrk66 ...
4
votes
1answer
297 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 ...
4
votes
1answer
227 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 ...
3
votes
1answer
58 views
Location for floorplan
Is there an application / service where I can put my floorplan of a building en 'position' it on the right place on the earth? (The buildings location).
I found TileMill an application where I can ...
3
votes
1answer
221 views
how to add a custom SRID to Spatialite
I'd like to create a spatialite database and load it with shapefiles using the Mississippi Transverse Mercator (MSTM) projection, but it doesn't have an EPSG definition in the spatialite library of ...
3
votes
3answers
699 views
How to define ITRF 92 and ITRF 2008 using Proj4 parameters in QGIS?
I know how to define a CRS, but this particular one is giving me a headache. I was unable to find the EPSG code at spatial reference.
The main reason for asking this is that raster and vector data ...
3
votes
1answer
611 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 ...
3
votes
2answers
1k 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 ...
3
votes
1answer
176 views
Get the geotransform in Mercator given a pixel size away from the origin
I have a radar image with the following information:
The projection is Mercator (Mercator_1SP in GDAL)
The projection origin is 0º lat 0º lon
At a given geographic coordinates (e.g. lon=10º ...
3
votes
1answer
121 views
proj4 cookbook?
Is there a proj4 "cookbook"? I discovered proj4 from @MerseyViking
excellent answer to: Create Mercator map with arbitrary center/orientation? but
most of the documentation appears to be fairly high ...
3
votes
1answer
190 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 ...
3
votes
2answers
109 views
SRS: geographic or cartesian?
Let's have a list of SRS with proj4 definitions (e.g. spatial_ref_sys table). Is there a way to determine whether given SRS is geographic (lon,lat) or cartesian (x,y)?
3
votes
0answers
50 views
How can I specify a spatial reference system which has a north pole different than the standard north pole?
I have a geographic spatial reference system (i.e., latitude and longitude) which has a north pole that is not the usual north pole: it's the magnetic north pole at approximately 70.30 degrees north, ...
3
votes
0answers
240 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, ...
2
votes
4answers
1k 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
441 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).
...
2
votes
3answers
2k 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 ...
2
votes
1answer
140 views
How do I solve a “No PROJ.4 translation” error with gdal?
I've installed gdal using the brew utility on OS X so the proj and geos dependencies were also installed. I'm now trying to warp a GeoTIFF so that I can import it into Google Earth. I am getting a ...
2
votes
3answers
153 views
How would you use change the projection within KML file?
I have created some KML files by converting the projection with both ARC and MapWindow.
I'm looking for ways to automate exporting the data from our application with coordinates in State Plane ...
2
votes
1answer
321 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
1answer
460 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 ...
2
votes
1answer
2k 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: ...
2
votes
1answer
568 views
How to setup leaflet map to display a WMS layer in ESRI:102012 projection?
I have a WMS server that serves layers in ESRI:102012 projection.
http://spatialreference.org/ref/esri/102012/
It accepts GetMap requests with srs=EPSG:102012 parameter.
My goal is to display a map ...
2
votes
1answer
177 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
0answers
56 views
Proj4 inconsistent longitude after projection
All coordinates expressed in this question are (longitude, latitude), the default for proj4. London is at (-0.1460838, 51.5170986), and San Francisco is at (-122.419302, 37.775549). According to the ...
2
votes
0answers
250 views
Projecting point in Leaflet from EPSG 900913 (same as 3857) to EPSG 2232 with proj4js returning unexpected results
I have a leaflet map from which I want to be able to query an api that accepts x y values in EPSG 2232 as inputs. Leaflet doesn't handle point transformations like Open Layers does so I am trying to ...
2
votes
0answers
62 views
Proj4s.js Library Transformation Accuracy Documentation
I am using proj4s.js for transforming between coordinate systems for a GIS web application. Is there any documentation out there on transformations accuracy provided by the library?
1
vote
2answers
198 views
What is the SRS code for Lambert Conformal Conic projection and GCS Everest Definition 1962?
I have a shapefile with Geographic Coordinate System is "GCS_Everest Definition 1962" and the Projected Coordinate System is "Lambert_Conformal_Conic". I want to add this shapefile in Geoserver. But I ...
1
vote
1answer
113 views
Looking for CRS for NAD 83 UTM Zone 30N
I'm curious as to why the UTM zones are incomplete for NAD 83 in QGIS? I have a WGS84 shapefile that I would like to project to NAD83 UTM Zone 30N but can't find it in the QGIS CRS list.
I see how ...
1
vote
1answer
116 views
PROJ.4 custom projection that is Transverse Mercator with Affine post-process
I am trying to define some of my local TMAF grids in PROJ.4 so I can reproject points between the local grid and MGA95 and/or WGS84.
For these grids I have the MapInfo CoordSys clause which defines a ...
1
vote
2answers
257 views
Why is Spatialite delivering “Invalid SRID” error message
Qspatialite in QGIS 1.8 (and also Spatialite-gui) delivers an "Invalid SRID" error message when I try to load shapefiles with a SRID value of 3814 (Mississippi Transverse Mercatur). The SRID is ...
1
vote
2answers
623 views
How to convert Lat/Long to UTM using Proj(4j) similar to JScience UTM.latLongToUTM?
I'd like to use Proj(4j) to convert between UTM and Lat/Long coordinates.
I used to use JScience for UTM <-> LatLong conversions like this:
UTM.latLongToUtm(latlong, ReferenceEllipsoid.WGS84);
...
1
vote
1answer
74 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
1answer
243 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 ...
1
vote
1answer
38 views
How to fix PJ_healpix.c in PROJ.4?
Michael Speth and i are in the process of fixing the PROJ.4 implementation of the HEALPix map projection (see http://trac.osgeo.org/proj/browser/trunk/proj/src/PJ_healpix.c for the current buggy ...
1
vote
1answer
99 views
Problem reprojecting KML in EPSG:2039 Map - OpenLayers 2.12 + proj4js
I have KML files (EPSG:4326) and a background map I made using EPSG:2039 projection (mandatory).
When I try reprojecting the KMLs to show in EPSG:2039 I don't succeed and still they don't appear on ...
1
vote
1answer
632 views
Mapping x, y pixel coordinates to latitude and longitudes on the WGS84 datum
Apologies in advance for the long question, I am fairly confused at this point and I figure if I show my thought process any flaws early on in the piece can be more easily pointed out.
I have a grid ...
1
vote
2answers
206 views
Geodjango - using projected coordinates with olwidget
I have a database in GeoDjango containing data based on the Australian MGA54 coordinate system (SRID 28354). I have the srid set in the model definintions and when using the standard GeoModelAdmin ...
1
vote
1answer
100 views
Tool For Generating Formula for Projection
I am using Proj4Js for northing,easting to lat,long transformation.
My Datum is "AGD84" and projection is "Transverse Mercator".
While doing so I found that if I don't specify "+proj" parameter in ...
