A library for performing conversions between cartographic projections.

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1answer
32 views

PROJ.4 - General Parameters: +no_defs

within a QGIS-course I would like to tell a bit about the proj.4 parameters. However, I´m not sure about the "+no_defs" parameter. The proj.4 website (https://trac.osgeo.org/proj/wiki/GenParms) ...
1
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1answer
110 views

Slight translation with coordinate-transformation from Gauss-Kruger to WGS 84. Possible Reasons?

I have a number of points in Gauss-Kruger, Zone 3 that I want to convert to display them within Google-Earth. Assuming WGS84 for Google-Earth the transformed coordinated differ from the original ones ...
2
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1answer
54 views

Definitive list of Proj4 supported coordinate systems

I need to determine the minimum set of coordinate systems supported by all tiers of my project's stack. I have a list of EPSG codes supported by Oracle and GeoServer but I'm having trouble finding a ...
1
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1answer
33 views

Unable to add features in QGIS 2.4.0

QGIS beginner problem. I can no longer create features with "Add Feature" in QGIS. The info triangle message is "Transform error caught: forward transform of (0.000000, 0.000000) PROJ.4: ...
3
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3answers
98 views

Proj4 String for NAD83(2011) / Louisiana South (ftUS)

I am trying to convert NAD83(2011) / Louisiana South (ftUS) coordinates on survey maps to lat/lon using Proj4 in Python. Could someone please point me in the right direction? I have verified the ...
2
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1answer
29 views

Proj4js: Is this correct implementation of Azimuthal Equidistant relative to an arbitrary center?

If I wanted to interpolate points along a Great Circle Arc, it makes sense that either endpoint of the Great Circle is a satisfactory starting place. Next, I suppose I'll need a projection to preserve ...
1
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1answer
27 views

WFS with EPSG:3301 projection using Leaflet

I am adding WFS points to Leaflet map, but don't see them on the map, however in console I see that all points I wanted is here with all properties and geometries. But the problem here is in ...
1
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1answer
81 views

Proj4js Problem in converting coordinates from google mercator

I am a really beginner into web-cartography, so sorry if this subject is rudimentary or basic but I truly search for a long time and I am still stick in it. So the problem is: I don't understand why ...
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0answers
9 views

Calculating z coordinate for longitude, latitude Google Map [duplicate]

I have a point (lon, lat) values. Is there any service to calculate Z coordinate of this point. Google service, OpenLayers service or others.
1
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1answer
63 views

Difference between ETRS89 / ETRS-TM32 and ETRS89 / UTM zone 32N

In QGIS I can choose among other things between "ETRS89 / ETRS-TM32" and "ETRS89 / UTM zone 32N". In my test project both projections displayed the layers at the very same place. So, where is the ...
2
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2answers
39 views

Custom projection problem with proj.4

I have some vector files that come without projection. So I have to define my own projection in QGIS. The information that comes with the data reads as following: Projection: Lambert Azimuthal Units: ...
1
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1answer
29 views

Why does the commands listgeo and gdalinfo don't show the same Proj4 Strings?

As the title says, why doesn't the unix tools listgeo and gdalinfo show the same proj4 strings? Check this file: ...
2
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1answer
82 views

Reprojecting MODIS Ice Sea Temperature products with gdalwarp

I have problems projecting MODIS Ice Sea Temperature (IST) products to EPSG:3031 (Antartic Polar Stereographic) using gdalwarp. The product I'm working with is MOD29E1D, documented here, p33: The ...
2
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1answer
70 views

Most efficient way to use UTM in leaflet

Our server is using UTM internally. We then send a large number of UTM Coordinates to display them in a custom made leaflet layer. First we transform (unproject) them into "normal" geographical ...
2
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1answer
140 views

Pyproj: converting WGS84 to Robinson

I have a WGS84 coordinate pair (37.7749295, -122.4194155). I have an image that is a Robinson Map Projection of the world. I'm trying to write a python script to locate my WGS84 coordinate on my ...
4
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2answers
114 views

Plot a Raster of Weather data in Leaflet JavaScript Map without generating server-side tiles?

I want to show different weather data I have as binary arrays on a server using leaflet. But I do not want to generate tiles on the server. For each point in an a array I have the coordinates in ...
0
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2answers
118 views

Dealing with custom projections (from prj file) in PostGIS (also GeoServer and OpenLayers)

Basically I want to perform spatial queries like distance calculations in PostGIS using data from shapefiles with different projections, some of which have no SRID code that I can find and also which ...
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0answers
102 views

How do I use Proj4Leaflet projections correctly?

I'm loading data layers from a WMS server into a Leaflet map, and I need to give the user a choice of projections. For the WMS server requests, I just need to change the CRS parameter to a different ...
1
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1answer
63 views

Can't get SRS from PostGIS using Proj4 text

I'm having a problem transforming a point from the Australian MGA UTM datum (eg MGA Zone 51 http://spatialreference.org/ref/epsg/28351/) to WGS84 using GeoDjango. I've narrowed that down to a problem ...
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0answers
77 views

Can't project ArcGIS Tiled Service for Esri-Leaflet

I'm following this example from the esri-leaflet docs. I have an ArcGIS Tiled MapService in ESRI:102696. So I'm trying to use Proj4Leaflet to project the service and use it in my application. I ...
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1answer
75 views

Uncaught TypeError during proj4 transformation

I get: Uncaught TypeError: Cannot read property 'x' of undefined at proj4js-combined.js:2720 While executing this code (transforming polygon from one system to another): Proj4js.defs['EPSG:3765'] = ...
0
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3answers
183 views

Transforming polygon using Proj4js

I am reading the Proj4js User Guide but cannot quite grasp it. I import the library <script src="lib/proj4js-combined.js"></script> Then, function init() { (...) // reading from ...
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0answers
106 views

Creating custom projections with Proj4

I'm reading into how to customise projections with Proj4 - specifically to achieve tilted projections such as the example below (from vis4.net) The Proj4 literature is pretty heavy going and having ...
1
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1answer
267 views

Converting Lambert Conformal (x, y) of spheroid to (lon, lat) of NAD83 with proj/cs2cs?

Revised Trial: Correct? According to Andre Joost advice, I tried with "+towgs84=0,0,0", and the both two ways seem to get the same answer that mkennedy posted below. So, just to make sure, anybody ...
0
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1answer
135 views

Reprojecting vector layer in OpenLayers

I have a simple OpenLayers map, where I would like to display the OSM map (the base map, in EPSG:900913) with some points on top of it (a vector layer, in EPSG:3763). I use proj4js. I do convert a ...
0
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1answer
285 views

converting projections using dotspatial or proj4

how can i convert projections using either dotspatial or proj4? i am making a program using sharpmap and dotspatial in VB.net have to convert a EPSG 4030 into a Lambert conformal conic projection and ...
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0answers
215 views

Leaflet + proj4js + EPSG:2180

I'm trying to add a WMS layer in EPSG:2180. I get the definition for EPSG:2180 from here and I am using this guide on GitHub to make a new CRS definition, but I think it is corrupted. It is not ...
0
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1answer
100 views

Scaling x,y coordinates in proj4

This question was asked before, but without answer. Let's say we have mercator map with given resolution (for simplicity in centimeters). Now let's get coordinates of (lat,lon) = (50, 15): $ proj ...
2
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3answers
181 views

How to use PROJ4 to reproject a file

Unfortunately, GDAL does not support a particular projection I am trying to achieve (the ob_tran rotated pole projection), so I am trying to use PROJ4 to convert a geotiff file to the projection I ...
0
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1answer
60 views

Is it possible to get all projections form OGR?

I'm working on a project where the user can give my program so GIS data which may or may not have which projection it is using. So is it possible to get a list of all the projections from OGR or ...
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0answers
90 views

How can I create Albers projection of Russia map?

I need a conic tranformation of map, so this code var map = L.map('map', { crs: new L.CRS.proj4js('EPSG:4326', '+proj=aea +lat_1=52 +lat_2=64 +lat_0=0 +lon_0=105 +x_0=18500000 +y_0=0 +ellps=krass ...
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0answers
119 views

Problem with custom projection in OpenLayers

I'm using OpenLayers 2 with Proj4JS 1.10. When trying to change the map's projection using Proj4js.defs['STEREOGRAPHIC:180,90'] = "+proj=stere +lat_0=90 +lon_0=180 +a=3396190.0 +b=3396190.0 +over=F ...
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0answers
53 views

How can I obtain the unit of a projection SRID?

Given a projection SRID, is there a way I can obtain the coordinates unit string (meter, degree, ...) ? In PostGIS for example, it looks like it is present in the srtext column of spatial_ref_sys. ...
2
votes
1answer
115 views

Shapefiles from Nationalgrid without a .prj file - what projection are they in?

Im working with these shapefiles: http://www2.nationalgrid.com/uk/services/land-and-development/planning-authority/shape-files/ They show pipelines & electricity grid of the UK. They do not ...
0
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0answers
19 views

How can I tell the accuracy of coordinates conversion by cs2cs? [duplicate]

For example, when I try this: cs2cs +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +to +proj=tmerc +lat_ 0=22.31213333333334 +lon_0=114.1785555555556 +k=1 +x_0=836694.05 +y_0=819069.8 + ellps=intl ...
1
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1answer
163 views

proj4js not convert y

Proj4js.defs["EPSG:2322"] = "+proj=tmerc +lat_0=0 +lon_0=36 +k=1 +x_0=500000 +y_0=0 +ellps=intl +units=m +no_defs "; Proj4js.defs["EPSG:4326"] = "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"; ...
0
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1answer
255 views

Convert from Gauss-Kruger to Bing coordinates / projection

I am trying to convert a shapefile with ogr2ogr from Gauss-Kruger (zone 4) to Bings coordinate system / projection using the advice given in ...
0
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1answer
684 views

Convert GeoJSON form EPSG 3857 to 4326 with JavaScript [duplicate]

Given a GeoJSON in EPSG3857: { "type": "Feature", "properties": {}, "geometry": { "type": "LineString", "coordinates": [ [ -13720479.997764934, 5688254.733325758 ...
0
votes
1answer
347 views

problem using proj4js and Leaflet to transform coordinates

Sorry, this question is really simple (my simple brain must be doing something stupid)... I'm trying to use proj4js with Leaflet to convert a mouse click event from WGS84 coordinates into British ...
1
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2answers
479 views

GDAL/proj4 equirectangular projection coordinate system units assumed by OGRSpatialReference and GDALDataset::GetGeoTransform()?

How do I configure my OGRSpatialReference object to specify an equirectangular projection system http://en.wikipedia.org/wiki/Equirectangular_projection where the affine geo-transform matrix (provided ...
2
votes
1answer
45 views

WGS84 CRS without elipsoid

What's the difference between using CRS defined as +proj=longlat +datum=WGS84 +no_defs and a CRS defined as +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs Will using one or the other pse any ...
2
votes
1answer
166 views

Choosing correct proj4string in R for a set of points

I was given a set of points which I eventually will overlay with a polygon shapefile in R. The issue is that the person who provided me with the points did not give them to in long/lat coordinates but ...
2
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3answers
354 views

How to find and apply reprojection parameters?

I have a data set in one projection, and a shapefile in another, and I am trying to combine the two. I am using Python. I apologize for posting a "help me transform coordinates" question on this site ...
4
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1answer
206 views

GDALWARP and OGR2OGR / CS2CS not agreeing on transformation

I am trying to transform some data (both raster and vector) from WGS84 to a Croatian Coordinate system defined by: +proj=tmerc +lat_0=0 +lon_0=15 +k=0.9999 +x_0=5500000 +y_0=0 +ellps=bessel ...
5
votes
2answers
753 views

Stereographic projection of WGS84 ellipsoid on a plane[python]

I would like to ask you for help in following task. What I need to do is to derive local x,y coordinates from latitude, longitude, applying stereographic projection of WGS84 ellipsoid on a plane, ...
2
votes
3answers
144 views

Can someone recognize the CRS?

I'm using QGIS 1.8.0 and have some shapefiles with a "User Defined CRS" which I don't recognize. Is anyone able to recognize it? Here is an image of the settings I see on QGIS. Thanks in advance. ...
3
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2answers
232 views

Convert file with coordinates, keep record ID

I have the following sample data: 345 -515561.05 -1166540.03 456 -515542.01 -1166548.76 999 -515519.61 -1166552.19 789 -515505.29 -1166550.25 321 -515477.05 -1166546.82 201 -515431.12 -1166534.06 197 ...
11
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2answers
429 views

Huge differences between results for 7-param datum transform

I'm trying to transform a WGS84 lat/lon point 11d42'32.10629" E 5d12'56.75371" S in three different software packages (Proj4, GeoTrans and Leica GeoOffice) but I receive very big differences ...
2
votes
1answer
99 views

How to do a raster reprojection in QGIS with custom map parameter

I'd need to reproject a raster dataset in a new customized projection, but I'm fairly new at both QGIS and GDAL and I'm not exactly sure about how to proceed and what the exact syntax is. The ...
2
votes
1answer
751 views

How to determine latitude longitude point from a pixel within a MODIS tile?

I need to know latitude / longitude of each pixel in a MODIS tile image in HDF in order to reproject from sinusoidal (MODIS) to mercator (Google Maps). I Can read values from HDF in my C++ program, I ...