A library for performing conversions between cartographic projections.

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How to get the extents of a spatial reference system?

In general, how does one get the valid extents of a spatial reference system? In particular, is there a way using the Proj.4 library? I attempted to use the information from the epsg.io website, but ...
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3answers
44 views

Generate Proj4 definition from given parameters

I'm an archaeologist and I'm struggling with the generation of a reference coordinate system for georeferencing the Spezialkarte der Osterreichisch-Ungarischen Monarchie (XIX century). I've found the ...
3
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1answer
109 views

Transform coordinate to EPSG:4978 fails

I am trying to transform a geometry to the EPSG:4978 projection. As the EPSG:4978 was missing in the spatial_ref_sys table, I have added it using the following query: INSERT into spatial_ref_sys (...
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1answer
19 views

proj4 fails to create projection with “+units=degrees”

basically my problem is that pj_init_plus works fine with +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs but fails with +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +units=degrees I ...
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2answers
38 views

Proj4js - no transformation for epsg2056

I have a script which converts local coordinates to WGS84. The script works fine if source data and source CS is epsg:21781. The CS for the data has changed now to epsg:2056. When I use epsg:2056 as ...
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55 views

projection from epsg:4326 to epsg:4258

I'm looking for projection functions to convert coordinates in 4326 to coordinates in 4258 and viceversa. Any suggestions?
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82 views

Converting a NAD27 Lambert Conformal Conic custom projection to WGS84 using QGIS

I am trying to convert some points from NAD27 Lambert Conformal Conic (custom projection) to WGS84 using QGIS 2.8.9. I am using the datum transformation parameters for El Salvador published here: http:...
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232 views

Transforming geostationary satellite image to lon/lat

The ICARE Data and Services Center distributes the SEV_AERUS-AEROSOL-D3 product in HDF5 format (http://www.icare.univ-lille1.fr/archive/?dir=GEO/MSG+0000/SEV_AERUS-AEROSOL-D3.v1.03/). The main ...
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87 views

How to convert from a local coordinate system to UTM (and vice versa) using mathematical expression

I have two coordinate systems- UTM Zone 23S and a local one with the following conversion from UTM to Local: EASTING: SQRT( (UTM_EAST-296787.355)^2 +UTM_NORTH-8095123.271)^2) *COS(ATAN((...
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105 views

How I can reproject a wms service in openlayer3?

I was trying to reproject a wms service from EPSG:25830 to EPSG:3857, but it didn't work. I read that it is not possible to reproject a WMS, only a WFS, It is true? It is the code <!doctype html&...
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58 views

Creating Proj4 string for local coordinates

I am fairly new to coordinate system conversion, so am rather lost on the following problem. We have been using Proj4 to convert between various coordinate systems which is fine for known coordinate ...
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38 views

“getting Unknown projection string error” serving EPSG:4326 tiles with open street maps mapnik renderd

The goal: I am attempting to generate map tiles with EPSG:4326 instead of web mercator by specifying EPSG:4326 in the mapnik style file srs attributes My current setup: I am running Ubuntu 14.14 ...
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2answers
118 views

Openlayers 3 connecting to a wms feed with a different projection

I am trying to incorporate a wms feed in the British national grid projection (EPSG:27700) into a openlayers 3 project. I initially had used this wms layer in an openlayers 2 application using the ...
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1answer
107 views

Georeferencing Himawari-8 in GDAL (or other)

Does anyone know the appropriate project information to georeference (and hence reproject) Himawari-8 AHI data in the IR? The images are 5500x5500 pixels. Currently I try these: ulx=-5570248.832537 ...
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29 views

Get pixel coordinates after Proj4 projction

I have a 3D surface and I want to project it to a 2D image(width * height). For every point of the 3D surface, I calculated the longitude and latitude. Then I use the Mercator projection of proj4. I ...
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20 views

Proj4 WKT - Cartesian with origin to EPSG900913

I'm converting wgs84 to cartesian with origin using simple function in c# public static double[] LL_TO_XY(double latitude, double longitude, double originLatitude, double originLongitude) { ...
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2answers
64 views

How can I convert the OGC WKT for Icelandic Lambert 1900 to Proj4

how can I convert OGC WKT to Proj4 string http://spatialreference.org/ref/epsg/3052/ PROJCS["Reykjavik 1900 / Lambert 1900",GEOGCS["Reykjavik 1900",DATUM["Reykjavik_1900",SPHEROID["Danish 1876",...
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1answer
76 views

How to use latitude/longitude with projection in R [duplicate]

I am using the SABS dataset: http://nces.ed.gov/surveys/sdds/sabs/ In particular, let's say I am using the "SABS_1314_High" layer. (This provides the school attendance boundaries for many US school ...
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1answer
358 views

OL3 How to reproject vector layer on fly (ol 3.14)

I have a map in OL 3.14 with a WMTS in a specific epsg. I add a WMS layer in an other projection and it's ok, OL reproject right. But with a vector Layer (geoJson, in the same projection as WMS), ...
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1answer
103 views

Rotating ~90° using Two-Point Equidistant projection with Proj4

I'm trying to rotate a tif raster in R using Proj4's Two-Point Equidistant projection - I think the only way to rotate spatial geometries to custom angles. But I'm finding the operation gets very ...
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1answer
47 views

ProjNet Nad 27 to WGS 1984 Results Incorrect

I'm fairly new to the ProjNet library and GIS in general so please bare with me. I have a set of coordinates from a EPSG:32038 system and I'm trying to convert to decimal Latitude and Longitude (WGS ...
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1answer
52 views

projecting onto Cartographic coordinates using Gauss Conformal Mercator in python

The shapefiles and boundaries I work with are on WGS 84 referenced to SA: GEOGCS["WGS 84", DATUM["World Geodetic System 1984", SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]], ...
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67 views

Why can't QGIS handle the Kavrayskiy7 projection although it is supported in proj4?

I'd like to make a world map using the Kravayskiy7, however QGIS seems to be unable to handle the projection, even though it is supported by proj4. 704900 (as is the EPSG for kav7) is not listed in ...
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89 views

Lookup Projection Name from EPSG with pyproj

Is it possible to programmatically lookup a projection's name (e.g. Albers Equal-Area) from its EPSG using pyproj? I see pyproj.pj_list, but it does not contain a mapping to the EPSG.
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2answers
62 views

What is the SRID of LCC projection?

I have a raster file with LCC projection and a point dataset with SRID 4326. I want to extract raster value to point. When I use the query SELECT ST_Value(rast, geom) val FROM testraster5, ...
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57 views

Display leaflet tile layer correct using custom CRS with proj4leaflet

I use a custom CRS to show the map of the north pole. There is a framework called PolarMap.js (http://webmap.arcticconnect.org/) which does this correct. My custom CRS however does not show it the ...
2
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1answer
105 views

proj4js: converting EPSG:3857 to SWEREF99 TM [closed]

I'm trying to convert a EPSG:3857(Google/OSM) coordinate to a SWEREF99 TM coordinate using proj4js but the following code produces a invalid result: sweref99 = "+proj=utm +zone=33 +ellps=GRS80 +...
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229 views

are these two proj4 utm projection strings equivalent?

I have a list of proj4 calls. Some of them have one format and some have another, I've been told they are equivalent. Is that so? If so, which one should I use? for example, for ETRS89 / UTM zone 20N:...
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117 views

Dotspatial.Projections with custom Proj.4 string

I have lat,long values that I need to convert to x,y in a custom Lambert Conformal Conic projection defined as +units=m +a=6371229 +b=6371229 +x_0=0 +y_0=0 +proj=lcc +lon_0=0 +lat_2=25.0 +lat_1=25.0 +...
2
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1answer
138 views

Using Proj.4/GDAL to convert lat,lon to i,j

I'm working with a data set in GRIB2 format and need to determine the grid cell index (i, j) corresponding to a given lat,lon. I have the projection definition in the form of projparams as follows: {...
3
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107 views

Creating custom CRS based on local project parameters in QGIS?

I'm having trouble creating custom proj4 CRS files to work with existing .shp files on local project coordinates. (Local in that the coordinates are relative only to themselves and not the 'real world'...
2
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3answers
118 views

Converting GeoTIFF projection definition to proj4

I'm working with las/laz files which often have GeoTIFF information attached to them. However, for further processing I need proj4 definitions. http://spatialreference.org/ has helped me so far to ...
2
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1answer
68 views

gdalwarp leaves big hole at 180° longitude when warping from 4326 to custom AEqD

I'm trying to reproject the Natural Earth I 1:50m raster into an Azimuthal Equidistant projection centered on my hometown. As you may know, the source raster covers from -180° to 180° latitude, and -...
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1answer
425 views

Openlayers3 using custom EPSG:25832

I want to use EPSG:25832 as the default projection for all my layers. The projection is not working correctly because the Position (center point) should be in Germany but I end up in France. When I ...
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38 views

Proj4 string for Hobo–Dyer projection?

I was fortunate to find an SVG of this projection at http://bl.ocks.org/mbostock/raw/4476487/ However, there appears to be little reference to this projection outside of wikipedia. Does anybody know ...
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37 views

Transform itrf96 to web mercator 900913 proj4s

I am using cached basemap tiles with itrf96. proj4 version is like this: Spatial Reference Page +proj=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=500000 +y_0=0 +ellps=GRS80 +units=m +no_defs I want to ...
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39 views

How to create raster with origin in degrees and dx dy in metres

I need to create a raster from array. In gdal if i understand correctly i need to specify the top left lat lon for the SetGeoTransform((originX, pixelWidth, 0, originY, 0, pixelHeight)) however the ...
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39 views

Projected Coordinate System issue using GDAL and qgis when defining x and y

I have a numpy array which I would like to save as GeoTiff using GDAL in python. The array was created using the following PCS in mind: +proj=lcc +lat_1=48 +lat_2=48 +lat_0=48 +lon_0=0 +x_0=0 +...
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165 views

Problem reprojecting LiDAR data using liblas

I have multiple lidar data sets and I am trying to reproject them using liblas. They are missing the coordinate system in the header information so I assign them an SRS using las2las --a_srs: las2las ...
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22 views

Geographic projection for ASCAT metop-a product

I have an ascat bufr over souther south America and I need to project raster data over a map. What is the right projection for this product? I'm lost with this options: ortho, mercator and ...
2
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1answer
93 views

Reproject “unknown” coordinate system to LCC 2SP across lon 180

Starting with a grib file with limited projection information, I am trying to import it as a GeoTiff in Geoserver 2.7.x. The original gdalinfo is: Size is 218, 81 Coordinate System is: GEOGCS["...
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45 views

Old MIller projections Bipolar Oblique Conic Conformal/Oblated Stereographic definitions?

I'm attempting to georeference and warp some old toposheets that are various old projections including the following: Miller Oblated Stereographic Projection Bipolar Oblique Conic Conformal What's ...
2
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1answer
116 views

What Proj.4 parameters have to be modified if the Y coordinates are shifted?

I would like to transform Barcelona map coordinates to Latitude, Longitude with Proj.4. I'm using EPSG number 23031 and the parameters are: +proj=utm +zone=31 +ellps=intl +towgs84=-87,-98,-121,0,0,0,0 ...
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57 views

Getting wrong values trying to convert to a latitude longitude system

By using listgeo I got the following information: PCS = 31468 (name unknown) If I am not mistaken this translates to DHDN / 3-degree Gauss-Kruger zone 4, and by using this site I got a proj4 string:...
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10 views

Sequencing addresses found in search

My dealership search is powered by a java listing and functions script. When the dealers are found for a chosen town they come up in a random order. My client wishes the biggest dealership to appear ...
2
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1answer
171 views

Proj4 for EPSG3857

I am using leaflet and the R library sp. The CRS from my leaflet map is EPSG3857 - WGS84 Web Mercator. I am retrieving the coordinates of my current map view with getBounds(). For further calculations ...
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112 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 ...
3
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2answers
207 views

How can I convert points in EPSG:2956 to EPSG:4326 with pyproj?

I have some points in EPSG:4326 -110.28879750 64.46310187 405.49938863 -110.28879359 64.46310086 405.45967110 -110.28880175 64.46310446 405.93823604 -110.28880245 64.46310258 405.48060850 -110....
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47 views

Wrong parameters for ESPG:42304?

I need to use the Lambert Conformal Conic for Natural Resources Canada EPSG:42304, which I could not find in QGIS 2.10.1 CRS list. I located the proj4 parameters on-line from three locations, all of ...
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1answer
106 views

How to project from Greek Grid to ETRS LAEA

How to make a project transformation between Greek Grid (EPSG:2100) to ETRS LAEA L52_M10? I'm using ArcGis 9.3.1, but when I use the project tool, it don't have anything in "Geographic Transfornation"...