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Questions tagged [proj]

A library for performing conversions between cartographic projections.

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proj: Oblique Mercator specifying two points on central line

I'm trying to use Oblique Mercator in QGIS 3.4, which uses proj to calculate coordinates conversion. I specify two points in the central line, rather than specifying the center and alpha. Oblique ...
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1answer
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Creating custom CRS from existing CRS EPSG:22780?

I am currently trying to figure out how to create a custom CRS in QGIS based on Deir ez Zor / Levant Stereographic (EPSG:22780). For this I am working with a map which shows both the EPSG:22780 ...
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Transforming coordinates using R - SWEREF to WGS84

I have some coordinated in SWEREF 99 TM which I cannot convert into WGS84 using the proj4 package in R. temp <- data.frame (x = c(598223, 598812, 598824, 598232, 597614, 597629), y = c(...
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Are Azimuthal Equidistant and ESRI:54032 the same thing?

I am looking at (A): https://proj4.org/operations/projections/aeqd.html#cmdoption-arg-ellps and (B): http://epsg.io/54032 Description: +proj=aeqd +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +...
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Calculating tile coordinates based on location and crs for ArcGIS maps?

I am working on a solution to download map tiles based on given location:(latitude, longitude) and zoom level Followed https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames The key concept is ...
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2answers
234 views

Build gdal with proj version 6

Description of the issue: Building gdal from sources after having build proj in its latest version is failing at the configure step because it's not finding proj 6. Details to reproduce: Work ...
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1answer
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Get proj4 parameters from EPSG in C++

I have the EPSG number of the projection and I want to use proj4 to get the projection descriptive string (like +proj=lcc +lat_1=49 +lat_2=44 +lat_0=46.5 +lon_0=3 +x_0=700000 +y_0=6600000 +ellps=GRS80 ...
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1answer
26 views

MapProxy doesn't start with EPSG:28992 while it starts and works fine with EPSG:4326

We are moving from Debian to CentOS and in that process we discover that MapProxy installation is turning out tougher in CentOS than it was in Debian. One of the dependencies 'libproj' is not ...
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26 views

Creating a custom “flat” projection definition in proj4

I want to create a simple, custom projection in proj4. I need it to be completly flat ( rectangular coordinates ). Starts in point (0,0), meters as unit, everything else - as simple as possible. What ...
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1answer
24 views

Managing custom projections

I am developing a mining sampling database. There will be many project specific, user created projections. Typically they will be Oblique Mercator defining a local coordinate projection system. ...
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Create a Non-North/Rotated-Vertically User Coordinate System?

I need to plot 3d PostGIS data into vertical planes for symbolization and drawing vertical cross-section interpretations for mineral exploration models. I have written a short plpgsql function that ...
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1answer
55 views

Lambert conformal conic alternative projection in PROJ4

What's the difference between Lambert conformal conic projection and Lambert conformal conic alternative projection in PROJ4?
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31 views

UTM to latlong in R - with proj4

I have received a shapefile with measurement points to be analyzed, but no matter how I try, I can't find how to convert to lat lon. I suppose it would be good to know the projection but when I look ...
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18 views

Coordinate system transformation deviation [duplicate]

I'm having the same problem as described in this Question from September 2018. Has it ever been answered satisfactorily? I'm attempting to transform from EPSG 3785 to 4326. The X coordinate output is ...
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Transform coordinate from rotated lat/lon to normal lat/lon WGS84

I have acces to an OPeNDAP service that allows me to peek into a humongous ocean wave dataset. It takes latitude and longitude as inputs (in fact even a range of the two) - but the coordinate system ...
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1answer
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Are proj4 strings case sensitive? [closed]

Is there any reason that case of characters in Proj4 strings would affect their interpretation? Before parsing a Proj4 string, can I lower case all the characters first?
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Understanding proj4, epsg and esri *.prj in depth? [closed]

Where can I find a good resource that teaches me 1) about the difference between proj4, EPSG and ESRI *.prj? (Why do several coordinate system definitions exist? When should I use which? How are they ...
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WFS how to consume with different coordinate system? [duplicate]

I have a WFS in EPSG:4167. My map view has EPSG:3857. How to make the WFS work on a map view with different coordinates? I used this to define my coordinate system from wfs: import { register } ...
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2answers
85 views

Creating generic coordinate system in QGIS

So I'm new to QGIS (3.4) and haven't touched any mapping software in 15 or more years. I'm slowly finding my way around but I'm currently struggling to create a generic coordinate system for a map ...
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1answer
100 views

Is MODIS sinusoidal tile boundary in Eathdata website real?

I was using MOIDS data MCD12Q1 (MODIS/Terra+Aqua Land Cover Type Yearly L3 Global 500m SIN Grid V00). I try to use PyProj in Python to transform the Sinusoidal projection to lat/lon. It actually ...
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2answers
155 views

Convert WKT coordinate reference system to PROJ4

I'm currently working on a better support of LAS 1.4 file format in the rlas R package. In LAS 1.4 format the CRS of the point cloud can be stored as a WKT string. For example this is what I read from ...
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1answer
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RSAGA error using rsaga.pisr2

I just downloaded SAGA and the RSAGA package for R. I would like to use the rsaga.pisr2 function to compute solar radiation for my region of interest. I am currently getting errors related to proj4 (...
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Gdalwarp producing odd results around 0 degree longitude

I am warping ECMWF grib data (full globe, 0.25 degree resolution) to match the SEVIRI geostationary satellite projection. I use this command: gdalwarp -overwrite -ot Float32 -t_srs "+proj=geos +a=...
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How to import a data with unknown coordinate system to a data with known coordinate system [duplicate]

I have recieved a Group of shape files with unknown coordinate System. The coordinates are like: 536605 , 5658923 and I can not find the corresponding projection/coordinate System. It looks like that ...
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1answer
49 views

What parameters do azimuthal and transverse cylindrical projection in secant case have as proj4 string

conical equal-area projection, secant case has e.g. +proj=aea +lat_1=... +lat_2=... +lon_0=... +lat_0=... +x_0=... +y_0=... etc... I would ask if there is such thing, for transverse cylindrical ...
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Why is proj version dated in the future?

I compiled proj (also known as proj.4) from sources on Ubuntu (https://github.com/OSGeo/proj.4.git). I now wonder why is proj version dated in the future? E.g.: $ proj Rel. 6.0.0, March 1st,...
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Accurate area calculation for countries worldwide individually [closed]

I have polygons of countries with its administrative divisions, I would calculate the areas of each division in a country accurately. I got the bounding boxes for each country, then I divided its ...
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2answers
91 views

Hammer projection in GDAL

I am working on Ubuntu 18.04 with PROJ 4.9.3 and GDAL 2.2.3 (installed from the ubuntu-gis PPA). In a previous question on Hammer's projection in QGIS it was concluded that with older PROJ versions ...
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0answers
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Create custom projection for Shapefile, given specific target coordinates [duplicate]

I have a somewhat odd situtaion. A client has provided me with a Shapefile that has no projection information, along with an image of the map that it corresponds to. I have run some coordinates ...
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32 views

Fishnet programmed in python does not display correctly in ArcMap but displayed correctly in QGIS

I programmed a fishnet in python to use as a reference map for georeferencing. I am facing the following issue: The fishnet is not displayed correctly in ArcMap 10.5.1. The fishnet has parameters lat-...
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1answer
115 views

Handling raster data in a “rotated pole projection” with R?

My question is about using R to transform raster data from a rotated pole projection to a regular latlon grid - and then plotting it. I am working with data from a numerical weather model, which is ...
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1answer
338 views

Converting NAD83 (epsg:4269) to WGS84 (epsg:4326) using pyproj

I'm trying to convert US census data (NAD83) to WGS84. I know the difference between the two is quite minor, but trying to apply the transformation using pyproj does not do anything. e.g.: from ...
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1answer
119 views

Can't perform Helmert transformation in Proj.4

I'm trying to convert a point from one SRS to another using proj4 strings and GDAL. My origin SRS uses Helmert transformation to convert point to EPSG:2229 so I tried to use pipeline operator (https://...
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1answer
76 views

Moving MS4W from Apache to IIS

I'm trying to switch to IIS on my MS4W MapServer install. It works fine in Apache but on IIS I get: msProcessProjection(): Projection library error. proj error "no arguments in initialization list"...
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Different ways of NTv2-Grid integration

In QGIS there is an entry in the tbl_datum_transform for a NTv2-grid called BWTA2017.gsb ( https://github.com/qgis/QGIS/pull/6980 ). So theoretically it would be enough just to activate the option "...
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Rotating North in Custom CRS using proj4?

I'm trying to create a CRS for a local mine grid that involves the translation and rotation of GDA94 / MGA zone 55. The origin is translated 2195129.073 in the +x direction and by 5489615.789 in the +...
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2answers
167 views

How to create proj4 definition of local coordinatesystem

i have to generate a proj4 definition string from affine transformation parameters (A-F). For example: I have a local coordinatesystem based on EPSG:31466 The affine parameter are: A = 0....
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1answer
52 views

Install PROJ 5 on Linux without compiling

I would like to try PROJ 5 to understand if it solves some issues with version 4. The documentation states the following regarding Linux: How to install PROJ on Linux depends on which distribution ...
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1answer
394 views

Integrating NTv2-transformation in QGIS?

I am wondering what's the correct way to integrate a NTv2-transformation in QGIS. I have successfully integrated a NTv2-transformation in QGIS but I am not sure if it's done the way it's meant to be. ...
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1answer
66 views

What is the history behind WKT and proj.4? [closed]

What is the history behind WKT and proj.4 formats for defining coordinate systems? Does one have advantages over the other? Why do both exist? I'm guessing they were developed independently for ...
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2answers
236 views

PostGIS 2.5 error while compiling from source on Ubuntu Server 18.04

I'm compiling PostGIS 2.5 from source on Ubuntu Server 18.04 The server had no internet connection due to client requirements, so I've been following PostGIS 2.5.1dev Manual, 2.4. Compiling and ...
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1answer
25 views

Changing decimal places of X,Y coordinates using proj.4?

How do I change the accuracy of the output coordinates X,Y in the Proj.4 library (version 4.9)? In accordance with the manual I tried: proj +proj=poly -f '%.4f' +R=1 However, for lat=lon=50, the ...
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2answers
319 views

ProjNet. Coordinate reference system transformation deviation

I have a project with C# that contains a CEFSharp viewer showing a webpage with a map that I've created.I'm trying to add a marker in the map sending the parameters from C# to a function in the ...
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3answers
818 views

Adding Equal Earth Projection in QGIS?

There is a new accurate projection for world maps ► Equal Earth. I know its proj4 but I can't add it in QGIS (see below). Does it need some kind of QGIS update?
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1answer
132 views

Hammer projection in QGIS

I would like to use Hammer's projection in QGIS. I am providing the follow proj string: +proj=hammer +lat_0=0 +lon_0=0 +datum=WGS84 +units=m +no_defs But QGIS complains that it is invalid: ...
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1answer
141 views

PROJ.4 in QGIS Helmert

I am trying to create with PROJ a custom CRS in QGIS 3.2.0 - but I fail. I have a local, cartesian coordinate system and a transformation report (2D-Helmert) with the following parameters: ...
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0answers
120 views

How to properly implement EPSG: 27700 using vector tiles in Openlayers 4 and Geoserver

I am trying to get pbf vector tiles which are served by Geoserver to properly render in Openlayers 4 using the code below: <!DOCTYPE html> <html> <head> <title>Vector tiles&...
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1answer
204 views

Angular rotation using Proj4, for local coordinate system

I have a polygon feature on map to which I need to transform the coordinates to local coordinate system with respect to new origin while keeping the same datum. So far using the Proj4 library and by ...
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0answers
82 views

How to project to oblique Mollweide

I know how to produce a map with the Mollweide projection, both using QGIS and R (I'm most interested in doing all of this in R). The proj4string that I've used in R is +proj=moll +lon_0=0 +x_0=0 +y_0=...
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321 views

No handlers could be found for logger “shapely.geos”

I have the following code to get area of polygon using shapely and pycrs. I was able to run this code successfully in a jupyter notebook but when I incorporate it into my main code, I had an error ...