The process of converting the coordinates of a map or an image from one system to another, typically by shifting, rotating, scaling, skewing, or projecting them.

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403 views

From Bessel 1841 to WGS 1984

I am having problem with projecting my counties which are in GSC_1841/Hermannskoegel to WGS_1984 in ArcGIS 9.3. I tried the basic "project" with importing the existing coordinate system but that's ...
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2answers
222 views

Convert 3D WKT to 2D Shapely Geometry

I have the WKT of many linestrings which contains three dimensions, however my script only requires a two dimensional linestring and I therefore want to discard the third dimension. My current code, ...
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0answers
34 views

How to convert unreferenced Map Tiles to Referenced Map Tiles

To introduce you: Starting situation is a mobilemap packed in one zip folder. The Maptiles(256x256 pngs) start with a zoom s0 to s8 (in folder s0 is one png in s1 are 4 pngs in s2 are 16pngs..), but ...
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1answer
2k views

How can I convert/transform coordinates from ETRS89 to WGS84 Utm 36N in QGis

I am a student and just getting to know qgis. At the momment I have to combine data which had been measured in ETRS89 with data in WGS84 UTM 36N. I created several vektorlayers for the data in ETRS89. ...
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2answers
148 views

GeometryServer > Project with Datum Transformation

I am facing the problem that when i use the extent in the url and i go from Amersfoort(WKID 4289) to WGS84(WKID 4326) that without the tranformation the point from longitude and latitude is placed ...
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1answer
202 views

Programmatically manipulate GPX data

I need to do the following in Python open OSM & GPX files (I have packages for this) transform points from GPX (like stick a track to roads) calculate the results (distances, cumulative ...
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votes
3answers
344 views

generate spatial geom from lat lon points for map in PostGIS

I am interested in a PostGIS implementation of the R-based soulution from a previous question, How can I convert data in the form of lat, lon, value into a raster file using R? Currently, I am hoping ...
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0answers
67 views

calculation of transformation parameters in qgis

How to calculate transformation parameters like scale, rotaion, translation in qgis for performing affine tranformation?
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1answer
377 views

Transform regular lat/lon to rotated lat/lon

I am currently working with climate data projected in a rotated lat/lon grid and came across this excellent 'cookbook' by mkadunc on how to manually transform rotated lat/lon to regular lat/lon: ...
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33 views

calculation of transformation parameters [duplicate]

how to calculate transformation parameters like scale, rotation, translation in qgis?
4
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1answer
315 views

Experiencing transformation anomalies when performing a Save As to convert coordinates between NAD83-Z14 and NAD27-Z13

Good morning all: I have recently discovered QGIS and have been hoping to find a solution for converting bacthes of xy coordinates between two projection systems for our mapping system. I have known ...
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1answer
106 views

Geographic Transformation

I have an Image with the following metadata: Projection Information : Projection Zone : 0 Spheroid Name : Modified Everest Georeferenced to : RSO Map Information : Upper Left ...
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1answer
227 views

geotools / jts crs transformation result not at correct position

I copied the example from geotools, which shows how to transform a shapefile into a different projection. (http://docs.geotools.org/latest/userguide/tutorial/geometry/geometrycrs.html) But when ...
5
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1answer
148 views

How much error in a transformation?

I've been working in GIS for about a year and have a functional grasp of Projections and Transformations from within ArcGIS (10.0). Geosoft Oasis is another program we use. In working with our data ...
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1answer
52 views

How can I transform geometry data to bounds?

My SRID is 3137 and I want to transform geometry data(e.q : "0101000000904160258CC91841C8073D6723545141") to bounds. I need to bounds coordinates for use in maxExtend() function. Help me please!
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0answers
47 views

How to snap Vector Layer projection to Raster layer projection in QGIS?

I have raster in correct projection. I used ShapeFiles, and marked objects(manually), but i found out that my vector layers have different projection, so they have different size and position. Is ...
5
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1answer
586 views

Python - OGR: Transform coordinates from meter to decimal degrees

I have a point in a shapefile. The shapefile is in a WGS_1984_Web_Mercator Projected Coordinate System. I want to get the coordinates of that point in decimal degrees with GDAL/OGR in Python. I am ...
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1answer
175 views

“Request contains a format not offered by the server.” Error when using CRS transformation with WMS in QGIS

When I try to load a WMS layer which has a WSG84 as a default projection and use a CRS transformation on it, it gives this error message: Request contains a format not offered by the server. The WMS ...
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0answers
32 views

Total station problem [duplicate]

I have total station data in local coordinates in excel format. Now i want to transform it into global coordinate (in utm) to correctly overlay on the actual place. What is the method?
2
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1answer
200 views

ArcGIS JS API Polygon's WKID conversion with gsvc.project

I'm trying to convert polygon from wkid 3301 to wkid 4326. I've been using this code snippet for converting points, but I'm not sure how I would accomplish this to create a polygon object. I'm not ...
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0answers
87 views

Geokettle transformation for FileGDB to SHP

I want to transform FileGDB layer to Shapefile on Geokettle. Firstly i added OGR Input and than i added a Shapefile Output. And i entered parameters shown on the screenshot but i got errors for ...
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1answer
443 views

PROJ4 C++ API: Amersfoort RD New to WGS84

I try to convert between dutch RD New (EPSG:28992) and WGS84 (EPSG:4326) via PROJ4 C++ API. On the console this works with: cs2cs +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 ...
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2answers
113 views

Performance loss for OpenLayers EPSG transformation? Storing GeoJSON coordinates in lat/lon or in native map projection?

For a project the map projection is EPSG:32468 (tiles). On top of the map, two or three GeoJSON LineStrings should be displayed using OpenLayers. Each LineString has about 1500 coordinates. ...
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0answers
47 views

How to identify grid shift file used by osgeo in Python?

I wrote a Python script reprojecting points from a source coordinate reference system (SCRS) to a target one (TCRS) both identified by an EPSG code. I would like my python script to retrieve details ...
2
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1answer
188 views

Transformation of user-defined projected coordinatesystems

I want to transform from one projected coordinate system (pcs) to another using ArcGIS 10. Unfortunatelly the starting system is not predefind by ESRI and thus I´m not sure the software is doing what ...
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2answers
281 views

How do I perform a 3 parameter geotransformation and projection in Sql Server 2012?

I have a table with latitude longitude (NAD27) columns in it. I compute two other columns, X and Y, representing Web Mercator (WGS84) location. Currently I'm using a Arcmap to do this, by applying ...
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2answers
362 views

Where is list of Geographic Transformations in ArcGIS, and their areas of applicability?

I have some data in Provisional South American Datum 1956, and I need to project it to Web Mercator with WGS84 as the datum. When I use the project tool in ArcGIS desktop, it requires a Geographic ...
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2answers
155 views

Lambert projection with one or two standard parallels and proj4

I'm sure there is a gap in my understanding, but I haven't been able to identify where it is, nor how to fill it. My issue is this: I'm transforming lon lat coordinates into a lambert conformal ...
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1answer
112 views

Projection WGS 84 is slightly displaced referring to a hillshade in QGIS

I have a hillshade and a vector layer. The vector layer is slightly displaced referring the hillshade. About lat=100m and long=175m The CRS of the project is EPSG:3397 - PD/83 / Gauss-Kruger zone 4. ...
4
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2answers
492 views

Cartesian world sized projection WKT/EPSG code?

I am after the EPSG code or Well Known Text (WKT) of a projection that puts the centre of the earth a 0,0,0 and each point is a cartesian XYZ distance from that. My existing data is in WGS84 ...
2
votes
1answer
128 views

Setting coordinate systems in QGIS: “transform error caught”

I'm learning how to use QGIS (v 1.8.0 "Lisboa") on Mac OS 10.6.8. My goal is to create a simple county map of Illinois using the base data shapefiles available from the Illinois Natural Resources ...
6
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1answer
251 views

locating latitude-longitude point in a piste-map with matrix transforms

I am trying to plot points of a particular latitude longitude on this image of a Swiss mountainous landscape. What I am doing is I have some 54 known location-points plotted on this image (not ...
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1answer
155 views

How to reproject this vector layer?

I have a dxf file and use this tool to convert it to shapefile. Then I apply some affine transformations and get a shapefile that does not fit the shapefiles downloaded from osm (EPSG:4326). I know ...
2
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1answer
410 views

ArcObjects 10.1 .NET Convert Point from WGS1984 to OSGB1936

Please can someone help me convert a point in WGS1984 to OSGB1936, I have followed all the documentation (or so i think...) and yet have not made any headway into this problem. This is my code : Type ...
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2answers
373 views

What's the best projection for rasterization of random latitude and longitude data in the northern Atlantic?

I have a dataset in the WGS84 geographic coordinate system that I would like to interpolate along a grid using Python. It appears gdal_grid is not available through the Python bindings, so I plan to ...
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1answer
65 views

How does ogr2ogr determine which transformation to use and how big would the introduced error be?

I want to convert TIGER data GEOGCS["GCS_North_American_1983", DATUM["North_American_Datum_1983", SPHEROID["GRS_1980",6378137,298.257222101]], PRIMEM["Greenwich",0], ...
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0answers
150 views

How to use CropCoverage Render Transformation in Geoserver SLD (WPS)? [closed]

I have yet to find an example on the web (or in code) of anyone using the "Crop Coverage" Render Transformation from a Geoserver SLD. Does anyone have an example or at least be able to point me to ...
2
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0answers
595 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 ...
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0answers
298 views

ArcPy 10.1 PointGeometry.projectAs()

I'm trying to reproject an X,Y passed in from an Add-in. So far this works fine: pointGeometry = arcpy.PointGeometry(arcpy.Point(x,y),srIn,False, False) projectedPoint = ...
3
votes
1answer
530 views

getting the specified geographic transformation, or at least the GCS, of a data frame

First, the TLDR digest: I'm getting a bogus value from dataFrame.geographicTransformations on some machines; how do I get the correct value as shown in the properties dialog? and/or Given a spatial ...
2
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1answer
780 views

Openlayers Transform not transforming a point from EPSG 27700 to EPSG 4326

I am trying to add Google street view functionality to a Openlayers Map. I have started by using 3 divs to hold the Openlayers Map (which uses a local tilecached base map), a google api map and ...
2
votes
1answer
56 views

OSGB conversion error

So I am using ArcGIS 10 and trying to work in British National Grid. My shape file is in WGS84 UTM30N. By chance I passed the shape file across to a colleague and we both transformed into BNG. When ...
2
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0answers
101 views

What's the difference between CRS 4326, CRS 4978, and CRS 4979?

CRS 4326, 4978, and 4979 are all based on WGS84. 4326 is called "geographic 2D" 4978 is called "geocentric" 4979 is called "geographic 3D" What are the differences between these three? And why ...
9
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1answer
580 views

How can I see the coordinate transformation parameters in QGIS?

How can I see (and edit if possible) the transformation method and parameters used by QGIS for "on-the-fly" transformation, and then for saving data in another CRS? Like in ArcGIS? Here is the ...
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1answer
167 views

Terrasolid - How to define spherical mercator (EPSG: 3857)

Im trying to define the srs EPSG 3857 inside Terrasolid sofware. I ran into a problem because the definition of the reference ellipsoid is given with a major axis and inverse flatening, not via both ...
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1answer
93 views

Problem transforming projection on outlying features from shapefile [closed]

I am fairly new to GIS data and as such please feel free to ask for extra data I might not have provided. I have some regional data from Natural Earth, more specifically this: ...
3
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2answers
363 views

How to transform coordinates to location in x-y grid in R?

I have a polygon with a 40m diameter and several points that lay inside it. Now I want to reformat the point locations (projected in DHDN/GK-3, but could vary) to x-y coordinates ranging from zero to ...
2
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2answers
369 views

How to create a “Datum-less” projection in QGIS?

I want to use QGIS to do some georeferencing and image registration. On ArcMap10 I can define an "Unknown Projection", basically a default metric grid, and use it as a grid for georeferncing. In QGIS ...
2
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0answers
137 views

projection discrepancy with gdal (1.9) and proj4

I boiled the problem down to that python example: import sys try: from osgeo import gdal from osgeo import osr except: import gdal import osr if __name__ == '__main__': version_num = ...
2
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2answers
152 views

Coordinate system of a raster file to be introduced for transformation

I am working on raster data using GDAL. When I extract coordinate system information of the files I got this: PROJCS["Geostationary_Satellite", GEOGCS["GCS_Unknown datum based upon the custom ...