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.

learn more… | top users | synonyms (1)

3
votes
1answer
5k views

Transforming from SRID 900913 to 4326 with PostGis

I have two Postgres tables with different SRIDs: 4326 and 900913. I want to convert the latter to 4326. I first changed the SRID using: Select UpdateGeometrySRID('table', 'geomcolumn', 4326). I ...
1
vote
1answer
43 views

GDAL GetGeoTransform returning lat/lng instead of affine co-ordinates

I'm using the GDAL libraries via the c# wrapper and have hit a problem when using geotiff's where the co-ordinates are from a state plane zone. Previously I was having trouble getting the correct ...
1
vote
1answer
47 views

Getting incorrect coordinates for ortho photo using GDAL libraries

I am very new to gis, and while most of the stuff I have is working well, this thing has me stumped. I'm using GDAL libraries and the c# wrapper to access various gis functions. I'm processing ortho ...
0
votes
1answer
315 views

How to transform/convert Coordinate Reference System with Proj4 and php

Basically my question is: Can I combine the functions of proj4 with php in my server? For example, I would like to know if it is possible get data in WGS84 and transform in ETRS89. I need to get ...
1
vote
1answer
30 views

QGIS georeferencer: Thin Plate Spline (TPS) residual

1) Is anyone able to explain in simple manner what does mean error exactly mean? I use metric values, so suppose 3.64109 is expression of meters and "e" is mathematical constant: ...
0
votes
1answer
22 views

Rotate Feature or Geometry Open Layers 3

I would like to programmatically rotate a feature (or its associated geometry) in OpenLayers3. I know I can rotate the view, but I'd like to apply the rotation to the feature/geometry only.
0
votes
1answer
29 views

Coordinate Transformation in Gdal/Ogr (EPSG:4326 to EPSG:3068)

I think gdal/ogr(/proj4) doesn't recognize epsg:3068 right? Here is what I tried: public static void transformSRS(){ // creating EPSG:4326 SpatialReference sourceSRS = new ...
0
votes
0answers
28 views

How to overwrite/change attribute values with QspatiaLite in qgis 2.6

I tried to work on the "tbl_datum_transform" table which is included srs.db data file. Just to let you know... i try to fill in the ntv2 - BETA2007 grid. How can i fill in something in the ...
0
votes
0answers
19 views

How to Transform Many Projections Into One With SQL Server

I know very little SQL Server, but am quite familiar with Arc and Python. The data I want to transform is point data which is in a single table [ID], [X] [Y], [COORDSYS]. There are 5 possible ...
6
votes
1answer
184 views

Moving a shape around the earth while maintaining the proper projection

What is the transformation needed to be taken on every data point of a shape to rotate that shape around the globe. I'm trying to figure out the math behind this kind of transformation so I can ...
3
votes
2answers
20 views

Do I need to transform wind vectors when changing projection from EPSG4326 to EPSG24373?

I have a set of points and polygons given in "normal" lat/lon coordinates EPSG4326, which I need to transform to EPSG24373. I can do this without problem using PROJ4. However, I also have wind ...
1
vote
2answers
48 views

Transform from artificial coordinate system to a real one

I have spatial data generated in an Archaeological excavation which is in an artificial coordinate system and I want to convert it to a "real" coordinate system. To do this I took real coordinates ...
3
votes
0answers
41 views

Why different transformation behaviour ArcGIS Pro 2D/3D layers?

I am working with ArcGIS Pro and have noticed a strange difference between the co-ordinate transformation of 2D and 3D layers. Here are my transformation settings: I have the same layer ...
0
votes
0answers
30 views

Auto-reprojecting (st_transform) SRIDs in Postgis

I have a postgis table that is edited from different sources. The points added from Source 1 are in SRID 23030. The points added from Soruce 2 are in SRID 4230. I want all the points in the table ...
1
vote
1answer
45 views

How to transform data from a custom projection in JTS?

I have some data in NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet I wish to programmatically transform the coordinates to Lat long in WGS84 datum using JTS. I know that JTS can transform the ...
1
vote
0answers
30 views

How do I compute uncertainties in the positions transformed using Helmert transformation?

I am familiar with Python, MATLAB and Mathematica. My data is given by Cartesian coordinates (positions in X,Y,Z (meters), standard deviations XX, YY, ZZ (meters) and a correlation matrix (XY, YZ, ...
0
votes
1answer
58 views

Converting between wgs84 and nad83

This is a newbie question that is about converting between wgs84 and nad83. I have aerial photos that I am trying to compute lat long coordinates for as closely as possible. There are several factors ...
4
votes
1answer
3k views

Convert Gauss-Kruger to UTM

How to covert Gauss-Kruger coordinates to UTM coordinates with GeoTools java library? As I have figured out the location (zone, country) is important. I need the calculation for Slovenia.
0
votes
1answer
84 views

Transformation data austria - slovenia

can anyone please help with fitting together these 2 shape-files? many many thanx https://www.dropbox.com/s/saa9yp7ecg1qxh1/Grenzen.rar
2
votes
1answer
145 views

Re-project from Polar projection to EPSG:4326

I simply want to project a polar stereographic raster (EPSG:3411) to Mercator (EPSG:3857) or WGS84 (EPSG:4326). The data I is from NOAA. $gdalwarp -s_srs EPSG:3411 -t_srs EPSG:3857 northpsg.20141027 ...
3
votes
1answer
84 views

Correct georeferenced LiDAR data

Often I obtain LIDAR data for concept studies and conventional survey (in dxf format) over a small portion of this. The LIDAR typically covers the broader area and is used for broader studies, ...
0
votes
0answers
32 views

Four parameter Helmert transformation using four points

I'm looking for an algorithm to calculate a Helmert transformation using four reference points. Plus, does anyone know how I can calculate the error once I've completed the transformation?
0
votes
1answer
24 views

Transforming a PNG from RD_new to WGS84

I got the request to transform a PNG in RD_new to WGS84. Is this possible? I was thinking of changing the accompanied world file its coordinates. I do not think it is possible to load in a png in a ...
3
votes
2answers
854 views

Coordinate system of a MODIS file to be introduced in GDAL for transformation

I am working on MODIS data using GDAL. When I extract coordinate system information of the files I got this: Coordinate System is: PROJCS["unnamed", GEOGCS["Unknown datum based upon the custom ...
4
votes
2answers
73 views

QGIS batch shp transform

I have a large number of shape files in OSGB (EPSG:7405), with no .prj file that I would like to convert to WGS84 (EPSG:4326). Can you let me know if this is possible in Qgis and, if so, how, and, if ...
1
vote
2answers
140 views

GDAL rotate DEM

Is it possible using any of the command line GDL tools such as gdalwarp, etc to perform a rotation of DEM data - a GeoTiff for example? Would I be better off converting (with gdal_translate) the ...
3
votes
1answer
451 views

Rotating rasters using GDAL Geotransform (and ArcGIS Desktop)

I am working on a GDAL driver for a proprietary grid-format. In some cases, the grids are rotated in order to get smaller file sizes. In my GDAL geotransform array, I do the following (showing a ...
0
votes
1answer
137 views

Rotating raster grids using ArcObjects changes cell size in ArcGIS Desktop?

I am using ArcObjects, namely RasterGeometryProc, to apply rotation on grids. The transformation works fine. However, when looking at the grids properties in ArcGis, the cell sizes has changed. ...
1
vote
1answer
68 views

Transform coordinates in MapInfo with GSB data

Does anybody know if MapInfo (or MapBasic) is capable to do coordinate transformation using the NTv2 (National Transformation version 2) method? Currently Switzerland changes their national ...
1
vote
0answers
23 views

Transforming Data using 2D Costum Transformation in Arcmap 10.2 for Desktop

I have ArcMap layers of roads, buildings etc. in one reference system (Israel_TM). I need to transfrom all this data (while keeping the topology) to pixel-space "reference system". I have already ...
1
vote
2answers
31 views

Shifting .dwg file to align with a shapefile

I'm trying to integrate data in a .dwg file collected by surveyors into an ArcView 10.2 project I have projected as NAD83 UTM Zone 10 N. The survey data is in an undefined coordinate system but I ...
2
votes
2answers
105 views

Digitized Shapefile manually using wrong projection: how to fix it?

I have a 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 ...
4
votes
1answer
261 views

Transform shapefile to WGS:84 (EPSG: 4326) in Qgis

I am struggeling with an enoying problem here. I received several shapefiles from an colleague that he told me is in WGS:84. If I look at the metadata in Qgis it tells me the following: In layer ...
4
votes
1answer
5k views

Transforming EPSG:3857 to EPSG:4326

I am new to gdal and have a simple question. I want to transform an image from OpenStreetMap projection to Nasa Blue Marble projection. What I understand is that OpenStreetMap projection is EPSG:3857 ...
12
votes
3answers
6k views

How to move vectors to specified coordinates in QGIS?

I have a layer of vectors located around, say, (100, 100), and I want to move them to new coordinate like (1000, 1000). How should I do it? Preferably using QGIS.
2
votes
0answers
87 views

Using ST_Affine() and trans_param() functions on vector layer

After reading this post How to georeference a vector layer with control points? I decided to give it a try to move/rotation/scale a polygon using Postgis. I have two polygons, polygon_from and ...
3
votes
2answers
298 views

Is there a vector affine transformation tool in QGIS2?

In QGIS 1.8, I can transform my point layer with the plugin "Affine transformation". So, this plugin don't exist in QGIS 2.0. Do you know a method to simply translate (i.e : X -> X+30000) in QGIS 2 ? ...
2
votes
1answer
771 views

Using Affine Transformation to expand polygons in QGIS

I have a shape file, and I'd like to grow each feature by 13.7% or 14%. The program crashes every-time I try to use affine transformation. Any recommendations? I don't have a license for ARCgis. ...
0
votes
2answers
75 views

Transforming Shapely Polygon and MultiPolygon objects

Is there an easy way of transforming Shapely objects (namely, Polygons and MultiPolygons) from one projection to another without having to dig around and extract coordinates by hand? In fact, I ...
1
vote
1answer
37 views

Aligning data in GCS_North_American_1983 and GCS_North_American_1927 using ArcGIS for Desktop?

I have tried everything that I have found on this site so far and nothing has worked! I have used ArcGIS for 3 years but had never had to mess with coordinate systems as the 1st company I worked for ...
0
votes
0answers
118 views

Coordinate transformation/reprojection using DotSpatial

need some help. The following piece og code worked with an older version of DotSpatial. public static Geometry Project_EPSG25832_To_EPSG3857(byte[] wkb, int SRID) { ...
2
votes
4answers
2k views

How can I transform some KML data to Sql Server 2008 using FME?

I've just downloaded FME 14 day trial. I'm trying to see how easy/hard it is to transform some KML data (a simple neighbourhood shape) into my Sql Server 2008 database using FME. I sorta don't even ...
5
votes
2answers
522 views

Transformation parameters for Everest datum to WGS84

I have a shapefile with the following projection information: ...
0
votes
1answer
96 views

Proper transformation file to go from NAD83 CSRS UTM 17 to NAD83 UTM 17

Looking to determine which transformation file to select when using the Project tool in ArcMap 10.2.2 to go from NAD83 CSRS UTM 17 and NAD 83 UTM 17. The data I am working with is from Geogratis and ...
2
votes
0answers
36 views

Geoserver : create a rasterized polygon / dynamic fill for polygons with features from database

I decided to post here because I couldn't find any answer to my problems on the internet. So I am using geoserver 2.7-SNAPSHOT, everything is working fine but I need to implement a new function or ...
1
vote
1answer
112 views

ITRF2008 to WGS84 Datum Transformation in ArcMap?

If I have data in IRTF2008 as shapefile is it possible to change this to WGS84 and how? The need for this comes when trying to display the data in a third party program that doesn't recognize the ...
3
votes
2answers
51 views

Compensating lat/long offsets after conversions

In my application I am doing conversions between two different formats of data. First format is a simple one containing NE and SW coordinates for a given rectangular area: area = { "sw": { ...
1
vote
1answer
45 views

how to transfer a geotif with WGS84 to a mercator array for ploting it with matplotlib.basemap

I want to plot data from a sensor raster file (tif) to a map using basemap. I have a geotif with 'WGS 84' >>> gtif = gdal.Open("example.tif") >>> print gtif.GetProjectionRef() ...
2
votes
1answer
90 views

How to export projected layers with relative cartesian (x,y) coordinates in ArcGIS

I've got several GIS datasets for a national park in South Africa (elevation map, water points, elephant density and such). I have access to the full ArcGIS Desktop Advanced suite, but am no GIS ...
2
votes
2answers
178 views

ArcGIS Desktop:Transformations: Geographic vs Projected?

Arc10. I have two data sets (both CSV files w/ lat and long columns) and I am working on standardizing them to the same projection. File1: NAD27; File2: NAD27, WGS84, and NAD83. I would like all of ...