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)

0
votes
1answer
349 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 ...
0
votes
0answers
20 views

Is it possible to put a raster layer on a shifted Chinese basemap using leaflet API?

Recently, we want to develop an application with leafleat and gaode basemap because some features of these products fullfill our basic needs. We want to overlay some raster layers caculated by spatial ...
-1
votes
1answer
57 views

Formula to convert from WGS 84 / UTM Zone 34N to WGS 84?

Can anyone help me with the formula for converting from WGS 84 / UTM Zone 34N to World Geodetic System? My problem is I want to represent some properties (polygons) in some kind of a map (image). I ...
1
vote
1answer
50 views

How to project WGS84 raster in lat/long to WGS84 UTM in ArcMap 10?

I know this is suppose to be simple and I've found similar questions. However when I try to do the same (data management tools > projections and transformations > raster > project) inserting input ...
4
votes
1answer
35 views

Changing the projection transformation for a feature class after adding it to an mxd

Is there a way to select a different projection transformation after you've added a feature class to an mxd? I have a pretty complex mxd set up to use as a map service where the original data is in ...
0
votes
1answer
744 views

Geographic Transformations using ArcPy vs. Coordinate Systems used by ArcGis online basemaps

I have three shapefiles with undefined projection, but I know which one was used (Lisboa_Hayford_Gauss_IPCC). I need to first Define Projection. It works. I then need to transform it to WGS_1984, so ...
1
vote
1answer
52 views

Transformation accuracy or offset in ArcMap?

I'm trying to transform a map from UTM ED 50 zone 33N to WGS84 and vice versa in ArcMap 10.2.2. I'm doing this by using the Project tool in the Arc toolbox and choosing the ED_1950_TO_WGS_1984_12 ...
6
votes
1answer
206 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 ...
0
votes
0answers
26 views

Linear units do not correspond after georeferencing map?

In ArcGIS 10.1, I georeferenced an archaeological settlement plan. The georeferecing was made identifying Ground Control Points on the online aerial imagery provided by ArcGIS itself. 4 GCP were used ...
0
votes
0answers
34 views

Satellite Image of same projection system , do not overlap

I have two satellite imagery with same projection system i.e. QND_1995_Qatara_National_Grid as Spatial Reference and D_QND_1995 as Datum. Satellite Image A) Received in WGS84 and converted it to ...
0
votes
1answer
200 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) { ...
1
vote
0answers
55 views

How does OpenLayers 3 handle coordinates?

Ol3 always uses the flatCoordinates because obviously it needs 2d-coordinates as the screen is only 2-dimensional. But how does OL3 calculate the flat representation? For example if my view’s ...
0
votes
0answers
7 views

Error in using gdal java binding

I am using the java binding of gdal to project a set of coordinate points from UTM to lat/log using the CoordinateTransformation Class of gdal. I have written the code as follows: ...
0
votes
1answer
171 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 ...
1
vote
0answers
48 views

Why does the transformation bring bad results?

I have this map which has a polygon drawn on it. For the background map I use a WMS via ol.source.TileWMS and the polygon uses a ol.source.Vector object. Normally my view projection is EPSG:31467 but ...
1
vote
1answer
12 views

Geosoft Oasis Montaj Local Datum Transform - What is the purpose of this parameter?

When defining a coordinate system in Oasis Montaj one of the parameters is "Local Datum Transform". Is this the coordinate transformation definition to convert the defined coordinate system of a data ...
0
votes
1answer
159 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 ...
3
votes
2answers
216 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? Anyone know how to do this? UPDATE1 After clearing out ...
3
votes
1answer
69 views

Misalignment of EPSG:4326 and EPSG:3399 coordinates

I'm having a QGIS project in local coordinates (Gauss-Kruger, EPSG:3399) with some layers in the same reference system. On top of that, I want to display point coordinates, which I digitized using ...
0
votes
0answers
18 views

Precise aligning of two web layer

In Arcmap I add basemap from arcgis server (arcgisonline.com). On top of it I add another layer from a regional arcgis server which is in Bessel 1841 coordinate system. In this case Arcmap shows ...
1
vote
1answer
52 views

pyProj Coordinate Transformation Incorrect

I'm using pyProj to transform extents between two different geographical systems. In a case when both my systems are the same I expect to get back the same extents as inputted but this isn't happening ...
0
votes
0answers
14 views

Misaligned layers unknown projection [duplicate]

I have two datasets for Rio de Janeiro, Brazil that come from the same original dataset and are almost exactly the same. However, one has been projected into an unknown projection. Both were at some ...
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
75 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
66 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 ...
1
vote
1answer
55 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
38 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
58 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
29 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
30 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 ...
3
votes
1answer
24 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
53 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
50 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
34 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
90 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
35 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, ...
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
90 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
208 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
104 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
56 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
27 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
937 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
83 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 ...
3
votes
1answer
493 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
142 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
97 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
29 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
34 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
112 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 ...