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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2answers
23 views

QGIS On the fly reprojection issue

i'm having an issue with QGIS 2.14.3 (Windows 10). I've two layers: PostGIS table (EPSG:23030) Shapefile (EPSG:25830) I setup on the fly transformation (23030) in QGIS, just for check, but both ...
0
votes
0answers
22 views

Reading and writing block windows with Rasterio? [on hold]

I'm trying to go about reading large rasters by the block windows in Rasterio. Everything works and I can iterate and output the flat file for my coworkers, but I can't for the life of me figure out ...
1
vote
0answers
10 views

How much error is should occur when using WGS84 to ECEF coordinates?

I am creating geoinformatics software and have found the appropriate formulas for converting Wgs84 to ECEF. I've checked my outputs against various sources and they seem to be correct. However the ...
1
vote
3answers
6k views

Convert geometry to latitude-longitude using PostGIS ST_Transform

My table has a geometric field, in EPSG:3857, of type point. I need the latitude and longitude, in EPSG: 4326, of each point. Could someone give me a valid example of how to use ST_Transform().
0
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0answers
13 views

Transform projection with SharpMap

I have SharpMap loading a shapefile and displaying the rendered image to a PictureBox. If I open the shapefile in QGis I can see the SRC: +proj=merc +lon_0=100 +lat_ts=-41 +x_0=0 +y_0=0 ...
1
vote
1answer
27 views

rgdal / ggmap : rotate map data and clip map

I'm trying to plot a map of Toronto with ward boundaries and geocoded data on events over years. But the layout is such that I end up with mostly wasted space in the map. To increase resolution for ...
4
votes
2answers
204 views

Lat/Long -> UK Easting/Northing?

I have a fairly accurate formula (implemented in C#), which allows me to convert UK Eastings/Northings to WGS84 Latitudes and Longitudes. Despite extensive Google searches, I could not find a formula ...
0
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0answers
23 views

Algorithm for converting from projected coordinate system to geographic one using Helmert transformation

I have a data in projected coordinates system and I need to convert them to WGS84. I know the parameters of position vector transformation and I know the projection details of my projected coordinate ...
1
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1answer
258 views

SharpMap Coordinate transformation Problem

I want to transform my layers from SRID 31463 (Gauß Krüger) to Webmercator. Since SharpMap does only know webmercator and WGS84 i tried to create the Coordinate System 31463 by WKT and applied it on ...
5
votes
2answers
89 views

Transform local polar coordinates to UTM

I have some field points disposed like the diagram below: In this diagram, I know: 1) Point A UTM coordinates 2) Distance between A and B 3) Distance between B and C 4) AB azimuth 5) BC ...
1
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0answers
56 views

projected coordinate system and transformation

I'm a beginner with GIS and I'm currently working on ArcGIS 10.3. I have two distinct shapfiles : one within the projected coordinate system "NTF_Paris_Lambert_Sud_France" and the second one within ...
4
votes
1answer
45 views

Converting from one Transverse Mercator based system to another produces inconsistencies

As a civil engineer, the one semester of survey training we had leaves my knowledge quite lacking in the field of coordinate systems. We're working on a project based in Gabon and we get information ...
0
votes
1answer
31 views

Can gdalwarp reproject from ESPG:4326 (WGS84) to UTM?

I've a GeoTIFF image in ESPG:4326 (WGS84) and when I try with gdalwarp to reproject to UTM, it has problem gdalwarp -s_srs "EPSG:4326" -t_srs '+proj=utm +zone=33 +datum=WGS84 +units=m +no_defs' -of ...
0
votes
1answer
263 views

Rotate Feature or Geometry OpenLayers 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

use of gdaltransform in C# code

I have a problem to use correctly gdaltransform in a C# project to transform a set of coordinates from a crs to another. If first try in console command and this line is working good my inpufile ...
1
vote
1answer
62 views

(Arcpy) read values from a txt file and convert the data into a shapefile

I´m a beginner at python programming and wanted to start with a litte and hopefully simple project. I tried to read float values out of a textfile and write them into a shapefile. The program is ...
0
votes
1answer
18 views

GeoServer WMS transformation causing problems!

I am displaying the population density as wms layer with geoserver 2.8 in tomcat8. As you can see in the screenshot, there are some strange borders where are no values in the tiff file. Can anyone ...
3
votes
1answer
32 views

VDatum helmert transform parameters

I'm trying to use NOAA's VDatum to verify the NAVD88 -> WGS84 datum conversion in a c++ datum conversion library that I've written. The answers didn't agree, so I attempted to check a simple ITRF2008 ...
3
votes
1answer
27 views

Default transformation for a EPSG CRS

Is there any way to know which transformation, from available, is the default transformation for a CRS in the EPSG database? For example, EPSG:4230 has more than 30 transformation available and ...
5
votes
3answers
113 views

Are perpendicular lines still perpendicular after converting from UTM zone 15 to 16 (or between two neighboring zones)?

I want to convert a square polygon that is close to the edge of UTM zones 15N and 16N. The polygon's coordinates are in UTM 16N, but it is spatially positioned in the UTM15 area. My question is that ...
0
votes
0answers
21 views

GCS_Clarke_1880 transformation to GCS_WGS_1984 in ArcGIS 10.3.1

ArcGIS 10.3.1 has no transformation for GCS_Clarke_1880 to GCS_WGS_1984. Why is this the case, what have I missed? Do we have to write a custom transformation? There are a heap of Clarke ...
0
votes
1answer
163 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 ...
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3answers
2k 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
1answer
58 views

How to correct ArcMap re-projection

In ArcMap, I add a layer from ArcGIS web server projected in "Bessel 1841 Transverse Mercator". Then I add new layer as a base map from ArcGIS online web server. This is the result: Shift is ...
1
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3answers
142 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
1answer
2k 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 ...
2
votes
0answers
40 views

UTM to Latitude/Longitude

I've coded up Karney's transformations from UTM to latitude/longitude coordinates. My work however requires me to know if this conversion is in geocentric or geodetic latitude. I have not been able to ...
0
votes
1answer
30 views

Fiona and Pyproj incorrect transformation (feet to meter)

I am trying to reproject a shapefile from EPSG:2229 (NAD83 / California zone 5 (ftUS)) to EPSG:2163 (US National Atlas Equal Area (meters)). Below is the code that does this transformation for a ...
0
votes
1answer
89 views

LAStools (3D Analyst) scale factor application

I'm trying to use the las2las (transform) module from the LASTools toolset to apply a scale factor to an LAS dataset. The problem is that the client wants us to apply the scale factor from a known XY ...
0
votes
3answers
31 views

Transform/Align Census 2000 Blocks to Census 2010 Blocks

I would like to align census tabulation blocks from the 2000 and 2010 censuses. I have the relationship file, so I know which blocks are suppose to the same and which were split or consolidated. ...
1
vote
1answer
35 views

convert REGCAN95 coordinates to OpenStreetMap coordinates (WGS84-Form in lat/long)

I have some coordinates in datum REGCAN95, and I want to know how to convert them to something usable in OpenStreetMap. I have found that REGCAN95 uses the EPSG codes as follows: 4082 REGCAN95 for ...
4
votes
1answer
112 views

Point Coordinates Conversion with unknown system

I've been using QGis for few weeks now. Although this site always came very helpful, I can't find solution to my recent problem: I have few points, and know their coordinates in "WGS-84" and "ISN-93" ...
1
vote
1answer
294 views

Dynamic defining of transformation type for ISpatialReferenceFactory.CreateGeoTransformation call [duplicate]

Suppose given a point (IPoint) in some coordinate system. Required to transform it to another coordinate system. If both of coordinate systems are predefined, we can use IGeometry2.ProjectEx with ...
1
vote
1answer
36 views

Transform Natural Earth data to 27700

I'd like to know how (if possible) to transform the shapefiles I've downloaded from the natural earth datasets which are in EPSG:4326 to BNG EPSG:27700. So far I've loaded the shapefiles I need into ...
0
votes
0answers
36 views

Finding GeoTIFF GeoTransform when camera position is known

In short, I want to create a GeoTIFF from aerial images taken with a camera whose position (x, y, z, roll, pitch, yaw) and parameters (focal length etc.) are known. No ground control points are known. ...
2
votes
0answers
55 views

Determining EPSG code for coordinate transformation using ArcPy? [closed]

I am trying to write a Python script which will identify the EPSG code for the coordinate transformation. I am familiar with the dataFrame.geographicTransformations function, however this returns a ...
2
votes
1answer
32 views

Transformation from EPSG 2178 to EPSG 4326 gml.file?

How can I transform .gml file from EPSG 2178 to EPSG 4326? I used the following without success: gdaltransform -s_srs EPSG:2178 -t_srs EPSG:4326 "file1.gml"
0
votes
0answers
41 views

Problem with adding GeoJSON to OpenLayers 3

I transformed (.geojson file)from EPSG 2180 to 4326 using ogr2ogr -f "GML" -lco GEOMETRY=AS_XY -t_srs EPSG:4326 test.geojson file.geojson I would like to add to map, but I received this error : ...
0
votes
0answers
66 views

GeoServer SLD Filter rule before PointStacker transformation

I'm trying to apply a filter rule in an SLD, before applying the GeoServer PointStacker transformation (which groups points that are too close to distinguish their icons). This transformation is ...
0
votes
1answer
48 views

Failed to export vector file from OGR?

I use to transform data points from UTM (WGS84) to WGS84 EPSG:4326. Basically from UTM to Geographic coordinate system both in (WGS84). I tried to do it again but an error message appears. ...
2
votes
1answer
167 views

Unable to transform from EPSG:3857 to UTM in Geotools

I'm using Geotools to perform some transformations between coordinate reference systems. I created a proof of concept taking data from Google Earth, which uses ESPG:4326, and converting it to UTM. ...
1
vote
1answer
41 views

Error distance for coordinate transformation (to WGS84)

I have a dataset with mostly EPSG:31255 and wanted to convert it to WGS84. I now had to realize that the results are up to 100m off when I plot them on a map or just enter the resulting lat lon in ...
0
votes
1answer
56 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: ...
2
votes
1answer
45 views

Arcobjects Assign projection transformation to layer file in VB.net

I want to be able to transform a layer from WGS1984 to OSGB1936. I created a tool that extracts layers from several folders on our company network folders, using check boxes that user clicks. One of ...
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0answers
22 views

Converting Grid to Geographic?

My project specifications are as below: utilise geodetic and shift parameters between WGS84 and specified datum (ED50), local projection (UTM 31N, CM 3 East) and transformation (EPSG1613) for all ...
1
vote
1answer
421 views

Problem with Converting XY Coordinates to LatLon

Here is the function that I use to convert from pixel x,y to lat,lon coordinate: public static Coordinate imageToWorld(Dataset gds, int x, int y) { double[] adfGeoTransform = new ...
3
votes
0answers
89 views

Overlaying WMS in custom coordinate system with other layers in openlayers 3

I have a raster in a custom coordinate system (I added the coordinate system definition to the geoserver EPSG file so that I could choose it as the native projection. Now I would like to add it to a ...
1
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0answers
147 views

Transforming zonal and meridional velocity from regular lat lon to rotated lat lon?

Like in Transforming regular lat/lon to rotated lat/lon? that was asked before, I am working with climate data and I need to transform zonal and meridional velocities (u and v) from regular lat lon ...
0
votes
0answers
15 views

White gaps when transformation world map raster from EPSG 4326 to EPSG 102019 in QGIS? [duplicate]

I am new user, why is white gap occur when transforming the world map (raster from natural earth) EPSG 4326 to EPSG 102019?
1
vote
3answers
2k views

How to convert data in NAD83 (NSRS 2007) to NAD83 (CORS 96)?

I'm quite a ways outside my box on this one, but I would ceratinly appreciate any perspectives on this issue. I have some control points from NGS that are in NAD83 (NSRS 2007) that I would like to ...