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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(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 ...
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0answers
16 views

NTv2 inverse transformation calculation process

NTv2 grid files are used to calculation latitude and longitude offsets for a datum transformation. In the forward calculation, bilinear interpolation is performed by using the four closest points. ...
3
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1answer
21 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
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3answers
107 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 ...
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0answers
14 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 ...
3
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1answer
23 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 ...
2
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1answer
49 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 ...
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0answers
41 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 ...
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0answers
37 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 ...
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1answer
26 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 ...
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1answer
24 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 ...
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1answer
14 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 ...
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1answer
32 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 ...
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1answer
30 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 ...
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3answers
24 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. ...
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0answers
27 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. ...
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0answers
36 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 : ...
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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"
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0answers
54 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 ...
0
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1answer
40 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. ...
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1answer
34 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 ...
2
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1answer
41 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 ...
2
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1answer
136 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. ...
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0answers
21 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 ...
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0answers
57 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 ...
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0answers
82 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 ...
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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?
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1answer
44 views

Georeferencing points to an aerial image

I have a file containing a large number of points that were digitized from scanned plans in CAD. The points represent pit lids at an industrial facility. When the point file is laid over the aerial ...
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0answers
142 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 ...
2
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0answers
40 views

How can I move a polygon to a different place on the globe, while maintaining its true geographical size? (QGIS)

I'm trying to do something similar to the Greenland vs Africa comparison -- superimpose one country over another, showing how their true sizes compare (the example on the right). Thought this would ...
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1answer
45 views

Converting UTM55 to WGS84 in ArcMap? [closed]

I've got a raster in UTM55 over Australia and I would like to convert it to WGS84. Any idea how to do it ? The problem starts when ArcMap recognize it as 'Geo-Reference' only and not as UTM55, so I ...
2
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0answers
59 views

Regridding vector values

I'm trying to regrid and interpolate vector values from WAM model output. I got WAM model netCDF output in rotated grid, I need to interpolate it to another grid which is some variant of LAEA ...
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0answers
41 views

Visio to CAD to GIS, How to geo-reference? [closed]

I have CAD file converted from a MS Visio diagram, representing power line cables. Data source has no spatial reference. I converted into shapefile and now I am trying to georeference the vector ...
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1answer
34 views

SRTM 1arcsec transformation in ArcMap?

I downloaded SRTM data from http://earthexplorer.usgs.gov/ (tile n49 e019 - North Slovakia and Poland). I need to project data into another coordinate system and projection, but I still have an 999999 ...
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0answers
35 views

How do I translate gps sports data into a representative plane

I'm hoping to use qgis and postgis for a project but I'm unsure of, how to not only frame the question but accomplish the task. If I have gps data from 1 runner on an oval track but who has run on ...
1
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1answer
40 views

Performing transformation with pyproj?

This seems like it should be straight forward, but I'm struggling to get the correct transformation from my state plane to lat long. My code is as follows # projection from ...
1
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1answer
31 views

Get pixel geo info according projection and map extent

I would like to know if it is possible to calculate the geographic coordinates (lat, lon) for a pixel specified by its x/y (top-left) cartesian coordinates in a map image/raster? The datum and ...
3
votes
1answer
59 views

How to transform unknown coordinates?

I have two lists of coordinates in lat/long format which are showing the same points but in different coordinate systems. I need to find the corresponding points in two datasets using distance but ...
0
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1answer
78 views

transform geometry PostGIS column with unknown geometry type

I run PostgreSQL 9.1 and PostGIS 2.0. I have a table that contains one geometry column. But that column contains point, polygons lines, etc. So I set it like so, ALTER TABLE jake ADD COLUMN ...
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1answer
78 views

netCDF transformation

I have netCDF files with some datasets with data and two datasets containing lons and lats. I would like to open data layers in QGis in coordinates that are writen in netCDF's lon/lat datasets. How ...
2
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1answer
127 views

How do I transform a point using NetTopologySuite?

I'm exploring how we can use NetTopologySuite to address a geoprocessing task. based on some code sample I found, I was able to piece together a sample application that reads a shapefile and checks if ...
5
votes
2answers
196 views

Coordinate/projection system issue in ArcGis 10.3

I am new in this community and I am also a new user of ArcMap. I am facing a problem, my shapefiles are in a GCS WGS 1984 and I have to add a new shape file that is in a projected coordinate system ...
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0answers
34 views

Sinusoidal Projection and ArcInfo Sphere Datum Woes

I am using published forest loss data (found here: http://glad.geog.umd.edu/indonesia/data2014/index.html) that uses the ArcInfo Sphere datum with a sinusoidal projection. I am seeking to transform a ...
0
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1answer
179 views

PyQGIS: how to transform single QgsGeometry object from one CRS to the other?

I have a polyline layer with roads in WGS84 that covers several UTM zones. For every road I need to place a set of points at different distances (in metres). To do so I want to reproject each road to ...
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1answer
42 views

Batch reproject shapefiles in subdirectories

I have a catalog tree and in every folder I have a number of shapefiles, images and mxd files. The shapefiles are all in Greek Grid projection system (EPSG: 2100). What I want to do is to batch ...
5
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2answers
196 views

How to Convert Map Coordinates to Layout Coordinates in a rotated Dataframe?

I am trying to convert Map X and Y coordinates to corresponding Layout coordinates in a rotated dataframe. The code found in this post works fine, but only for unrotated dataframes. I've also found ...
0
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1answer
39 views

Get geotiff Transform from point correspondences

I am trying to find a way to get the Geo Transformation (NW corner position, pixel size and rotation) for a given tiff image. I have a tiff which I know is using some coordinate reference system (an ...
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0answers
54 views

Creating (manually transforming) a DXF in WGS84 lon/lat coordinates. In which coordinates do I have to define blocks?

I've got a DXF file that represent a map with lines, texts, and some symbols (blocks in DXF). I need to transform coordinates from a local cartesian system to WGS84 lon/lat coordinates, maintaining ...
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0answers
77 views

Converting object's 2D Coordinates into World coordinates (Lat,Long)

I'm using Viz Artist to do this. Basically, I am trying to move an object along surface of the Globe. The object has its world position (Lat, long) plugin whereby it will appear as it is on the ...
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0answers
284 views

Projection Transformation from ETRS89 LAEA to WGS1984

I am having difficulties to transform a Shapefile in ArcGIS 10 from ETRS 1989 LAEA to WGS 1984 N33. I have 2 files: a) in WGS1984 N33, with a grid of 10x10km, b) in ETRS 1989 LAEA, with small ...