Tagged Questions
0
votes
2answers
44 views
Thiessen Polygons and Coordinate Projections
I am trying to perform a Thiessen Polygons analysis in ArcGIS 10.
My DEM is in GGRS_1987 and the point set I downloaded from Google Earth is in WGS_1984. The points display correctly but when I run ...
1
vote
1answer
52 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 ...
1
vote
0answers
23 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 ...
0
votes
0answers
12 views
Units of Geometry & Geography data type [duplicate]
When you store data using the Geography data type (like in PostGIS), is it always in lon/lat in degree decimals?
For the Geometry data type, what are the units used in the coordinate pairs? Can it ...
2
votes
1answer
58 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 ...
3
votes
1answer
161 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 ...
0
votes
0answers
52 views
What's the difference between CRS 4326 , CRS 4978 and CRS 4979?
They 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?
Why are we using "geographic ...
8
votes
1answer
255 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 ...
2
votes
2answers
105 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 ...
2
votes
1answer
198 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 ...
0
votes
0answers
100 views
Project custom metric coordinates on the EPSG map with GeoServer [closed]
I have an application that displays different items on the custom map. The map has a coordinate system which is basically (X,Y) coordinates in centimeters where top-left corner has coordinates(0,0). ...
2
votes
0answers
140 views
How to decode Magellan URL coordinates to lat/lon
Magellan uses this URL to designate a coordinate in New York:
mgn:///address/?coord=merwFvlqbM,name=Viva%20Herbals%20Pizzeria,number=179,street=2nd%20Avenue,city=New%20York,country=US
How can I ...
7
votes
1answer
538 views
Computational most efficient way to convert Cartesian to Geodetic Coordinates
As far as I understand the literature there are several ways to convert a set of geoecentric cartesian coordinates to geodetic coordinates
Bowring, 1976
Borkowski, 1989
Lin & Wang, 1995
Toms, ...
0
votes
1answer
160 views
coordinate projection
I'v got a detail map for an event as PDF an made an openlayers slippy map with Maptiler. I now need to place markers at the position of gps/gsm-trackers, which store their coordinate on a server.
The ...
4
votes
1answer
274 views
EPSG operations and operation methods
Querying through the EPSG database, I can see the tables epsg_coordoperation where transforms and conversions between different CRS are stored, and epsg_coordoperationmethod which stores the ...
0
votes
2answers
267 views
Setting spatial reference for MapInfo tab-file
How can I change spatial reference for tab-file in MapInfo Professional?
0
votes
1answer
1k views
Adding EPSG:3857 / 900913 to Oracle's mdsys.cs_srs
I am working with an Oracle Standard database at version 11.2.0.1.0. I also have access to XE version 11.2.0.2.0.
The later version has both SRIDs 900913 (Google Mercator) and 3857 (official Web ...
2
votes
1answer
1k views
Projecting shapefile with transformation using OGR in python
I want to change coordinate system of a shapefile from British National Grid to WGS84 (in order to be able to convert it to KML later on). To get the best results of projecting I would like to use ...
1
vote
1answer
169 views
Dynamic defining of transformation type for ISpatialReferenceFactory.CreateGeoTransformation call
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
2answers
716 views
Online service to transform coordinates from WGS84 to NZTM and NZMG
Has anyone come across a free web service / REST API to transform coordinates?
I'm particularly interested in transforming from WGS84 to: New Zealand Geodetic Datum 2000 (NZGD2000 / NZTM) and New ...
8
votes
3answers
4k views
Coordinate System Transformation in ArcMap
For the Data Frame Properties on a map in ArcMap, what is the difference between selecting a new coordinate system and using a Transformation?
4
votes
1answer
2k 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.
