A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.
1
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1answer
172 views
ogr: how to use epsg database for RD New projection?
I'm trying to assign this EPSG projection to my newly created shapefiles using ogr.
The OGR Projections Tutorial says:
...any geographic coordinate system in the EPSG database can be set by it's ...
3
votes
4answers
193 views
How to measure without coordinates?
My current Project is to "map" a turntable in qgis. I know, very unlikely but that's what my teacher wants.
My teacher also wants me to measure something in this project (Very specific, isn't it?). ...
15
votes
5answers
2k views
How do you best deal with data that spreads across UTM Zones?
I have data that spreads across two UTM Zones GDA/MGA94 UTM Zone 55 and 56. I have layers such as a cadastre, roads, pipelines etc where I want to store measurements like lengths and areas in metres ...
1
vote
2answers
731 views
shape file coordinate system
I added a shape file of Iran to Qgis.
'Tehran' has 35.6833° N, 51.4167° E coordiantes, however Qgis shows Tehran with 4772860,31296767.
How i can view coordinates of a city or location in latitude ...
2
votes
2answers
410 views
How to use the coordinate system in arcgis 10?
I have a favor to ask. I have a few layers. The layers have been made by a different company. So how do I combine them all together so that they have the same coordinate systems? If there are any ...
4
votes
1answer
307 views
How to define a CRS using a projection rotated about a given point
I have a data set that uses a common projection, but has its own false easting and northing, and is rotated 315 degrees. I need to be able to work in this CRS and easily translate from one CRS to ...
3
votes
1answer
262 views
Different coordinate system for map project and scalebar?
Is it possible to specify a coordinate reference system (CRS) for the scalebar that is different to the project CRS?
Example: my project CRS uses geographic coordinates (lat/long), the reason being ...
1
vote
3answers
677 views
Local Coordinate to Geocentric
The ultimate question, I need a transformation matrix to take a point in local space representing a roughly 500m x 500m place in New Mexico centered at -108.619987456 long 36.234600064 lat. The final ...
2
votes
1answer
513 views
Why is my .prj file not being read by QGIS?
First off, I am new to GIS.
I am using qgis (1.8.0), and have been given a shapefile containing .shp, .prj, .shx, .dbf, however qgis will not load the .prj file stating an invalid data source.
...
2
votes
3answers
958 views
Problem with spatial reference system / shapefile projection
I am new to using QGIS and having some problems getting some shapefiles to project correctly. I am using publicly available shapefiles for New York City municipal boundaries found here:
...
0
votes
1answer
106 views
How do I reproject a arbitrary coordinate system grid to OSGB
I have a polygon grid of a certain shape that has some data associated with it. Unfortunately its not properly projected, being in what seems to be an arbitrary scale and coordinate system (it was ...
0
votes
4answers
828 views
How to plot a point on a static Google map [png]?
map&markers=color:blue%7Clabel:S%7C40.702147,-74.015794&markers=color:green%7Clabel:G%7C40.711614,-74.012318&markers=color:red%7Ccolor:red%7Clabel:C%7C40.718217,-73.998284&sensor=false
...
2
votes
2answers
165 views
Ordnance Survey osgb:BNG spatial reference system not recognized by PostGIS
I'm trying to load an Ordnance Survey GML file into PostGIS using the ST_GeomFromGML function. The problem is that the spatial reference system that is used in the file, osgb:BNG, is not recognized by ...
2
votes
0answers
231 views
PostGIS: ST_Transform function conversion problem
I'm inserting map data from a GML file with srid EPSG:27700 into a PostGIS database table with srid EPSG:4326. I'm using the ST_Transform function as in this snippet:
...
1
vote
0answers
23 views
Translate geographical coordinate [duplicate]
Possible Duplicate:
Calculating Lat/Lng X miles from point
I would like to know how could I translate a geographical coordinate to an specific distance. So for example let's suppose I'm ...
0
votes
0answers
15 views
QGIS 2 shape 2 different projections [duplicate]
Possible Duplicate:
Why don't different layers overlap in Quantum GIS?
I have a problem with 2 shape coming from different sources.
They represents differents items of Italy (roads and ...
1
vote
1answer
679 views
GeoToolKit conversion from lat/long to UTM
What is the proper way to convert lat/longs to a UTM coordinate system using the Java geotoolkit API? I have not worked with GIS software before, so maybe what I am trying to do is not directly ...
5
votes
2answers
288 views
What is the origin of the Degrees, Decimal Minutes format?
In my experience, for most non-GIS folks, the most commonly used and understood coordinate system is good old Latitude and Longitude, displayed as degrees, minutes, and seconds (DDMMSS.ss). In GIS, ...
1
vote
0answers
105 views
Natural Earth: How to get the position of each country?
I've just split the 1:10m Natural Earth countries into individual JSON files which I plan to render and partially stitch back together using RaphaelJS. The 1:10m map is very big (10mb or so) so ...
0
votes
1answer
128 views
Spherical Mercator to Cylinder mercator?
Hello I want to create an overlay for google maps.
As far as I know google maps using Spherical Mercator, so the system where I read the maps use Mercator but is not specified which (spherical or ...
0
votes
0answers
102 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). ...
3
votes
0answers
52 views
How can I specify a spatial reference system which has a north pole different than the standard north pole?
I have a geographic spatial reference system (i.e., latitude and longitude) which has a north pole that is not the usual north pole: it's the magnetic north pole at approximately 70.30 degrees north, ...
7
votes
1answer
588 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, ...
8
votes
2answers
687 views
How can I convert geomagnetic coordinates to geographic coordinates without doing the math myself?
I have some data which are in geomagnetic coordinates; that is, they are latitude and longitude, but in reference to the magnetic north pole in Canada rather than the geographic north pole. As you ...
2
votes
3answers
120 views
coordinate definitions from nyc.gov open data SpatialLocation field
The NYC Open Data website has a dataset of street events. The last column is called SpatialLocation, and is defined as a text field. An example is below. It is clearly two points on a physical map. ...
2
votes
0answers
144 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 ...
4
votes
3answers
87 views
Please help me identify this CRS. How could I identify this myself in the future?
I'm trying to georeference this map, but I don't recognise the CRS. It is for a region of Tanzania. Here is the image on imgur in case Stack Exchange compresses the image.
How would I go about ...
1
vote
1answer
102 views
How to determine Earth co-ordinates?
I just read about latitudes and longitudes. I read latitudes are imaginary lines that run around the earth and longitudes are lines that run around from top to bottom.
Using this system:
1. ...
1
vote
0answers
319 views
Importing GPS coordinates correctly
I am importing a gsx set of waypoints with lat/lon taken in degrees, minutes, and thousandths of a minute. When they are added to my project, the waypoints are not showing up correctly - the ...
5
votes
2answers
819 views
PHP MGRS Conversion Formula/Library
Currently, the formula I'm using to convert MGRS to Lat/Long and vice versa is giving me slightly different results than most other conversion utilities. It's usually between 10 to 30 feet off. This ...
0
votes
1answer
149 views
How to find embedded Coordinate Reference system in a Layer
I want to find CRS in an added shape file.
Ex. In Arc GIS if we go to Layer Properties and Source we can find embedded CRS to a layer.
How to find in QGIS, embedded CRS ia a layer/ Shape file???
I ...
2
votes
4answers
256 views
Is there a way to erase GeoTIFF header?
I've got some GeoTIFF files that have wrong bounding box extent and wrong CRS associated to.
Fortunately I know the right CRS, but even associating it to the files (I've tried both with QGIS and ...
12
votes
5answers
10k views
Get list of coordinates for points in a layer?
I've got a layer in QGIS that is comprised of points. Its attribute table doesn't have the corresponding x y coordinates for each point. Is there a way for me to extract a list of coordinates for ...
5
votes
2answers
611 views
What is the SRID of census.gov shapfiles?
I downloaded the county files from:
http://www.census.gov/cgi-bin/geo/shapefiles2011/main
I cannot figure out what SRID to use with them. When I am trying to generate a class file from ./manage.py ...
4
votes
2answers
287 views
How to represent an imaginary flat world in QGIS without using a round-world CRS
Like one or two other users, I'm interested in using QGIS to map an imaginary flat world. A previous answer suggested simply refraining from defining a CRS for such a world, but I cannot seem to make ...
1
vote
1answer
285 views
How does ESRI ArcGIS 10 recognize a WMS CRS?
I'm working on a WMS service with Mars data. Currently the GetCapabilities shows <SRS>EPSG:4326</SRS>. I assume ESRI ArcGIS 10 reads this and therefore the WMS has GCS_WGS_1984 as a ...
0
votes
1answer
163 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 ...
0
votes
1answer
102 views
Check multiple feature classes have same spatial reference
As the title says I've several feature classes. I want to check whether they have same spatial reference using arcpy
2
votes
2answers
210 views
How do I set custom spatial reference/coordinate sys to my shapefile
I have a python code which converts JSON text file to a shapefile. I have to set coordinate system to this shapefile created. I do not want to access the .prj file from my computer as this code will ...
1
vote
0answers
139 views
how to correct the coordinate of points [closed]
I have some a layer which contains some points. The coordinate of the points should be GPS points. However, the coordinate of these points are not correct. What should I do?
I am using QGIS. If I ...
6
votes
3answers
1k views
Geodetic Coordinates And Latitude, Longitude
Would it right to say that geodetic coordinates (phi & lambda) are the same as latitude & longitude?
1
vote
1answer
506 views
Generating Map Tiles for MGRS Grid Graticule
I'm possibly a bit out of my league here, but ready to get my hands dirty. I want to generate map tiles for a MGRS grid graticule similar to http://tiles.mapbox.com/mapbox/map/afghanistan-mgrs.
I ...
1
vote
1answer
870 views
distanceTo is giving wrong result in OpenLayers?
Hi i am using distanceTo from OpenLayers to calculate the distance between two locations
these are map details
Geographic = new OpenLayers.Projection("EPSG:4326");
Mercator = new ...
1
vote
1answer
286 views
Looking for help identifying projections and reprojecting
Hi there at the new forum,
I'm still struggling with projections in qgis. The "Vogelschutzgebiete" reprojection worked. But these ones seem to be tougher:
...
1
vote
1answer
171 views
Coordinate systems
Does the Coordinate system of a data frame in ArcMap have to match the coordinate system of at least one of the layers in the table of contents?
I have found that if defined it will take on the ...
2
votes
0answers
89 views
When using OpenLayers plugins maps, can I have Longitude/Lattitude labelled on my grid when using the Map composer in QGIS?
Using OpenLayers plugins maps, can I have Longitude/Latitude labelled on my grid when using the Map composer in QGIS?
2
votes
0answers
102 views
Changing CRS crashes QGIS every time
When I open QGIS, and use the tools, setting -> project properties, QGIS will crash.
When I also use the setting -> option -> CRS , Select new CRS also causes a crash.
It looks like couldn't use the ...
2
votes
1answer
417 views
How to move SHP to gdb with ArcView license?
What I need to do is move all the files into an mxd to a newly created gdb, chechking prj, and update mxd reference.
I have ArcGIS 10 SP4, license ArcView
I studied a bit of Python and get familiar ...
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 ...
1
vote
0answers
199 views
ogr2ogr failed to reproject shapefile error exceeds limits
I cannot get correct transformation from WGS84 to the Hungarian EOV EPSG:23700 (Hungarian Datum 72) using ogr2ogr.
I am using ogr2ogr from the fwtools shell. I have a shapefile in GCS WGS84 (epsg ...
