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.
0
votes
1answer
158 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 ...
8
votes
1answer
166 views
Reprojection - Learning the ins and outs
I would like to expand my knowledge coordinate systems, projections and reprojecting data, with a view of writing a reprojection engine.
Could you provide me with some resources (books, websites, ...
0
votes
1answer
97 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
200 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
134 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 ...
2
votes
1answer
243 views
How to create aux.xml file?
after starting to use MOBAC to create offline background maps I found the aux.xml files very useful as QGIS automatically sets the CRS so this would be very useful for my colleagues with smaller GIS ...
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
445 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
774 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 ...
5
votes
1answer
599 views
MGRS in OpenLayers
I am trying to view the Military Grid Reference System coordinates in Openlayers through the MousePosition control. Is there an easy way to accomplish this just through Javascript? I am looking at the ...
2
votes
2answers
587 views
Convert RT90 into WGS84
Goal:
Gain WGS84 decimal to locate some cities in Google Map.
Problem:
I don't know how to convert the value of the RT90 coordinate system into WGS84 in SQL Server.
1
vote
1answer
163 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
88 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
1answer
388 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 ...
2
votes
0answers
99 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 ...
1
vote
0answers
189 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 ...
3
votes
2answers
155 views
How do you change the prime meridian of a map?
I am working with the Natural Earth world map as a SHP file, but when I try to change the prime meridian (PRIMEM) of the coordinate system
...
4
votes
0answers
195 views
Can GeoTools parse GML CRS definitions?
A kind of branching of this question.
Soon I will need to handle GML Coordinate Reference Sysyem definitions in a Java servlet. Links:
GML OGC reference.
Concrete example.
I know that GeoTools ...
2
votes
1answer
85 views
Is there an arcpy boolean check for whether an EPSG or prj is supported by arcmap?
I'm writing a tool and essentially I found out that arcmap defaults an epsg to 0 if it sees that the projection is not supported against the predefined projections.
0
votes
1answer
3k views
How to convert from UTM Zone 36N Mercator to WGS 84 degrees of lat and long?
I have acquired many coordinates from a points I extracted from polygons. The points are in WGS 84 UTM Zone 36N, and I want to use them on Google Maps. I found out that they use different systems (I ...
2
votes
1answer
265 views
coordinates in dbf file wrong
I am new to ArcGis, so please bare with me :D .
I converted a polygon in an mdx file I have to a shape file, then converted its vertices to points, then used "add X Y feature" and choosed coordinates ...
1
vote
0answers
177 views
Create IPoint with Lat/Long in decimal degrees and Z in feet
I have written an ArcMap v10 AddIn that reads a folder of geotagged JPEG's and creates a new feature class where each point is the geotag information from on of the JPEG's. The issue is:
The GPS ...
4
votes
1answer
272 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 ...
1
vote
1answer
74 views
Which SRS is computational more effective to store continental scale data? (given some conditions)
For a Precision Agriculture application I need to make calculations in UTM projection. The data will be stored in Postgis and is made of soil samples results (point data) and field boundaries of many ...
17
votes
1answer
2k views
Is WGS84 itself a Coordinate Reference System?
I was wondering the difference between WGS84 and EPSG:4326 (see this).
Can then WGS84 on its own be defined as a Coordinate Reference System?
Or is it just a datum so that a Coordinate System must ...
6
votes
1answer
605 views
Difference between Geographic-3D and Geocentric CRS
I'll start with the OGP definitions:
Geographic. A coordinate reference system based on a geodetic datum and using an ellipsoidal (including spherical) model of the Earth. This provides an accurate ...
4
votes
1answer
297 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
771 views
How to get the coordinate system from a PostGIS database?
My question is probably amazinlgy stupid, but I can't find the answer myself.
I would like to extract from a database the latitude and longitude of points. For now, I'm getting x(the_geom) and ...
1
vote
1answer
75 views
Read height data from Meridian 2
I'm having difficulties reading the Gridded height data (OS Meridian 2). I'm loading with OSGB 1936 reference system but have trouble finding the lat/lon data for each point. i.e.I open the attribute ...
0
votes
2answers
587 views
How to convert Grid North & Grid East into latitude and longitude?
We have grid north and grid east data that we have received for address information. How can this be converted into latitude and longitude? I am not sure what format this grid_east and grid_north data ...
17
votes
7answers
513 views
Spatial reference for dummies?
Can anyone recommend a good reference or tutorial that explains the principles of spatial references, projections, and coordinate systems? We are a small team of programmers working with GIS ...
0
votes
1answer
375 views
Coordinates of raster image from .TAB file
I have got a raster image (tif) from a mapping site and an associated .TAB file. I am trying to correctly map it into CAD/3d model - which I know is set up to the correct coordinates.
The .TAB file ...
1
vote
1answer
280 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
2answers
275 views
Saving spatial reference of MapInfo TAB-file to file (like .prj)
I have some MapInfo TAB-file and I'd like to save spatial reference to .prj-file. How it can be done?
0
votes
2answers
264 views
Setting spatial reference for MapInfo tab-file
How can I change spatial reference for tab-file in MapInfo Professional?
1
vote
1answer
187 views
Importing a PostGIS and a Delimited Text layer in QGIS, not overlapping
I'm a beginner in QGIS, and I have a PostGIS database and a CSV file I would like to visualize.
I followed the instructions in this question and the answers, but it doesn't work for me, my two layers ...
0
votes
0answers
31 views
Calculating ECEF X, Y, and Z velocities between 2 points on Earth [duplicate]
Possible Duplicate:
How do I calculate ECEF X,Y,Z velocities for GPS if I have no satellites
This is my third attempt at explaining what I'm trying to do.
If I have two ECEF X, Y, Z ...
0
votes
2answers
62 views
Need Image with Sweref99_1800 projection/coordinate system
I need third party image tiles (probably world imagery) under sweref99_1800 projection and coordinate system (EPSG 3008). I found this link ...
1
vote
2answers
294 views
QGIS layers no longer overlay when Enable 'on the fly' CRS transformation is on
My QGIS project has two layers - one retrieved from GADM (administrative boundaries of Guinea Bissau) and another one of the villages collected in the field using GPS Decimal Degrees - D.ddddd.
If I ...
1
vote
1answer
223 views
What does 1:10m mean related to map resolution?
On Natural Earth they offer maps at various resolutions. What does 1:10,000,000 mean? Does it translate to the number of points per square meter or mile?
5
votes
2answers
1k views
How is EPSG:4326 data 'projected' in a 2D map?
I like to think I'm relatively well-versed in datums, projections, and coordinate reference systems, so if this is a stupid question I will suffer eternal shame.
OpenStreetMap data is stored in WGS84 ...
0
votes
1answer
213 views
Generate a random 100x100 m bounding box in any projection in pure Python?
I'm given:
Extend of WMS Layer
SRS
Now I want to, in standard 2.6 Python (no OGR or C lib dependencies), to generate a 100x100m random bounding box within that extent (assuming it is more than ...
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 ...
0
votes
0answers
237 views
Geoserver WMS cascading: How to choose remote CRS? [closed]
I'm cascading a remote WMS from Geoserver in order to have all layers in one place (and to exploit caching). (see the manual)
The remote layers (on this geoportal) are provided in multiple SRs (e.g. ...
1
vote
1answer
226 views
What datum (reference ellipsoid) does Nasa Worldwind use?
What datum (reference ellipsoid) does Nasa Worldwind use?
I can't seem to find where Nasa Worldwind tells explicitly what datum they use. I need some sort of valid link.
3
votes
1answer
281 views
Using QGis for an imaginary plane world
I created an own map for my p&p rpg group and now I want to transfer it into QGis.
That's easy to make, but I'd like to have an own CRS for that map but don't know
how to use the right proj.4 ...
2
votes
1answer
276 views
How to translate coordinates on the earth
I am trying to translate coordinates. I have a set of coordinates for city A which I need to map to city B, given a point P1 in city A maps to P2 in city B. How do I do this? This problem would be ...
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 ...
4
votes
3answers
627 views
How can I find out how to convert this point to lat lon?
I have received a shapefile with measurement points to be analyzed, but no matter how I try, I can't find how to convert to lat lon. I suppose it would be good to know the projection but when I look ...
4
votes
1answer
235 views
Projecting gps data to get length of resulting line shape in ArcMap 10.0
I have gps data in WGS84 geographic coordinates. I will use the gps data to build a line shape in ArcMap 10.0. The data falls in UTM 15N.
To get most accurate length of line, should I project the ...
