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
374 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 ...
7
votes
3answers
528 views
Longitudinal Issues with NetCDF data
I am seeking advice on working with world data sets where the GCS has a positive range (0 degrees to 360 degrees). The data I am working with are NetCDF oceanographic data and have positive coordinate ...
1
vote
2answers
274 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 ...
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.
0
votes
2answers
61 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 ...
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 ...
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?
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 ...
3
votes
5answers
667 views
For a ESRI Geodatabase Feature Class, which table holds the spatial reference?
For a shapefile, the spatial reference / coordinate system information is held in the .prj file. I would like to know which file or table in a geodatabase holds the equivalent information for a ...
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 ...
4
votes
3answers
468 views
How do I specify a CRS for a fictional game map in QGIS?
I am about to start playing a steampunk RPG game called The Iron Realm, which uses a fictional world map. I have recently started using QGIS v1.7 and have no real experience with GIS sysstems. I have ...
2
votes
1answer
275 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 ...
11
votes
7answers
305 views
Public reprojection services
Are there any free public services where I can send one point in a coordsystem and it returns the point reprojected in a specified coordinate system?
I will not be doing many requests, for now it is ...
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
625 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 ...
7
votes
2answers
2k views
Measuring distance in spherical Mercator vs zoned UTM
I've got points in WGS84 lat/long and I'd like to measure "small" (less than say 5km) distances between them.
I can use the haversine formula from http://www.movable-type.co.uk/scripts/latlong.html ...
2
votes
1answer
86 views
Does QGIS support MT83F
Does QGIS support NAD83 Montana State Plane Zone, US Foot?
I have vector data in a CSV file that I would like to display, but the coordinate system is MT83F. I don't see a matching CRS. Is there a ...
-1
votes
2answers
793 views
Projecting data from WGS84 to NAD27 UTM BLM Foot ArcMap
When I use the NAD27 BLM 15N prj from the projected>>UTM>>north america>> in ArcMap 10.0 and go from WGS84 to that..using the NAD_27_To_WGS_84_1 transformation..my resulting shapefile doesn't line up ...
8
votes
1answer
965 views
How to compute the bounding box of multiple layers in lat/long?
I am writing an application to performance test all kinds of map services, primarily AGS 9.x, AGS 10, and WMS 1.x.
Part of the application involves generating random bounding boxes for individual ...
1
vote
1answer
1k views
Changing the coordinate system of a qgis layer to the projection of Google Earth
I want to know how to change coordinate value of a vector layer (13293061,-572595) to 119.413,-5.13677 (vector data & Google Earth do not match). If I output my data using Google Earth as ...
3
votes
1answer
875 views
MS SQL Server's STDistance output differs from Google Earth/Maps straight line distance
I am testing SQL Server STDistance function in the following way:
DECLARE @g geography;
DECLARE @h geography;
SET @g = geography::STGeomFromText('POINT(53.553813 9.99158)', 4326);
SET @h = ...
4
votes
2answers
3k views
Using ArcMap, how may I convert a shapefile to use decimal degrees?
I have a shapefile that currently uses meters as the measure for its coordinate system, but the map framework I wish to use expects decimal degrees. I'd like to reproject my shapefile to use decimal ...
1
vote
2answers
871 views
ogr2ogr srs options: where is the well known definition determined?
In the ogr2ogr documentation it says that when using -a_srs srs_def:
Srs_def can be a full WKT definition (hard to escape properly), or a well known definition (ie. EPSG:4326) or a file with a WKT ...
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 ...
2
votes
2answers
441 views
How to set right coordinate system?
I have shapefile (points) which I got from adding xy data in ArcMap from Excel table. I had Latitude/Longitude data. It is area of northern Australia.
For example (5 points):
Longitude
136.882
...
0
votes
1answer
353 views
How to calculate the UTM-Latitude-band?
I have to convert a coordinate from UTM to MGRS. I think I have the most of it covered, but I have some difficulties to calculate the correct Latitude-band. How can I decide which band the coordinate ...
10
votes
2answers
1k views
Lon/lat transformation
First I should clarify I don't have previous experience with the field, so I don't know the technical terminology. My question is as follows:
I have two weather datasets:
The first one has the ...
1
vote
1answer
255 views
Convert Lat/Lon to VicGrid94
In C# how can i convert a Lat/Lon coordinate to Vicgrid94 which is described http://spatialreference.org/ref/epsg/3111/ and also ...
29
votes
3answers
4k views
LatLon or LonLat, what's the “right” way to display coordinates and inputs?
I'm trying to get a sense if this is an issue for others or every input/output should be labeled so user is not confused and just go with it?
I think almost everyone pronounces it as "LatLon". Who ...
2
votes
1answer
264 views
Arcobjects: Is my spatial reference Geographic or Projected?
I have the user select a coordinate system with the Spatial Reference Dialog. Is there a simple way to determine if the resulting spatial reference is a Projected or Geographic CS? I would of ...
18
votes
8answers
4k views
Best practices for identifying the unknown coordinate system of a Shapefile
I got a Shapefile but it's coordinate system is unknown and there is no .prj file.
How I can identify it now? Are there any tools that could help?
3
votes
2answers
223 views
Geographic co-ordinate system displayed as projected
ArcGIS suite of software categorises coordinate systems as either geographic or projected. From what I understand about coordinate systems (and I may be wrong), geographic co-ordinate systems are used ...
19
votes
3answers
1k views
What was the rationale for the non-standard UTM zones near Norway?
UTM zones 30V, 31V, 32V, 31X, 33X, 35X, and 37X do not line up with the rest of the UTM zone grid.
Why was this allowed? According to Wikipedia, UTM was developed by the U.S. Army Corps of ...
1
vote
4answers
1k views
Convert geographic coordinates to UTM zone 29N with Javascript
I have an issue converting lat longs to UTM with the ArcGIS javscript API.
Lets say that I have a map, based on the UTM zone 29N, also known as WKID 32629.
I have a known set of coordinates from a ...
5
votes
1answer
5k views
QGIS - Change unit of measure from degrees to meters
I am running QGIS 1.7.0 on windows, and I donwloaded a shapefile of census block group boundaries from TIGER. This file appears to be in the WGS 84 coordinate system, and when I open it in QGIS the ...
0
votes
2answers
191 views
Can anyone help me to determine the coordinate system of an image I need to georeference? [duplicate]
Possible Duplicate:
.shp with unknown coordinate system
I need to capture spatial information off of an old map and I can't determine the coordinate system of the image. I also need to ...
1
vote
1answer
325 views
Determining correct Coordinate System DHDN Bessel 1841
I am working on a data set and coordinates are supposed to be in DHDN Bessel 1841.
Have a look here: https://www.pegelonline.wsv.de/gast/stammdaten?pegelnr=2330013
I created a shapefile with the ...
1
vote
1answer
172 views
How do you add a WKT specified coordinate system to Arcgis?
I've got a WKT specified coordinate system, how do I add this to ArcGis?
10
votes
3answers
896 views
Is the GEO tag for QR codes lat/long or long/lat
I just found out that you can add a geographic component to a QR code.
I also just found you can create one on the Google Chart API using this:
...
1
vote
3answers
2k views
Code to convert WGS84 coordinates to British National Grid Easting/Northings
I'm looking for some code, ideally C#, to convert a WGS84 coordinate to British National Grid Easting and Northings.
Does anyone have this to hand?
I tried converting the Javascript code here:
...
4
votes
1answer
30k views
Does Y mean latitude and X mean longitude in every GIS software?
Now it's been 3 days I am using Mapinfo and it has Y as latitude and X as longitude. Is that the same case for all mapping software? As for any country their respective value is multiple of 1 or -1. ...
4
votes
4answers
6k views
Convert latitude and longitude into northings and eastings
Hi I have the following UK postcode dy8 3xt and know that the latitude and longitude is:-
54.452772
-2.156082
I also know that the Eastings, Northings for the postcode is:-
389490
283880
...
2
votes
3answers
618 views
extract lat/long from screen when using British National Grid projection
Using ArcGIS 10, is it possible to click anywhere on the map (projected to British National Grid), but return the coordinates in WGS84 lat long? Alternatively, when will Streetview work with OS ...
8
votes
7answers
788 views
Looking for a tool to convert DD to DMS
I am looking for either an online tool or one that I can download to convert DD to DMS.
For example, I want to convert from:
41.590833, -93.620833 to 41° 35′ 27″ N, 93° 37′ 15″ W ... Those are the ...
5
votes
1answer
792 views
How do I find the intersections of 2 circles on earths surface?
I have the circles' center in lat & long, as well as the radius in meters. How do I find the circles intersections?
Edit: EXAMPLE:
Circle 1: Center on Earth's surface (43.564627,-116.220524) ...
4
votes
3answers
379 views
Defining the appropriate Projected Coordinate System
I am a beginner at ArcGIS and have a technical question.
I need to assign a projected coordinate system to my boundary/polygon data in order to calculate square miles. There are many to choose from. ...
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