An angular geographic coordinate that specifies the north-south position of a location.
4
votes
1answer
426 views
How to get latitude /longitude in Degree Minute Second (DMS) using QGIS field calculator?
I have come up with the following expression to convert 5.1234 to 5° 7`24.24"
toint ($x) || '° ' || toint((($x) - toint ($x)) * 60) ||'`' || substr( (tostring(((($x) - toint ($x)) * 60) - ...
3
votes
2answers
518 views
How to calculate how long an arc second is for a given long/lat?
The title says it all, really. I am wondering what area is covered by a dataset which is one arc second wide.
Thanks,
Rob
2
votes
3answers
1k views
Income data on a block level: how does a newbie do it?
I am a complete newbie at GIS data, and am trying to do the following:
Figure out census blocks in Miami-Dade (and several other counties) that have average household incomes > $75,000
Get the ...
2
votes
2answers
1k views
Problem when calculating longitude and latitude for points
I have a PostGIS database with SRID=900913 (Google Mercator) and I would like to know the latitude and longitude of points.
I use this command:
ST_X(ST_TRANSFORM(the_geom,4283))
Following what is ...
2
votes
1answer
253 views
Getting zone from UTM in order to convert to latlong
I am trying to convert UTM to a latlong point. To get that done I need to know the zone where the UTM coordinates are. how can I find the zone from UTM?. the place coordinates that I work on lay on ...
0
votes
1answer
301 views
How to convert Singapore Onemap Co-ordinate to Google maps co-ordinate system
I have to fetch few 3000 co-ordinates (I am Geo-coding ) and convert it into Google map co-ordinate system.
Following is the process I am doing
I am calling Mapone.sg API for geo-coding in return ...
1
vote
1answer
777 views
How to find bounding coordinates (lat/long) for UTM zones?
I want to error check incoming lat/lng points by checking if the point resides within the given UTM zone. (This would work for the data im using because sometimes there is a missing sign or lat/lng is ...
1
vote
2answers
497 views
How to make distance calculated using Latitude and Longitude more accurate
I'm coding a Web App whereby users can choose their city (start) and a destination city, and find out the approximate distance between both cities, using Latitude and Longitude of both cities to ...
1
vote
1answer
639 views
How do I calculate ECEF X,Y,Z velocities for GPS if I have no satellites
I'm attempting to simulate a GPS message where know variables are starting location, ending location, speed (m/s), and a bearing (0 - 359 degrees). How can I calculate the ECEF X, Y, Z velocities ...
0
votes
0answers
49 views
Calculate XYZ velocities between 2 ECEF points [duplicate]
Possible Duplicate:
How do I calculate ECEF X,Y,Z velocities for GPS if I have no satellites
If I have a starting location (Latitude/Longitude), a bearing (degrees), and a speed (m/s), how ...
8
votes
2answers
2k views
How do you compute the earth's radius at a given geodetic latitude?
(I see there is an equation on wikipedia that does exactly what I am asking but there is no references. I have no way of confirming the validity of this equation!)
I already understand the difference ...
2
votes
2answers
1k views
How to convert geometry coordinates into Google lat/lons?
For storing geospatial data, the geometry field is used in SQL Server or Oracle Spatial. I want to know is there any way where we can convert this geometry field into a set of latitudes and ...
1
vote
1answer
1k views
How to add longitude / latitude to a world map in Mapinfo professional?
I am a novice in Mapinfo Professional. I have imported a shape file of the world map into MapInfo. It's projected as Lambert azimuthal equal-area projection (ETRS89). Is it possible to show the ...
1
vote
3answers
445 views
Finding X, Y of nodes in feature layer
I have a map document in ArcMap and I want to find X and Y of my nodes in a special feature layer. I look through my access database and I just find the Shape Index table which has MinGX, MinGY, ...
1
vote
0answers
105 views
Calculate Point C using distance and bearing from points A and B? [duplicate]
Possible Duplicate:
Calculating Lat/Lng X miles from point
I'm from old school so have not done math for ages. So I need some help to solve this problem, please :)
I have two points such ...
8
votes
1answer
969 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
0answers
316 views
mixing lon/lat and mercator layers in a MapServer .map file
I have a basic question about my MapServer .map file, which has two layers, each with a different coordinate system, longlat vs. mercator.
See my .map file below. If I leave it as shown below, with ...
0
votes
0answers
52 views
Caculating Longitude and Latitude for Moving Object [duplicate]
Possible Duplicate:
Calculating Lat/Lng X miles from point
I don't know how to ask the question, so I'll explain my requirments -- I hope I'm in the right site :)
Let's assume that a ...
2
votes
1answer
383 views
How to determine maxResolution and numZoomLevels in dynamic environment?
I want to determine resolution and number of zoom level dynamically instead of inputting the values in openlayers client. When the user move the position on map by dragging or panning control, I can ...
2
votes
3answers
115 views
What Danish position format is this?
I have been given a list of locations within Denmark. Most of the are in decimal degrees. However, some of the positions are in different formats and I can't figure them out. Does anyone recognize ...
4
votes
2answers
377 views
Converting Geocentric to Geodetic
I am only looking for a confirmation of what I believe to be true. If my explaination or conclusion is not accurate I would appreciate it if the reason can be explained to me.
Background ...
2
votes
2answers
467 views
Creating Latitude Grid from DEM
I am trying to evaluate an equation in the raster calculator and I need latitude values. I have the DEM for the region and am wondering if it is possible to create a latitude raster based on the DEM?
...
5
votes
1answer
269 views
How can I programmatically open an OnPoint map to specific coordinates?
We have an OnPoint server at work and I'm wondering how to open the mapping service and having it zoom in to my specified latitude and longitude.
The reason I ask is because we have an application at ...
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. ...
12
votes
2answers
374 views
How do you find a lat/lon (DMS) on a paper map using a 30cm ruler?
How do you use a 30cm ruler to find DMS on a paper map? The locations I would like to find are the 'corner' points so I can generate an extent based on the four corners.
I have an old paper map (3 ...
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
2answers
125 views
Get All Records 60 Degree North in SQL with query on Lattitude-Longitude Column?
i have table with latitude & longitude columns in sql.
how can i select all records with lat-long 60 degree north> ( Arctic Region )
Thanks
Pragnesh
-5
votes
2answers
724 views
Coordinate Conversion: Decimal Degree to Deg-Min-Sec of lat/long Coordinates [duplicate]
Possible Duplicate:
Looking for a tool to convert DD to DMS
I have two sets of climatic lat/long point data in excel worksheets. One of them is in decimal degrees and another is in ...
38
votes
2answers
17k views
How to measure the accuracy of latitude and longitude?
I am very new to GPS stuff. Suppose I have latitude and longitude as 19.0649070739746 and 73.1308670043945 respectively. So now both co-ordinates are 13 decimal places long. But sometimes, I also get ...
5
votes
2answers
1k views
Convert Long and Lat Co-ordinates to Square Miles
I have a set of Long and Lat co-ordinates making up a five point polygon which I have converted in excel using the following formula:
...
8
votes
3answers
2k views
Computing an averaged latitude and longitude coordinates
How can I compute the average between several latitude and longitude spots ?
Should I just compute the Arithmetic mean for both lat and lng ?
thanks
11
votes
2answers
1k views
Why latitude/longitude and not the other way round?
When you google "latitude/longitude" you get 10 times more results than "longitude/latitude". This I find very confusing as "x/y" seems 20 times more common than "y/x". But on a map Latitude is on ...
3
votes
2answers
249 views
Can one hide the Lat/Lng information sent to Google maps?
most services that use google maps have the Longitude / Latitude stored in the source to be sent to google maps to render their markers.
However on this site (sorry Chinese)
...
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 ...
