Tagged Questions

Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.

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5
votes
2answers
259 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, ...
2
votes
1answer
67 views

Need software to read geo information from tif

I am trying to verify the lat/lon and ECEF values that I have determined for a very specific and unusual situation (a geotif file), and it would be great if I could find some software to read them. ...
4
votes
2answers
376 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 ...
3
votes
2answers
510 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
248 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
300 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 ...
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
3answers
438 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
2answers
493 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
629 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 ...
1
vote
1answer
1k views

Where to find World Latitude and Longitude Grid (arctic circle, equator, tropics..) in shapefile/ e00?

i was wondering if you could teach me how to find World Latitude and Longitude Grid (arctic circle, equator, tropics..) in shapefile/ e00? I saw some of these datas affiliated with universities but ...
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
0answers
104 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 ...
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 ...
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
0answers
314 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
380 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 ...
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 ...
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 ...
5
votes
1answer
268 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
371 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 ...
1
vote
2answers
124 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
719 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 ...
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
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) ...

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