Tagged Questions

An angular geographic coordinate that specifies the north-south position of a location.

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2
votes
3answers
160 views

Looking for a fine U.S. Latitude and Longitude grid (0.25, 0.5 degree)

There is a global latitude and longitude grid data available at 1 degree resolution and higher (http://www.arcgis.com/home/item.html?id=f11bcdc5d484400fa926dcce68de3df7). Is anyone aware of a finer ...
0
votes
1answer
119 views

convert GPS to x,y using reference node

i am using sensor nodes and their antenna to calculate GPS coordinates as notation of (degrees/minutes/seconds), i have some question of how to do these things: how can i convert latitude and ...
16
votes
3answers
574 views

Why do we use the terms “longitude” and “latitude” for a spherical body?

To specify a geographic coordinate we use the terms “longitude” and “latitude”. Far as I know, these terms derive from the Latin latitudo (= breadth) and longitudo (= length). In German we use the ...
4
votes
1answer
79 views

Display XY Format to Shapefile (Scale)

Using ArcView 10.1 and using excel for Lat/Long conversion to a shapefile. The original Lat/Long has 7 numerical characters past the decimal point xx.1143717. When I convert this excel into a ...
1
vote
0answers
42 views

Using gdal to convert from UTM to equidistant lat/lon

I am getting rather confused with converting a UTM gridded dataset into a equidistant/rectangular latlon gridded dataset. Can anybody help me? I have a UTM set with the following projection: ...
1
vote
0answers
118 views

convert GPS to XY coordinates

if i have obtain GPS coordinates as Latitude/Longitude, then i need to convert them to XY coordinates, i see this link actually i need to get the Trilateration , in its equation i need the XY ...
0
votes
0answers
27 views

A machine to measure latitude to 6 decimal places of a degree [duplicate]

I am doing a PhD research project to do with medieval and ancient archaeoastronomy which requires me to be able to measure latitudes up to an accuracy of 6 decimal places of a degree of latitude. ...
0
votes
1answer
49 views

Shrinking the co-ordinates into a unique number

I have a bunch of data's in my gpx files. I would like to shrink those bulk data's(co-ordinates) into a single ID or sort of something. any suggestions?
0
votes
1answer
40 views

error in estimate distance?

i do some experiment place two sensor node between them 4 meter as distance. then i get these GPS information: node1: Latitude: 32, 33.255 , Longitude: 36, 0.6632 node2: Latitude: 32, 33.228 , ...
1
vote
1answer
75 views

find euclidean distance in GPS [duplicate]

i need to find the distance between two gps location, So i think to do this: lat1(seconds)-lat2(seconds)=lat * 30.7151 == distance latitude in meters =Latm long1(seconds)-long2(seconds)=long ...
0
votes
0answers
52 views

Long/lat to tile row and column for a certain layer on EPSG:900913

I have a bunch of XYZ layers rendered in OpenLayers. I want to give a lon, lat and Z value and the system would return the X and Y location of the tile of that XYZ layer. I found the following 2 ...
0
votes
0answers
26 views

Simulating Random Movement Google Maps [duplicate]

Hi i have a pair of longitude and latitude coordinates and i would like to make a marker move on a map the path that it moves should be randomly generated however i want the marker to move 1 km every ...
1
vote
1answer
99 views

Accurate and fast nearest neighbour, which distance function should I use and how to it speed up? [duplicate]

I am solving the following problem: I have a map with many points in it and I need to find the nearest point to given location. Each point carries information about it's latitude and longitude. This ...
0
votes
0answers
42 views

Offset a Polygon defined in Lat Lng points by a given distance of miles or km

I am trying apply a positive offset/buffer (enlarge a shape equally from the borders) to a polygon that is made up of a series of latitude/longitude coordinates by a distance that is defined in either ...
1
vote
1answer
127 views

What format is lat/long stored in OSM PostGIS?

Question: How do I to get the lat, long for all the toll booths stored in OSM for Virginia? Current Query: > gis=# select * from planet_osm_nodes where ('toll_booth' = ANY(tags)); id ...
0
votes
2answers
64 views

Getting a “square” of lat/lon for database query [duplicate]

So I want to get the square formed by a single point of lat/lons, my plan was to take that point's latitude, divide by 360, and multiply by the circumference of earth. Giving us the distance from the ...
2
votes
1answer
165 views

WGS84 - how to convert

I have multiple locations saved in WGS84 - it looks like e.g. latitude: 12345678 longitude: 87654321. I tried to search it on the map this way: 12.345678 87.654321, but it doesn't match the place it ...
2
votes
1answer
109 views

Trilateration 3D - Vincenty's Formula

with reference to Trilateration using 3 latitude and longitude points, and 3 distances. The accepted answer was votes as shown in wikipedia at: http://en.wikipedia.org/wiki/Trilateration in ...
1
vote
1answer
542 views

How to convert Lat & Long from Onemap.sg to Google Maps

I have a set of address for Singapore, I would like to take the Lat & Long from onemap.sg (SYV21: X, Y / Easting, Northing) and then store it in my databse , convert into (WGS84: Longitude, ...
2
votes
0answers
100 views

calculating bounding box from known centre coordinate and zoom

I have a map, the centre of that map (centrepoint) is = -37,175 ( gps) I know the zoom of the map = 13 I know the size = 320x320px I know there is 111111m in a degree of latitude and a varying degree ...
1
vote
1answer
147 views

Lat Long line intersecting with circle

Can anyone help me what's the algorythm to calculate points of intersection whet is given one point p1 [lat,long] , bearing x (let say 137 degrees), arc center [lat,long] and radius? I woulde like to ...
6
votes
1answer
147 views

locating latitude-longitude point in a piste-map with matrix transforms

I am trying to plot points of a particular latitude longitude on this image of a Swiss mountainous landscape. What I am doing is I have some 54 known location-points plotted on this image (not ...
8
votes
1answer
158 views

Great-circle lines in Equirectangular projection

Just to check that I'm on the right track: Are all great-circles on the sphere and in equirectangular projection (i.e. latitude, longitude pairs) either: meridians (i.e. going pole to pole) of the ...
5
votes
1answer
114 views

How do I georeference a ski map?

I have a map of a mountainous landscape, http://skimap.org/data/989/60/1218033025.jpg. It contains a number of known points, the lat-longs of which can be easily found out using google maps. I wish ...
0
votes
1answer
36 views

Does anyone know of an explicit formula that I can plug-n-chug with to convert WGS84 lat lon to kilometers or miles? [duplicate]

I have a lot of lat lon coordinates in WGS84 format and I'm trying to get those into kilometers so that I'm able to calculate distance.
0
votes
0answers
60 views

How to convert ISO 6709 cordinates?

I would like to convert ISO 6709 coordiantes to string ? For example Latitude: 1002.0672 N Longitude : 07624.1767 E Can you provide Java function ? I go through it , but didn't get the answer..
4
votes
2answers
183 views

How to extract values from a raster according to Lat and long of the values?

having 12 files with 12 hdrs for one year: these files are raster (projected WGS84,lat long):https://echange-fichiers.inra.fr/get?k=rLSyoavrnifGyH5XrlO samples = 1440 lines ...
3
votes
3answers
149 views

How do I sort polygons by their latitude?

We have a set of polygons which we would like to sort and number according to their latitude. This will make it easier for local authorities to relate to the numbers of the objects. I have looked ...
4
votes
1answer
1k views

How can I render latitude-longitude coordinates on a map with D3?

I am trying to overlay dots of arbitrary sets of longitude-latitude coordinates on top of a United States map. So far I have found the D3 cartography example, but when I try to place dots on X,Y ...
2
votes
2answers
211 views

How to avoid exceeding latitude and longitude limits, when importing a .csv file?

I am currently working with a project with "on the fly"-projection (WGS 84 / UTM zone 32U). Now I want to import a csv. file with points, which have a longitude and latitude using the "Add Delimited ...
3
votes
1answer
76 views

East North Format

I have a database with a list of address and their location as an East and North coordinate. An example is: East=431833 North=336684 Postcode=DE22 4LF When I try to convert this address using this ...
2
votes
1answer
159 views

How to georeference using Latitude and longitude in QGIS?

I'm trying to georeference a picture using Latitude and longitude. The points are these: top-left: (116.30950927734372,39.970805680527725) top-right: (116.35620117187497,39.970805680527725) ...
2
votes
0answers
86 views

how to convert lat and longitude into distance near poles?

I am trying to convert latitude and longitude into meters in polar regions. I am looking for higher accuracy upto 0.00 meters preferably. I tried the haversine formula but it doesnt seem to be ...
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 ...
4
votes
1answer
206 views

Problems with lat long projection

Hi this seems like it should be an easy problem, but its been giving me a headache. I have a .xls spreadsheet with about 60,000 rows. Most of them have Latitude and Longitude. I simply want to ...
1
vote
1answer
238 views

USA Contiguous Albers Equal Area Conic

How do you convert from USA Contiguous Albers Equal Area Conic to meters? Or, to latitude and longitude? I am using ArcGIS 10.1, and within it, ArcMap. The shapefile I have reports the coordinates ...
1
vote
1answer
760 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 ...
2
votes
0answers
190 views

Convert Lat/Long to UTM specifying which zone to use (Java)

I have a set of coordinates in decimal degrees spread across two UTM zones in my Java application that I want to export to use in Petrel, so they need to be in the same UTM zone. Is there a java ...
0
votes
1answer
99 views

If the Earth was flat, what unit of measurement would distances between geographic points be represented as?

A whole lot of abstraction- given two longitude/latitude points given from a GPS, I'm using the Pythagorean distance formula to find the distance between them. What unit of length would the distance ...
2
votes
1answer
65 views

Representing degrees between -1 and 0 in Degrees:Minutes:Seconds

When representing latitude and longitude in degrees, minutes and seconds, with -180 <= D <= 180 (or -90 and 90) 0 <= M < 60 (0 if D is at an extreme) 0 <= S < 60 (0 if D is at an ...
1
vote
0answers
95 views

Google earth incorrectly rendering coordinates?

My circles are rendering funky on the poles, and along the equator. Here are my coordinates: 158.05553767833,-78.151355482613 152.68654993135,-76.924955252783 147.72303124605,-75.713526831152 ...
1
vote
1answer
194 views

Converting a shp file to a list of latitudes and longitudes

I have a shp file with the latitudes and longitudes for the boundaries for various geographic regions. I'd like to convert the shp file into lists of just latitudes and longitudes for the regions. ...
4
votes
3answers
214 views

Canadian province boundaries in latitude and longitude

Are there any datasets available that give a list of latitude and longitude points for Canadian province boundaries? I don't need anything too detailed as I'm displaying collated data in smallish ...
2
votes
1answer
486 views

Plotting latitude on to a (Mercator projection) SVG representing a country map

I want to convert (google sourced) longitude and latitude coordinates to x and y to place points on a SVG map I can get the longitude converted to X but I can't nail latitude. ...
2
votes
1answer
210 views

How can I get the corners of a polygon in latitude and longitude?

How can I get the corners of a polygon -a square/rectangle, to be precise- in latitude-longitude format by using its geom value -or some other way, perhaps-? Thanks.
0
votes
0answers
15 views

Using PostGIS to create a grid map and count points in grids [duplicate]

Possible Duplicate: How to create a regular polygon grid in PostGIS? I'm trying to divide the map of an area into 1 km x 1 km square grids and ultimately, count and retrieve how many points ...
1
vote
2answers
102 views

Does it make sense to create graticules using UTM meters?

Here's what I think I know, but I'm a geography newbie, so please correct any misconceptions I have, especially with regard to the term graticule. A graticule is a specialized grid where the lines ...
1
vote
2answers
692 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 ...
3
votes
1answer
75 views

Which of these is the proper convention? [duplicate]

Possible Duplicate: Difference between lon and lng I run over these three abbreviations: "lat/lon" "lat/long" "lat/lng" Are they equal?
37
votes
2answers
16k 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 ...

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