Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.
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0answers
12 views
how to test lat long points within a distance using MySQL [duplicate]
How to test query for lat long point within a distance in mysql
can u give me some dummy lat long point which give some result according to distance.
4
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2answers
116 views
ST_Distance is not delivering right results
I want to calculate the distance between lat/lon points.
I tried the following queries:
Select
ST_DISTANCE(ST_GeomFromText('POINT(-73.97923 40.75571)', 4326), ST_GeomFromText('POINT(-73.974509 ...
19
votes
3answers
988 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 ...
1
vote
0answers
74 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:
...
0
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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. ...
1
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0answers
265 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
1answer
42 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
90 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
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0answers
68 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
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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 ...
0
votes
1answer
149 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 ...
1
vote
1answer
130 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
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0answers
59 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 ...
0
votes
2answers
69 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 ...
1
vote
1answer
172 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 ...
2
votes
1answer
219 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
137 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 ...
0
votes
1answer
54 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?
2
votes
0answers
120 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
195 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
155 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
179 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
124 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 ...
4
votes
1answer
96 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 ...
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
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0answers
69 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
232 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 ...
2
votes
2answers
235 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
92 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
181 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
94 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 ...
2
votes
3answers
186 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 ...
4
votes
1answer
249 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 ...
2
votes
0answers
197 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
100 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
70 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
97 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
...
5
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 ...
1
vote
1answer
203 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
242 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 ...
1
vote
0answers
64 views
What to use to divide longitude on smaller parts than time zones?
I have a database of earth's grid, I have consolidated elements from 1152x576 to 360°x180° and then those degrees into geographical zones and time zones so I get 5(6) geographical zones (N/S frigid, ...
2
votes
1answer
237 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.
1
vote
0answers
56 views
How to Convert Long/Lat from Excel into shapefile? [duplicate]
Possible Duplicate:
How can I convert an excel file with x, y columns to a shapefile?
Possible duplicate,
How can I convert an excel file with x, y columns to a shapefile?
How do I ...
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
109 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
733 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?
1
vote
0answers
23 views
Translate geographical coordinate [duplicate]
Possible Duplicate:
Calculating Lat/Lng X miles from point
I would like to know how could I translate a geographical coordinate to an specific distance. So for example let's suppose I'm ...
5
votes
2answers
289 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
70 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.
...
