Angular geographic coordinates that specifying the north-south and east-west positions of locations.

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1answer
48 views

Are latitude and longitude independent of each other or correlated?

I want to develop a bivariate gaussian kernel in order to handle the random noise in my GPS tracks where each point has three parameters (lat, long and time stamp). I was wondering if latitude and ...
4
votes
3answers
123 views

Does the NED use geocentric or geodetic latitude?

What kind of latitude does the National Elevation Dataset (NED) use? Geocentric or geodetic or something else? I can't find the information anywhere on their site (http://ned.usgs.gov/index.html) or ...
0
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3answers
32 views

Calculate distance using 2 sets of lat/long values in the same record

I have a point layer with over 90K records in it. For each record I have lat/long field for incident, and lat/long for engine location. Is there a way to find the distance between Incident point and ...
7
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12answers
2k views

How do you memorize the meaning of longitude and latitude? [closed]

Longitude and latitude are concepts I usually don't need an then I sometimes suddenly need to learn their meaning for a period of time b/c I am using them. Is there an aide-memoire to finally ...
0
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0answers
29 views

Create global raster layer with latitude values of each cell in QGIS

I have a raster with a 0.0083 degree resolution (WGS 84) of which I need the area of every single pixel. An easy but compute-intensive approach is explained here but as I need to work with bigger ...
-3
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0answers
56 views

where can i find latitude and longitude of all villages of india?

i developed a website for commercial use.i already have all data(Latitude & Longitude) of all city's of India but now i require all Village's data(Village Name,Latitude & Longitude). where can ...
0
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1answer
29 views

Drawn figure looks stretched

I have written some code which offset a certain latitude and longitude with a distance in centimeters. What I am trying to do is based on a coordinate and a vector create two new points along the line ...
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0answers
28 views

How do I convert Lon and Lat to pixels in map using world file?

I have a tiff map file, with a tfw world file that has these parameters (lon/lat in radians): 0.00000107180145766 \\ A 0.0000000000 \\ D -0.0000000000 \\ B -0.0000009331315579 \\ E ...
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1answer
65 views

Postgis: Traslate geometry from EPSG:23030 to EPSG:21818, then to lat long

I'm from Colombia, South America. I'm a computer programming student and I have to develop a prototype for a GIS system for my small home town using Postgis >= 2.0 as database back-end. The local ...
0
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1answer
36 views

How can I get the circle of a sphere (on Earth ellipsoid) around a point using the Latitude and Longitude?

Specifically finding points along the circle. If possible without converting into Northing/Easting beforehand. I'm looking for the fastest possible way to calculate points in Latitude/Longitude in a ...
2
votes
1answer
63 views

What methods exist for geohash of polygon?

GeoHash is an excellent method to code the latitude and longitude of a point into a string. It's concise, due to the use of numbers + letters, and the precision can be tuned adding characters at the ...
0
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1answer
42 views

Bilateration using longitude, latitude

I have 2 coordinates (Longitude and Latitude) and a distance from them to a third coordinate. How is it possible to calculate the longitude and latitude (probably 2 possibilities) of the third ...
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0answers
35 views

50m x 50m grid around the world

I'd like to subdivide the earth into a grid of approx. 50 x 50 m cells (big database, I know). To make it more complicated (and fun), I also need to be able to determine to which cell a given set of ...
3
votes
2answers
761 views

What kind of coordinate system is this?

I have a csv with a list of the world sea ports and their coordinates. The coordinates are in this format: 5234N 00226W How can i convert this to decimal Latitude / Longitude ? Data source
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2answers
47 views

Compute the latitude of a center of mercator projection

Say I'm looking at a portion of a map that's displayed using Mercator projection with the view bounded at 40°N and 20°N. How do I compute the latitude of the point that's in the centre of that view? ...
0
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0answers
24 views

Find square with latitude and longitude for given lat and lng and distance [duplicate]

I have the coordinates of some point, lets say lat and lng, I want to find the latitude and longitude of top left and bottom right corners of the square, whose sides are located k kilometers from the ...
1
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1answer
81 views

Creating Longitude and Latitude Lines in Google Maps

I'm working on an independent high school project where i'm trying to build a simple differential equation model for diffusion. I'm trying to overlay the model on top of a map to visualize spread, so ...
0
votes
1answer
53 views

MYSQL 5.6 Cluster / chain points by distance to any other point without millions of calculations?

I have a table of approx 10,000 - 20,000 dynamic points across the globe stored as lon/lat points. I want to cluster any point within (roughly) 3km of any other point into one point (and return the ...
1
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1answer
42 views

Lat/lon of pixel inside Landsat scene

How do I find the lat/lon of each pixel inside a landsat scene. Either the equations for converting i,j to lat/lon or just a bunch of files, one for each scene. Background: I have downloaded a bunch ...
3
votes
1answer
70 views

Help identifying a coordinate system

I have some "latitude" and "longitude" data that describes the Silverstone motor racing circuit in the UK. The coordinates look something like this: latitude longitude +03124.27986 +00061.07652 ...
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2answers
129 views

Searching planet_osm_point by longitude and latitude

I used osm2pgsql to import data into my PostgreSQL database and it put gave me the following 4 tables, planet_osm_point, planet_osm_line, planet_osm_polygon and planet_osm_roads. I have looked at ...
0
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1answer
44 views

Get LatLng coordinates from SIRGAS2000 UTM 21s coords

I have a bunch of locations (36k) and they are represented using SIRGAS2000 (UTM 21s) coordinates. I need some way of converting them to traditional LatLng format so I can upload them to my database ...
0
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1answer
176 views

Extract Longitude and Latitude from Geotiff (ASTER 30m DEM)

my problem is apparently quite simple, but I cannot really find an easy answer: in QGIS I've created a raster layer by merging different GeoTiff images from the ASTER 30m DEM dataset. The merging is ...
1
vote
2answers
113 views

PostGIS to GeoJSON with GDAL: how to get lat/longs?

I'm trying to convert line features from PostGIS to GeoJSON files, as follows: from psycopg2 import * from subprocess import call conn = connect(dbname='gis') cur=conn.cursor() cur.execute("SELECT ...
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0answers
38 views

calculate distance between points crossing the antimeridian

How can I calculate the distance between two points (lon/lat) if any of the points exceeds the antimeridian (+-180 longitude)? Im using the distVincentyEllipsoid {geosphere} to calculate the shortest ...
0
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1answer
105 views

How to obtain the maximum/minimum longitude and latitude for a polygon?

I have the MSA/CMSA shape file which contains 274 metropolitan areas. How do I have to obtain the maximum/minimum longitude and latitude for an area? So, it's like drawing a box right outside and ...
2
votes
1answer
61 views

Decimal Degree data erases itself between edit sessions in QGIS

I have a shapefile with point data. I calculate the $x and $y of the points successfully I save the changes and close the edit session. Once I reopen the attribute table, the data after the decimal ...
2
votes
1answer
84 views

Compute the area of a given polygon (in vector format) lying between specified lines of latitude

I have species distributions (in vector format) and I would like to calculate how much of the area for a given species distribution is within certain lines of latitude, such as temperate and tropic ...
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0answers
36 views

Get tag/feature/landuse meta information for latitude longitude in openstreetmap

I need the possibility to find the underlying ground information of a given location (set by latLng) - not an area! I already tried the nominatim reverse search, but it lacks the landuse information. ...
0
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1answer
177 views

What is the format expected by QGis for Latitude/Longitude in DMS?

I have been struggling with a csv file I need to import into QGis 2.2.0 (on Windows 7). The coordinates are in this format: LATITUDE LONGITUDE 424605 861204 395222 861206 303051 861219 ...
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0answers
64 views

Ohio State Plane to Lat/Lon

I've looked into a few other posts/libraries as far as converting between State Plane (Easting/Northing) to get a Lat/Lon value, however I've run into some trouble. I saw here ...
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1answer
68 views

Reprojecting kml in NAD27, 83 or WGS84 using QGis

I have downloaded a kml file from Google containing location of shops. The coordinates in that file are in lat/long. I have other shp files containing roads and territories. I am trying to have all ...
1
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1answer
136 views

Converting lat-lon from degrees and decimal minutes to decimal degrees in PostGIS [duplicate]

Creating a geometry in Postgis is fairly simple: ST_SetSRID(ST_MakePoint(longitude,latitude),4326); These lat/lon should be in decimal degrees format like 33.02505 -96.70668 Is there a ...
1
vote
1answer
51 views

Census Block GEOid2 conversion to Latitude Longitude

My question is similar to this question. I have two different data files. Data1.csv (4500 rows) GEOid GEOid2 Total Population Urban Rural ...
0
votes
1answer
166 views

Convert some UTM coordinates to Lat Long

I have a series of UTM coordinates in an Excel file that I need to convert to Lat/Long. They are listed in the spreadsheet as "LONG(XUTM)" and "LAT(YUTM)". I know the coordinates are located in ...
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votes
1answer
66 views

What is the longitude and latitude of Tokyo, Japan [closed]

Please help me I need to know for a project
0
votes
1answer
133 views

Lat Long to State Plane conversion

I am using the ESRI javascript API and I have a set of lat/long points I need to convert to a state plane coordinate system. My spatial reference is wkid 3418. I can easily use the GeometryService ...
0
votes
1answer
104 views

Is it possible to use JTS for calculations on data in geographic coordinates?

I have some spatial data that has all of its coordinates as lat/lon pairs (with about 10 digits decimal precision), it's stored in a database as WGS84 data. Some of the data is represented as polygons ...
5
votes
2answers
1k views

Why is the GPS Reference Meridian 100m to the East of the Prime Meridian?

Apparently if you stand at Greenwich then your GPS will not say you are at longitude zero. This is because the GPS reference meridian is about 100 metres to the east of the prime meridian. My ...
2
votes
5answers
327 views

Is latitude / longitude a universal coordinate system?

I hear people complain: my biggest gripe with google spatial apis is that they hide the fact that latitude/longitude is not a universal coord system My question is Is latitude / longitude a ...
-4
votes
1answer
338 views

What is the max latitude and longitude values possible?

What is the max value of latitude and longitude values possible available that fit on with in the world coordinate system.
0
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0answers
26 views

Creating a point layer from lat/long coordinates [duplicate]

I have a spreadsheet that lists the lat/long coordinates of several locations I wish to map. I would like to produce a geocoded point layer in QGIS. How do I do this? Thanks!
0
votes
1answer
88 views

How to get from Lat/Lon to this format?

I have twitter data with coordinates such as: [-7.2377761, 112.73091137] I'm working with a python geo library called osgeo. The sample code indicates creating a point like this. point = ...
0
votes
1answer
45 views

Ohio DNR Oil Gas Lat / Long Conversion in ArcGIS 10.1

Is anyone familiar with the Ohio Oil Well Search off their website? For the Lat/Long, they have WH_X and WH_Y. The numbers in their do not match up with the actual Lats/Longs off the OHio Well ...
1
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0answers
65 views

LLA vs ECEF--which to choose?

I will be providing points in 3D to an external source via XML. One coworker suggests Lat/Long/Alt and another suggests ECEF. We can do either without much trouble. We have an existing product that ...
2
votes
1answer
68 views

How to use GDAL to import lat/lon points from ESRI File Geodatabas into MySQL

I have a file geodatabase from here: ftp://ftp.csc.noaa.gov/temp/MarineCadastre/AIS.SampleData.zip Using ogrinfo, I can see that it contains a layer called "Broadcast_" that has lat/lon points: ...
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vote
1answer
70 views

Lambert Conformal Conic Projection Inverse Transform after Fitting Ellipse to Noisy LLA Data

I'm using Python and Basemaps to convert some Lat Lon data to the LCC projection and back again. Since it is noisy data representing the footprint of a satellite, I am filtering it and fitting an ...
0
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1answer
343 views

Convert long/lat to indian grid system

how to convert lat/long coordinates to Indian Grid system? I've googled for a couple of days but didnt find the exact algorithm for this. and i got a link Indian Grid System. but i didnt get a picture ...
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0answers
40 views

How can I build a network from a latitude, longitude points? [closed]

How can I build a network from a latitude, longitude points? I have some points(latitude and longitude) and i wish to build my network based on this points.
2
votes
1answer
60 views

Obtain Longitude/Latitude Values and Export Data From QGIS

I have a CSV file with address data elements (Street# and Name, City, State, Zip). I'd like to be able obtain corresponding X,Y coordinate for each of the address? How do I achieve this using QGIS? ...