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

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9 views

How to convert from Cartesian (X,Y) to WGS84 Lat Lon

Given that I know the origin and the x and y cartesian coordinates. How do I find the corresponding lat lon? lat = lat_origin + ((y / 1000.0) / (111.319 * rad_to_deg)); lon = lon_origin + ((x / ...
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8 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 ...
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2answers
40 views

How to find a point some n meters away from lat/lon [on hold]

How to calculate x meters towards East and y meters towards North of a lat/lon? Lets say I have a point 34.1940751,73.51049 I want to calculate lat/lon of the new point some 3250193m East and ...
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1answer
25 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 ...
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2answers
42 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
23 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 ...
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1answer
58 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
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1answer
51 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
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1answer
41 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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26 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. ...
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1answer
55 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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42 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
38 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 ...
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1answer
37 views

Create geometry from decimal lat/lon instead of degrees

Creating a geometry in postgis is fairly simple: ST_SetSRID(ST_MakePoint(longitude,latitude),4326); But these lat/lon should be in decimal format like 33.02505 -96.70668 Is there a way/function to ...
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1answer
30 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 ...
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1answer
70 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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1answer
41 views

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

Please help me I need to know for a project
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1answer
53 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 ...
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1answer
56 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 ...
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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
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5answers
271 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 ...
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1answer
59 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.
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25 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!
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1answer
72 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 = ...
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1answer
32 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 ...
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0answers
49 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
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1answer
37 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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1answer
41 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 ...
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1answer
117 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
35 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
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1answer
38 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? ...
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1answer
46 views

Area Solar Radiation tool - many rasters with different lats and zs

My problem is as follows: I want to count direct radiation for all Europe. As the Area Solar Radiation (ASR) tool allows to work only on small landscapes, I cut my raster-Europe into fragments with ...
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2answers
98 views

How to calculate position in a picture based on latitude/longitude

I have got a picture on which a user manually marks some points. Let's say for simplicity's sake these points always create a 4 point convex polygon. For each one of these points I know latitude and ...
2
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2answers
137 views

How to find the row that has a shape file containing a lat long point in my PostGIS geometry column

I am fairly new to PostGis and I'm trying to return a row in my table that has the shape file containing a lat long point I pass in via st_contains. Below is a query I wrote myself that brings back 0 ...
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0answers
66 views

extract country code from lat long submission - offline

1) need to extract the country code 3166 from a lat long submission (example http://ws.geonames.org/countryCode?lat=-16.03&lng=167.2 2) want to localize that data set of country coordinates if ...
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2answers
55 views

How to update polygon longitude if negative?

I have a polygon, with longitude in [-180, 180], with 2 parts around the dateline. I want to make a map centered on the date line. My plane is to: 1./ update the longitude, so that if lon < 0 , ...
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0answers
44 views

How to source the boundaries(latitude/longitude) information for US states, cities, Zip level

I am trying to color code the states, cities, zips differently based on certain parameters. As the user zooms in they should be able to see the different colors dynamically painted on the maps. Was ...
3
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3answers
265 views

Formula for coordinates (lat, lon), azimuth and distance.

I would like to know how to find a set of coordinates on a small circle some distance from another point. For example, lets say A = (39.73, -104.98) #Denver B = (39.83, -106.06) #point ...
2
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2answers
354 views

How to convert 6 digit Latitude & 7 digit longitude to degrees

Sorry, but I'm a bit knew to the whole GIS world, and though I am making great headway drawing Polygons and such in Bing Maps, I am currently stuck. In our SQL Spacial Data, I came across ...
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1answer
75 views

How to determine vector between two lat/lon points

For all the math geniuses out there...given two lat/lon points (point A and point B), what is the simplest way to find the vector needed to reach point B from point A. For example, the vector needed ...
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2answers
234 views

How to change shapefile longitude from -180 - 180 to 0 - 360?

I have a shapefile of world countries, with longitude between -180° and 180°. How can I change the shapefile (eg. with ogr2ogr) for having longitude between 0 and 360°. Following OSGEO/Trac ...
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0answers
46 views

OpenLayers Permalink getCenter() Returns strange values

I'm extending the openlayers permalink class to create a custom class that can create a link on the map with an href attribute that points to ...
3
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3answers
241 views

How to draw (or add) a line indicating a specific latitude/longitude?

I'm trying to add a single line that show a specific latitude (e.g. the Tropic of Cancer) I don't want a gird but only a single line even in a vector layer.How can I do that I've try with pyQGIS ...
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0answers
144 views

How to add lat/lon data in ArcGis 10.1?

How do you add xy data to a DEM Raster in ArcGIS 10.1? I have done this before, and it has worked just fine. However, when I recently tried adding a MS Access database which has lat/lon coordinates ...
2
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0answers
129 views

How to add XY coordinates (latitude/longitude) to a DEM raster in ArcGIS 10.1

I would like to add xy coordinates of about 10 sites to a raster. I am using ArcGIS 10.1 and my xy coordinates are on Access 2013 database - saved as .mdb. The steps I have taken so far: 1) In ...
3
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1answer
97 views

Longitude range NETCDF vs ASCII

I am trying to preprocess a netcdf dataset with arcgis such that it has the same extent, cellsize and format as an ascii dataset I am using. Both are visualized in the image below: The big one in ...
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79 views

Doubt in Field Calculator

I am working in an project.I have a point Shapefile its projection is NAD83(HARN)Pennslyvaniasouth(ftUS)*EPSG3365* when I measure its distance(between two points) it gives me the answer in feet .yes ...
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2answers
147 views

Latitude - Longitude bounds from GeoTIFF info

here's the content of a GSFC-generated GOES TIFF image: GOES 13 Imager frame 66 at UTC 12:45:53.520 day 312 of 2013 Vis pixels : 9061, 22912 lines : 2845, 10152 Vis Lon : 999999,-23.1566 ...
0
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1answer
92 views

How to display coordinates of a point in a projected cooridante system?

I want to check the coordinates of a point. On selecting this point in ArcGIS it displays a latitude and Longitude . In ArcGIS I found an option in 'Identity Tool' that the Latitude and Longitude ...
2
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2answers
133 views

Exporting polygon shapefile with lat/lon points

By copying rows of the attribute table of a polygon shapefile, I figured out how to extract the points of the given polygon but to my surprise, they are formatted backwards: POLYGON(( ...