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

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0answers
15 views

Calculating position in SRTM grid

I'm actually trying to calculate a grid point position in a SRTM grid by row and column count. So I got a position by lat/lon, then calculating the row and column in my hgt-file (this post helped me) ...
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1answer
39 views

Analyzing long lat location data to find locations in proximity

I am looking for a tool to analyze location data (long lat values from vehicle GPS available). The goal is to identify locations which are in close proximity (within a circle of 30-60ft) and then ...
0
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2answers
48 views

convert points to same utm zone

I have lat/long and when I convert to UTM, my points are in zones 35 and 36. is it possible to "transform" or "project" (I am not sure which word is used to do this operation) the UTM coordinates from ...
0
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1answer
24 views

What lat/long formats can I use for a map data file

I can't find any clear documentation as to the formats allowed for lat/long in data files for cartoDB maps? Should Lat/long be in decimal form. Or as deg/min/sec? Or, geocoded lat/long? IOW is there ...
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0answers
13 views

liblas georeference las file and update header

I am just starting yo use liblas and I had a small issue and I am hoping that you can help me. I have next code to generate a las file with geo-referenced points: std::ofstream ofs; liblas::Header ...
2
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1answer
38 views

Convert shapefile to LonLat (R)

Just a small disclaimer: I don't have any background in cartography, hence I might have missed the answer to my question in search just because I didn't even know the keywords to look for. So, I am ...
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0answers
29 views

Geotransformation, from sat coordinates to Earth coordiantes

I'm using this code: https://github.com/mcidasv/mcidasv/blob/master/ucar/unidata/geoloc/projection/sat/GEOSTransform.java to retrieve longitude and latitude in Earth system from column, line ...
2
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3answers
71 views

How to get the latitude & longitude of the 4 corners of the Map being displayed.

I am working on Open Layer (ol3) and I want to get the Latitude, Longitude of the Corners of the map being shown at at point. I tried using map.getView().getProjection().getExtent() and converting the ...
5
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3answers
143 views

Grouping latitude and longitude coordinates by city neighborhood

I'm working on a model to predict whether craigslist apartment listings are over or under market value. I'm a complete novice with GIS. I have the lat and long as well as what neighborhood the author ...
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0answers
32 views

BC Albers X Y to Google Map Long Lat

I have a big table (with more than 1000 rows) which contains point data with BC Albers X and Y values. I need to display this data on Google Maps but I have not my PC Laptop with me now to have access ...
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1answer
64 views

How much a decimal degree is equal to in latitude 40N?

I would like to learn how much a decimal degree equals to 40N latitude as units of distance. I have this table (http://en.wikipedia.org/wiki/Decimal_degrees) in mind, but I am interested for the ...
3
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2answers
77 views

Finding the boundary polygon from a set of gridded points (no hole)

Let us consider a set of a 2-D points (longitude, latitude) each of which is centre of square grid (intersect point of the diagonals of the square). I try to make you understand what I want to do in ...
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1answer
52 views

From what latitude can you only travel south? [closed]

From what latitude can you only travel south, and from what latitudes can you only travel north? This question is probably extremely easy and I'm just over thinking it. Some explanations would be ...
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0answers
27 views

Get Minimum bounds of 4 LatLon

I have 4 Lat Lon positions. They represent a (rotated) rectangular region. But due to some calculation errors, sometimes they are not proper rectangular. I want to convert those into (rotated) ...
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0answers
26 views

Get latlong at a distance on a path

I have 2 decimal point in lat/lon. I want to divide the line drawn by lat/lon into parts each at a specified distance, lets say 'x' -- all except the last segment will be of length x -- and I need the ...
2
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0answers
14 views

I have to fetch the subdivision categories using location coordinates

I'm looking for an API where I can get second level subdivision(ISO 3166-2) if I pass longitude and latitude. Second level subdivision code reference: http://en.wikipedia.org/wiki/ISO_3166-2:GB Eg. ...
0
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1answer
49 views

Transform lat,lng into x,y

I have coordinate system with x and y. Also I need to show there x,y point but I have coordinates latitude, longitude. How I can trasform latitude, logitude into x,y to show on x,y scale?
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0answers
21 views

Determine lat/lon intersection on earth from point in space along 3d line

I have a known point in space with a lat,lon,alt. It has a camera with a line of sight and a angle of field of view. I can take the central point and calculate each corner vector of the field of view, ...
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1answer
58 views

QGIS how to 'compare' points (latitude/longitude) w/address data (zip) to a zipcode boundaries shapefile

Hello my fellow GIS brethren, I am a geography major (gis) alumni who can't remember what he learned in college! It's been so long since I dealt with geospatial data and I can't remember the best ...
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1answer
43 views

ERROR 000989 Issue with Python Script and Field Calculating distance between two long lat points

very new to scripting and I have been struggling with my script for a while. I'm not sure why it doesn't work in field calculator. I am trying to calculate a list of distance between two long lat ...
1
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1answer
239 views

How to convert local Coordinates to lat/long Coordinates

I'm using QGIS to do some data analysis and visualization for my newspaper. I received some x,y coordinates from the City of Minneapolis that I can use to build some static graphical maps shaped like ...
0
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0answers
29 views

Understanding the error term

I have some (mobile) location data from a vendor. For each user and timestamp, there are three columns: lat, long, error. I "guess" that the error means that the user is located within a circle with ...
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0answers
31 views

Calculate geographic position based on azimuth, distance and height [duplicate]

How to calculate the geographic position of an object in sky (Point B)(like an aircraft) from Home Point (Point A) based on only four variables: Lattitude and Longitude at Home Point, Azimuth at ...
1
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1answer
51 views

NAD27 to NAD83, saving AFTER transformation?

I need to measure the distance (with the ruler) of points from two different layers. One layer is NAD83 and the other is NAD27. When importing the NAD27 csv file, I specified it was NAD27. Then I ...
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0answers
83 views

Why is longitude also written as B and latitude as k?

Why is longitude also written as B and latitude as k? I see that abbreviation when working with Google maps API.
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0answers
23 views

Given a date obtain latitude and longitude where is the sun zenith

Searching is easy to find terminator line (frontier between day and night) or the position of the sun in the sky given a position on the earth and a time; but I can't find how to obtain where is the ...
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1answer
124 views

Transform lat long to state plane coordinates

I am trying to convert a set of lat long to state plane coordinates using python and pyproj. The location is Tennessee and this gave me information about the central meridian, lat origin and the proj ...
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2answers
302 views

Equations to convert from global cartesian coordinates to geographic coordinates

First, I needed to convert geographic coordinates (like those received from GPS) to global cartesian coordinates. I found an earlier question (How do I calculate a xyz-position of a gps-position ...
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2answers
62 views

Finding latitude & longitude values for both ends of a road

I am looking for a way to find latitude and longitude values of both ends of any given road. So for example if there was a site or tool that did this, I would just have to provide a road name (and ...
2
votes
1answer
78 views

Is a point within a polygon

I need help in this question. To explain briefly -- the question is: Whether a point with coordinates lng:-80.087535 lat: 42.054246 lies over or under line with coordinates: lng: -80.267831 ... ...
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1answer
74 views

Improving accuracy of mercator meters conversion to lat/lon

My question is an extention to a previous post I had here a couple of weeks ago (converting-mercator-meters-without-utm-zone). While the answer in the previous topic got me so far, I've now come to ...
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1answer
73 views

How to get longitude and latitude in degree units

When i navigate on my map , I receive the latitude and longitude, but I want them to be specified in degrees. I don't know what should I do please help this is my code: function ...
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1answer
152 views

Converting GPS cords to X Y based on wrapper

I'm trying to create some software for an airport and they require me to place icons of aircraft in their position based on GPS. I have 10x10 tiles each tile being 256x256 pixels and the origin point ...
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0answers
9 views

Calculating z coordinate for longitude, latitude Google Map [duplicate]

I have a point (lon, lat) values. Is there any service to calculate Z coordinate of this point. Google service, OpenLayers service or others.
3
votes
2answers
418 views

Convert Lat/Lon Pair to Cartesian

I'm lost on how to correctly and accurately translate Lat/Lon coordinates to XY coordinates to draw them using OpenGL. The coordinate information I have is the following: Start Lon, Start Lat, End ...
0
votes
1answer
69 views

How to find a location is inside a country?

Given a Country Code and a Lat Lng pair, I want to find whether it is inside that country or not? What is the way to do it? Is there an algorithmic way to do this? I can accept certain amount of ...
1
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1answer
160 views

How to calculate the shortest geographical distance between a line and a point? [duplicate]

I'm trying to calculate the shortest distance between a line (described as a pair of [lat, long]s) and a point (lat, long) accurately. I've read many Wikipedia pages, but I'm new to the topic. I've ...
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1answer
153 views

Converting mercator meters without UTM zone?

I've been attempting to extract track information from Humminbird (Side Imaging Sonar) binary files and have hit a stumbling block with the coordinates it provides. The values are apparently in ...
1
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1answer
34 views

Locating Moon in Sky from Earth

I am working on project which need to find moon location from a specified lat, long on earth. So basically info I am having is Lat,Long and Timezone. Format of the moon location Info? So first in ...
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0answers
33 views

Pros and Cons of a latitude adjustment grid vs other methods of area calculations

When working with high resolution global raster data in WGS 1984 I often need to calculate areas. Now the traditional way for me to achieve this has been to reproject the data to an equal area ...
3
votes
3answers
185 views

Can a shapefile, or other file, be made from Excel without coordinates

I have two Excel spreadsheets I'd like to make into shapefiles, or some equivalent. I have access to ArcGIS at work and want to try using GRASS as well. I have seen the help on doing so, but only if I ...
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0answers
149 views

Convert polygon data into extreme lon/lat coordinates using QGIS

I'm very new to QGIS. I have a shape file of census blocks and want to use the data to plot points within each boundary using Google Maps api. I figure the best way to do this is to find the extreme ...
1
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1answer
47 views

Load feature class with tab delimited file that is missing Lat/Long

I am working on a Python script that receives a nightly tab delimited flat file. This flat file has Latitude and Longitude fields and the script loads the data using the gp tools Make XY Event Layer ...
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0answers
21 views

gdaldem slope attribute passing

How to pass slope attribute to the command "gdaldem slope manj.tif outpiu.tif -p use percent 45 -s 111120/370400" It's giving error like FAILURE: Too many command options. give any ...
1
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1answer
62 views

Adding a latitude/longitude graticule in CartoDB (e.g. WMS)

I'd like to add a basemap that has a graticule in latitude/ longitude to the Map View of a CartoDB project. This could be in the WMS format for example, but I haven't been able to find one that ...
3
votes
1answer
210 views

Creating .shp from .dbf in ArcMap?

How do I create a shapefile using the latitude and longitude information in my dBASE table? I am using ArcMap 10.1
1
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2answers
116 views

Cannot convert dms to dd in Excel 2007 using VBA code

I am trying to convert the data in an Excel sheet from dms (degree-minute-second) to dd (decimal degree) format using the vba script available here. Here is sample data: 53° 0' 39.31" 6° 44' ...
2
votes
2answers
293 views

Mercator: scale factor is changed along the meridians as a function of latitude?

"In Mercator projection the scale factor is changed along the meridians as a function of latitude" How to calculate the Mercator scale factor as a function of the latitude in decimal degrees ? ...
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1answer
150 views

How can I measure area in square kilometres from lat / lon gps coordinates?

I have code from openlayers that I cannot quite handle because I am so new for these kind of codes. My main goal is to measure area from n amount of lat/lon gps coordinates and convert the result into ...
2
votes
0answers
66 views

Lat Long to Useable values in QGIS

I am using both QGIS 1.8 and 2.0. So either is helpful. A client has given me locations of trial pits but i cannot load them into QGIS no matter how hard i try. For example, 50°24.711 North ...