GPS is a space-based satellite navigation system that provides location and time information.

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GPS Coordinate Handling

I have a text file with consecutive coordinates of gps data for ongoing and incoming route(on Same road). i want to convert them in line format. how can i normalise those extra coordinate so that i ...
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62 views

Aligning two layers captured in different coordinate systems

I have two layers, one of points (locations of fruit trees) and one of Atlanta zip codes, in an ArcMap, but the layers are not aligning. The zip codes are in the top right and the fruit points are ...
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2answers
625 views

What class/types of smartphone chipsets support GPS, A-GPS, GLONASS AND have extended kalman filtering?

I've been testing several Android phones (all running Android 4+) Sony Xperia T, Moto G, Nexus and HTC 1 which are all giving decent tracks (all of which use GPS/GLONASS) However we are also using ...
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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 ...
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85 views

How WiFi can tell my exact location? [closed]

There is no GPS installed in computer PC/laptops. Please let me know how WiFi can show my exact location.
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88 views

GPS tracking in ArcGIS Engine application

Is there an ArcGIS api for ArcObjects /.Net that I can use to build a function in an ArcGIS Engine 10 application that allows me to track a GPS signal and display the movement plus lets me export and ...
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1answer
24 views

European route E4 in geodata format

Good morning, Has anybody locate any kml, shp or gpx file with the complete European trail E4 ? Lots of google search navigates me to nowhere ... Dimitris
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60 views

Interpreting U-Blox GPS receiver data

Currently I'm writing software for a simple device for car, which will compare car's location to database locations and alert user. I'm using U-Blox 5 series GPR receiver. Reference manual is here. ...
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1answer
261 views

What is required for post-processing differential correction? (And can Garmin units provide it?)

2 very closely related questions about differential correction with a Garmin unit: 1). Some data was collected using a Garmin GPSMAP 76Cx unit and the data collectors are interested in whether ...
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90 views

best free easy GPS software? (not necessarily 'real' GIS)

Our search and rescue group is looking for some advice on what free and user-friendly (no computer savvy required) software folks could use to interact with their own GPS. Doesn't have to be a 'real' ...
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2answers
645 views

How do GPS/Glonass/Galileo satellite know their position?

We use satellites to calculate our position. How do satellites know their position if it is right or wrong ? I have heard that the base station records and corrects the satellite path but how do they ...
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95 views

How to determine and send alert SMS for next bus stop in a GPS tracking system?

In my gps tracking system (PHP/MySql) I have got 5 Stops for a vehicle. Whenever the bus reaches stop 1, the passengers at stop 2 should get an SMS alert. And in the same way for the sops followed ...
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118 views

GPS data cleaning - Sampling of track data

I have gotten a fairly large polyline-dataset of GPS-recorded tracks. I'd like to have a sample along the tracks for different variables. The problem is that the data has overlapping tracks. This ...
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11answers
2k views

Location-based game using GPS

I am not sure if this forum is proper place for that kind of question but i hope to get some advice... I looking for some scenario (examples, ideas) for urban game (location-based game) with usage of ...
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2answers
101 views

consistency of cell phone gps readings

I want to record the location of each grave site in a cemetery for overlaying on Google maps. My Android cell phone (HTC Thunderbolt) reports an accuracy of between 10 meters and 25 meters. I'd like ...
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1answer
50 views

How to load sample points or coordinates on GPSMAP 62s? [duplicate]

Does anyone know how to upload 100's of sample points or coordinates from the GPSMAP 62s series to a computer? Does anyone also know the steps to create beeps or alarms when we approach these points ...
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4answers
126 views

Linking up GPS points taken from rail network

Bit of a newbie here, trying to work out whether any PostGIS functions can help with my task. Apologies in advance if my use of GIS terminology is not up to scratch yet. I have a large database of ...
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1answer
70 views

Does India Have a CORS (Continuously Operating Reference Stations) Network?

Does India have a CORS (Continuously Operating Reference Stations) network? If yes, can anybody provide more details about it?
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405 views

Microsoft Surface vs. iPad for mapping

I was recently introduced to the Avenza PDF app for iPad and I've been using it in the company I work for to help our field crews find their way around, and record waypoints and tracks. The app takes ...
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1answer
82 views

How can I transform Real-time Local position system coordinates into GPS/WGS84?

I have a local coordinate system built with Ubisense sensors and tags (it is a real-time locating system used to automatically identify and track the location of objects or people). The local ...
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112 views

How to approximate point to segment distance on sphere?

I would like to approximate the distance of a line segment from a reference point on the map (coordinates are gives as lat/lon). In the Cartesian coordinate system I would simply find the closest ...
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37 views

Terrasync COM Port Unavailable

I have a Trimble GeoExplorer Series GeoXM that runs Windows PocketPC version 4.2 (Built March 15 2004 for a bit more resolution there). Lately when the unit has been out on a job it will periodically ...
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67 views

How to determine the Geoid model used by GPS receiver?

I have the following NMEA output by Holux M-241 GPS receiver: $GPGGA,144014.000,2227.0987,N,11410.1382,E,2,6,1.67,32.6,M,-1.3,M,0000,0000*7B I know that WGS84 height is higher than geoid height 1.3 ...
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33 views

How can i show online temporal data using Tracking Analyst?

I have online GPS tracking data . I'd like to show these data in webgis . I'm using ArcGIS Silverlight API . I used tracking analyst in Arcmap for offline temporal data but not online data. Is there ...
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1answer
66 views

How to debug Live GPS and base layer alignment issues in QGIS?

I am trying to use a bluetooth GPS with a couple of base layers in QGIS. The GPS/bluetooth connection seems to be working great...I can connect and disconnect without issue. I've set my project CRS to ...
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3answers
2k views

Can *.ssf files from Trimble GPS be imported as features to display in ArcMap?

I have not come across *.ssf files before but I believe they are a Trimble GPS binary format. Someone has asked me if these files which he thinks have line/poly features can be imported for display ...
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12answers
20k views

Tablet or smart phone GPS vs “real” GPS

I've been reading a lot today about android and iphone devices being used for spatial data collection in the field and it sure seems to be that single purpose devices such as the extremely popular ...
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431 views

Matching GPS tracks

I'm looking for a proper way to process multiple GPS tracks (so time ordered list of lat/lon points) and match/classify that segments, that are covered by multiple tracks: So it's not about ...
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1answer
637 views

Replace Navteq maps by a free one in a car built-in GPS

My car (Opel Zafira) have a built-in GPS with Navteq maps (SD 900 NAVI). I wonder if it would be possible to update or upgrade the maps to an open source / free maps (like OSM). Or is it possible ...
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1answer
223 views

What format is this GPS tracking string?

I am receiving tracking data from a device and I am not sure what is the format/standard of this string in order to properly process the variables, this is a sample string received: ...
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38 views

Calculate Moving Time

I am wondering how web apps like Garmin connect or Strava calculate a "moving time" from a gps track. For example I might record a GPS track on my Garmin GPS that has an elapsed time of 5:34:26 but ...
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1answer
53 views

What is the best way to apply the correct ZIP Code when Geocoding

I need to batch geocode a set of addresses, some of them are missing the zip code causing the lat/lng to be placed incorrectly, is there a good way easily correct this? I am using a few geocoders, ...
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3answers
1k views

Local Coordinate to Geocentric

The ultimate question, I need a transformation matrix to take a point in local space representing a roughly 500m x 500m place in New Mexico centered at -108.619987456 long 36.234600064 lat. The final ...
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924 views

Register and display real time tracking of my smartphone (gps) on a map

I have 2 smartphones (android galaxy and iphone) and i would like to display the position, according to the gps coordinates, on a map. Is there any app to download or any kind of service where i ...
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4answers
724 views

GPS to map workflow, for non-GIS folk

What applications and workflow(s) do you use for gathering, displaying and storing GPS data, with your centralised corporate data, for people who are not GIS folk? We're in the process of ...
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2answers
339 views

Using handheld GPS for sub-meter precise positioning

I've heard that we could use two or more handheld GPS to get a better positioning accuracy using post processing techniques. Anybody can tell me the methodology? Also, can we program handheld GPS such ...
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looking for a GPS device which can transmit the location directly

I am looking for a GPS device or receiver that can transmit its own location to a specified configured server directly. there will be no medium like mobile phone or computer in between GPS and Server ...
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5answers
901 views

How can I find positions on my land?

I have about 2 acres of land, wooded and brushy. There was a survey and the corners have rebar. I am working on a site plan for house construction. I have two related problems: Finding a spot on ...
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2answers
79 views

How to choose spatial reference for GPS data?

We received GPs data from the vendor. I want using ArcGIS software to create XY event table and create a point feature class. What the spatial reference would be for the GPs data? Is it something I ...
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1answer
295 views

How to force ArcGIS iOS to use GPS data from External GPS device?

I created an app that will display the map and the location of the external GPS device. The scenario is using a wifly module to broadcast the GPS data of the GPS receiver in wifi. The app is now ...
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1answer
122 views

how to plot gps coordinates on my own raster map?

I have lat log values available in degree format, i donot know how to access raster maps using c#, and how to plot accurately. which libraries should i use and what are the controls avialable ,i am ...
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2answers
1k views

How to export and import gps points from Garmin 62S and QGIS

I'm pretty new to using QGIS and I'm curious about how to import and export GPS points created in QGIS. I have QGIS 2.0.1 dufour on windows XP and a Garmin 62s. Any suggested walk throughs would be ...
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1answer
898 views

How to convert from ITM ref to GPS ref ?

How can I convert from ITM ref (Israel new map) to GPS ref and from GPS ref to ITM ref? I need any C# sample code or formula for this. For example: 32.086156,34.769239 = 178364,665948 Or : ...
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57 views

Megellan Meridian and QGIS GPS Tools help request

I am using QGIS 2.0.1 on Ubuntu 12.04. I have a Magellan Meridian GPS and I trying to use the GPS Tools plugin to download waypoints to a layer in QGIS. I have successfully used the Gebabbel ...
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2answers
604 views

How can i convert from local coordinates to coordinates gps?

i don know if this is the right place to publish this. i am working with business object tool traying to make a kml file to be imported on google maps. I dont know much about geographic systems, but i ...
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1answer
2k views

Updating position for a list of markers

I am working with Google Maps. Specifically, I am working with http://hpneo.github.io/gmaps for a gps tracker simulation, here I need to update the position on each point. At the gmaps script, ...
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1answer
148 views

Is there any information in Sky Plot that is not in DOPs chart in terms of predicting accuracy in the field? (GPS data collection planning)

Joe only looks at DOPs chart and weather report for mission planning. Moe looks at both DOPs chart and Sky Plot and weather report. Is Joe missing out on something relative to Moe in terms of ...
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1answer
85 views

Open Source + Offline Geo Notebook

I am looking for an open source offline software to record points of interest that I might visit at a later date. Let's say I am reading a book about Alaska, I'd like to take notes about interesting ...
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61 views

snap GPS points to sidewalks

I have whole bunch of GPS coordinates collected from a device and sometimes they shift around 10m. Is there anyway to filter/modify points and snap them to sidewalks? So far I've written some ...
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43 views

How to merge intelligently GPS sensors?

I'm working on an application with a lot of GPS sensors, for each vehicle and person in a scene. I want to show a vehicle and his occupants in the same marker. But I can't get the vehicle occupants ...