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Questions tagged [trajectory]

An ordered collection of x,y,time coordinates.

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1answer
47 views

Plot trajectory in R

Does anyone knows a library/technique in R where you can plot a trajectory using multiple timesteps (points) where each point does have a lat/lon coordinate? I have this data x <- read.table("...
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0answers
14 views

Stop detection on a dataset of (id,geometry points,timestamp) to be transformed into meaningful trajectories

My pretty large dataset consists of AIS transmitted messages. I load the dataset to a table in my db. Among other columns in this table, there are a longitude and a latitude column. I already ...
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2answers
53 views

Converting trajectory to outer edges polygon

Using PostGIS, I'm trying to solve the following problem: I have trajectory data (coordinates from API query), like on this image: and want to convert it into polygon, having only outer edges:
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0answers
79 views

Trajectory similarity: calculate distance between two trajectories [closed]

I have two sets of coordinates. And I'd like to calculate the distance between two trajectories by Python. Especially, I'd like to get the point which is the most distant. How can I calculate ? Or ...
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0answers
124 views

Intersect a linestring with a collection of polygons in Shapely

I have a LineString that represents a trajectory and a Python list of Polygons that represent crossroads. I would like to insert new points into the LineString wherever it crosses any of the polygons, ...
1
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1answer
747 views

How do I convert points to line in QGIS 3?

I have a dataset of gps points with DateTime and id field and I would like to create a line vector so that I can use this vector for interpolation on a raster. My goal is to find the mean of the ...
1
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1answer
40 views

User tracking on a defined route

I am having a vehicle route with a set of latitude and longitude values. User need travel on the specified route, If user deviates from the route (Grater than 100 meters), we need to identify in which ...
1
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0answers
60 views

Linear referencing route events for trajectory data

I am trying to show route events for depths with trajectory data. The depth data has both positive and negative values (starts 50m above sea level and ends km's below the sea level). The below process ...
3
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1answer
154 views

Documentation on the format of a Leica SOL file

I have a file in Leica's SOL Sensor Trajectory Format (the filename has the pattern yyyymmdd_HHMMSS.sol) which I'd like to read. Can anyone point me to documentation on the format? Supposedly it ...
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0answers
230 views

Identifying activity places in GPS trajectories using R?

Is there a way in R (a script or package) that would allow identifying activity spots in GPS tracking data? I have a number of GPS tracks in GPX/CSV formats that follow the movements of people in a ...
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2answers
490 views

Interactive shapefile based map

I'm developing an interactive web-based navigation application which user can search locations and navigate from point A to point B by an online map. The routing algorithm (find shortest trajectory ...
23
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2answers
596 views

Seeking Algorithm to detect circling and beginning and end of circle?

I've got lots of flight data from glider pilots in the form of gps fixes in a fixed interval. I would like to analyze the flight path and detect the start and the end of the 'circling' the glider ...
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0answers
79 views

Intersection of 4D Trajectory with 4D Polyeder (3D + time)

I have worldwide small polygons (lat/lon WGS84) for different heights (z-coordinate) for several timestamps (m). I want to store them in a PostgreSQL/PostGIS database as 4D objects (2D polygons + ...
2
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1answer
51 views

Calculating standing times

I have n objects and each object has m positions. Every position is defined by x, y (in millimeters) and a (unix) timestamp. { objId: 'a-b-c', x: 123, y: 567, date: 123456789, } Now I want ...
6
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1answer
235 views

3D time dimension (x,y,t) [closed]

I'm working with data points (x,y) and timestamp t as a separate attribute in my table. (x, y) are in WGS 84 latitude,longitude format while timestamp is in Unix Time. For instance (71.8, -13.5) and ...
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0answers
260 views

Path Matching for Journeys Using XY Coordinates [closed]

I am trying to find some suggestions on ways or algorithms to determine path similarity. An illustration of 3 paths using made up data is given below. The title should be finding similar paths instead ...
4
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2answers
64 views

How to find fluctuant parts in a trajectory

I am currently doing an assignment on how to compress a trajectory. Given a trajectory T1 in figure 1, and I want to get a compressed version as T2. For segments p0~p3 and p6~p9 in T2, I can obtain ...
3
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1answer
2k views

Open a SBET file format in GIS software

After a LiDAR flight, we can get a file containing the airplane trajectory in SBET format - Smoothed Best Estimate of Trajectory. Is it possible to open it in a GIS software like QGIS or ArcGIS? If ...
4
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2answers
783 views

Road segments reconstruction from GPS trajectories [duplicate]

We have a 10,000 base of vehicle mounted moving devices which report their GPS position on a time based schedule. All that data is currently being stored in our database for several business related ...
4
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1answer
579 views

How to generate missing points in GPS trajectories?

I have some GPS trajectories that include gps locations recorded on variable frequencies (every 1 min ,5 min , 20 min,etc.)using a geographic projection WGS84. In my work, i need a fine-grained GPS ...
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0answers
168 views

How to get speed and acceleration from trajectory data?

I am using Java and netbeans as a IDE to develop a project. I have got some trajectory data by applying a spatial query. My question is, how can I get speed and acceleration for these trajectory data? ...
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0answers
123 views

Trajectory / ballistics

I'm trying to calculate if a canon will be able to shoot over a height in the terrain. lets saytThe canon have to be 15'000-18'000m from the target, and the impact degrees have to be over 30 degrees....
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0answers
15 views

Track Traffic Display in World Wind [duplicate]

Is it possible to play records which has trajectories and time stamps as live traffics. I did investigate the World Wind SDK but I can not see special classes for aviation or Tracks and trajectory ...
4
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1answer
1k views

Longest Common Subsequence for trajectory matching in Python

Is there any fast implementation of the Longest Common Subsequence algorithm for trajectory matching in Python? Ideally it would work with trajectories of different length in 2d spaces.
2
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1answer
2k views

How to plot trajectory points on maps in python

When I read the paper Characterizing Urban Landscapes using Geolocated Tweets, I'm attracted by the figures illustrated in it, like this: And I want to know how to plot these figures for my own data?(...
7
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5answers
4k 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 recording,...
3
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0answers
349 views

Trajectory Indexing: How could I store and index the large trajectory dataset generated by cars' GPS? [closed]

I have a large trajectory dataset generated by cars' GPS. Since I will do some data mining work on them, I need an efficient way to store and index them. I read some papers about Trajectory Indexing (...
2
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1answer
1k views

Reading SBET file in python?

I have an SBET (Smoothed Best Estimate of Trajectory) file that I would like to read in python. I found these links that discuss options for reading/writing SBET files, but I was wondering if our ...
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0answers
209 views

Literature on the appoximation of trajectory points with (smooth) curves

We are gathering trajectories of GPS points of moving objects (cars, bikes, etc.) and would like to compute approximate curves (that may self-intersect) that would represent those clouds of points. ...
3
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1answer
2k views

WMS Geoserver layer over OSM

I have a Geoserver with a layer in a EPSG:32632 projection. I want to display this layer over Open Street Map tiles. When I use the following html code: <!DOCTYPE html> <html> <head&...
17
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2answers
3k views

How to best model GPS tracks for storage, visualization and analysis?

I am thinking about writing software to deal with GPS Tracks and Waypoints (mostly storing, displaying and calculating metrics such as speed, grade, and some simple statistics). I wonder what should ...
1
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0answers
852 views

Algorithm to match trajectory [closed]

I've data in the format (lattitude,longitude,timestamp). What I want to do is between timestamp1 and timestamp2 I want to find out which people might have taken the same routes. Is there some kind of ...
1
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1answer
2k views

From trajectory of GPS points to multiline segment?

Given a trajectory as a sequence of GPS points I would like to create a smooth linestring representing a path where a car drove. The data is stored in postgresql: the input trajectory in a table, ...
4
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1answer
1k views

Using PostGIS for a large trajectory dataset

I have a spatial trajectory dataset which basically contains about 10E6 (lat,lon,time)-tuples, grouped together by an identifier so they form trajectories. Currently, SQLite is used to store the raw ...
29
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8answers
14k views

Creating polyline-based “heatmap” from GPS tracks?

This winter I am planning to track my downhill skiing/snowboarding using a GPS. Most of my riding will occur at the same resort. I would like to be able to create a sort of "heatmap" that shows the ...
3
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2answers
301 views

Converting lat lon into co-ordinates (in ft of m)

I have a set of latitude and longitude of a series of points which specific the trajectory of a vehicle. If I consider the first point as the origin (0,0), is it possible to convert the trajectory ...
2
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2answers
2k views

Making line from set of GPS points using ArcGIS for Desktop?

I need to create the trajectory of respondents according to the their collected GPS data (including X and Y). I am familiar with python programming, but I am a beginner in ArcGIS. I want to write ...
10
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1answer
1k views

Looking for a trajectory similarity measure

For my final academic work I have developed a compression algorithm for GPS trajectories. I can estimate the quality of the spatio-temporal compression by computing the syncronized euclidean distance (...
2
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0answers
139 views

How to reduce trajectories with Bellman algorithm?

I need an algorithm to reduce trajectories with Bellman algorithm. I haven't found anything searching in Google. Can someone help me? It would be cool have it in MATLAB.
3
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0answers
144 views

Classify trajectory compression algorithm

I'm tryng to classify each compression algorithm based upon their features, i've thinked: Compression algorithm Lossless algorithm Batched algorithm Rinex Lossy algorithm Batched algorithm ...
3
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2answers
407 views

Repository for GPS tracklog (better gpx format)

I've developed some algorithms that work with GPS trajectories. So I need a repository in which I can download GPS trajecotries to run my test. I most need marine and air tajectories, better if ...
6
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1answer
259 views

Predict user's future location - location awareness mobile computing

This question is a part of an online course (Mobility Data Management) that I am currently auditing. A part of the project is to implement a system that can predict user's future location. This kind ...