Plotting a ship's movement from GPS co-ordinates

Programming Questions

joannasau..

Plotting a ship's movement from GPS co-ordinates

in Programming Questions • 2 years ago

Hello all,

I'm fairly new to the Processing world and am currently working on a personal project. What I'm trying to do is continually plot the journey of a ship on a map... so I just get one continual line of everywhere it's been/goes.

The ship and its location are here - http://aprs.fi/?call=309742000&mt=roadmap&z=11&timerange=3600

After much agro I've FINALLY got the lat/long of some capital cities landing in the correct spot on a map, so I know that side of things is all okay. What I'm really wondering is: can this actually be done?! Is it possible to pull the GPS co-ordinates from that website, read them into processing, and get it to draw a continual line?

Any thoughts/tips/resources would be much appreciated :)

Replies(2)

Jesse Sco..

Re: Plotting a ship's movement from GPS co-ordinates

2 years ago

Yes, this can be done... I think. I'm sure it can.

One question - is it a two-dimensional map?

Can you show some of the code you are using ?

joannasau..

Re: Plotting a ship's movement from GPS co-ordinates

2 years ago

Hi Jesse,

Thanks for the reply :) I'm currently using some code I found in a topic on this forum...

// Tracking the MV Aberdeen

// Code from Processing Forum

PImage backgroundMap;

float mapGeoLeft = -125.22; // Longitude 125 degrees west

float mapGeoRight = 153.44; // Longitude 153 degrees east

float mapGeoTop = 71.89; // Latitude 72 degrees north.

float mapGeoBottom = -56.11; // Latitude 56 degrees south.

float mapScreenWidth,mapScreenHeight; // Dimension of map

void setup()

{

size(600,350);

smooth();

noLoop();

backgroundMap = loadImage("world.jpg"); //Background

mapScreenWidth = width;

mapScreenHeight = height;

}

void draw()

{

image(backgroundMap,0,0,mapScreenWidth,mapScreenHeight);

fill(216,39,196);

strokeWeight(0.01);

PVector p = geoToPixel(new PVector(0.8,51.5)); // London

ellipse(p.x,p.y,5,5);

p = geoToPixel(new PVector(-73.9,40.8)); // New York

ellipse(p.x,p.y,5,5);

p = geoToPixel(new PVector(139.8,35.7)); // Tokyo

ellipse(p.x,p.y,5,5);

p = geoToPixel(new PVector(151.0,-34.0)); // Sydney

ellipse(p.x,p.y,5,5);

}

// Converts geographical coordinates into screen coordinates.

// Useful for drawing geographically referenced items on screen.

// Worth using??

public PVector geoToPixel(PVector geoLocation)

{

return new PVector(mapScreenWidth*(geoLocation.x-mapGeoLeft)/(mapGeoRight-mapGeoLeft),

mapScreenHeight - mapScreenHeight*(geoLocation.y-mapGeoBottom)/(mapGeoTop-mapGeoBottom));

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