[Geocoding] Help with student project about GPS-coordinates for windsurfers!

[Stefan Steiniger]

Hi Mats,

I will try to answer your questions - although they are a bit broad:

1. shortest distance (in the plane) between a point (surfer) and a line 
geometry (the coast) - packages like geos or jts can do this using their 
DistanceOp function. However, you would need to convert the GPS 
coordinate from WGS84 into a local coordinate system (such as UTM) to do 
this; assuming that your coast line is already in such a system.

2. this depends on your speed of movement and how abrupt you have 
changes in direction, which are important for you. To me 10secs sounds 
good. I have been looking at bus fleet data with 30sec/point and that 
isn't good enough from some applications. So, actually your application 
will define what resolution is best.

3. Probably using Leaflet (www.leafletjs.com) and displaying the GPS 
points from the surfer. Leaflet has quite a bit of tutorials. However 
this requires to have a webserver somewhere. You could probably also use 
a map service, such as Mapbox.com or Carto.com to display your data. But 
then you need to figure out how to get your live data into the platform.

so far my take,
Stefan

On 4/29/17 19:10, Mats Blakstad wrote:
> Hi
>
> I work on a student project in a course about Use Design at University 
> of Oslo. Our project is to help windsurfers; We try make a small 
> gadget that that they can bring (using Arduino) that will help them 
> (1) be alerted when they move too far from land, (2) be able to send a 
> SOS signal indicating their position if they need help, (3) give them 
> updated weather forecasts.
>
> None of us are very experienced with GeoCoding so hope someone here 
> can give use some small hints or point us in best correction;
>
>  1. What seem like the most reliable way to measure a persons distance
>     from land using a gps-coordinate?
>  2. How often should we save gps-coordinates to track a windsuring
>     trail with good enough resolution but still keep a minimum file
>     size of gps coordinates for trail?
>  3. What is the most simple way that we can create an online map with
>     trail from GPS-coordinates that we can update live?
>
> Thanks in advance for any help and feedbacks!
>
> Best regards
> Mats
>
>
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