How to find nearest unit to specific location

hhamedk, it is not very easy to make such tool.
Do You use some maps framework (OpenLayers, Leaflet)?

Very simple realization (without taking into account geofences, without routing and without dynamic update of units' positions) can be made in a few steps:
1. Catch double click event on map
2. Add marker to cursor's position
3. Using remote api request get all units whose last message time > now - some value (1 hour, 10 minutes or smth) in seconds.
For example such request:

https://hst-api.wialon.com/wialon/ajax.html?svc=core/search_items&params={"spec":{"itemsType":"avl_unit","propName":"rel_last_msg_date","propValueMask":">1465280000","sortType":"sys_name"},"force":1,"flags":0x00400401,"from":0,"to":0}&sid=sid

4. Calculate distances between marker's position and position of each unit.
5. Sort units by distance and return first 5 of them. It's 5 closest units to marker.

Example code for Openlayers 2.13 https://jsfiddle.net/wv4rgx0j/
(replace sid to Yours)

hhamedk, You want to get list of units that are near some coordinates over one request without using maps?
When You say location You mean address or coordinates.
What radius should be checked? Is unit's data actuality important?

There is no such remote api request for now.

But You can calculate closest unit to some coordinates yourself.
You need to calculate distance between Your coordinates and each unit.
And take smallest distance.
There is method wialon.util.Geometry.getDistance(lat1, lon1, lat2, lon2) in SDK JS.

If You can't use SDK JS there are a lot of realizations of such algorithm:
http://stackoverflow.com/questions/3658 … oordinates
And the simplest for small distances:
Math.sqrt((lat2 - lat1)*(lat2 - lat1) + (lon2 - lon1)*(lon2 - lon1)) * 111000.0;

hhamedk, You can use new SDK request getOneToManyRoute.
Example request:
wialon.util.Gis.getOneToManyRoute(55.59489584806276, 28.60730229579555, [{"lat":52.54072112733899,"lon":30.782595264242484}], function(){console.log(arguments);})
Example response: [{"status":"OK","distance":{"text":"426.33 km","value":426334.84},"duration":{"text":"5 h 19 min","value":19143}},{"status":"OK","distance":{"text":"21.83 km","value":21831.8},"duration":{"text":"19 min","value":1166}}]

florin1
Where did you get this values 100 km, 300 m, 20 km ? What request did you use?

Its pretty natural that you have to use raw value in meters for sorting. You can try to get raw data from response on convert it manually like this

function convert(val){
   val = val.split(' ');
   return val[0] * (val[1] == 'm' ? 1 : 1000);
}

florin1
First of all, don't use OpenLayers 2, its deeply outdated. If you're already using Google Maps - you can consider using Google Maps JS API Another variants are Leaflet or Openlayers 3

Most of map libraries have similar logic for it
- somehow get LatLng (in your case from Google place)
- create Marker with LatLng and add it to Map
- change map center with Map.setCenter(LatLng)

Here's useful link for you

PS please remember that we're discussing Wialon problems on this forum. All other problems can be solved with http://stackoverflow.com

deal wrote:

Would you please share document link of this API?

Hi,

I have found to get the Nearest vehicles list from a Location from Javascript : https://sdk.wialon.com/playground/demo/nearest_units

But client want to call a url from AJAX or API call and return the vehicle list in JSON format.

So, can you suggest Remote API sample or example to call from ajax or CURL method

Yes, We can not use JS sdk in all the cases.

Can you suggest how can I us existing Remote API methods to find the nearest vehicles list.
Requirement :
Step 1: Enter the Location/Lat or Langitude

Step 2 : Display all vehicles list with Distance from above location in KMs

deal, thanks a lot. We are wiating...do your best, please!

deal wrote:

It's like one year that we are waiting for a solution from your side! Please inform us about the result.

Hi GT

Please anyone help us to get nearest units list to one location via remote API!