diff --git a/altiProfil/controllers/ajax.classic.php b/altiProfil/controllers/ajax.classic.php
index 85f9e73..a3f624f 100755
--- a/altiProfil/controllers/ajax.classic.php
+++ b/altiProfil/controllers/ajax.classic.php
@@ -69,11 +69,12 @@ public function getProfil(){
         $p2Lon = $this->param('p2Lon');
         $p2Lat = $this->param('p2Lat');
         $sampling = $this->param('sampling');
+        $distance = $this->param('distance');
 
         if ( ($this->checkParams($p1Lon, $p1Lat)) and ($this->checkParams($p2Lon, $p2Lat)) ){
             if($altiProvider == 'ign' ){
                 $altiProviderInstance = new \AltiProfil\AltiServicesFromIGN($altiConfig);
-                $rep->data = $altiProviderInstance->getProfil($p1Lon, $p1Lat, $p2Lon, $p2Lat, $sampling);
+                $rep->data = $altiProviderInstance->getProfil($p1Lon, $p1Lat, $p2Lon, $p2Lat, $sampling, $distance);
                 return $rep;
             }elseif ( $altiProvider == 'database' ) {
                 $repository = $this->param('repository');
diff --git a/altiProfil/install/www/altiprofil/js/altiProfil.js b/altiProfil/install/www/altiprofil/js/altiProfil.js
index 6447fe3..92f8eaa 100755
--- a/altiProfil/install/www/altiprofil/js/altiProfil.js
+++ b/altiProfil/install/www/altiprofil/js/altiProfil.js
@@ -86,7 +86,8 @@ function getProfil(p1,p2){
         'srs': lizMap.map.projection.projCode,
         'repository': lizUrls.params.repository,
         'project': lizUrls.params.project,
-        'sampling' : Math.round(p1.distanceTo(p2))/2 /* Only use with french mapping Agency (IGN) web service  */
+        'sampling' : Math.round(p1.distanceTo(p2)/25) /* Only use with french mapping Agency (IGN) web service  */,
+        'distance' : Math.round(p1.distanceTo(p2))
     }
 
     getProfilJsonResponse(qParams, function(data){
diff --git a/altiProfil/lib/AltiServicesFromIGN.php b/altiProfil/lib/AltiServicesFromIGN.php
index 5288a52..0c97441 100755
--- a/altiProfil/lib/AltiServicesFromIGN.php
+++ b/altiProfil/lib/AltiServicesFromIGN.php
@@ -58,13 +58,15 @@ public function getAlti($lon, $lat)
     /**
      * Get profil from IGN API
     **/
-    public function getProfil($p1Lon, $p1Lat, $p2Lon, $p2Lat, $sampling)
+    public function getProfil($p1Lon, $p1Lat, $p2Lon, $p2Lat, $sampling, $distance)
     {
+        // 150 is the max allowed for a fast response by IGN
+        $sampling = min(150, $sampling);
         $APIRestProfil = "/alti/rest/elevationLine.json";
         $data = array(
             'lon' => $p1Lon."|".$p2Lon,
             'lat' => $p1Lat."|".$p2Lat,
-            'sampling' => 10,
+            'sampling' => $sampling,
             'resource' => $this->resource_id
         );
 
@@ -146,10 +148,11 @@ public function getProfil($p1Lon, $p1Lat, $p2Lon, $p2Lat, $sampling)
             $customdata = array();
             $resolution = "";
             $i=0;
+            $distanceStep  = ($distance/$sampling);
             foreach($ignProfilResponse->elevations as $key => $value) {
-                    $x[] = $i;
+                    $x[] = $i*$distanceStep;
                     $y[] = $value->z;
-                    $customdata[] = [$value->lon, $value->lat];
+                    $customdata[] = [["lon" => $value->lon, "lat" => $value->lat]];
                     $i = $i+1;
             }
             $data = [ [