diff --git a/data_handler/utils/create_camera_update_statements.php b/data_handler/utils/create_camera_update_statements.php
new file mode 100755
index 0000000..c3d056f
--- /dev/null
+++ b/data_handler/utils/create_camera_update_statements.php
@@ -0,0 +1,309 @@
+<?php
+
+include "config.php";
+
+$elementTypes = array();
+$count = 0;
+$countDelete = 0;
+$countModifyDelete = 0;
+$countModify = 0;
+$countCreate = 0;
+$mode = '';
+$curNodeAttrs = null;
+$curNodeTags = null;
+$id = 0;
+$latitude = 0;
+$longitude = 0;
+
+$sql_statement = "BEGIN TRANSACTION;\n";
+
+$mysqli = new mysqli(MYSQL_HOST, MYSQL_USER, MYSQL_PASSWORD, MYSQL_DB);
+
+if($mysqli->connect_errno) {
+  echo "Error while connecting to DB : $mysqli->error \n" ;
+  exit(1);
+}
+$mysqli->autocommit(FALSE);
+
+if (! ($deleteStmt = $mysqli->prepare("DELETE FROM position WHERE id=?"))) {
+  echo "Error while preparing delete position statement : " . $mysqli->error ;
+  exit(1);
+}
+$deleteStmt->bind_param('d', $id);
+
+if (! ($deleteTagStmt = $mysqli->prepare("DELETE FROM tag WHERE id=?"))) {
+  echo "Error while preparing delete tag statement : " . $mysqli->error ;
+  exit(1);
+}
+$deleteTagStmt->bind_param('d', $id);
+
+if (USE_STATISTICS) {
+  if (! ($deleteStatsStmt = $mysqli->prepare("DELETE FROM statistics WHERE id=?"))) {
+    echo "Error while preparing delete statistics statement : " . $mysqli->error ;
+    exit(1);
+  }
+  $deleteStatsStmt->bind_param('d', $id);
+}
+
+if (! ($insertStmt = $mysqli->prepare("INSERT INTO position (id, latitude, longitude) VALUES (?, ?, ?)"))) {
+  echo "Error while preparing insert position statement : " . $mysqli->error ;
+  exit(1);
+}
+$insertStmt->bind_param('dii', $id, $latitude, $longitude);
+
+if (! ($insertTagStmt = $mysqli->prepare("INSERT INTO tag (id, k, v) VALUES (?, ?, ?)"))) {
+  echo "Error while preparing insert tag statement : " . $mysqli->error ;
+  exit(1);
+}
+$insertTagStmt->bind_param('dss', $id, $k, $v);
+
+if (USE_STATISTICS) {
+  if (! ($insertStatsStmt = $mysqli->prepare("INSERT INTO statistics (id, ts, version) VALUES (?, ?, ?)"))) {
+    echo "Error while preparing insert statistics statement : " . $mysqli->error ;
+    exit(1);
+  }
+  $insertStatsStmt->bind_param('dsi', $id, $ts, $version);
+}
+
+function printDebug() {
+  global $elementTypes, $count, $countDelete, $countModifyDelete, $countModify, $countCreate;
+
+  echo "== $count ==============================\n";
+  foreach($elementTypes as $k => $v) {
+    echo "$k : $v\n";
+  }
+  echo "++++++ Surveillance nodes : ++++++\n";
+  echo "$countDelete deletions\n";
+  echo "$countModifyDelete modifications --> deletions\n";
+  echo "$countModify modifications\n";
+  echo "$countCreate creations\n";
+}
+
+function printDebugCurNode() {
+  global $curNodeAttrs, $curNodeTags, $mode;
+
+  echo "=============\n";
+  echo "$mode : " . $curNodeAttrs['id'] ." (". $curNodeAttrs['lat'] . " x " . $curNodeAttrs['lon'] . ") :  " . $curNodeAttrs['user'] . "\n";
+  if (! empty($curNodeAttrs)) {
+    echo "  => Attributes :\n";
+    foreach($curNodeAttrs as $k => $v) {
+      echo "   $k : $v\n";
+    }
+  } else {
+     echo "  => No attributes\n";
+  }
+  if (! empty($curNodeTags)) {
+    echo "  => Tags :\n";
+    foreach($curNodeTags as $k => $v) {
+      echo "   $k : $v\n";
+    }
+  } else {
+     echo "  => No tags\n";
+  }
+}
+
+function startElement ($parser, $name, $attrs) {
+  global $elementTypes, $count, $mode, $curNodeAttrs, $curNodeTags;
+  $count++;
+
+  if (array_key_exists($name, $elementTypes)) {
+    $elementTypes[$name] += 1;
+  } else {
+    $elementTypes[$name] = 1;
+  }
+
+  if ($name == 'modify' || $name == 'delete' or $name == 'create') {
+    $mode = $name;
+
+  } else if ($name == 'node') {
+    $curNodeAttrs = $attrs;
+    $curNodeTags = array();
+
+  } else if ($name == 'tag') {
+    $curNodeTags[$attrs['k']] = $attrs['v'];
+  }
+}
+
+function endElement ($parser, $name) {
+  if (USE_STATISTICS) {
+    global $mode, $deleteStmt, $deleteTagStmt, $deleteStatsStmt, $insertStmt, $insertTagStmt, $insertStatsStmt, $selectStmt, $id, $latitude, $longitude, $k, $v, $ts, $version, $curNodeAttrs, $curNodeTags, $mysqli, $countDelete, $countModifyDelete, $countModify, $countCreate, $sql_statement;
+  } else {
+    global $mode, $deleteStmt, $deleteTagStmt, $insertStmt, $insertTagStmt, $selectStmt, $id, $latitude, $longitude, $k, $v, $curNodeAttrs, $curNodeTags, $mysqli, $countDelete, $countModifyDelete, $countModify, $countCreate, $sql_statement;
+  }
+
+  if ($name == 'modify' || $name == 'delete' or $name == 'create') {
+    $mode = '';
+  } else if ($name == 'node') {
+    if ($mode == 'delete') {
+      $id = $curNodeAttrs['id'];
+
+      if (USE_STATISTICS) {
+        if (! $deleteStatsStmt->execute()) {
+          echo "***** Error : Deleting statistics $id : ". $deleteStatsStmt->error . "\n";
+        }
+      }
+
+      if (! $deleteTagStmt->execute()) {
+        echo "***** Error : Deleting tags $id : ". $deleteTagStmt->error . "\n";
+      }
+      
+      if (! $deleteStmt->execute()) {
+        echo "***** Error : Deleting $id : ". $deleteStmt->error . "\n";
+      }
+      if ($deleteStmt->affected_rows > 0) {
+        $sql_statement = $sql_statement . "DELETE FROM position WHERE id=$id;\n";
+        $sql_statement = $sql_statement . "DELETE FROM tag WHERE id=$id;\n";
+        $countDelete++;
+        $mysqli->commit();
+        printDebugCurNode();
+      }
+
+    } else if ($mode == 'modify' || $mode == 'create') {
+      if (! empty($curNodeTags)
+          && array_key_exists('man_made', $curNodeTags)
+          && $curNodeTags['man_made'] == 'surveillance') {
+
+        printDebugCurNode();
+
+        $id = $curNodeAttrs['id'];
+
+        if ($mode == 'modify') {
+          $countModify++;
+
+          if (USE_STATISTICS) {
+            if (! $deleteStatsStmt->execute()) {
+              echo "***** Error : Deleting statistics $id for modification : ". $deleteStatsStmt->error . "\n";
+            }
+          }
+
+          if (! $deleteTagStmt->execute()) {
+            echo "***** Error : Deleting tags $id for modification : ". $deleteTagStmt->error . "\n";
+          }
+          if (! $deleteStmt->execute()) {
+            echo "***** Error : Deleting $id for modification : ". $deleteStmt->error . "\n";
+          }
+        } else {
+          $countCreate++;
+        }
+
+        $latitude = (int) ($curNodeAttrs['lat'] * 10000000);
+        $longitude = (int) ($curNodeAttrs['lon'] * 10000000);
+        $sql_statement = $sql_statement . "INSERT INTO position (id, latitude, longitude) VALUES ($id, $latitude , $longitude);\n";
+        if (! $insertStmt->execute()) {
+          echo "***** Error : inserting $id ($latitude x $longitude) : ". $insertStmt->error . "\n";
+        }
+
+        $k = 'lat';
+        $v = $curNodeAttrs['lat'];
+        $sql_statement = $sql_statement . "INSERT INTO tag (id, k, v) VALUES ($id, '$k', '$v');\n";
+        if (! $insertTagStmt->execute()) {
+          echo "***** Error : inserting latitude $v for $id : ". $insertTagStmt->error . "\n";
+        }
+
+        $k = 'lon';
+        $v = $curNodeAttrs['lon'];
+        $sql_statement = $sql_statement . "INSERT INTO tag (id, k, v) VALUES ($id, '$k', '$v');\n";
+        if (! $insertTagStmt->execute()) {
+          echo "***** Error : inserting longitude $v for $id : ". $insertTagStmt->error . "\n";
+        }
+
+        $k = 'userid';
+        $v = $curNodeAttrs['user'];
+        $sql_statement = $sql_statement . "INSERT INTO tag (id, k, v) VALUES ($id, '$k', '$v');\n";
+
+        if (! $insertTagStmt->execute()) {
+          echo "***** Error : inserting user $v for $id : ". $insertTagStmt->error . "\n";
+        }
+
+        $k = 'version';
+        $v = $curNodeAttrs['version'];
+        $sql_statement = $sql_statement . "INSERT INTO tag (id, k, v) VALUES ($id, '$k', '$v');\n";
+        if (! $insertTagStmt->execute()) {
+          echo "***** Error : inserting version $v for $id : ". $insertTagStmt->error . "\n";
+        }
+
+        $k = 'timestamp';
+        $v = $curNodeAttrs['timestamp'];
+        $sql_statement = $sql_statement . "INSERT INTO tag (id, k, v) VALUES ($id, '$k', '$v');\n";
+        if (! $insertTagStmt->execute()) {
+          echo "***** Error : inserting timestamp $v for $id : ". $insertTagStmt->error . "\n";
+        }
+
+        foreach($curNodeTags as $k => $v) {
+        $sql_statement = $sql_statement . "INSERT INTO tag (id, k, v) VALUES ($id, '$k', '$v');\n";
+          if (! $insertTagStmt->execute()) {
+            echo "***** Error : inserting tag $k => $v for $id : ". $insertTagStmt->error . "\n";
+          }
+        }
+
+        if (USE_STATISTICS) {
+          $ts = $curNodeAttrs['timestamp'];
+          $version = $curNodeAttrs['version'];
+          if (! $insertStatsStmt->execute()) {
+            echo "***** Error : inserting ts $ts, version $version for $id : ". $insertStatsStmt->error . "\n";
+          }
+        }
+
+        $mysqli->commit();
+      } else if ($mode == 'modify') {
+        // delete former surveillance nodes that were modified to non-surveillance nodes
+        $id = $curNodeAttrs['id'];
+
+        if (USE_STATISTICS) {
+          if (! $deleteStatsStmt->execute()) {
+            echo "***** Error : Deleting statistics $id for non-surveillance node : ". $deleteStatsStmt->error . "\n";
+          }
+        }
+        if (! $deleteTagStmt->execute()) {
+          echo "***** Error : Deleting tags $id for non-surveillance node : ". $deleteTagStmt->error . "\n";
+        }
+        if (! $deleteStmt->execute()) {
+          echo "***** Error : Deleting $id for non-surveillance node : ". $deleteStmt->error . "\n";
+        }
+
+        if ($deleteStmt->affected_rows > 0) {
+          $sql_statement = $sql_statement . "DELETE FROM position WHERE id=$id;\n";
+          $sql_statement = $sql_statement . "DELETE FROM tag WHERE id=$id;\n";
+          $countModifyDelete++;
+          $mysqli->commit();
+          printDebugCurNode();
+          echo "  ==> delete because modified to non-surveillance node\n";
+        }
+      }
+    }
+
+    $curNodeAttrs = null;
+    $curNodeTags = null;
+  }
+}
+
+$file="change_file.osc";
+
+$xml_parser = xml_parser_create();
+xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, false);
+xml_set_element_handler($xml_parser, "startElement", "endElement");
+
+if (!($fp = fopen($file, "r"))) {
+  die("could not open XML input");
+}
+
+while ($data = fread($fp, 4096)) {
+  if (!xml_parse($xml_parser, $data, feof($fp))) {
+    die(sprintf("XML error: %s at line %d",
+                xml_error_string(xml_get_error_code($xml_parser)),
+                xml_get_current_line_number($xml_parser)));
+  }
+}
+
+$sql="UPDATE sync_state SET v='" . $_SERVER['argv'][1] ."' WHERE k='sequenceNumber';";
+$mysqli->query($sql);
+$mysqli->commit();
+$sql_statement = $sql_statement . "UPDATE sync_state SET v='" . $_SERVER['argv'][1] ."' WHERE k='sequenceNumber';\n";
+$sql_statement = $sql_statement . "COMMIT;";
+$sql_file = "/migrations/".$_SERVER['argv'][1].".sql";
+
+file_put_contents($sql_file, $sql_statement);
+printDebug();
+$mysqli->close();
+
+?>
diff --git a/data_handler/utils/create_camera_update_statements.sh b/data_handler/utils/create_camera_update_statements.sh
new file mode 100644
index 0000000..a9fa465
--- /dev/null
+++ b/data_handler/utils/create_camera_update_statements.sh
@@ -0,0 +1,93 @@
+#!/bin/bash
+
+exedir=$(cd `dirname "$0"`; pwd)
+
+REPLICATE_URL=`grep "REPLICATE_URL" "$exedir/config.php"  | sed -e 's/.*http/http/' -e 's#...$##' `
+
+if [ -e "/var/lock/update_camera" ]
+then
+  # Maybe an other update is running
+  otherPid=$(cat "/var/lock/update_camera")
+  count=$(ps $otherPid | grep -c `basename "$0"`)
+
+  if [ $count -gt 0 ]
+  then
+    echo "$0 is running yet. Exiting." >&2
+    exit 1
+  fi
+fi
+
+# OK. We can update the database...
+echo $$ >  "/var/lock/update_camera"
+
+exeDir=$(cd `dirname "$0"`; pwd);
+cd "$exeDir"
+
+if [ -e "state.txt" ]
+then
+  rm "state.txt"
+fi
+
+#TODO get state from db
+# Read the last update timestamp
+# lastTimestamp=$(grep "^timestamp=" "lastState.txt" | cut -d'=' -f2-)
+# lastSeqNum=$(grep "^sequenceNumber=" "lastState.txt" | cut -d'=' -f2-)
+
+lastSeqNum=$(php get_sync_state.php)
+
+curl -L "$REPLICATE_URL/state.txt" -o state.txt 
+
+newTimestamp=$(grep "^timestamp=" "state.txt" | cut -d'=' -f2-)
+newSeqNum=$(grep "^sequenceNumber=" "state.txt" | cut -d'=' -f2-)
+
+if [ $newSeqNum -eq $lastSeqNum ]
+then
+  echo "No new file to be processed"
+  exit 1
+fi
+mkdir logs
+curSeqNum=$lastSeqNum
+while [ $curSeqNum -lt $newSeqNum ]
+do
+  curSeqNum=$(( $curSeqNum + 1 ))
+
+  logFileName="logs/log.$curSeqNum"
+
+  if [ -e "change_file.osc" ]
+  then
+    rm "change_file.osc"
+  fi
+
+  if [ -e "change_file.osc.gz" ]
+  then
+    rm "change_file.osc.gz"
+  fi
+
+  echo `date "+%d/%m/%Y %H:%M"`" - Start processing sequence number $curSeqNum" > "$logFileName"
+
+  targetDirName=`echo "000000000$curSeqNum" | sed 's#.*\(...\)\(...\)\(...\)$#\1/\2/\3.osc.gz#'`
+  targetDirName="$REPLICATE_URL/$targetDirName"
+
+  curl -L "$targetDirName" -o change_file.osc.gz 2>&1 | tee -a $logFileName
+  if [ $? -gt 0 ]
+  then
+    echo "Error during recovery of $targetDirName" | tee -a $logFileName
+    exit 1
+  fi
+
+  gunzip change_file.osc.gz 2>&1 | tee -a $logFileName
+  if [ $? -gt 0 ]
+  then
+    echo "Error during decompression of $targetDirName" | tee -a $logFileName
+    exit 1
+  fi
+
+  php create_camera_update_statements.php $curSeqNum 2>&1 | tee -a $logFileName
+
+  targetDirName=`echo "$targetDirName" | sed 's/.osc.gz$/.state.txt/'`
+
+  curl -L "$targetDirName" -o lastState.txt 2>&1 | tee -a $logFileName
+  echo `date "+%d/%m/%Y %H:%M"`" - Finish processing sequence number $curSeqNum" | tee -a "$logFileName"
+done
+
+rm "/var/lock/update_camera"