first import

sites/all/modules/geocoder/plugins/geocoder_handler/exif.inc

@@ -0,0 +1,50 @@
+<?php
+
+$plugin = array(
+  'title' => t("Image/exif"),
+  'description' => t('Get a location from an image that was taken with a GPS enabled phone or camera'),
+  'callback' => 'geocoder_exif',
+  'field_types' => array('file', 'image'),
+  'field_callback' => 'geocoder_exif_field',
+);
+
+function geocoder_exif($url, $options = array()) {
+  // Invoke hook_file_download to check permissions
+  // We are essentially duplicating the logic found in file.inc file_download()
+  foreach (module_implements('file_download') as $module) {
+    $function = $module . '_file_download';
+    $result = $function($url);
+    if ($result == -1) {
+      drupal_set_message(t('You do not have permission to access this file'), 'error');
+      return FALSE;
+    }
+  }
+  
+  // The user has permission to access the file. Geocode it.
+  geophp_load();
+  if ($data = exif_read_data($url)) {
+    if (!isset($data['GPSLatitudeRef'])) return FALSE;
+    $lat = geocoder_exif_from($data['GPSLatitudeRef'], $data['GPSLatitude']);
+    $lon = geocoder_exif_from($data['GPSLongitudeRef'], $data['GPSLongitude']);
+    $point = new Point($lon, $lat);
+    return $point;
+  }
+  else return FALSE;
+}
+
+function geocoder_exif_field($field, $field_item) {
+  if ($field_item['fid']) {
+    $file = file_load($field_item['fid']);
+    return geocoder_exif($file->uri);
+  }
+}
+
+function geocoder_exif_from($dir, $data) {
+  foreach ($data as $k => $item) {
+    list($deg, $pct) = explode('/', $item);
+    if ($pct) $data[$k] = $deg / $pct;
+  }
+  $point = (float) $data[0] + ($data[1] / 60) + ($data[2] / 3600);
+  if (in_array($dir, array('S', 'W'))) $point = $point * -1;
+  return $point;
+}