Drupal Migration example class of geofield fields.

HotelMigration.inc

<?php

class HotelMigration extends Migration {

  public function __construct(array $arguments) {
    parent::__construct($arguments);
    $this->description = t('Import of hotels');

    $columns = array(
      0 => array('StreetId', 'StreetId'),
      1 => array('StreetName', 'StreetName'),
      2 => array('PostAddressId', 'PostAddressId'),
      4 => array('Area', 'Area'),
      6 => array('ZoneNo', 'ZoneNo'),
      11 => array('Longitude', 'Longitude'),
      12 => array('Latitude', 'Latitude'),
    );

    $this->source = new MigrateSourceCSV(drupal_realpath('public://') . '/migrate/hotell_sorensen.csv', $columns, array(
      'delimiter' => ',',
      'header_rows' => 1
    ));
    $this->destination = new MigrateDestinationNode('hotel');

    $this->map = new MigrateSQLMap(
      $this->machineName,
      array(
        'StreetId' => array(
          'type' => 'int',
          'unsigned' => TRUE,
          'not null' => TRUE,
        )
      ),
      MigrateDestinationNode::getKeySchema()
    );

    $this->addFieldMapping('title', 'StreetName');
    $this->addFieldMapping('field_street_id', 'StreetId');
    $this->addFieldMapping('field_address')->defaultValue('NO');
    $this->addFieldMapping('field_address:thoroughfare', 'Area');
    $this->addFieldMapping('field_address:postal_code', 'PostAddressId');
    $this->addFieldMapping('field_address:locality')->defaultValue('Tromsø');
    $this->addFieldMapping('field_zone_no', 'ZoneNo');
    $this->addFieldMapping('field_geofield')->defaultValue('Point');
    $this->addFieldMapping('field_geofield:input_format')->defaultValue('lat/lon');
    $this->addFieldMapping('field_geofield:geo_type')->defaultValue('point');
    $this->addFieldMapping('field_geofield:lat', 'Latitude');
    $this->addFieldMapping('field_geofield:lon', 'Longitude');
  }

  public function prepareRow($row) {
    $row->Longitude = $row->Longitude / 100000;
    $row->Latitude = $row->Latitude / 100000;
  }

}