Problem with robot_localization transforms

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Hey!

I am experimenting with robot_localization and amcl. I use a simulated turtlebot 3 which is in the /robot1/ namespace and has robot1_tf as tf-prefix.

I use a robot_localization ekf for the robot1_tf/odom frame and a separate one for the map. The problem here is that this map ekf always uses robot1_tf/map as map frame. But I need map as map-frame. I tried various combinations but that didn't change it.

My launch file looks like that:

<group ns=robot1">
    <param name="tf_prefix" value="robot1_tf" />

    <node pkg="robot_localization" type="ekf_localization_node" name="ekf_se_odom" clear_params="true">
          <rosparam command="load" file="$(find tb3_lidar_navigation)/params/odom_ekf.yaml" />
    </node>

    <node pkg="robot_localization" type="ekf_localization_node" name="ekf_se_map" clear_params="true">
      <remap from="odometry/filtered" to="odometry/filtered_map"/>
      <rosparam command="load" file="$(find tb3_lidar_navigation)/params/map_ekf.yaml" />
    </node>

    <!--- Run AMCL -->
    <include file="$(find tb3_lidar_navigation)/launch/amcl.launch.xml">
          <arg name="robot_ns"       value="$(arg robot_ns)"/>
          <arg name="robot_tf"       value="$(arg robot_tf)"/>
          <arg name="initial_pose_x" value="$(arg initial_pose_x)"/>
          <arg name="initial_pose_y" value="$(arg initial_pose_y)"/>
          <arg name="initial_pose_a" value="$(arg initial_pose_a)"/>
          <arg name="tf_broadcast"   value="false"/>
    </include>
  </group>

The config file for the map_ekf looks like that:

frequency: 30
sensor_timeout: 0.1
two_d_mode: true
transform_time_offset: 0.0
transform_timeout: 0.0
print_diagnostics: true
debug: false    

map_frame: map
odom_frame: odom
base_link_frame: base_footprint
world_frame: map

odom0: odom
odom0_config: [false, false, false,
               false, false, false,
               true,  true,  true,
               false, false, true,
               false, false, false]
odom0_queue_size: 10
odom0_nodelay: true
odom0_differential: false
odom0_relative: false

pose0: amcl_pose
pose0_config: [true,  true,  false,
               false, false, false,
               false, false, false,
               false, false, false,
               false, false, false]
pose0_queue_size: 10
pose0_nodelay: true
pose0_differential: false
pose0_relative: false

imu0: imu
imu0_config: [false, false, false,
              true,  true,  false,
              false, false, false,
              true,  true,  true,
              true,  true,  true]
imu0_nodelay: true
imu0_differential: false
imu0_relative: false
imu0_queue_size: 10
imu0_remove_gravitational_acceleration: true

use_control: false

Does anybody know how I can change the map frame? Thanks!