Ground plane texture image

edit

I want to get a ground plane with a dimension of 11.03x5.66m. For this I have a texture image with the size of 1103x566px (same size but 1px = 1cm)

I followed the instructions posted in here: http://answers.gazebosim.org/question/4761/how-to-build-a-world-with-real-image-as-ground/

So I have the following files:

./materials/scripts/floor_walls_1.material
./materials/textures/floor.png
./model.config
./model.sdf

model.sdf

<?xml version="1.0"?>
<sdf version="1.4">
<model name="floor_walls_1">
  <static>true</static>
    <link name="link">
      <collision name="collision">
        <geometry>
          <plane>
            <normal>0 0 1</normal>
            <size>11.03 5.66</size>
          </plane>
        </geometry>
        <surface>
          <friction>
            <ode>
              <mu>100</mu>
              <mu2>50</mu2>
            </ode>
          </friction>
        </surface>
      </collision>
      <visual name="visual">
        <cast_shadows>false</cast_shadows>
        <geometry>
          <plane>
            <normal>0 0 1</normal>
            <size>11.03 5.66</size>
          </plane>
        </geometry>
        <material>
          <script>
            <uri>model://floor_walls_1/materials/scripts/floor_walls_1.material</uri>
            <name>FloorWalls1/Image</name>
          </script>
        </material>
      </visual>
    </link>
  </model>
</sdf>

model.config

<model>
  <name>Floor Walls 1</name>
  <version>1.0</version>
  <sdf version="1.5">model.sdf</sdf>

  <description>
    A simple ground plane with texture.
  </description>
</model>

floor_walls_1.material

material FloorWalls1/Image
{
  technique
  {
    pass
    {
      ambient 1 1 1 1.000000
      diffuse 1 1 1 1.000000
      specular 0.03 0.03 0.03 1.000000 
      emissive 0.900000 0.900000 0.900000 1.000000

      texture_unit
      {
        texture floor.png
        scale 0.01 0.01
      }
    }
  }
}

floor.png

THE PROBLEM:

Unfortunately this only produces a very weird image (yellow with some anti-aliasing black stripes).

How can I fix the ground plane so that it shows the image at full size?