# Landcover / Clutter data

The system has several forms of clutter data to enhance above surface accuracy, especially in urban areas.

## 10m Landcover

The primary clutter source is European Space Agency (ESA) 10m Landcover data, published in October 2021.

*WorldCover provides a new baseline global land cover product at 10 m resolution for 2020 based on Sentinel-1 and 2 data that was developed and validated in almost near-real time and at the same time maximizes the impact and uptake for the end users.*

*A tremendous step forward towards the joint use of Sentinel satellite data for worldwide land cover mapping.*

© ESA WorldCover project 2020 / Contains modified Copernicus Sentinel data (2020) processed by ESA WorldCover consortium

This comprehensive dataset covers the planet and has 9 bands for Trees, Shrubland, Grassland, Crops, Built-up, Bare ground, Snow/Ice, Water, Swamps and Mangroves.

## 3D Buildings

A supplementary clutter source are 3D Buildings, derived from Openstreetmap data. These are accurate to 2m and have good coverage in Europe especially.

Public or VM users connected to the Internet can benefit from third party buildings which are automatically pulled in for urban areas worldwide.

## Custom Clutter

All users can draw and self-classify private clutter items in the web interface as polylines or polygons. Using this technique you can represent almost any obstacle from light trees through to concrete.

Large numbers of obstacles can be uploaded as KML or GeoJSON in the web interface.

Uploaded clutter belongs to a user or the system. VM administrators can override clutter ownership manually in the SQL clutter table to make it system clutter for the benefit of all users.

For more information on landcover classes see [Clutter data](https://cloudrf.com/clutter).

<table>
    <td>
        ![](Images/cloudrf_clutter_data.jpg){title="CloudRF clutter data manager" width="500px"}
    </td>
    <td>
        ## 18 Clutter codes

        ### System Landcover

        1 Water

        2 Trees

        3 Grassland

        4 Swamp

        5 Crops

        6 Shrubland

        7 Built-up

        8 Bare ground

        9 Snow / Ice

        ### Custom Clutter

        11 Trees -

        12 Trees +

        13 Timber -

        14 Timber +

        15 Brick -

        16 Brick +

        17 Conrete -

        18 Concrete +

        19 Metal
    </td>
</table>

## Clutter Profiles

Premium users can define custom clutter profiles for regions eg. `AFRICA.clt`, `POLAND.clt`. These are saved within your folder as `.clt` files. VM users can add these locally by placing `.clt` files in the folder.

A `.clt` is a simple text format with tab delimiters and 3 columns: Code Height (m) and nominal Attenuation (dB/m).

The system default, `Minimal.clt`, looks like this. Code `10` is not used.

```console
1	1	0.0
2	1	0.01
3	1	0.0
4	1	0.001
5	1	0.002
6	1	0.002
7	1	0.02
8	1	0
9	1	0
10	0	0
11	6	0.1
12	8	0.2
13	3	0.25
14	4	0.3
15	5	0.4
16	6	0.5
17	7	0.6
18	8	0.7
19	3	1.0
```