#  Data - Extraction raster

This module allows you to create:

- A **Digital Height Model (DHM)** from a Digital Terrain Model (DTM) and a Digital Surface Model (DSM).  
- A **Normalized Difference Vegetation Index (NDVI)** from red and infrared bands.  
- A **tree cover vector layer** by intersecting NDVI and DHM masks. Alternatively, this layer can be generated from LiDAR data using [Generate Tree Cover](../lidar/generate_tc.md).  
- **Forests, groves, linear elements, and individual trees** vector layers derived from the shapes of polygon geometries in the tree cover vector layer.

```{toctree}
:maxdepth: 1
:caption: Table of Contents

manage_raster_tiles
generate_dhm
generate_ndvi
generate_tc
preprocess_cwa
cwa
```