Table 1.
Variables used to explain Prosopis distribution and abundance in the Afar Region.
| Variable abbreviations | Description | Source |
|---|---|---|
| Rain | Mean annual rainfall | Ethiopian National Meteorol. Agency |
| Temp | Mean monthly temperature | Ethiopian National Meteorol. Agency |
| LSTd | Monthly land surface temperature during daytime and nighttime; for the modelling 5-year averages were calculated | MODIS, NASA |
| LSTn | Monthly land surface temperature during nighttime; for the modelling 5-year averages were calculated | MODIS, NASA |
| PAN | Panchromatic reflectance | Landsat 8 OLI, USGS |
| Red | Red reflectance | Landsat 8 OLI, USGS |
| NIR | Near-infrared reflectance | Landsat 8 OLI, USGS |
| SWIR1 | Shortwave infrared band 6 reflectance | Landsat 8 OLI, USGS |
| NDVI | Normalized difference vegetation index | Calculated from Landsat 8 OLI, USGS |
| Elevation | Shuttle Radar Topography Mission digital elevation model (30 m spatial resolution) | USGS |
| Slope | Derived from Elevation | Calculated from Elevation |
| Relief | Derived from Elevation | Calculated from Elevation |
| Landform | Derived from Elevation | Topographic position index derived from elevation, aspect and slope |
| Rugged | Derived from Elevation | Ruggeddeness index calculated from Elevation |
| DistRoad | Distances derived from road network data | Ethiopian Road Authority |
| DistVillage | Distances derived from settlement data | Calculated from EthioGIS and Central Statistical Agency |
| DistRiver | Distances derived from data on watercourses | Calculated from EthioGIS |
MODIS: Moderate Resolution Imaging Spectroradiometer; NASA: National Aeronautics and Space Administration; USGS: United States Geological Survey.