Layer | Data source | Observations |
Contours and elevation points | srtm.csi.cgiar.org/srtmdata | The data was derived from SRTM DEM |
Bathymetry | http://www.gebco.net | The data was derived for openseamap from the GEBCO_2014 Grid |
Roads and Railroads | https://extract.bbbike.org/ | Open street map (after selection, generalization and simplification) |
Land use | ● Open Street map ● Google earth ● Landsat images | The data was derived from OSM road layer and completed and verified by interpreting Landsat images and google earth images |
Points of interest (POIs) Toponyms | ● Google maps ● Google earth ● Geoportal of Jeddah Municipality (smartmap.jeddah.gov.sa) ● Saudi addresses geoportal (maps.adress.gov.sa) | The data was gathered and verified from various sources (crowd-sourced and official data) |
Industrial areas | https://modon.gov.sa/ar/Pages/default.aspx | Free data provided by the Saudi authority for industrial cities and technology zones |
hydrography | ● Old maps ● SRTM DEM ● Landsat images | The data was digitized from legacy maps, and updated by thalweg layer extracted from SRTM DEM and verified by the photo interpretation of Landsat image |
Green areas | Landsat images (downloaded from earthexplorer.usgs.gov) | The data was extracted from Normalized Difference Vegetation Index (NDVI) |