The objective is to characterize land cover change in La Reunion island based on the analysis of aerial IGN ortho-photography from 1950 and 2022.
Data :
- The collection of historical Orthophotos (1950) is accessible from the following website : https://geoservices.ign.fr/bdorthohisto
- The collection of historical Orthophotos (1950) is accessible [from the following website](https://geoservices.ign.fr/bdorthohisto)
The historical map is divided into a mosaic of 130 grayscale tiles, i.e. in a 1-band rasters, ranging from 0 to 255 to represent the light intensity.
The resolution of each image is 50cm/pixel.
- The collection of recent Orthophotos (2022) is accessible from the following website : https://geoservices.ign.fr/bdortho
- The collection of recent Orthophotos (2022) is accessible from the [following website](https://geoservices.ign.fr/bdortho)
The recent map is divided into a mosaic of 130 color tiles, i.e. in RGB (Red, Green, Blue) 3-bands rasters where each band uses pixel value ranging from 0 to 255 to represent the corresponding color intensity. The resolution of each image is 20cm/pixel.
- Preliminary step : A data transformation for the comparison 1950 / 2022 :
