Kumasi is the capital city of the Ashanti region and a very important historical centre for Ghana. Located near Lake Bosumtwi in a rainforest region, Kumasi has undergone significant urbanization. The first image shows a comparison between two multi-spectral images acquired over the city, highlighting major urbanization concentrated to the southeast of the city, toward Lake Bosumtwi, with one image from 1986 and another from 2002. The second image is a collage depicting the rapid urbanization of the city from December 1995 to September 2010. The third image is a multi-colour merge created by combining three images, with layers colour-coded to highlight changes: red represents data from 1995, green from 1999, and blue from 2010. The last image contains the three images used to create the third multi-colour merge.

• Image 1: Product: TM (full resolution), Satellite: Landsat 5 and 7, Instrument: Thematic Mapper (TM), Acquisition Dates: 11 Jan 1986 and 20 Mar 2002, Coverage: 185 km x 185 km, Band Combination: 7, 5, 2 (RGB)
• Image 2: Product: ASA_IMP_1P and ERS_SAR_PRI (level 1b full resolution), Satellite: Envisat and ERS-1/2, Instrument: Advanced Synthetic Aperture Radar (ASAR) / (SAR) (30 metre resolution), Acquisition Dates: December 1995 to September 2010
• Image 3: Product: ASA_IMP_1P and ERS_SAR_PRI (level 1b full resolution), Satellite: Envisat and ERS-1/2, Instrument: Advanced Synthetic Aperture Radar (ASAR) / (SAR) (30 metre resolution), Coverage: 100 km along track, Acquisition Dates: 12 Dec 1995, 10 Feb 1999, 15 Sep 2010, Band Combination: Merge layer ENVI - ERS1/2 (RGB)
• Image 4: Product: ASA_IMP_1P and ERS_SAR_PRI (level 1b full resolution), Satellite: Envisat and ERS-1/2, Instrument: Advanced Synthetic Aperture Radar (ASAR) / (SAR) (30 metre resolution), Coverage: 100 km along track, Acquisition Dates: 12 Dec 1995, 10 Feb 1999, 15 Sep 2010, Band Combination: Merge layer ENVI - ERS1/2 (RGB)