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This study aims to determine changes in the condition of coral reef ecosystems using satellite imagery. The research method used is the Geographic Information System (GIS) approach using Lyzengaalgorithm method with data of Landsat +ETM 7 in 1998, 2008 and Landsat OLI 8 in 2018. The results of this study indicate a decrease in the extent of coral reef conditions in 1998-2008 occurs in live coral cover covering 106.60 ha and the addition of area occurred in dead coral cover covering 147.97 ha. While the decrease of coral reefs condition in 2008-2018 occurs in dead coral cover covering 29.66 ha and the addition of area occurred in live coral cover covering 112.29 ha. Coral mortality index in Nirwana beach with an average 62.28 %, meaning very large coral deaths in this region. Coral mortality index in Cindakir estuary with an average 46.60 %, meaning quite large coral deaths in this region so that coral reefs need to be rehabilitated in these waters, which can be done in form of artificial coral transplants. The coral mortality index in Muara Dua bay average 39 %, meaning that coral mortality is quite large in this region, while the coral mortality index in Ujung Siboko bay average 44.65 %, this means quite a large number of coral deaths in this region, but this location has a very good soft coral and it is necessary to rehabilitate corals in these waters with the form of artificial coral transplants.

The purpose of this study was to determine the condition of the underwater substrate and the location that has the potential to be developed as marine tourism (snorkelling) in Pasumpahan Island, Padang city. The research method used scoring assessment the suitability parameters of marine tourism with weighting the score. The location in this research was Pasumpahan Island waters based on waters brightness, beach type, lifeform, and underwater substrate. Based on the results of the study it can be concluded that 1) the basic substrate of Pasumpahan Island waters is a living coral area of 63,900 m² with a percentage of 25.81%, dead coral covering 75,600 m² with a percentage of 30.54%, and sand covering 108,000 m² with a percentage of 43.63 %; and 2) Pasumpahan Island has a suitability category for snorkelling tours as follows, quite suitable category (S2) with an area of 64,859 m², very suitable category (S1) with an area of 117,276 m².

This study aimed to evaluate the suitability of space utilization conducted in the coastal area ofBungus bay. The research was conducted through field survey with a spatial approach using GeographicInformation System (GIS) in order to know the suitability of area allocations which were served as a protectedzone, utilization zone, and special zone. The results showed that zone II covers an area of 232,9 ha with a scoreof 48,4 and zone II covers an area of 136,2 ha with a score of 23 was not-suitable served as utilization zone,and zone III covers an area of 539,9 ha with a score of 61 was suitable served as utilization zone. Managementalternative for not-suitable category in the protected zone at location 8 can be managed by the establishing ofcoast protection, establishing of stilt house, and the improvement of roads connected to the main road; On theutilization zone of location 11, location 12, location 18, and location 23 can be managed by relocating thesettlement as far as >100 m from the coast, establishing of coast protection, establishing of stilt house, andimproving roads connected to the main road; On the special zone of location 1 can be managed by relocatingthe distance limit of ship track and activity, making of settling ponds for waste discharging, and establishingstilt house; and on the special zone of location 25 can be managed by relocating the distance limit of ship trackand activity, making of settling ponds for waste discharging, and dust suppression (wetting) during coal loading,and unloading.