The Araguaia/Tocantins watershed, with 380,000 km 2 drainage basin towards the north portion of Brazil, is one of the major fluvial and phyto-physiognomic system in South America. Its headwaters are situated in the s...
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The Araguaia/Tocantins watershed, with 380,000 km 2 drainage basin towards the north portion of Brazil, is one of the major fluvial and phyto-physiognomic system in South America. Its headwaters are situated in the southern portion of the Brazilian savannas (locally known as Cerrado biome), considered one of the world's biodiversity hotspot. Based on 2006 high spatial resolution CCD imagery (20m) of the CBERS II satellite, in this study we mapped the land cover of the high and middle Araguaia basin (120,000 km 2 ). Our results indicate that only 38.5% of the basin are still preserved, while the others 61.5% present some kind of environmental disturbance. In relation to the riparian vegetation, approximately 44% of the area (directly under the influence of hydrograph network) are already unprotected. This information, currently supporting the Araguaia basin hydrological modelling, certainly will be instrumental for the long term conservation of this unique fluvial ecosystem.
In this paper we investigated the use of the MODIS vegetation indices and the effect of distinct change thresholds for monitoring land cover change in the Cerrado biome, the largest region of neotropical savanna veget...
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In this paper we investigated the use of the MODIS vegetation indices and the effect of distinct change thresholds for monitoring land cover change in the Cerrado biome, the largest region of neotropical savanna vegetation in the world and the most threatened biome in Brazil On a preliminary basis, our results suggest the use of change thresholds between 35 and 42% and the use of the enhanced vegetation index (EVI), which, in comparison to the normalized difference vegetation index (NDVI), showed a more stable and predictable behaviour.
We investigated the use of the MODIS vegetation indices and the effect of distinct change thresholds for monitoring land cover change in the Cerrado biome, the largest region of neotropical savanna vegetation in the w...
详细信息
We investigated the use of the MODIS vegetation indices and the effect of distinct change thresholds for monitoring land cover change in the Cerrado biome, the largest region of neotropical savanna vegetation in the world and the most threatened biome in Brazil. On a preliminary basis, our results suggest the use of change thresholds between 35 and 42% and the us pe of the enhanced vegetation index (EVI), which, in comparison to the normalized difference vegetation index (NDVI), showed a more stable and predictable behaviour.
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