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There are 2, 240 content items of different types and languages related to cobertura de suelos on the Land Portal.

cobertura de suelos

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Codominant water control on global interannual variability and trends in land surface phenology and greenness

Journal Articles & Books
Diciembre, 2015
América Septentrional

Identifying the relative importance of climatic and other environmental controls on the interannual variability and trends in global land surface phenology and greenness is challenging. Firstly, quantifications of land surface phenology and greenness dynamics are impaired by differences between satellite data sets and phenology detection methods. Secondly, dynamic global vegetation models (DGVMs) that can be used to diagnose controls still reveal structural limitations and contrasting sensitivities to environmental drivers.

Clustering based on eigenspace transformation – CBEST for efficient classification

Journal Articles & Books
Diciembre, 2013

Large remote sensing datasets, that either cover large areas or have high spatial resolution, are often a burden of information mining for scientific studies. Here, we present an approach that conducts clustering after gray-level vector reduction. In this manner, the speed of clustering can be considerably improved. The approach features applying eigenspace transformation to the dataset followed by compressing the data in the eigenspace and storing them in coded matrices and vectors.

Random forests and stochastic gradient boosting for predicting tree canopy cover: comparing tuning processes and model performance1

Journal Articles & Books
Diciembre, 2015

As part of the development of the 2011 National Land Cover Database (NLCD) tree canopy cover layer, a pilot project was launched to test the use of high-resolution photography coupled with extensive ancillary data to map the distribution of tree canopy cover over four study regions in the conterminous US. Two stochastic modeling techniques, random forests (RF) and stochastic gradient boosting (SGB), are compared.

Integrating geospatial and ground geophysical information as guidelines for groundwater potential zones in hard rock terrains of south India

Journal Articles & Books
Diciembre, 2012
India

The increasing demand of water has brought tremendous pressure on groundwater resources in the regions were groundwater is prime source of water. The objective of this study was to explore groundwater potential zones in Maheshwaram watershed of Andhra Pradesh, India with semi-arid climatic condition and hard rock granitic terrain. GIS-based modelling was used to integrate remote sensing and geophysical data to delineate groundwater potential zones.

Windstorm disturbance effects on mountain stream ecosystems and the Plecoptera assemblages

Journal Articles & Books
Diciembre, 2015

Within the investigated river basins the deforestation ranged from 0-45.5%, dependent on the amount of windstorm damage. Our water temperature readings revealed that the canopy elimination above the streams in the areas damaged by the windstorm caused increase in daily and annual water temperature and also wider daily water temperature range, than those in the undisturbed reference stream, which caused the decline of cold stenotherm species abundance. The stream basins deforestation was collinear with FPOM and UFPOM concentrations, water temperature gradient and nitrate concentrations.

Assessment of shallow landslides from Hurricane Mitch in central America using a physically based model

Journal Articles & Books
Diciembre, 2012
Honduras
Estados Unidos de América

Shallow landslides induced by heavy rainfall events represent one of the most disastrous hazards in mountainous regions because of their high frequency and rapid mobility. Recent advancements in the availability and accessibility of remote sensing data, including topography, land cover and precipitation products, allow landslide hazard assessment to be considered at larger spatial scales. A theoretical framework for a landslide forecasting system was prototyped in this study using several remotely sensed and surface parameters.

Within-territory use of different land cover types by tropical forest birds in a fragmented landscape

Journal Articles & Books
Diciembre, 2013

Many terrestrial species of birds have been observed to depend on large contiguous areas of forest; in the tropics this appears to be especially true for terrestrial insectivores. Far less is understood about how more-common species, that are less dependent on interior forests, use both forested and non-forested habitat in fragmented landscapes.

Controls on the phosphorus content of fine stream bed sediments in agricultural headwater catchments at the landscape-scale

Journal Articles & Books
Diciembre, 2011

There have been no landscape-scale assessments which quantify the relative importance of the organic and mineral properties of BS (bed sediment) and associated catchment characteristics (geology, land cover and mean topsoil phosphorus (P) content) for BSP concentration.

Landslide hazard and risk analyses at a landslide prone catchment area using statistical based geospatial model

Journal Articles & Books
Diciembre, 2011
Malasia

This paper presents the application of remote sensing techniques, digital image analysis and Geographic Information System tools to delineate the degree of landslide hazard and risk areas in the Balik Pulau area in Penang Island, Malaysia. Its causes were analysed through various thematic attribute data layers for the study area. Firstly, landslide locations were identified in the study area from the interpretation of aerial photographs, satellite imageries, field surveys, reports and previous landslide inventories.

Analysis of land-cover transitions based on 17th and 18th century cadastral maps and aerial photographs

Journal Articles & Books
Diciembre, 2001
Suecia

This paper explores the possibility of using non-geometric cadastral maps from the 17th and 18th century together with aerial photographs from 1945 and 1981 to analyse land-cover change in south-east Sweden. Habitats rich in plant species in the European rural landscape seem to be correlated with a long continuity of management. Accurate spatial data from historical data sources are fundamental to understand patterns of vegetation and biodiversity in the present-day landscape.

Mitigating the impact of oil‐palm monoculture on freshwater fishes in Southeast Asia

Journal Articles & Books
Diciembre, 2015
Indonesia
Asia sudoriental

Anthropogenic land‐cover change is driving biodiversity loss worldwide. At the epicenter of this crisis lies Southeast Asia, where biodiversity‐rich forests are being converted to oil‐palm monocultures. As demand for palm oil increases, there is an urgent need to find strategies that maintain biodiversity in plantations. Previous studies found that retaining forest patches within plantations benefited some terrestrial taxa but not others. However, no study has focused on aquatic taxa such as fishes, despite their importance to human well‐being.