Pasar al contenido principal

page search

Displaying 1033 - 1044 of 2218

Improving 30 m global land-cover map FROM-GLC with time series MODIS and auxiliary data sets: a segmentation-based approach

Journal Articles & Books
Diciembre, 2013

FROM-GLC (Fine Resolution Observation and Monitoring of Global Land Cover) is the first 30 m resolution global land-cover map produced using Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) data. Due to the lack of temporal features as inputs in producing FROM-GLC, considerable confusion exists among land-cover types (e.g. agriculture lands, grasslands, shrublands, and bareland). The Moderate Resolution Imaging Spectrometer (MODIS) provides high-temporal frequency information on surface cover.

Clarity versus complexity: Land-use modeling as a practical tool for decision-makers

Journal Articles & Books
Diciembre, 2013

The last decade has seen a remarkable increase in the number of modeling tools available to examine future land-use and land-cover (LULC) change. Integrated modeling frameworks, agent-based models, cellular automata approaches, and other modeling techniques have substantially improved the representation of complex LULC systems, with each method using a different strategy to address complexity. However, despite the development of new and better modeling tools, the use of these tools is limited for actual planning, decision-making, or policy-making purposes.

Modelling trace metal background to evaluate anthropogenic contamination in arable soils of south-western France

Journal Articles & Books
Diciembre, 2013
Francia

The trace metal (TM) content in arable soils has been monitored across a region of France characterised by a large proportion of calcareous soils. Within this particular geological context, the objectives were to first determine the natural levels of trace metals in the soils and secondly, to assess which sites were significantly contaminated. Because no universal contamination assessment method is currently available, four different methods were applied and compared in order to facilitate the best diagnosis of contamination.

Vegetation and climate of Anatolia and adjacent regions during the Last Glacial period

Journal Articles & Books
Diciembre, 2013

Reinterpretation of vegetation and climatic conditions of Anatolia and neighboring regions during Last Glacial (30–15 cal ka BP) have been done using a non-quantitative biomization approach based on previously published plant functional types. The results suggest that the climate was cold and humid before ∼25 cal ka BP and also during the period ∼23–19 cal ka BP (except East Anatolia). Forest vegetation was 80–90% of the land cover in the northwestern Anatolia and Black Sea coast, and 50–60% along the Mediterranean coast at the same period.

Spatial distribution of greenhouse gas concentrations in arid and semi-arid regions: A case study in East Asia

Journal Articles & Books
Diciembre, 2013
China
Mongolia
Asia oriental

Land degradation and global warming are currently highly active research topics. Land degradation can both change land cover and surface climate and significantly influence atmospheric circulation. Researches have verified that carbon dioxide (CO₂) and methane (CH₄) are major greenhouse gases (GHG) in the atmosphere and are directly affected by human activity. However, to date, there is no research on the spatial distribution of GHG concentrations and also no research on how land degradations affect GHG concentrations in arid and semi-arid regions.

Introduced annual grass increases regional fire activity across the arid western USA (1980–2009)

Journal Articles & Books
Diciembre, 2013
Estados Unidos de América

Non‐native, invasive grasses have been linked to altered grass‐fire cycles worldwide. Although a few studies have quantified resulting changes in fire activity at local scales, and many have speculated about larger scales, regional alterations to fire regimes remain poorly documented. We assessed the influence of large‐scale Bromus tectorum (hereafter cheatgrass) invasion on fire size, duration, spread rate, and interannual variability in comparison to other prominent land cover classes across the Great Basin, USA.

Impacts of transportation arteries on land use patterns in urban-rural fringe: A comparative gradient analysis of Qixia District, Nanjing City, China

Journal Articles & Books
Diciembre, 2013
China

Integrated transportation and land use studies are of major interest to planners because they consider the interaction between transportation development and land use change. Quantifying the impact of transport infrastructure on land use change is necessary for evaluating the role of transportation development in the process of land use and land cover change in the urban-rural fringe.

Land-use change and carbon stocks: A case study, Noor County, Iran

Journal Articles & Books
Diciembre, 2013
Irán

Land-use changes and land cover strongly influence carbon stock and distribution within ecosystems. Changing the land-use from natural forest to other land-uses has been more rapid in the past few decades than at any time in Iran’s history. In this study, we investigated the effects of changing the land-use from natural forest to other land-uses on carbon stocks in northern Iran. We selected five sites for this study: (I) a natural forest, (II) an agricultural field and (III) plantations of three different species (Alnus subcordata. L, Acer velutinum.Boiss and Cupressus sempervirens).

Impact of the geomorphology and soil management on the development of waterlogging in closed drainage basins of Egypt and Saudi Arabia

Journal Articles & Books
Diciembre, 2013
Egipto
Arabia Saudita

This paper investigates the interplay of the catchment geomorphology, hydrology and soil properties on the development of waterlogging and land degradation within different dry land catchments in Egypt and Saudi Arabia. Multi-temporal remote sensing data of the Landsat Thematic Mapper and Enhanced Thematic Mapper were collected and processed to detect the land cover changes and development of cultivations within the two areas.

role of landscape structure in determining palynological and floristic richness

Journal Articles & Books
Diciembre, 2013
Estonia

The associations between floristic and palynological richness and landscape structure were studied based on modern pollen–vegetation data from a patchy cultural landscape in southern Estonia (northern temperate vegetation zone). Nine study sites (small lakes and their surrounding vegetation) represent land cover gradient from closed forest to semi-open vegetation. Floristic richness (number of species) and floristic richness of pollen types (number of pollen-equivalent taxa) were used to describe the vegetation within the radius of 250 m from the pollen sampling sites.

Comparison and enhancement of MODIS cloud mask products for Southeast Asia

Journal Articles & Books
Diciembre, 2013
Asia

Accurate quality information on cloud occurrence is of utmost importance for a wide range of remote-sensing applications and analyses. This study compares the two existing cloud mask products available for the Moderate Resolution Imaging Spectroradiometer (MODIS), stored in the quality layer of the MOD09 daily surface reflectance product. For both masks, statistics on cloud occurrence are calculated for 1 year of daily surface reflectance data covering the area of southeast Asia.

integrated multi-criteria scenario evaluation web tool for participatory land-use planning in urbanized areas: The Ecosystem Portfolio Model

Journal Articles & Books
Diciembre, 2013

Land-use land-cover change is one of the most important and direct drivers of changes in ecosystem functions and services. Given the complexity of the decision-making, there is a need for Internet-based decision support systems with scenario evaluation capabilities to help planners, resource managers and communities visualize, compare and consider trade-offs among the many values at stake in land use planning.