نتایج جستجو برای: landcover

تعداد نتایج: 566  

2014
Jeya Kumari Suresh Babu

The satellite images at different spectral and spatial resolutions with the aid of image processing techniques can improve the quality of information. Especially image fusion is very helpful to extract the spatial information from two images of different resolution images of same area. An operation of image analysis such as image classification on fused images provides better results in compari...

2013
Johannes Scholz Michael Andorfer Manfred Mittlböck

The article elaborates on the spatial disaggregation approach of the 1km population density grid created by the European Forum for Geostatistics in a defined study area where accurate population reference data are available. The paper presents an approach to disaggregate the population grid to target resolution of 100m and 500m respectively and describes the evaluation methodology. The resultin...

1999
Bruce T. Milne Warren B. Cohen

Validation, mapping, and modeling efforts require accells. We recommend that aggregation of fine-grain measurements during validation of the Moderate Resolution curate methods to transform process rates and ecosystem attributes estimated from small field plots to the 250– Imaging Spectrometer (MODIS) products be based on continuous variables to reduce errors that originate from 1000-m-wide cell...

2009
Julia Linke Gregory J. McDermid

Landscape monitoring studies often employ metrics to quantify changes in landscape composition (e.g. proportional forest area) and pattern (e.g. edge density, mean patch size), through the analysis of land cover maps arranged in a time series. Remote sensing plays a key role in such studies; however, the approaches for generating multi-temporal time series are not yet fully developed. For examp...

2008
Hongwei Wang Tash polat Tiyip Jianli Ding Jiangyan Luo

With the current problem of population,resources and environment becoming increasingly intense day by day,the land use/land cover change (LUCC) is one of the core topics on the Present World Change Study.And with the worsening of the global environment,the exhausting of energy and the population explosion,the controversy between the development of oasis economy and the environment has become mo...

2003
Collin Homer Chengquan Huang Limin Yang Bruce Wylie

Multi-Resolution Land Characterization 2001 (MRLC 2001) is a second-generation Federal consortium designed to create an updated pool of nation wide Landsat 5 and 7 imagery, and derive a second-generation National Land Cover Database (NLCD 2001). The objectives of this multi-layer, multi-source database are two fold: first to provide consistent land cover for all 50 States, and second to provide...

Journal: :Remote Sensing 2015
Jun Zhai Ronggao Liu Jiyuan Liu Lin Huang Yuanwei Qin

A large decrease in the land surface albedo of the Loess Plateau was observed from 2000 to 2010, as measured using satellite imagery. In particular, ecological restoration program regions experienced a decrease in peak season land surface albedo exceeding 0.05. In this study, we examined the spatial and temporal patterns of variation during the peak season albedo in the Loess Plateau and analyz...

Journal: :PeerJ PrePrints 2017
Stephanie R. Debats Lyndon D. Estes David R. Thompson Kelly K. Caylor

Sub-Saharan Africa and other developing regions of the world are dominated by smallholder farms, which are characterized by small, heterogeneous, and often indistinct field patterns. In previous work, we developed an algorithm for mapping both smallholder and commercial agricultural fields that includes efficient extraction of a vast set of simple, highly correlated, and interdependent features...

2012
Michael J. Tildesley Sadie J. Ryan

The availability of epidemiological data in the early stages of an outbreak of an infectious disease is vital for modelers to make accurate predictions regarding the likely spread of disease and preferred intervention strategies. However, in some countries, the necessary demographic data are only available at an aggregate scale. We investigated the ability of models of livestock infectious dise...

2004
Ashutosh S. Limaye William L. Crosson Charles A. Laymon Eni G. Njoku

An optimal de-convolution (ODC) technique has been developed to estimate microwave brightness temperatures of agricultural fields using microwave radiometer observations. The technique is applied to airborne measurements taken by the Passive and Active L and S band (PALS) sensor in Iowa during Soil Moisture Experiments in 2002 (SMEX02). Agricultural fields in the study area were predominantly s...

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