This work addresses the remotely sensed urban heat sink formation in Santiago City, Chile. The main aim was to analyse relationship that surface temperature exhibits with land cover types, as well vegetation fraction, moisture and albedo of City its rural surroundings. Information extracted from processing Landsat Enhanced Thematic Mapper Plus (ETM+) data. Surface classes correlation coefficients between above‐mentioned parameters were analysed. results show hottest surfaces are mainly...

Abstract. Remote sensors face challenges in characterizing mountain permafrost and ground thermal conditions or mapping rock glaciers debris-covered glaciers. We explore the potential of imaging particular inertia cryospheric research, focusing on relationships between surface temperatures presence ice-debris landforms one side land temperature (LST) apparent (ATI) other. In our case study we utilize ASTER daytime nighttime imagery in-situ measurements near-surface (NSGT) Mediterranean Andes...

The causes associated with the land surface temperature (LST) response of Santiago city and its rural surroundings are examined in an attempt to assess urban heat island (SUHI). Seven Landsat ASTER images acquired on summer mornings between 1998 2005 were processed. For each image LST was for areas, main land-cover types, then correlated vegetation cover, soil moisture content, albedo. At time data acquisition, warmer conditions dry poorly vegetated land-covers northern valley result a...

Hyperspectral imaging can be a useful remote-sensing technology for classifying tree species. Prior to the image classification stage, effective mapping endeavours must first identify optimal spectral and spatial resolutions discriminating species of interest. Such procedure may contribute improving accuracy, as well acquisition planning. In this work, we address effect degrading original bandwidth pixel size hyperspectral hyperspatial Sclerophyll forest A HySpex-VNIR 1600 airborne-based...

Abstract We explore the suitability of vegetation indices derived from satellite hyperspectral data for identifying stress symptoms induced by invasion cypress aphid (Cinara cupressi Buckton complex) in a Ciprés de La Cordillera (Austrocedrus chilensis (D. Don) Pic.Serm. & M.P. Bizzarri) forest, located Andes mountain range central Chile. A set 11 related to leaf physiology was retrieved processing Hyperion image study area. The indicies were correlated with percentage chlorosis and necrosis...

Abstract The use of remote sensing data is an alternative approach to extrapolate forest variables measured in the field over large and inaccessible forested areas. objective this study was investigate relationship between four remotely sensed vegetation parameters (simple ratio, SR; normalized difference index, NDVI; green GNDVI; cover fraction, VCF) a Nothofagus pumilio forest. Forest were Magellan Region Chile retrieved from Advanced Spaceborne Thermal Emission Reflection Radiometer...

We investigate the spatio-temporal variability of normalized difference vegetation index (NDVI) associated with deforestation in four zones southeastern Peru (Madre de Dios Region): (1) an area comprising part Tahuamanu province (mainly, but it also comprises a small Tambopata province), (2) watershed, (3) surrounding areas Iñapari and Iberia towns, (4) another district which we labelled as Iñapari-B. have utilized three statistical tools: empirical orthogonal function (EOF), Fourier...

Urbanization is spreading across the world and beyond metropolitan areas. Medium-sized cities have also undergone processes of accelerated urban expansion, especially in Latin America, thanks to scant regulation or a complete lack thereof. Thus, understanding growth past simulating it future has become tool raise its visibility challenge territorial planners. In this work, we use Markov chains, cellular automata, multi-criteria multi-objective evaluation, determination land use/land cover...

<p>This study analyzed the state of recovery burnt vegetation in National Park Torres del Paine between December, 2011 and March, 2012. The calculation comparison NVDI (normalized difference index) area throughout a time series 24 Landsat images acquired before, during after fire (2009- 2015), showed temporal variation biomass levels vegetation. subsequent classification spectral indices: NDVI, NBR ratio) NDWI water on full-data available phenologically matched pre- post-fire image...

Remotely sensed burn severity modelling is commonly addressed by regressing fire-induced forest biophysical damage measured in the field, using Composite Burn Index (CBI) method on a pre- to post-fire difference of normalized ratio (∆NBR) representing early fire effects. Although less often addressed, it may also be modelled wider temporal range assess longer-lasting ecological However, this approach involve larger set potential predictors, posing high-dimensional statistical issue. This...

Forest inventory data can be used along with remotely sensed to estimate biomass and carbon stocks over large inaccessible forested areas. In this study, the relationship between satellite-derived multispectral forest variables from intervened non-intervened Nothofagus pumilio stands located in Magellan region of Chile was examined, order quantify bark volume (OBV) aboveground tree (AGTB). Four vegetation parameters – green normalised difference index (GNDVI), (NDVI), simple ratio (SR) cover...

This study explored the capabilities offered by aerosol optical depth (AOD) product (created on a daily basis from MODIS (Moderate Resolution Imaging Spectroradiometer) images acquired at 10:30 AM and 1:30 PM local time, to predict at-surface concentrations of fine particulate matter (PM2.5) measured monitoring stations city Santiago, Chile, during summer months 2016. To accomplish that, linear correlations were performed between remote-based field-based data sources, both matched in time...

Abstract. Remote sensors face challenges in characterizing mountain permafrost and ground thermal conditions or mapping rock glaciers debris-covered glaciers. We explore the potentials of imaging particular inertia cryospheric research, focusing on relationships between surface temperatures presence ice-debris landforms one side land temperature (LST) apparent (ATI) other. In our case study we utilize ASTER daytime nighttime imagery in-situ measurements near-surface (NSGT) Mediterranean...

Aquí es examinada la relación que presenta el producto de grosor óptico aerosoles (aerosol optical depth, AOD) MAIAC (Multi-Angle Implementation of Atmospheric Correction), derivado imágenes satelitales MODIS (Moderate Resolution Imaging Spectroradiometer), con contagios COVID-19, un campo investigación aún permanece inexplorado en estado del arte internacional, cuyo abordaje contribuiría a comprender incidencia contaminación atmosférica ocurrencia casos esa enfermedad sobre grandes urbes....

El albedo juega un rol crítico en el balance de masa glaciar, por cuanto incide su ablación. En este trabajo fue evaluada la dinámica del teledetectado los glaciares Turbio y Pedregoso Volcán Villarrica, luego ocurrido evento eruptivo gran magnitud 2015, que significó recubrimiento parcial tefras. derivado desde ocho imágenes satelitales ASTER (Advanced Spaceborn Thermal Emission and Reflection Radiometer), adquiridas fechas estivales casi-aniversario antes, durante después cuestión...

This study assessed the impact of Nilahue-Barahona fire, occurred during summer 2017, in VI Region Chile. To do that, differentials vegetation spectral indices were derived from Sentinel-2 optical satellite images acquired on ex-ante and ex-post dates. Differentials state (of vigor, turgor calcination) resulting a subtraction between an image before fire another one once it was extinguished used as calcination severity measure vegetation. Meanwhile, indices' same just year recovery calcined...

This work examined the utility of multispectral remote sensing to recognize effects produced by infestation cypress aphid (Cinara cupressi) in sanitary condition cordillera (Austrocedrus chilensis).The study area is Fundo Los Cipreses, located foothills sector San Fernando County, Maule Region Chile.Procedures focused on recognition variations foliage vigor and turgidity infested A. chilensis using ASTER images acquired at periods preinfestation (March, 2003) 2008).Both parameters were...

Landsat-8 time series were used to classify major crops types in Maipo and Aconcagua valleys, central Chile. In the former valley four fruit-tree classified applying different machine learning techniques on feature sets comprising typical index-based temporal profiles, like those using normalized difference vegetation index, complete spectral resolution of series. latter six only by LDA (linear discriminant analysis), found best performing classifier for Valley. was applied a set adding all...

This study analyzed the state of recovery vegetation burnt in National Park Torres del Paine by Olguín fire between December, 2011 and March, 2012. To do this, pre- post-fire NDVI images were created from a time series 24 Landsat (acquired April, 2009 2015). The dynamic was examined comparing values across series. biomass variation mapped classifying acquired same month (October 2014). results indicate that most area (58.61%), corresponding to pre-Andean scrubs, diminished its levels for...

This study derived albedo measurements from the Olivares Alfa, Beta and Gama glaciers, placed on central Chilean Andes, by processing Landsat-8 satellite images acquired in January 1990, 1996 2017. The aim was to estimate spatiotemporal variations of such a variable. Between 1990 2017, average Alfa glacier decreased 0.17 (0.43-0.26), which translated into an annual rate decrease 1.78%. On same period, 0.09 (0.48-0.39), 1.33%, while 0.12 (0.45-0.33), translating 1.1%. mapping differential...

To assess the damage produced by wildfires on forest ecosystems is a critical task for their subsequent management and ecological restoration. Satellite-based optical images provide reliable ex-ante ex-post data about vegetation state, making them suitable aforementioned purpose. In this study we assessed two forested lands series of occurred in central Chile during summer 2017. Arithmetic differences from pre- post-fire NDVI (normalized difference index), NDWI water index) NBR burnt ratio)...

Este trabajo estimó la severidad de los incendios forestales Nilahue-Barahona y Las Máquinas, ocurridos en Chile central el verano 2016-17, a partir del modelado empírico-estadístico diferencias aritméticas entre fechas pre- post-incendio índices espectrales sensibles estados vigor, turgencia calcinación vegetal. A lo anterior, fueron creadas cartografías daño que puedan orientar con mayor eficiencia manejo restauración ecológica ecosistemas perturbados. calculadas desde imágenes...