Revista de Teledetección - Núm. 41 (2014)
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Research articles
- Cartografía de sales marinas y fluviales en estuarios receptores de aguas ácidas con imágenes hiperespectrales Hyperion (Marismas del río Odiel, Huelva)
- Aplicación de datos LiDAR aéreo para el cálculo de cuencas visuales
- Detección remota de invernaderos a partir de estéreo pares del satélite WorldView-2
- Mapas de calendario de cultivo y variables fenológicas mediante el análisis de imágenes MODIS y ASTER basado en objetos
- Modelo empírico para la determinación de clorofila-a en aguas continentales a partir de los futuros Sentinel-2 y 3. Validación con imágenes HICO
- Estimación del potencial eólico off-shore en las costas de Chile utilizando datos de escaterómetro y Reanalysis
- Validación local de la temperatura superficial del mar del sensor MODIS en aguas someras del Mediterráneo occidental
- Evaluación multitemporal de métodos de corrección topográfica mediante el uso de imágenes sintéticas multiespectrales
Practical cases
- El radiómetro de microondas MWR de Sentinel-3: Nuestra contribución al éxito de Copernicus
- RBX: El nuevo radar SAR en banda X del INTA
- Explotación científica de productos PAZ en tareas de vigilancia y monitorización costera
- Misión FLEX (Fluorescence Explorer): Observación de la fluorescencia por teledetección como nueva técnica de estudio del estado de la vegetación terrestre a escala global
- Aplicación de UAVS a la detección de fauna como soporte a los censos cinegéticos. REDIAM
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- PublicationAplicación de datos LiDAR aéreo para el cálculo de cuencas visuales(Editorial Universitat Politècnica de València, 2014-06-24) Pellicer, I.; Estornell Cremades, Javier; Martí, J.; Departamento de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Politécnica Superior de Gandia; Grupo de Cartografía Geoambiental y Teledetección[EN] The environmental impact assessment and landscape analysis of any work or activity over the territory requires a study of the visual impact what can be done from the application of viewshed analysis. The accuracy of these results depends largely on the parameters for calculating them, accuracy and spatial resolution of initial elevation data and digital models derived. In this study viewshed analysis in 4 areas of the town of Gandia with different characteristics (urban, forest, beach, mixed) were analyzed from 4 types of geographic information: a) Digital Elevation Model (DEM) and b) Digital Surface Model (DSM) derived from LiDAR data with density of 1 point/m2; c) DTM from a photogrammetric flight with a pixel size of 5×5 m; d) Overlay cadastral cartography with the previous DTM. For the validation of the results, 120 checking points were used to calculate the overall accuracy and kappa index. The results showed a high overall accuracy for the viewsheds calculated from the DSM derived from LiDAR data being the overall accuracy and index kappa 90% and 0.80, respectively. The conclusions drawn from this study indicated that the use of this source of information showed a good performance for the generation of viewshed analysis.
- PublicationAplicación de UAVS a la detección de fauna como soporte a los censos cinegéticos. REDIAM(Editorial Universitat Politècnica de València, 2014-06-24) Prieto Molina, R.; Méndez, E.; Vales, J.J.; Pino, I.; Carpintero, I.R.; Granado, L.; Montoya, G.; Giménez de Azcárate, F.; Cáceres, F.; Moreira, J.M.[EN] The following paper details the methodology for analyzing the potential of Unmanned Aerial Vehicles (UAV) as suitable observation platforms for obtaining thermal images of hunting areas, and for the estimation of number of individuals for these populations (fauna, in this case deer). Due to limitations detected in the initial information, some of the work stages are alternative approaches to an optimal process. On this basis, specific technical flight requirements are proposed in order to carry out a more appropriate analysis.
- PublicationCartografía de sales marinas y fluviales en estuarios receptores de aguas ácidas con imágenes hiperespectrales Hyperion (Marismas del río Odiel, Huelva)(Editorial Universitat Politècnica de València, 2014-06-24) Riaza, A.; García-Meléndez, E.; Carrère, V.; Mueller, A.; Ministerio de Educación y Ciencia; Ministerio de Ciencia e Innovación[EN] Temporal monitoring of salt efflorescence on the marshes at the mouth of the river Odiel (Huelva) is made using hyperspectral archive Hyperion data. Climate variability estimations are made based on well-known spectral features related to vegetation and shallow water, using archive spectral libraries. The observations point to spectral and geomorphological indicators which can be monitored through image processing supported by field and laboratory spectral data, on a repeatable basis. Mapping a larger sequence of images under different climate regime and wider tidal range, would improve the estimation of spectral features to ensure a routine monitoring of salt crusts with hyperspectral data.
- PublicationDetección remota de invernaderos a partir de estéreo pares del satélite WorldView-2(Editorial Universitat Politècnica de València, 2014-06-24) Aguilar, M.A.; Montalbán, M.A.; Saldaña, M.M.; Aguilar, F.J.; Fernández, I.; García-Lorca, A.M.; Ministerio de Ciencia e Innovación; European Commission; European Regional Development Fund; Junta de Andalucía; Ministerio de Economía y Competitividad[EN] The successful launch of the first very high resolution (VHR) satellites capable of capturing panchromatic imagery of the land surface with ground sample distance even lower than 1 m (e.g. IKONOS in 1999 or QuickBird in 2001) marked the beginning of a wholly new age in remote sensing. On January 4, 2010, images of WorldView-2 were placed on the market. Possibly it is the most sophisticated commercial VHR satellite currently orbiting the Earth and the exploitation of its data poses a challenge to researchers worldwide. Moreover, the practice of under plastic agriculture had a great development in the Mediterranean area during the past 60 years, especially in Almeria, acting as a key economic driver in the area. The goal of this work is the automatic greenhouse mapping by using Object Based Image Analysis (OBIA). The required input data will be a pan-sharpened orthoimage and a normalized digital surface model (nDSM) for objects, both products generated from a WorldView-2 stereo pair. The attained results show that the very high resolution 8-band multispectral and the nDSM data improve the greenhouses automatic detection. In this way, overall accuracies higher than 90% can be achieved.
- PublicationEstimación del potencial eólico off-shore en las costas de Chile utilizando datos de escaterómetro y Reanalysis(Editorial Universitat Politècnica de València, 2014-06-24) Mattar, C.; Villar-Poblete, N.; Universidad de Chile[EN] This work presents the first offshore wind potential estimation over the coast of Chile using long term data series from “QuikSCAT (V04) wind vectors” and ERA-interim’s wind product between 1999-2009 and 1979-2012, respectively. Weibull and Rayleigh’s distribution were used to adjust the data series from the study period to find the probability density function, mean wind speed, maximum and minimum from each data series adjusted per pixel. Power generation and a capacity factor were estimated for the whole scene using three wind turbine models corresponding to 3.6, 5.0 and 8.0 MW. The images obtained from the data processing were grouped into three different wind power zones named (A) located up north, (B) in the center and (C) down south-center. The mean capacity factors are higher than 20%, moreover B and C areas have an average of 36%. This work shows the high wind power potential to generate electricity by using wind off-shore technologies along the coast of Chile.
- PublicationEvaluación multitemporal de métodos de corrección topográfica mediante el uso de imágenes sintéticas multiespectrales(Editorial Universitat Politècnica de València, 2014-06-24) Sola, I.; González-Audícana, M.; Álvarez-Mozos, J.; Torres, J.L.[EN] This paper presents a multitemporal evaluation of topographic correction (TOC) methods based on synthetically generated images in order to evaluate the influence of solar angles on the performance of TOC methods. These synthetic images represent the radiance an optical sensor would receive for different periods of the year considering the real topography (SR image), and considering the relief completely horizontal (SH image). The comparison between the corrected image obtained applying a TOC method to a SR image and the SH image of the same area, i.e. considered the ideal correction, allows assessing the performance of each TOC algorithm, quantitatively measured through the Structural Similarity Index (SSIM).
- PublicationExplotación científica de productos PAZ en tareas de vigilancia y monitorización costera(Editorial Universitat Politècnica de València, 2014-06-24) Jarabo Amores, M.P.; González Bonilla, M.J.; Mata Moya, D. de la; Martín de Nicolás Presa, J.; Rey Maestre, N. del; Bárcena Humanes, J.L.; Peláez Sánchez, V.M.[EN] PAZ mission appears due to the need of a Spanish SAR satellite able to provide radar image products for security and defense, civil and scientific users. INTA is responsible for the technical direction of the Ground Segment, as well as the development of the Calibration and Validation Centre and the scientific exploitation. The ‘Demonstrator of Maritime SAR Applications’ is proposed as an answer to detection tasks in maritime synthetic aperture radar imagery, which are not completely solved yet. DeMSAR has been developed in the framework of a contract between the Spanish National Institute for Aerospace Technology (INTA) and the University of Alcalá. It is intended to be used as a demonstrator of the capabilities of the airborne SAR prototypes of INTA as well as for PAZ, the Spanish SAR satellite. With two operation modes, an automatic ship detector and a toolboxes mode, DeMSAR offers the user a high flexibility in SAR data processing tasks such as speckle filtering, coastline detection, land mask estimation and ship detection and characterization.
- PublicationMapas de calendario de cultivo y variables fenológicas mediante el análisis de imágenes MODIS y ASTER basado en objetos(Editorial Universitat Politècnica de València, 2014-06-24) De Castro, A.I.; Plant, R.E.; Six, J.; Peña, J.M.; Ministerio de Ciencia e Innovación; Kearney Foundation of Soil Science[EN] A method to generate crop calendar and phenology-related maps at a parcel level of four major irrigated crops (rice, maize, sunflower and tomato) is shown. The method combines images from the ASTER and MODIS sensors in an object-based image analysis framework, as well as testing of three different fitting curves by using the TIMESAT software. Averaged estimation of calendar dates were 85%, from 92% in the estimation of emergence and harvest dates in rice to 69% in the case of harvest date in tomato.
- PublicationMisión FLEX (Fluorescence Explorer): Observación de la fluorescencia por teledetección como nueva técnica de estudio del estado de la vegetación terrestre a escala global(Editorial Universitat Politècnica de València, 2014-06-24) Moreno, J.; Alonso, L.; Delegido, J.; Rivera, J.P.; Ruiz-Verdú, A.; Sabater, N.; Tenjo, C.; Verrelst, J.; Vicent, J.; Ministerio de Ciencia e Innovación[EN] FLEX (Fluorescence EXplorer) is a candidate for the 8th ESA’s Earth Explorer mission. Is the first space mission specifically designed for the estimation of vegetation fluorescence on a global scale. The mission is proposed to fly in tandem with the future ESA´s Sentinel-3 satellite. It is foreseen that the information obtained by Sentinel-3 will be supplemented with that provided by FLORIS (Fluorescence Imaging Spectrometer) onboard FLEX. FLORIS will measure the radiance between 500 and 800 nm with a bandwidth between 0.1 nm and 2 nm, providing images with a 150 km swath and 300 m pixel size. This information will allow a detailed monitoring of vegetation dynamics, by improving the methods for the estimation of classical biophysical parameters, and by introducing a new one: fluorescence. This paper presents the current status of FLEX mission in A/B1 phase and the different ongoing studies, campaigns and projects carried out in support of the FLEX mission.
- PublicationModelo empírico para la determinación de clorofila-a en aguas continentales a partir de los futuros Sentinel-2 y 3. Validación con imágenes HICO(Editorial Universitat Politècnica de València, 2014-06-24) Delegido, J.; Tenjo, C.; Ruiz-Verdú, A.; Peña, R.; Moreno, J.[EN] Chlorophyll-a concentration is one of the main indicators of inland waters quality. Using CHRIS/PROBA images and in situ data obtained in four lakes in Colombia and Spain, we obtained empirical models for the estimation of chlorophyll-a concentration, which can be directly applied to future images of MSI Sentinel-2 and OLCI Sentinel-3 sensors. The models, based on spectral band indices, were validated with data from the hyperspectral sensor HICO, onboard of the International Space Station.
- PublicationEl radiómetro de microondas MWR de Sentinel-3: Nuestra contribución al éxito de Copernicus(Editorial Universitat Politècnica de València, 2014-06-24) Palacios, M.A.; Bergadà, M.; González, R.; Gamonal, A.; García-Fernández, J.L.; Camacho, Y.[EN] The MWR builds, together with the SRAL altimeter, the S3 topography mission. The MWR, developed by EADS CASA Espacio as prime contractor, provides information for tropospheric path correction of SRAL measurements. MWR data can also be used for determining surface emissivity and soil moisture over land, surface energy budget investigations and ice characterization. The MWR instrument is a Noise Injection Radiometer (NIR), working at two frequencies (23.8/36.5 GHz), embarking a dual frequency horn antenna pointing to the cold sky for embedded autonomous calibration.
- PublicationRBX: El nuevo radar SAR en banda X del INTA(Editorial Universitat Politècnica de València, 2014-06-24) Larrañaga, J.R.; de Porras, R.; del Castillo, J.; Gimeno, N.; Aguilar, P.; Baquero, A.M.; Casal, N.; Cifuentes, P.; Cores, J.F.; Cuerda, J.M.; García, M.; Gómez, B.; González, M.J.; López, A.; Madroño, D.; Ojalvo, L.; Pedreira, A.; Sánchez, S.[EN] This paper describes the characteristics and the first results of the RBX system, the new airborne Synthetic Aperture Radar developed at Spanish National Institute of Aerospace Technology. The new system supports submetric resolution with interferometric and polarimetric capabilities. The system architecture has been designed taking into account an easy upgrade ability and the quality of the acquired data, including multiple internal calibration loops.
- PublicationValidación local de la temperatura superficial del mar del sensor MODIS en aguas someras del Mediterráneo occidental(Editorial Universitat Politècnica de València, 2014-06-24) Durá, E.; Mendiguren, G.; Martín, M.P.; Acevedo-Dudley, M.J.; Bosch-Bolmar, M.; Fuentes, V.L.; Bordehore, C.; European Commission; Consejo Superior de Investigaciones Científicas[EN] The sea surface temperature (SST) estimated from MODIS Aqua products (daytime and nighttime 11 μm and night 4 μm) has been correlated with field data taken at three depths (15, 50, 100 cm) in a Western Mediterranean coastal area. The comparison has allowed us to analyze the uncertainty in the estimation of this parameter in coastal waters using low spatial resolution satellite images. The results show that the daytime SST_11 μm product obtains fittest statistical values: RMSE (root mean square error) and r2 (Pearson’s correlation coefficient) of 1°C and 0.96, respectively, for 50 cm depth.