Block Adjustment of High-Resolution Satellite Images Described by Rational Polynomials

Grodecki, Jacek; Dial, Gene

doi:10.14358/pers.69.1.59

Cited by 471 publications

(369 citation statements)

References 1 publication

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“…According to Toutin (2004), the simultaneous solution of an entire image block offers several advantages, for example the number of GCPs can be reduced, better relative accuracy between images can be obtained and finally more homogeneous orthoimages over large areas can be produced. Satellite sensor models described by rational polynomial coefficients (RPC) provide a high potential of simple and accurate geopositioning (Fraser et al, 2006), are ideally suited for block adjustment of narrow field of view sensors (Grodecki and Dial, 2003), but require some bias correction (Fraser and Ravanbakhsh, 2009), and generally serve only as an approximation of physical sensor models when orbital information is not provided in the metadata (Poli and Toutin, 2012). We performed block adjustment and subsequent orthorectification using our own ground control within the Rational Functions model (RPC-based) in OrthoEngine.…”

Section: Multisensor Block Adjustmentmentioning

confidence: 99%

Observing Muostakh disappear: permafrost thaw subsidence and erosion of a ground-ice-rich island in response to arctic summer warming and sea ice reduction

Günther

Overduin

Yakshina³

et al. 2015

The Cryosphere

167

172

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Abstract.Observations of coastline retreat using contemporary very high resolution satellite and historical aerial imagery were compared to measurements of open water fraction, summer air temperature, and wind. We analysed seasonal and interannual variations of thawing-induced cliff top retreat (thermo-denudation) and marine abrasion (thermoabrasion) on Muostakh Island in the southern central Laptev Sea. Geomorphometric analysis revealed that total ground ice content on Muostakh is made up of equal amounts of intrasedimentary and macro ground ice and sums up to 87 %, rendering the island particularly susceptible to erosion along the coast, resulting in land loss. Based on topographic reference measurements during field campaigns, we generated digital elevation models using stereophotogrammetry, in order to block-adjust and orthorectify aerial photographs from 1951 and GeoEye, QuickBird, WorldView-1, and WorldView-2 imagery from 2010 to 2013 for change detection. Using sea ice concentration data from the Special Sensor Microwave Imager (SSM/I) and air temperature time series from nearby Tiksi, we calculated the seasonal duration available for thermo-abrasion, expressed as open water days, and for thermo-denudation, based on the number of days with positive mean daily temperatures. Seasonal dynamics of cliff top retreat revealed rapid thermo-denudation rates of −10.2 ± 4.5 m a −1 in mid-summer and thermo-abrasion rates along the coastline of −3.4 ± 2.7 m a −1 on average during the 2010-2013 observation period, currently almost twice as rapid as the mean rate of −1.8 ± 1.3 m a −1 since 1951. Our results showed a close relationship between mean summer air temperature and coastal thermo-erosion rates, in agreement with observations made for various permafrost coastlines different to the East Siberian Ice Complex coasts elsewhere in the Arctic. Seasonality of coastline retreat and interannual variations of environmental factors suggest that an increasing length of thermo-denudation and thermo-abrasion process simultaneity favours greater coastal erosion. Coastal thermoerosion has reduced the island's area by 0.9 km 2 (24 %) over the past 62 years but shrank its volume by 28 × 10 6 m 3 (40 %), not least because of permafrost thaw subsidence, with the most pronounced with rates of ≥ −11 cm a −1 on yedoma uplands near the island's rapidly eroding northern cape. Recent acceleration in both will halve Muostakh Island's lifetime to less than a century.

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Section: Multisensor Block Adjustmentmentioning

confidence: 99%

Observing Muostakh disappear: permafrost thaw subsidence and erosion of a ground-ice-rich island in response to arctic summer warming and sea ice reduction

Günther

Overduin

Yakshina³

et al. 2015

The Cryosphere

167

172

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“…Image orientation was provided by the rational polynomial coefficients (RPCs) originating from star tracker observations and satellite ephemeris (Fraser et al 2006). This geometric relationship is expressed by 80 coefficients (Grodecki and Dial 2003). To improve image orientation, ground control points (GCPs) were measured by GPS (Trimble Geoexplorer XH 2005) with an accuracy of 610 cm (standard deviation) after differential correction.…”

Section: Image Source Characteristics and Orientationmentioning

confidence: 99%

Gap pattern of the largest primeval beech forest of Europe revealed by remote sensing

et al. 2015

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Abstract. Little is known about the gap pattern of primeval beech forests, since large-scale studies with continuous coverage are lacking. Analyses of forest structural patterns have benefitted from advances in remote sensing, especially with the launch of satellites providing data of submetric ground resolution. These developments can strongly advance our knowledge of natural forest dynamics and disturbance regimes. The Uholka-Shyrokyi Luh forest in the Ukrainian Carpathians, the largest remnant of primeval European beech (Fagus sylvatica L.) covering 102.8 km 2 , is an outstanding object to analyze the frequency distribution of gap sizes and to infer processes of forest dynamics. A stereo pair of very high-resolution WorldView-2 satellite images was used to characterize the forest's gap pattern. Canopy gaps were first digitized stereoscopically based on the image pair. In a second step, spectral properties in the red and yellow frequency bands were used to distinguish the stereoscopically mapped gap areas from non-gap areas, which enabled gap mapping over the entire study area. To validate the spectral gap mapping 338 randomly distributed samples were assigned manually to gap and non-gap areas based on the orthoimages. We found excellent agreement except for an overestimation of gaps close to clouds due to diffuse image areas. The frequency distribution of gap size revealed the forest to be structured by a small-scale mosaic of gaps mainly ,200 m 2 (98% of the gaps). Only a few large, stand-replacing events were detected, most probably caused by a wind storm in March 2007 and a heavy wet snow fall in October 2009. The small canopy gaps reflect fine-scale processes shaping forest structure, i.e., the death of single trees or groups of a few trees and is in line with the findings of the terrestrial forest inventory. We conclude that remote sensing approaches based on very high-resolution satellite images are highly useful to characterize even small-scale forest disturbance regimes and to study long-term gap dynamics. Stereo satellite images provide two viewing angles of the study area, thus allowing for a highly accurate mapping of canopy gaps in forests with a complex topography.

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“…This method is directly related to the geometric properties of the sensor. In the original paper that describes this technique, the authors consider the physical features of Ikonos sensor, but it is demonstrated that it could be used for any sensor with a stable calibration on its interior orientation, a priori corrected exterior orientation and a narrow field of view [22].…”

Section: Bundle Block Adjustmentmentioning

confidence: 99%

“…For this reason, a series of mismatches in the image need to be corrected by the introduction of two parameters, the line parameter and sample parameter. These two include effects of orbit, attitude and residual interior orientation errors in line direction, for the first one, and sample direction for the second one [22].…”

Section: Bundle Block Adjustmentmentioning

confidence: 99%

Detección de cambio en zonas urbanas utilizando MDTs generados automáticamente a partir de imágenes satelitales estereoscópicas de alta resolución espacial

Mora¹

2017

tecnica

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En el modelado espacio-temporal para la detección de cambios verticales, los modelos digitales de elevación(MDE) se utilizan para monitorear los cambios en los valores de altura, mediante una resta entre dosMDEs de diferentes fechas, como técnica básica. El objetivo principal de este trabajo es proponer unaalternativa para mejorar la precisión de la técnica básica de detección de cambios mediante la fusión deMDEs de características similares para aumentar la calidad de los mismos. Este estudio se desarrolló entre2006 y 2011 en dos áreas de prueba. Se generaron dos MDEs robustos a partir de estas fechas, que serestaron para detectar áreas alteradas. Los MDEs se han generado automáticamente utilizando el métodode correspondencia semi global (SGM) a partir de imágenes estereoscópicas de alta resolución espacialproporcionadas por los satélites Ikonos y GeoEye-1. Previamente, todas estas imágenes fueron sometidas aun ajuste de bloque para corregir las diferencias geométricas. La técnica propuesta, en comparación con latécnica básica, ha mejorado la corrección en la detección del cambio 3D al reducir el número de píxelesdetectados como falsos positivos en 2,03% en el Área de Prueba 1 y 3,24% En el área de prueba 2.

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Block Adjustment of High-Resolution Satellite Images Described by Rational Polynomials

Cited by 471 publications

References 1 publication

Observing Muostakh disappear: permafrost thaw subsidence and erosion of a ground-ice-rich island in response to arctic summer warming and sea ice reduction

Observing Muostakh disappear: permafrost thaw subsidence and erosion of a ground-ice-rich island in response to arctic summer warming and sea ice reduction

Gap pattern of the largest primeval beech forest of Europe revealed by remote sensing

Detección de cambio en zonas urbanas utilizando MDTs generados automáticamente a partir de imágenes satelitales estereoscópicas de alta resolución espacial

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