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Integer ambiguity resolution in precise point positionning : method comparison / J. Geng in Journal of geodesy, vol 84 n° 9 (September 2010)
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Titre : Integer ambiguity resolution in precise point positionning : method comparison Type de document : Article/Communication Auteurs : J. Geng, Auteur ; X. Meng, Auteur ; A. Dodson, Auteur ; Felix Norman Teferle, Auteur Année de publication : 2010 Article en page(s) : pp 569 - 581 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] analyse comparative
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] précision millimétrique
[Termes IGN] résolution d'ambiguïtéRésumé : (Auteur) Integer ambiguity resolution at a single receiver can be implemented by applying improved satellite products where the fractional-cycle biases (FCBs) have been separated from the integer ambiguities in a network solution. One method to achieve these products is to estimate the FCBs by averaging the fractional parts of the float ambiguity estimates, and the other is to estimate the integer-recovery clocks by fixing the undifferenced ambiguities to integers in advance. In this paper, we theoretically prove the equivalence of the ambiguity-fixed position estimates derived from these two methods by assuming that the FCBs are hardware-dependent and only they are assimilated into the clocks and ambiguities. To verify this equivalence, we implement both methods in the Position and Navigation Data Analyst software to process 1 year of GPS data from a global network of about 350 stations. The mean biases between all daily position estimates derived from these two methods are only 0.2, 0.1 and 0.0 mm, whereas the standard deviations of all position differences are only 1.3, 0.8 and 2.0 mm for the East, North and Up components, respectively. Moreover, the differences of the position repeatabilities are below 0.2 mm on average for all three components. The RMS of the position estimates minus those from the International GNSS Service weekly solutions for the former method differs by below 0.1 mm on average for each component from that for the latter method. Therefore, considering the recognized millimeter-level precision of current GPS-derived daily positions, these statistics empirically demonstrate the theoretical equivalence of the ambiguity-fixed position estimates derived from these two methods. In practice, we note that the former method is compatible with current official clock-generation methods, whereas the latter method is not, but can potentially lead to slightly better positioning quality. Numéro de notice : A2010-416 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0399-x Date de publication en ligne : 06/08/2010 En ligne : https://doi.org/10.1007/s00190-010-0399-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30609
in Journal of geodesy > vol 84 n° 9 (September 2010) . - pp 569 - 581[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010091 SL Revue Centre de documentation Revues en salle Disponible Persistent scatterer interferometry : potential, limits and initial C- and X-band comparison / M. Crosetto in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 9 (September 2010)
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Titre : Persistent scatterer interferometry : potential, limits and initial C- and X-band comparison Type de document : Article/Communication Auteurs : M. Crosetto, Auteur ; O. Montserrat, Auteur ; R. Iglesias, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 1061 - 1069 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] analyse comparative
[Termes IGN] bande C
[Termes IGN] bande X
[Termes IGN] Barcelone
[Termes IGN] coin réflecteur
[Termes IGN] déformation d'image
[Termes IGN] échantillonnage d'image
[Termes IGN] erreur de positionnement
[Termes IGN] image C-SAR
[Termes IGN] image Envisat-ASAR
[Termes IGN] image ERS-SAR
[Termes IGN] image radar moirée
[Termes IGN] image TerraSAR-X
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] résiduRésumé : (Auteur) This paper is focused on the potential and limits of Persistent Scatterer Interferometry (PSi), a powerful remote sensing technique used to measure deformation phenomena. It only refers to satellite-based PSI techniques, focusing on the most important sources of C-band SAR data: ers and Envisat. In addition, it compares C- and X-band results, considering data from the high-resolution TerraSAR-X sensor. The paper begins with a description of the main characteristics of PSI. It then discusses the most important PSI products and their performances, analyzing their spatial sampling, the so-called residual topographic error and PSI geocoding, the average displacement rates, and the deformation time series. As C-band products are concerned, the paper reports some relevant PSI validation results, which come from the ESA-funded Terrafirma Validation Project. Regarding the X-band, it describes the results obtained over the City of Barcelona by processing 13 TerraSAR-X images. The last part discusses the main limits of PSI. Numéro de notice : A2010-367 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.9.1061 En ligne : https://doi.org/10.14358/PERS.76.9.1061 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30561
in Photogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 9 (September 2010) . - pp 1061 - 1069[article]Comparative evaluation and analysis of online geocoding services / D. Roongpiboonsopit in International journal of geographical information science IJGIS, vol 24 n°7-8 (july 2010)
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Titre : Comparative evaluation and analysis of online geocoding services Type de document : Article/Communication Auteurs : D. Roongpiboonsopit, Auteur ; Hassan A. Karimi, Auteur Année de publication : 2010 Article en page(s) : pp 1081 - 1100 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] analyse comparative
[Termes IGN] géocodage
[Termes IGN] géomatique web
[Termes IGN] qualité de service
[Termes IGN] service fondé sur la position
[Termes IGN] WebSIGRésumé : (Auteur) Geocoding is an uncertain process that associates an address or a place name with geographic coordinates. Traditionally, geocoding is performed locally on a stand-alone computer with the geocoding tools usually bundled in GIS software packages. The use of such tools requires skillful operators who know about the issues of geocoding, that is, reference databases and complicated geocoding interpolation techniques. These days, with the advancement in the Internet and Web services technologies, online geocoding provides its functionality to the Internet users with ease; thus, they are often unaware of such issues. With an increasing number of online geocoding services, which differ in their reference databases, the geocoding algorithms, and the strategy for dealing with inputs and outputs, it is crucial for the service requestors to realize the quality of the geocoded results of each service before choosing one for their applications. This is primarily because any errors associated with the geocoded addresses will be propagated to subsequent decisions, activities, modeling, and analysis. This article examines the quality of five online geocoding services: Geocoder.us, Google, MapPoint, MapQuest, and Yahoo!. The quality of each geocoding service is evaluated with three metrics: match rate, positional accuracy, and similarity. A set of addresses from the US Environmental Protection Agency (EPA) database were used as a baseline. The results were statistically analyzed with respect to different location characteristics. The outcome of this study reveals the differences among the online geocoding services on the quality of their geocoding results and it can be used as a general guideline for selecting a suitable service that matches an application's needs. Numéro de notice : A2010-321 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810903289478 En ligne : https://doi.org/10.1080/13658810903289478 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30515
in International journal of geographical information science IJGIS > vol 24 n°7-8 (july 2010) . - pp 1081 - 1100[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-2010041 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010042 RAB Revue Centre de documentation En réserve L003 Disponible Comparison of dasymetric mapping for small-area population estimates / P. Zandbergen in Cartography and Geographic Information Science, vol 37 n° 3 (July 2010)
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Titre : Comparison of dasymetric mapping for small-area population estimates Type de document : Article/Communication Auteurs : P. Zandbergen, Auteur ; D. Ignizio, Auteur Année de publication : 2010 Article en page(s) : pp 199 - 214 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique
[Termes IGN] analyse comparative
[Termes IGN] carte thématique
[Termes IGN] densité de population
[Termes IGN] figuration de la densité
[Termes IGN] interpolation par pondération de zones
[Termes IGN] occupation du sol
[Termes IGN] recensement démographiqueRésumé : (Auteur) Dasymetric mapping techniques can be employed to estimate population characteristics of small areas that do not correspond to census enumeration areas. Land cover has been the most widely used source of ancillary data in dasymetric mapping. The current research examines the performance of alternative sources of ancillary data, including imperviousness, road networks, and nighttime lights. Nationally available datasets were used in the analysis to allow for replicability. The performance of the techniques used to examine these sources was compared to areal weighting and traditional land cover techniques. Four states were used in the analysis, representing a range of different geographic regions: Connecticut, New Mexico, Oregon, and South Carolina. Ancillary data sources were used to estimate census block group population counts using census tracts as source zones, and the results were compared to the known block group population counts. Results indicate that the performance of dasymetric methods varies substantially among study areas, and no single technique consistently outperforms all others. The three best techniques are imperviousness with values greater than 75 percent removed, imperviousness with values greater than 60 percent removed, and land cover. Total imperviousness and roads perform slightly worse, with nighttime lights performing the worst compared to all other ancillary data types. All techniques performed better than areal weighting. Numéro de notice : A2010-357 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304010792194985 En ligne : https://doi.org/10.1559/152304010792194985 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30551
in Cartography and Geographic Information Science > vol 37 n° 3 (July 2010) . - pp 199 - 214[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-2010031 RAB Revue Centre de documentation En réserve L003 Disponible Vertical crustalmotion derived from satellite altimetry and tide gauges, and comparisons with DORIS measurements / R. Ray in Advances in space research, vol 45 n° 12 (15/06/2010)
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Titre : Vertical crustalmotion derived from satellite altimetry and tide gauges, and comparisons with DORIS measurements Type de document : Article/Communication Auteurs : R. Ray, Auteur ; Brian D. Beckley, Auteur ; Franck G. Lemoine, Auteur Année de publication : 2010 Article en page(s) : pp 1510 - 1522 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] analyse comparative
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] données altimétriques
[Termes IGN] données DORIS
[Termes IGN] données marégraphiques
[Termes IGN] marée terrestre
[Termes IGN] série temporelleRésumé : (Auteur) A somewhat unorthodox method for determining vertical crustal motion at a tide-gauge location is to difference the sea level time series with an equivalent time series determined from satellite altimetry. To the extent that both instruments measure an identical ocean signal, the difference will be dominated by vertical land motion at the gauge. We revisit this technique by analyzing sea level signals at 28 tide gauges that are colocated with DORIS geodetic stations. Comparisons of altimeter-gauge vertical rates with DORIS rates yield a median difference of 1.8 mm yr-1 and a weighted root-mean-square difference of 2.7 mm yr-1. The latter suggests that our uncertainty estimates, which are primarily based on an assumed AR(1) noise process in all time series, underestimates the true errors. Several sources of additional error are discussed, including possible scale errors in the terrestrial reference frame to which altimeter-gauge rates are mostly insensitive. One of our stations, Malè, Maldives, which has been the subject of some uninformed arguments about sea-level rise, is found to have almost no vertical motion, and thus is vulnerable to rising sea levels. Numéro de notice : A2010-364 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.02.020 En ligne : https://doi.org/10.1016/j.asr.2010.02.020 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30558
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1510 - 1522[article]Definition of ICESat selection criteria for their use as height references for TanDEM-X / J. Gonzalez in IEEE Transactions on geoscience and remote sensing, vol 48 n° 6 (June 2010)
PermalinkConsistency of accuracy assessment indices for soft classification: simulation analysis / J. Chen in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)
PermalinkDigital camera performance where spatial resolution is determined by the optical component / G.H. Thomson in Photogrammetric record, vol 25 n° 129 (March - May 2010)
PermalinkLand-cover change detection using one-class support vector machine / P. Li in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 3 (March 2010)
PermalinkReady to navigate: a methodology for the estimation of the time-to-first-fix / M. Anghileri in Inside GNSS, vol 5 n° 2 (March - April 2010)
PermalinkVolunteered geographic information to authoritative databases: linking contributor motivations to program characteristics / David Coleman in Geomatica, vol 64 n° 1 (March 2010)
PermalinkAn intercomparison of simulated rainfall and evapotranspiration associated with a mesoscale convective system over West Africa / Françoise Guichard in Weather and Forecasting, vol 25 n° 1 (February 2010)
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PermalinkMapping an annual weed with colour-infared aerial photography and image analysis / James H. Everitt in Geocarto international, vol 25 n° 1 (February 2010)
PermalinkPermalinkBiais et dérives dans l'altimétrie satellitale à partir de comparaisons avec des marégraphes co-localisés avec des stations GPS / Médéric Gravelle (2010)
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