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A quantitative measure for the quality of InSAR interferograms based on phase differences / Z. Li in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 10 (October 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 10 (October 2004) . - pp 1131 - 1137 Titre : A quantitative measure for the quality of InSAR interferograms based on phase differences Type de document : Article/Communication Auteurs : Z. Li, Auteur ; W. Zou, Auteur ; X. Ding, Auteur ; Y. Chen, Auteur ; G. Liu, Auteur Année de publication : 2004 Article en page(s) : pp 1131 - 1137 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] image radar moirée [Termes IGN] phase [Termes IGN] qualité d'image Résumé : (Auteur) It is well-known that interferometric SAR (INSAR) is a technology for the generation of high-precision digital elevation models (DEM) and the precise measurement of terrain surface deformation. The accuracy of DEM and deformation measurement is highly dependent on the quality of the interferogram generated. Such an interferogram is constructed by a pointwise complex multiplication of corresponding pixels in both datasets, which are respectively contained in master image and registered image. An exanimation of existing literature reveals that there is no, good, quantitative measure for the quality of interferograms, and visual inspection is still the best solutions available so far. By visual inspection, one recognizes those interferograms with continuous fringes as good ones and regards those with many discontinuous interferograms and speckles as being not good. As the pixels in the interferogram represent the phase value values, it is natural to think that, if the quality is good, the phase differences between neighbor pixels should be small, and thus the sum of all phase differences will still be small. This leads to the proposal of "sum of phase differences" (SPD) as a quantitative measure for the quality of interferogram. Two simulation tests have been conducted, and the results show that the SPD is a reliable measure. Numéro de notice : A2004-361 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.10.1131 En ligne : https://doi.org/10.14358/PERS.70.10.1131 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26888 [article]

Ground subsidence monitoring in Hong Kong with satellite SAR interferometry / X.L. Ding in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 10 (October 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 10 (October 2004) . - pp 1151 - 1156 Titre : Ground subsidence monitoring in Hong Kong with satellite SAR interferometry Type de document : Article/Communication Auteurs : X.L. Ding, Auteur ; G.X. Liu, Auteur ; Z.W. Li, Auteur ; Z.L. Li, Auteur ; Y.Q. Chen, Auteur Année de publication : 2004 Article en page(s) : pp 1151 - 1156 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] Hong-Kong [Termes IGN] image radar moirée [Termes IGN] interferométrie différentielle [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] risque naturel [Termes IGN] subsidence [Termes IGN] surveillance géologique Résumé : (Auteur) Ground settlement has long been a problem in Hong Kong, as most usable land in Hong Kong was reclaimed from the sea. Ground settlement may affect building structures and underground facilities such as water supply and sewage systems built on the land. Measurements of ground settlement can provide valuable data for assessing the impacts of ground settlement and for improving designs of future land reclamation projects. Experiments have been carried out to assess the performance of INSAR in the environment of Hong Kong especially the temporal decorrelations of SAR images and the potential atmospheric effects on INSAR measurements, and to use INSAR to study the ground settlement problem in Hong Kong. This study finds that the temporal decorrelation is an important problem in the heavily vegetated rugged areas as usually expected, and that the atmospheric effects can be very significant at times. Ground settlements measured over the airport and a residential area are presented. It can be seen from the results that both of the areas are still settling significantly in any years after the reclamation. Numéro de notice : A2004-362 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.10.1151 En ligne : https://doi.org/10.14358/PERS.70.10.1151 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26889 [article]

Applying SAR Interferometry for ground deformation detection in China / C. Wang in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 10 (October 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 10 (October 2004) . - pp 1157 - 1165 Titre : Applying SAR Interferometry for ground deformation detection in China Type de document : Article/Communication Auteurs : C. Wang, Auteur ; H. Zhang, Auteur ; X. Shan, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 1157 - 1165 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] Chine [Termes IGN] déformation de la croute terrestre [Termes IGN] image radar moirée [Termes IGN] interferométrie différentielle [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] milieu urbain [Termes IGN] risque naturel [Termes IGN] séisme [Termes IGN] subsidence [Termes IGN] surveillance géologique Résumé : (Auteur) This paper applies SAR Interferometry for ground deformation in two cases: the 1998 Zhangbei-Shangyi Earthquake in Northern China and the urban subsidence in Suzhou City from 1993 to 2000. It is concluded that SAR interferometry may provide valuable information for understanding the spatial patterns and progress of natural hazards. SAR interferometry is also critical for mechanism studies and hazard mitigation. Numéro de notice : A2004-363 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.10.1157 En ligne : https://doi.org/10.14358/PERS.70.10.1157 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26890 [article]

Landslide monitoring in the Three Gorges area using D-InSAR and corner reflectors / Y. Xia in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 10 (October 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 10 (October 2004) . - pp 1167 - 1172 Titre : Landslide monitoring in the Three Gorges area using D-InSAR and corner reflectors Type de document : Article/Communication Auteurs : Y. Xia, Auteur ; H. Kaufmann, Auteur ; X.F. Guo, Auteur Année de publication : 2004 Article en page(s) : pp 1167 - 1172 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] Chine [Termes IGN] coin réflecteur [Termes IGN] image radar moirée [Termes IGN] interferométrie différentielle [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] mouvement de terrain [Termes IGN] précision centimétrique [Termes IGN] surveillance géologique [Termes IGN] Trois Gorges, barrage des Résumé : (Auteur) The differential INSAR technique has the potential for monitoring centimeter-scale ground motion in an accurate and cost-effective manner. Probably the most important limiting factor in the application of INSAR is temporal change in the complex reflectivity of the ground surface during the period between radar acquisitions. This can be due to changes in such parameters as moisture content or vegetation. The stable artificial corner reflectors can be identified from long temporal series of interferometric SAR images even with large baselines, and therefore decrease the risk of image decorrelation. This paper will discuss the following questions: 1) how to obtain the true phase of a corner reflector in a SAR complex image; 2) how to co-register the corner reflector pixels when the coherence of its surrounding area is extremely low; 3) how to select the interpolation kernel to resample the SAR image; and, 4) how to compute the interferometric phase of two co-registered corner reflectors without flat earth term and corners' height contribution. In order to demonstrate the results, a practical example of landslide monitoring in the Three Gorges area in China is presented. Numéro de notice : A2004-364 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.10.1167 En ligne : https://doi.org/10.14358/PERS.70.10.1167 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26891 [article]

GPS and GIS assisted radar interferometry / Linlin Ge in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 10 (October 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 10 (October 2004) . - pp 1173 - 1177 Titre : GPS and GIS assisted radar interferometry Type de document : Article/Communication Auteurs : Linlin Ge, Auteur ; X. Li, Auteur ; Chris Rizos, Auteur ; M. Omura, Auteur Année de publication : 2004 Article en page(s) : pp 1173 - 1177 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] carrière souterraine [Termes IGN] géoréférencement [Termes IGN] image radar moirée [Termes IGN] interferométrie différentielle [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] mine [Termes IGN] positionnement par GPS [Termes IGN] réflecteur [Termes IGN] subsidence [Termes IGN] surveillance géologique [Termes IGN] Sydney (Nouvelle-Galles du Sud) Résumé : (Auteur) Error in radar satellite orbit determination is a common problem in radar interferometry (INSAR). For example, when we try to locate a radar test site with known geographic coordinates using the geocoding information in SLC (the latitude and longitude of the four image corners), the location is well away from the true position. Another example is when there is a significant disturbance in the differential INSAR result, we sometimes are not sure whether it is from ground deformation or atmospheric heterogeneity. Even after these are corrected, we need to export the INSAR results to a GIS format so that they can be overlaid as layers over orthophotos and mine plans (in the case of mining subsidence) in order to interpret the results. Therefore, it is proposed to use both GPS and GIS to assist radar interferometry. Results are presented with an application to monitoring subsidence due to underground mining southwest of Sydney, Australia. Numéro de notice : A2004-365 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.10.1173 En ligne : https://doi.org/10.14358/PERS.70.10.1173 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26892 [article]