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Integration of GPS and remote sensing into GIS: a case study of rectifying satellite imagery using uncorrected coordinates in different scenes / J. Gao in Geocarto international, vol 21 n° 4 (December 2006 - February 2007)  

Public [article]  inGeocarto international > vol 21 n° 4 (December 2006 - February 2007) . - pp 59 - 65 Titre : Integration of GPS and remote sensing into GIS: a case study of rectifying satellite imagery using uncorrected coordinates in different scenes Type de document : Article/Communication Auteurs : J. Gao, Auteur ; Y. Zha, Auteur Année de publication : 2006 Article en page(s) : pp 59 - 65 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] base de données localisées [Termes IGN] carte topographique [Termes IGN] coordonnées GPS [Termes IGN] correction d'image [Termes IGN] géoréférencement [Termes IGN] image Landsat-TM [Termes IGN] image multibande [Termes IGN] image panchromatique [Termes IGN] image SPOT [Termes IGN] limite de résolution géométrique [Termes IGN] point d'appui [Termes IGN] positionnement par GPS [Termes IGN] système d'information géographique Résumé : (Auteur) This paper explores the feasibility of integrating GPS and remote sensing data into a GIS database through rectification of satellite images of both urban and rural areas using uncorrected GPS coordinates. A GPS receiver was used to log the coordinates of 25 ground control points (GCPs) in a rural area and 20 GCPs in an urban area. Their coordinates were also read from topographic maps. Both sets of coordinates were used to rectify Landsat TM, and SPOT panchromatic (PAN) and multispectral (XL) images. It is found that none of the GPS coordinates are able to achieve an acceptable accuracy level of integration unless some inaccurate GCPs are excluded. The percentage of useable GCPs varies from less than 50 to nearly 90, depending on the spatial resolution of the image and the ease of GCP identification. On average, the difficulty in identifying GCPs on the ground and the image degrades integration accuracy by up to one pixel. Copyright Geocarto international Numéro de notice : A2006-587 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040608542403 Date de publication en ligne : 04/01/2008 En ligne : https://doi.org/10.1080/10106040608542403 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28310 [article]

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Knowledge-based approaches to accurate mapping of mangroves from satellite data / J. Gao in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 11 (November 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 11 (November 2004) . - pp 1241 - 1248 Titre : Knowledge-based approaches to accurate mapping of mangroves from satellite data Type de document : Article/Communication Auteurs : J. Gao, Auteur ; H. Chen, Auteur ; Y. Zhang, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 1241 - 1248 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse comparative [Termes IGN] Auckland [Termes IGN] carte de la végétation [Termes IGN] carte thématique [Termes IGN] classificateur paramétrique [Termes IGN] classification à base de connaissances [Termes IGN] classification dirigée [Termes IGN] image SPOT [Termes IGN] littoral [Termes IGN] mangrove [Termes IGN] précision sémantique [Termes IGN] raisonnement spatial Résumé : (Auteur) Mangroves are difficult to map accurately from satellite data by means of parametric classification because of their spectral similarity to other coastal vegetation despite their habitat being inside coastal waters. This study aims to improve the mapping accuracy through incorporation of such spatial knowledge about mangroves in the Waitemata Harbor of Auckland, New Zealand, from SPOT data. The spatial knowledge was combined with spectral knowledge in the mapping. Supervised classification was found to map stunted and lush mangroves at an accuracy of, respectively, 46.7 percent and 68.3 percent. These accuracy levels rose, respectively, to 83.3 percent and 96.7 percent after the spatial knowledge was sequentially incorporated into the mapping. A similar accuracy level was achieved from knowledge-based spatial reasoning. If integrated simultaneously with spectral knowledge, spatial knowledge did not improve the accuracy noticeably because of difficulty in gaining quality spectral knowledge. It is concluded that knowledge-based, post-classification processing considerably improves the accuracy of mapping mangroves over parametric classification. Numéro de notice : A2004-456 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.70.11.1241 En ligne : https://doi.org/10.14358/PERS.70.11.1241 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26976 [article]

Image calibration to like-values in mapping shallow water quality from multitemporal data / M.A.. Islam in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 5 (May 2003)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 5 (May 2003) . - pp 567 - 575 Titre : Image calibration to like-values in mapping shallow water quality from multitemporal data Type de document : Article/Communication Auteurs : M.A.. Islam, Auteur ; J. Gao, Auteur ; D. Neil, Auteur ; P. Bell, Auteur Année de publication : 2003 Article en page(s) : pp 567 - 575 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] classification dirigée [Termes IGN] étalonnage radiométrique [Termes IGN] image Landsat-TM [Termes IGN] image multitemporelle [Termes IGN] modèle stochastique [Termes IGN] qualité des eaux Résumé : (Auteur) The applicability of image calibration to likevalues in mapping water quality parameters from multitemporal images is explored. Six sets of water samples were collected at satellite overpasses over Moreton Bay, Brisbane, Australia. Analysis of these samples reveals that waters in this shallow bay are mostly TSS dominated, even though they are occasionally dominated by chlorophyll as well. Three of the images were calibrated to a reference image based on invariant targets. Predictive models constructed from the reference image were applied to estimating total suspended sediment (TSS) and Secchi depth from another image at a discrepancy of around 35 percent. Application of the predictive model for TSS concentration to another image acquired at a time of different water types resulted in a discrepancy of 152 percent. Therefore, image calibration to likevalues could be used to reliably map certain water quality parameters from multitemporal TM images so long as the water type under study remains unchanged. This method is limited in that the mapped results could be rather inaccurate if the water type under study has changed considerably. Thus, the approach needs to be refined in shallow water from multitemporal satellite imagery. Numéro de notice : A2003-084 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1016/S0034-4257(01)00205-X En ligne : http://dx.doi.org/10.1016/S0034-4257(01)00205-X Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22380 [article]

Integration of GPS with remote sensing and GIS: reality and prospect / J. Gao in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 5 (Mai 2002)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 5 (Mai 2002) . - pp 447 - 453 Titre : Integration of GPS with remote sensing and GIS: reality and prospect Type de document : Article/Communication Auteurs : J. Gao, Auteur Année de publication : 2002 Article en page(s) : pp 447 - 453 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] acquisition de données [Termes IGN] cartographie animée [Termes IGN] environnement [Termes IGN] Global Positioning System [Termes IGN] intégration de données [Termes IGN] prospective [Termes IGN] système d'information géographique Résumé : (Auteur) The advent of the Global Positioning System (GPS) technology bus not only enhanced the ease and versatility of spatial data acquisition, but has also diversified the approaches by which it is integrated with remote sensing and geographic information systems (GISs). In this paper the necessity of integrating GPS, remote sensing, and GIS is discussed following their definition. The current status of integration is reviewed under four proposed models: linear, interactive, hierarchical, and complex. Applications of integration are reviewed under three categories: resources management and environmental monitoring, emergency response, and mobile mapping. This paper reveals that linear integration is the most common. Hierarchical integration has found applications in precision farming and environmental modeling. The complex mode of integration is most valuable in diaster mitigation, emergency response, and mobile mapping. With limited cases in hierarchical and complex models, the full potential of integration has not been achieved. The prospects of integration are distributed mobile GISs and location-aware .multi-media digital personal assistants. As mobile communications technologies improve, full integration will find more applications in many new fields after removal of the obstacles in integration. Numéro de notice : A2002-103 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://people.brandonu.ca/wiseman/files/2013/09/Gao-PERS-2002-IGIS1.pdf Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22018 [article]