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Data fusion of high-resolution satellite imagery and Lidar data for automatic building extraction / Gunho Sohn in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 1 (May 2007)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 62 n° 1 (May 2007) . - pp 43 - 63 Titre : Data fusion of high-resolution satellite imagery and Lidar data for automatic building extraction Type de document : Article/Communication Auteurs : Gunho Sohn, Auteur ; Ian J. Dowman, Auteur Année de publication : 2007 Article en page(s) : pp 43 - 63 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] ALTM [Termes IGN] arbre BSP [Termes IGN] détection du bâti [Termes IGN] données lidar [Termes IGN] espace objet [Termes IGN] extraction automatique [Termes IGN] fusion de données multisource [Termes IGN] image Ikonos [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] polygone [Termes IGN] semis de points [Termes IGN] spatial metrics Résumé : (Auteur) This paper aims to present a new approach for automatic extraction of building footprints in a combination of the IKONOS imagery with pan-sharpened multi-spectral bands and the low-sampled (not, vert, similar 0.1 points/m2) airborne laser scanning data acquired from the Optech's 1020 ALTM (Airborne Laser Terrain Mapper). Initially, a laser point cluster in 3D object space was recognized as an isolated building object if all the member points were similarly attributed as building points by investigating the height property of laser points and the normalized difference vegetation indices (NDVI) driven from IKONOS imagery. As modelling cues, rectilinear lines around building outlines collected by either data-driven or model-driven manner were integrated in order to compensate the weakness of both methods. Finally, a full description of building outlines was accomplished by merging convex polygons, which were obtained as a building region was hierarchically divided by the extracted lines using the Binary Space Partitioning (BSP) tree. The system performance was evaluated by objective evaluation metrics in comparison to the Ordnance Survey's MasterMap®. This evaluation showed the delineation performance of up to 0.11 (the branching factor) and the detection percentage of 90.1% (the correctness) and the overall quality of 80.5%. Copyright ISPRS Numéro de notice : A2007-214 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.01.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.01.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28577 [article]

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Examining the influence of changing laser pulse repetition frequencies on conifer forest canopy returns / Laura Chasmer in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 12 (December 2006)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 12 (December 2006) . - pp 1359 - 1367 Titre : Examining the influence of changing laser pulse repetition frequencies on conifer forest canopy returns Type de document : Article/Communication Auteurs : Laura Chasmer, Auteur ; Christopher Hopkinson, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1359 - 1367 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] ALTM [Termes IGN] canopée [Termes IGN] données lidar [Termes IGN] données multitemporelles [Termes IGN] forêt boréale [Termes IGN] fréquence [Termes IGN] impulsion laser [Termes IGN] lasergrammétrie [Termes IGN] onde radioélectrique [Termes IGN] Pinophyta [Termes IGN] surface du sol [Termes IGN] télémétrie laser aéroporté [Termes IGN] vibration Résumé : (Auteur) The distribution of laser pulses within conifer forest trees and canopies are examined by varying the rate of laser pulse emission and the inherent laser pulse properties (laser pulse energy, pulse width, pulse length, and roll-over or trigger time). In this study, an Optech, Inc. ALTM 3100 airborne lidar is used, emitting pulses at 50 kHz and 100 kHz, allowing for changes in laser pulse characteristics while also keeping all other survey parameters equal. We found that: 1. Pulses and associated characteristics emitted at 50 kHz penetrated further into the canopy than 100 kHz for a significant number of individual trees. 2. At tall tree plots with no understory, pulses emitted at 50 kHz penetrated further into the canopy than 100 kHz for a significant number of plots. 3. For plots with significant understory and shorter trees, pulses emitted at 100 kHz penetrated further into the canopy than 50 kHz. We suspect that this may be due, in part, to canopy openness. Laser pulse energy and character differences associated with different laser pulse emission frequencies are likely a contributing factor in laser pulse penetration through the canopy to the ground surface. Efforts to understand laser pulse character influences on canopy returns are important as biomass and vegetation structure models derived from lidar are increasingly adopted. Copyright ASPRS Numéro de notice : A2006-544 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.72.12.1359 En ligne : https://doi.org/10.14358/PERS.72.12.1359 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28267 [article]

Geometric validation of imagery and products from a high performance airborne digital sensor / Jon P. Mills in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 81 - 85 Titre : Geometric validation of imagery and products from a high performance airborne digital sensor Type de document : Article/Communication Auteurs : Jon P. Mills, Auteur ; S. Alhamlan, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 81 - 85 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] ADS40 [Termes IGN] ALTM [Termes IGN] compensation par bloc [Termes IGN] compensation par faisceaux [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] géoréférencement [Termes IGN] image aérienne [Termes IGN] modèle numérique de surface [Termes IGN] point d'appui [Termes IGN] précision géométrique (imagerie) [Termes IGN] qualité géométrique (image) Résumé : (Auteur) This paper describes a geometric evaluation of the photogrammetric workflow resulting from an experimental aerial survey performed using a Leica Airborne Digital Sensor (ADS40) system. Imagery of a 13 km2 study area in the United Kingdom was captured using an ADS40. The study area was flown with the ADS40 at four different altitudes with resulting imagery at ground sampled distances of 15, 20, 25 and 30 cm. Ground points, comprising natural features distributed throughout the study area, were surveyed using GPS methods. In addition, RC30 film imagery and data from a lidar survey conducted using an Optech ALTM 2050 airborne laser scanner was also available for use in validation. The ADS40 imagery of the study area was processed using standard commercial software and a number of tests were conducted to geometrically assess the photogrammetric performance of imagery from the sensor at various stages throughout the photogrammetric workflow. Experiments examined the influence of ground control points (GCPs) in bundle block adjustment and the performance of digital elevation models (DEMs) resulting from the processing of ADS40 imagery. This independent research has permitted a series of initial conclusions to be drawn and preliminary recommendations to be made for optimum deployment of the ADS40 sensor under certain operational conditions. For example, it is shown that, despite advances made in direct positioning and orientation using integrated satellite and inertial surveying, the importing of GCPs into the block adjustment process remains a critical issue influencing the achievable accuracy during photogrammetric measurement. Copyright SFPT Numéro de notice : A2006-631 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/PS3-34.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28354 [article]

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018-06031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Calibration of the optech ALTM-3100 laser scanner intensity data using brightness targets / E. Ahokas in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 182 (Juin 2006) . - pp 10 - 16 Titre : Calibration of the optech ALTM-3100 laser scanner intensity data using brightness targets Type de document : Article/Communication Auteurs : E. Ahokas, Auteur ; S. Kaasalainen, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 10 - 16 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] ALTM [Termes IGN] angle d'incidence [Termes IGN] angle de visée [Termes IGN] caméra numérique [Termes IGN] correction atmosphérique [Termes IGN] étalonnage en vol [Termes IGN] étalonnage géométrique [Termes IGN] étalonnage radiométrique [Termes IGN] Lidar [Termes IGN] point d'appui [Termes IGN] rapport signal sur bruit [Termes IGN] test de performance Résumé : (Auteur) In this paper the calibration of Optech ALTM 3100 laser scanner intensity is reported using airborne experiments and known brightness targets. The Finnish Geodetic Institute has had a permanent photogrammetric test field in Sjokulla Kirkkonummi since 1994. This test field contains permanent and transportable test targets for radiometric calibration, permanent ground control points for small, medium and large-scale geometric calibration and also test bar targets for spatial analysis of analogue and digital aerial cameras. Since 2000 LiDAR testing has also been carried out, the latest being Optech ALTM 3100 campaign in 12-14 July 2005. Eight portable brightness targets with nominal reflectance of 5 %, 10 %, 20 %, 25 %, 30 %, 45 %, 50 % and 70 % were in use for LiDAR testing. Flying heights were about 200, 1000 and 3000 m above ground level. Intensity values need to be corrected with respect to range, incidence angle (both BRDF and range correction), atmospheric transmittance, attenuation using dark object addition and transmitted power (because difference in PRF will lead to different transmitter power values). After these corrections, the intensity values were directly relative to target reflectance. Flight heights of 200 m and 1000 m are suitable for intensity calibration using artificial test targets due to the practical aspects of the calibration (size of the calibrator). With the 3000 m altitude signals with reflectance of less or equal of 10% could not be recorded most probably due to insufficient signal-to-noise ratio. Thus, the test target reflectance should exceed 10% to give a reliable distance measurement from 3000 m altitude. Numéro de notice : A2006-618 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/T03-11.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28341 [article]

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018-06021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Performance analysis of ALTM 3100EA: instrument specifications and accuracy of Lidar data / R.V. Ussyshkin in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 182 (Juin 2006) . - pp 66 - 72 Titre : Performance analysis of ALTM 3100EA: instrument specifications and accuracy of Lidar data Type de document : Article/Communication Auteurs : R.V. Ussyshkin, Auteur ; B. Smith, Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 66 - 72 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] ALTM [Termes IGN] capteur aérien [Termes IGN] données lidar [Termes IGN] instrumentation Optech [Termes IGN] précision des données [Termes IGN] précision des mesures [Termes IGN] spécification de produit [Termes IGN] test de performance Résumé : (Auteur) Over the last decade the number of airborne lidar systems currently deployed and operating in the field has grown impressively. This growth has intensified the level of competition among lidar equipment manufacturers. As manufacturers vie for increased market share with claims of ever higher accuracy specifications, lidar end users wonder how these specifications actually affect achievable accuracy of the lidar data. Aware of the interest that professional organizations such as ISPRS/ASPRS have shown in establishing quality control guidelines for reporting accuracy in lidar data, Optech Incorporated, a leading manufacturer of airborne lidar equipment, conducted a series of studies that examined issues that included, among others, vertical accuracy and Position and Orientation System (POS) performance. Since accuracy specifications can be the product of different testing methodologies and subject to the interpretation of data, the final arbiter of competing claims is actual system performance. The studies that Optech carried out included performance analyses of the ALTM 31OOEA laser mapping system. This instrument demonstrated that it is capable of producing mapping data with relative accuracies on the sub-decimeter level. However, the limiting factors in obtaining overall absolute sub-decimeter accuracies are often due to the performance of various subsystems that contribute to the total ALTM error budget. This paper represents the manufacturer's effort to relate the engineering analysis of instrument performance to what is demonstrably achievable accuracy in the lidar data of end users. Copyright SFPT Numéro de notice : A2006-623 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/PS2-28.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28346 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
018-06021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A robust method for filtering non-ground measurements from airborne Lidar data / F. Crosilla in GIS Geo-Informations-Systeme, vol 2004 n° 12 (Dezember 2004)

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Accuracy of airborne lidar derived elevation: empirical assessment and error budget / M.E. Hodgson in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 3 (March 2004)  

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