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Evaluation of resolving power and MTF of DMC / Eija Honkavaara 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 17 - 22 Titre : Evaluation of resolving power and MTF of DMC Type de document : Article/Communication Auteurs : Eija Honkavaara, Auteur ; Juha Jaakkola, 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 17 - 22 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] chambre à grand format [Termes IGN] distorsion d'image [Termes IGN] DMC [Termes IGN] fonction de transfert de modulation [Termes IGN] image panchromatique [Termes IGN] instrumentation Z/I Imaging [Termes IGN] pas d'échantillonnage au sol [Termes IGN] pouvoir de résolution géométrique Résumé : (Auteur) The present article reports the results of an extensive empirical evaluation of spatial resolution of a digital large format Intergraph DMC sensor. The parameters of the study were flight direction, ground sample distance (GSD) and the distance from the image center. The key finding of the study was that the resolution of the DMC panchromatic large-format image was clearly dependent on the distance from the image center. One reason for this behavior is that the DMC large-format image is composed of four oblique images; the resolution of the oblique images is reduced towards the image border due to the scale reduction and projective distortion. From the image pixel size of 12 um of DMC, a nominal resolving power value (RP) 84 lines/mm can be derived. Maximal resolution reduction factors in the image comers, caused by the image tilt, were 1.6 in the cross-flight direction and 1.4 in the flight direction. The distance from the image center did not appear to affect the resolution of the low-resolution multi-spectral images looking towards nadir. The observed MTFs indicated attractive behavior. The A WAR values of the panchromatic images were between 61 and 71 lines/mm, which is 1.2-1.4 times the nominal RP-value. Other important findings were the effects of GSD and flight direction on the resolution; these properties evidently characterize the behavior of the entire photogrammetric system tested. The image restoration by a linear restoring finite impulse response filter provided a constant resolution improvement factor of 1.4. Copyright SFPT Numéro de notice : A2006-626 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/PS3-39.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28349 [article]

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Orientation of optical airborne and spaceborne images for small and medium scale mapping purposes / Eija Honkavaara (1999)

Public Titre : Orientation of optical airborne and spaceborne images for small and medium scale mapping purposes Type de document : Rapport Auteurs : Eija Honkavaara, Auteur ; Mirjam Bilker, Auteur ; X. Yu, Auteur ; Juha Jaakkola, Auteur ; Harri Kaartinen, Auteur ; J. Ylonen, Auteur Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 1999 Collection : Reports of the Finnish Geodetic Institute num. 99-5 Importance : 57 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] aérotriangulation [Termes IGN] image aérienne [Termes IGN] image JERS [Termes IGN] image optique [Termes IGN] image spatiale [Termes IGN] orientation d'image [Termes IGN] orientation du capteur [Termes IGN] photographie à moyenne échelle [Termes IGN] photographie à petite échelle [Termes IGN] point d'appui [Termes IGN] point de vérification [Termes IGN] points homologues Index. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Recent technical progress has resulted in significant improvement of the orientation process. The most revolutionary developments include automation of tie point measurement and direct determination of orientation parameters with GPS and INS techniques. Options to be taken into account when selecting materials for mapping and methods for orientation include image type (scale; standard frame, digital camera; spaceborne, airborne), block geometry (single image orientation, aerial triangulation (AT)), ground control (targeted, untargeted, GIS data, etc.), image observations (automatic, interactive) and utilisation of directly measured orientation parameters. The task is to optimise costs, accuracy and reliability. These questions have been investigated at the Finnish Geodetic Institute (FGI) for medium and small scale mapping applications with spatial resolution and accuracy requirements for 15 m. Both theoretical and empirical considerations have been made with respect to several variables: observations of orientation parameters (GPS, no GPS, GPS processing), block structure (cross strips, no cross strips; single image, block), ground control points (GCPs, targeted, untargeted and GIS data: nationwide digital orthophotos, base maps and elevation models), image observations of tie points and GCPs (interactive, automatic) and image material (1:31 000 and 1:60 000 standard airborne images with approximately 1 m and 5 m pixel sizes; JERS/VNIR satellite images). All the airborne cases were analysed using the same strategies and checkpoints. JERSIVNIR images were analysed in parallel with the airborne images, but no comprehensive comparisons between the materials could be made because of large resolution differences. The results of GPS measurements of perspective centres showed offsets and linear drifts varying from strip to strip, but compensation in AT with minimum ground control was possible. Targeted GCPs yielded high accuracy and reliability. Untargeted GCPs and GIS data as ground control, especially digital orthophotos and DEM25, also yielded good accuracy, although care is needed to avoid problems with gross errors. With GIS data, systematic errors can also be expected. The empirical and simulation results obtained make it possible to select GCP materials for obtaining various accuracy levels in the cases of spatial resection and AT with or without GPS support. It was concluded that in block adjustment, a planimetric accuracy of 10 gm in the image and a height accuracy of 0.1%oH can be obtained by using a reasonable number of GCPs (e.g. in 4 base distances) with accuracy better than 20 µm in image. Several examples of suitable GCP materials and configurations for obtaining accuracy better than 1 m were given. High accuracy was obtained with automatic tie point measurement, but investigations are still needed concerning optimal adjustment methods and number of points. The results, however, were in any case sufficient for applications with medium quality requirements. Experiences of orientation of JERS/VNIR images with rigorous methods were good; accuracy of 0.4 pixels was obtained with only 4 GCPs. In all the cases, the results of empirical and theoretical investigations correlated as long as the assumptions were valid; therefore reliable knowledge of the quality of the materials used as the basis for orientation is an important presupposition. Numéro de notice : 67564 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Rapport Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=44680

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Quality of FLPIS land parcel digitization / Harri Kaartinen (1999)

Public Titre : Quality of FLPIS land parcel digitization Type de document : Rapport Auteurs : Harri Kaartinen, Auteur ; A. Huttunen, Auteur ; Risto Kuittinen, Auteur ; Eija Honkavaara, Auteur ; Juha Jaakkola, Auteur Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 1999 Collection : Reports of the Finnish Geodetic Institute num. 99-2 Importance : 26 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] numérisation du cadastre [Termes IGN] qualité Index. décimale : 33.30 Photogrammétrie numérique Numéro de notice : 69563 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Rapport Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=44831

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Quality of FLPIS orthophotos / Eija Honkavaara (1999)

Public Titre : Quality of FLPIS orthophotos Type de document : Rapport Auteurs : Eija Honkavaara, Auteur ; Harri Kaartinen, Auteur ; Risto Kuittinen, Auteur ; A. Huttunen, Auteur ; Juha Jaakkola, Auteur Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 1999 Collection : Reports of the Finnish Geodetic Institute num. 99-1 Importance : 33 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes IGN] erreur moyenne quadratique [Termes IGN] orthoimage [Termes IGN] qualité d'image Index. décimale : 33.50 Orthophotographie, orthoimage Résumé : (Auteur) The Ministry of Agriculture and Forestry of Finland (MAF) initiated a project to develop a countrywide digital orthophoto database in spring 1996. The orthophotos are to be utilized in a system controlling agricultural subsidies. Digital orthophotos covering the whole of Finland (land area 340 000 km) were produced during 1996-1997. The duration of the project was 18 months, including planning, scanning and orthorectification. The Finnish Geodetic Institute (FGI) functioned as an expert and quality control consultant in the project. In this publication the quality specifications and control procedures used in scanning and orthophoto production are given, and geometric and visual quality of the orthophotos produced are evaluated. Quality control was divided into process design, on-line quality control and acceptance sampling. The quality of the orthophotos was investigated in the field areas using a 4%-sample. The root mean square (RMS) point error is less than 1.6 m in the main part of the country, and in most parts of the country the quality requirement for 2.5 m is fulfilled. Interior accuracy is clearly better. Visual quality of the orthophotos, produced from 1:60 000 aerial photographs, is sufficient for control purposes. Furthermore, theoretical considerations on the quality of the digital orthophotos are given. Numéro de notice : 69562 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Rapport Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=44830

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Interpretability of SPOT data for general mapping / E. Ahokas (1990)

Public Titre : Interpretability of SPOT data for general mapping Type de document : Rapport Auteurs : E. Ahokas, Auteur ; Juha Jaakkola, Auteur ; P. Sotkas, Auteur Editeur : Francfort sur le Main : Institut für Angewandte Geodäsie Année de publication : 1990 Collection : Official Publication OEEPE, ISSN 0257-0505 num. 24 Importance : 130 p. Format : 18 x 24 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] image SPOT [Termes IGN] photo-interprétation Index. décimale : 33.40 Photogrammétrie spatiale Numéro de notice : 62424 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Rapport d'étude technique Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61068

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The influence of temperature variations on the photo coordinates in an analytical plotter / A. Hogholen (1990)

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Photogrammetric height determination of gravity points / Juha Jaakkola (1982)

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Radial calibration of a grid for the goniometer / Juha Jaakkola (1980)  

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