Photogrammetrie Fernerkundung Geoinformation最新文献

{"title":"Image Quality Assessment of Pléiades-1A Triplet Bundle and Pan-sharpened Images","authors":"K. Jacobsen, H. Topan, A. Cam, Mustafa Özendi, M. Oruc","doi":"10.1127/PFG/2016/0291","DOIUrl":"https://doi.org/10.1127/PFG/2016/0291","url":null,"abstract":"The image quality of Pléiades-1A panchromatic and multispectral as well as pan-sharpened images has been analyzed. The original images are available with 12 bit radiometric resolution, but for mapping purposes often this is reduced to 8 bit, corresponding to the grey value resolution of the computer screens. Therefore, original images as well as the 8 bit images were investigated. Pléiades images are distributed with 50 cm ground sampling distance (GSD) in spite of the original resolution with 70 cm GSD. For this the effective image quality was determined by edge analysis. The edge analysis can be influenced by image sharpening. An image sharpening usually enlarges the image noise, which however can be reduced by filtering. This can influence the presentation of small image details, so in addition to edge and noise analysis image details in the Pléiades images were compared with the details visible in satellite images taken by other sensors having similar ground resolution. A blur analysis did not improve the information about image quality. In the Zonguldak test site (Turkey) Pléiades images are compared with WorldView-1-, QuickBirdand IKONOS-images. The zooming from 70 cm to 50 cm GSD could not be identified by the investigation of the Pléiades image quality. It leads to an even better quality than of the WorldView-1and QuickBird images with an originally higher resolution. Zusammenfassung: Bildqualität von Triplet Bundle und Pan-sharpened Bildern des Systems Pléiades-1A. Die Bildqualität von panchromatischen, multispektralen und pan-geschärften Pléiades-1A Bildern wurde untersucht. Die Originalbilder haben eine radiometrische Auflösung von 12 bit, für die Kartenerstellung werden sie jedoch häufig auf 8 bit reduziert, weswegen sowohl die Originalbilder als auch 8-bit-Bilder analysiert wurden. Pléiades-Bilder werden mit 50 cm Objektpixelgröße ausgeliefert, obwohl die geometrische Auflösung nur 70 cm beträgt. Aus diesem Grund war eine Untersuchung der Bildqualität mittels Kantenanalyse erforderlich. Die Kantenanalyse kann durch Bildschärfung beeinflusst werden. Dieses erhöht normalerweise das Bildrauschen. Das Bildrauschen lässt sich durch Filterung reduzieren, was wiederum die Erkennbarkeit kleiner Bilddetails verschlechtern kann. Aus diesem Grund wurde auch das Bildrauschen untersucht. Eine blur-Untersuchung verbesserte die Information über die Bildqualität nicht. Von dem Testgebiet Zonguldak, Türkei, sind auch WorldView-1-, QuickBirdund IKONOS-Bilder vorhanden, die einen Vergleich von Bilddetails ermöglichen. Die Vergrößerung der Pléiades-Bilder von 70 cm auf 50 cm Objektpixelgröße konnte nicht durch eine reduzierte Bildqualität nachgewiesen werden. Vielmehr waren die Pléiades-Bilder sogar qualitativ besser als die WorldView-1und die QuickBird-Bilder, die eine höhere geometrische Auflösung besitzen.","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"145 1","pages":"141-152"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87965452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using Digital Aerial Photogrammetry and the Random Forest Approach to Model Forest Inventory Attributes in Beech- and Spruce-dominated Central European Forests","authors":"C. Straub, C. Stepper","doi":"10.1127/PFG/2016/0292","DOIUrl":"https://doi.org/10.1127/PFG/2016/0292","url":null,"abstract":"","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"193 1","pages":"109-123"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75840563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tri-Stereo Model Orientation of High-Resolution Satellite Imagery Combining Ground Control Points and Lines","authors":"Jinshan Cao, Xiuxiao Yuan, Yi Fang","doi":"10.1127/PFG/2016/0293","DOIUrl":"https://doi.org/10.1127/PFG/2016/0293","url":null,"abstract":"","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"40 1","pages":"125-140"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89606248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Comparison of UAV- and TLS-derived Plant Height for Crop Monitoring: Using Polygon Grids for the Analysis of Crop Surface Models (CSMs)","authors":"G. Bareth, J. Bendig, N. Tilly, D. Hoffmeister, H. Aasen, A. Bolten","doi":"10.1127/PFG/2016/0289","DOIUrl":"https://doi.org/10.1127/PFG/2016/0289","url":null,"abstract":"","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"35 1","pages":"85-94"},"PeriodicalIF":0.0,"publicationDate":"2016-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78017452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dense Image Matching vs. Airborne Laser Scanning – Comparison of two methods for deriving terrain models","authors":"C. Ressl, Herbert Brockmann, G. Mandlburger, N. Pfeifer","doi":"10.1127/PFG/2016/0288","DOIUrl":"https://doi.org/10.1127/PFG/2016/0288","url":null,"abstract":"","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"1 1","pages":"57-73"},"PeriodicalIF":0.0,"publicationDate":"2016-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76197034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Incidence Angle Dependency of Leaf Vegetation Indices from Hyperspectral Lidar Measurements","authors":"S. Kaasalainen, O. Nevalainen, T. Hakala, K. Anttila","doi":"10.1127/PFG/2016/0287","DOIUrl":"https://doi.org/10.1127/PFG/2016/0287","url":null,"abstract":"We have studied the effect of incidence angle on the spectral content of leaf measurements from hyperspectral light detection and ranging (lidar) data. New results obtained for different ornamental plant leaves indicate that their backscatter properties do not follow the Lambert scattering law, especially in the visible wavelength range: specular reflections were observed near the normal incidence. Also the vegetation spectral indices, such as normalized difference vegetation index (NDVI), or even the simple ratios may change with the laser incidence angle to the target. The reason for this is the difference in their backscatter vs. intensity behaviour between visible and near-infrared (NIR) wavelengths. In comparison with earlier results it turns out that this phenomenon seems to depend on the internal structure and surface properties of leaves. Further information on the extent and role of this effect for different leaves is needed, but our results indicate that the nature of laser reflection in tree canopies may vary between species. The calibration of hyperspectral lidar vegetation reflectance measurements must be further studied by rigorous experiments and modelling. Zusammenfassung: Abhängigkeit von Vegetationsindices für Blätter vom Inzidenzwinkel aus hyperspektralen Laserscanner-Messungen. In diesem Beitrag wird der Einfluss des Einfallswinkels auf spektrale Indices, welche aus hyperspektralen Laserscanner-Messungen von Blättern abgeleitet werden, untersucht. Neue Ergebnisse für Blätter von verschiedenen Zierpflanzen zeigen, dass deren Rückstreuverhalten vor allem im sichtbaren Bereich des elektromagnetischen Spektrums nicht dem eines Lambertschen Strahlers entspricht: Bei genähert senkrechter Einfallrichtung wurde gerichtete Reflexion beobachtet. Auch spektrale Vegetationsindices wie z. B. der Normalized Difference Vegetation Index (NDVI) oder auch nur einfache Verhältnisse können sich mit dem Einfallswinkel des Laserstrahls ändern. Der Grund dafür ist ein unterschiedliches Rückstreuverhalten im sichtbaren Bereich bzw. im nahen Infrarot. Im Vergleich mit früheren Ergebnissen scheint dieses Phänomen von der inneren Struktur und den Oberflächeneigenschaften der Blätter abzuhängen. Während tiefergehende Untersuchungen zum Ausmaß und zur Rolle dieses Effekts noch ausstehen, weisen unsere Ergebnisse darauf hin, dass die Art der Laserreflexion für unterschiedliche Spezies variieren könnte. Die Kalibrierung von Reflexionsgraden aus multispektralen Laserscanner-Messungen erfordert weitere Studien in Hinblick auf eine strenge Modellierung und experimentelle Validierung.","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"39 1","pages":"75-84"},"PeriodicalIF":0.0,"publicationDate":"2016-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85565691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Automatic Generation of Orthorectified High Resolution Satellite Imagery – a Case Study for Saudi Arabia","authors":"M. Alrajhi, C. Heipke","doi":"10.1127/pfg/2016/0285","DOIUrl":"https://doi.org/10.1127/pfg/2016/0285","url":null,"abstract":"","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"16 1","pages":"5-15"},"PeriodicalIF":0.0,"publicationDate":"2016-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87513530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy analysis of photogrammetric UAV image blocks: influence of onboard RTK-GNSS and cross flight patterns","authors":"M. Gerke, H.-J. Przybilla","doi":"10.1127/PFG/2016/0284","DOIUrl":"https://doi.org/10.1127/PFG/2016/0284","url":null,"abstract":"Unmanned aerial vehicles (UAV) are increasingly used for topographic mapping. Despite the flexibility gained when using those devices, one has to invest more effort for ground control measurements compared to conventional photogrammetric airborne data acquisition, because positioning devices on UAVs are generally less accurate. Additionally, the limited quality of employed end-user cameras asks for self-calibration, which might cause some problems as well. A good distribution of ground control points (GCPs) is not only needed to solve for the absolute orientation of the image block in the desired coordinate frame, but also to mitigate block deformation effects which are resulting mainly from remaining systematic errors in the camera calibration. In this paper recent developments in the UAV-hardware market are picked up: some providers equip fixed-wing UAVs with RTK-GNSS-enabled 2-frequency receivers and set up a processing pipeline which allows them to promise an absolute block orientation in a similar accuracy range as through traditional indirect sensor orientation. Besides the analysis of the actually obtainable accuracy, when one of those systems is used, we examine the effect different flight directions and altitudes (cross flight) have onto the bundle adjustment. For this purpose two test areas have been prepared and flown with a fixed-wing UAV. Results are promising: not only the absolute image orientation gets significantly enhanced when the RTK-option is used, also block deformation is reduced. However, remaining offsets originating from time synchronization or camera event triggering should be considered during flight planning. In flat terrains a cross flight pattern helps to enhance results because of better and more reliable self-calibration.","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"85 1","pages":"17-30"},"PeriodicalIF":0.0,"publicationDate":"2016-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77698915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation Criteria for Recent LoD Proposals for City-GML Buildings","authors":"Marc-O. Löwner, G. Gröger","doi":"10.1127/PFG/2016/0283","DOIUrl":"https://doi.org/10.1127/PFG/2016/0283","url":null,"abstract":"for emergency driving training (Randt et al. 2007). Some application areas such as emergency management (Zlatanova & li 2008) or indoor navigation (BeckeR et al. 2009) even require information of the building’s interior on a city level. These models may vary with regard to geometrical and semantical complexity and to the degree of deviation from the corresponding real world objects. Complexity levels then are the result of specific data acqui","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"1 1","pages":"31-43"},"PeriodicalIF":0.0,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87794248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bi-temporal Change Detection, Change Trajectories and Time Series Analysis for Forest Monitoring","authors":"Frank Thonfeld, Antje Hecheltjen, G. Menz","doi":"10.1127/PFG/2015/0259","DOIUrl":"https://doi.org/10.1127/PFG/2015/0259","url":null,"abstract":"","PeriodicalId":56096,"journal":{"name":"Photogrammetrie Fernerkundung Geoinformation","volume":"41 1","pages":"129-141"},"PeriodicalIF":0.0,"publicationDate":"2015-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89503868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}