Approximate direct georeferencing in national coordinates

Legat, Klaus

doi:10.1016/j.isprsjprs.2006.02.004

Cited by 27 publications

(13 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be achieved using, for example, the Online Positioning User Service (OPUS) to tie GPS positions collected using an antenna and local base station to the U.S. National Spatial Reference System from nearby Continuously Operating Reference Stations (http://www.ngs.noaa.gov/OPUS/). mobile direct methods are based on the exterior orientation of the sensor relative to the Earth, which can be obtained using GPS and an Internal Navigation System (INS)(Legat, 2006). Geodetic coordinates of po-780 sitions in the scene are extrapolated from sensor x -y positions and altitudes.…”

mentioning

confidence: 99%

Analyzing high resolution topography for advancing the understanding of mass and energy transfer through landscapes: A review

Passalacqua

Belmont

Staley

et al. 2015

Earth-Science Reviews

283

245

View full text Add to dashboard Cite

International audienceThe study of mass and energy transfer across landscapes has recently evolved to comprehensive considerations acknowledging the role of biota and humans as geomorphic agents, as well as the importance of small-scale landscape features. A contributing and supporting factor to this evolution is the emergence over the last two decades of technologies able to acquire high resolution topography (HRT) (meter and sub-meter resolution) data. Landscape features can now be captured at an appropriately fine spatial resolution at which surface processes operate; this has revolutionized the way we study Earth-surface processes. The wealth of information contained in HRT also presents considerable challenges. For example, selection of the most appropriate type of HRT data for a given application is not trivial. No definitive approach exists for identifying and filtering erroneous or unwanted data, yet inappropriate filtering can create artifacts or eliminate/distort critical features. Estimates of errors and uncertainty are often poorly defined and typically fail to represent the spatial heterogeneity of the dataset, which may introduce bias or error for many analyses. For ease of use, gridded products are typically preferred rather than the more information-rich point cloud representations. Thus many users take advantage of only a fraction of the available data, which has furthermore been subjected to a series of operations often not known or investigated by the user. Lastly, standard HRT analysis work-flows are yet to be established for many popular HRT operations, which has contributed to the limited use of point cloud data.In this review, we identify key research questions relevant to the Earth-surface processes community within the theme of mass and energy transfer across landscapes and offer guidance on how to identify the most appropriate topographic data type for the analysis of interest. We describe the operations commonly performed from raw data to raster products and we identify key considerations and suggest appropriate work-flows for each, pointing to useful resources and available tools. Future research directions should stimulate further development of tools that take advantage of the wealth of information contained in the HRT data and address the present and upcoming research needs such as the ability to filter out unwanted data, compute spatially variable estimates of uncertainty and perform multi-scale analyses. While we focus primarily on HRT applications for mass and energy transfer, we envision this review to be relevant beyond the Earth-surface processes community for a much broader range of applications involving the analysis of HRT

show abstract

mentioning

confidence: 99%

Analyzing high resolution topography for advancing the understanding of mass and energy transfer through landscapes: A review

Passalacqua

Belmont

Staley

et al. 2015

Earth-Science Reviews

283

245

View full text Add to dashboard Cite

show abstract

“…• The 'approximate method', which despite its name provides residual distortions at sub-centimetre level (in most flight scenarios) and regardless of the terrain characteristics (Legat, 2006). Its choice is especially advantageous if (a) the point registration is requested in the national coordinates, (b) the ratio scanner versus trajectory sampling is relatively high.…”

Section: Real-time Point Cloud Generationmentioning

confidence: 99%

Real-time registration of airborne laser data with sub-decimeter accuracy

Skaloud

Schaer

Stebler

et al. 2010

ISPRS Journal of Photogrammetry and Remote Sensing

View full text Add to dashboard Cite

“…Nevertheless, there is a distortion of γ in vertical direction due to the meridian deviation. [10] Therefore, in order to correct the effects of meridian deviation on angles, the coordinate system has to be rotated γ around Z m axis.…”

Section: Fig2 Meridian Convergencementioning

confidence: 99%

“…(3) Transformation of the exterior orientation elements: only the exterior orientation elements are transformed, and the scene restitution is carried out directly in the national coordinate system. [10] Within three transformation methods, the third one is the most practical. However, the effects of the earth curvature and map projection on transformation have to be taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Transformation method of exterior orientation angular elements obtained via position and orientation system under Gauss-Kruger projection coordinate system

Yuan

Zhang

2010

Geo-spatial Information Science

View full text Add to dashboard Cite

Data obtained via airborne position and orientation system (POS) is in WGS 84 global geocentric reference frame, while the national coordinate reference system for topographic mapping in China is generally Gauss-Kruger projection coordinate system. Therefore, data obtained via a POS must be transformed to national coordinate system. Owing to the effects of earth curvature and meridian deviation, there are some errors in the process of angle transformation from roll, pitch, and heading ( , , ) Φ Θ Ψ obtained directly via a POS to the attitude angles of images ( , , ) ϕ ω κ needed in photogrammetry. On the basis of effect theories of earth curvature and meridian deviation on exterior orientation angular elements of images, a method using a compensation matrix to correct the transformation errors from attitude angles obtained via the POS to exterior orientation angular elements of images is proposed in this paper.Moreover, the rigorous formula of the compensation matrix is deduced. Two sets of actual data obtained via a POS AV 510, which are different in scale and terrain, are selected and used to perform experiments. The empirical results not only indicate that the compensation matrix proposed in this paper is correct and practical but also show that transformation accuracy of exterior orientation angular elements obtained via the POS based on compensation matrix is relevant to the selection of vertical axis (a projection of central meridian) of Gauss-Kruger projection coordinate system; the proper vertical axis should be the Gauss-Kruger projection of the central meridian of projection zone in which the survey area locates. However, the transformation accuracy of exterior orientation angular elements is irrelevant to the choice of origin of coordinate system; it is appropriate that the origin of coordinate system locates at the center point of the survey area. Moreover, transformation accuracy of exterior orientation angular elements achieved based on the compensation matrix deduced in this paper is higher than that obtained via the existing POS processing software.

show abstract

Approximate direct georeferencing in national coordinates

Cited by 27 publications

References 3 publications

Analyzing high resolution topography for advancing the understanding of mass and energy transfer through landscapes: A review

Analyzing high resolution topography for advancing the understanding of mass and energy transfer through landscapes: A review

Real-time registration of airborne laser data with sub-decimeter accuracy

Transformation method of exterior orientation angular elements obtained via position and orientation system under Gauss-Kruger projection coordinate system

Contact Info

Product

Resources

About