Computing Helmert transformations

Watson, G. A.

doi:10.1016/j.cam.2005.06.047

Cited by 92 publications

(60 citation statements)

References 3 publications

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“…Az elcsavarodás miatt az alappontokról mért részletpontokat egy β szöggel el kellett forgatni, hogy az eredeti pozíciókat kapjuk vissza. A részletpontok pozíciójának javítása Helmert transzformációval történt (Watson 2006). Az eltolás vektora a Field-Map és a referenciamérés különbségéből származott (ΔX; ΔY).…”

Section: Táblázat: a Terepen Felvett Adatok öSszefoglalásaunclassified

Faállomány-szerkezeti kutatások a Roth emlékerdőben

Molnár¹,

Iván²,

Czimber³

et al. 2016

Erdészettudományi Közlemények

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KivonatA szálalóerdők kialakítása során elengedhetetlen az erdő szerkezetében bekövetkező változások ismerete. Roth Gyula 1936-ban kezdett kísérletének területén, a Sopron 182 B szálaló üzemmódú erdőrészletben végeztünk részletes törzstér-képezést. Legfőbb célunk egy olyan adatbázis létrehozása volt, amely a későbbiek folyamán alapot szolgáltathat idősoros elemzésekhez. Mindehhez egy olyan felvételi eljárást dolgoztunk ki, amely megfelelő pontosságú törzstérkép készítésére alkalmas. A kapott adatbázist felhasználva 3D modellt készítettünk a felvett faegyedekről, majd vizsgáltuk az erdőállomány struktúráját. A kísérlet eltelt évtizedei során a fafaj-összetétel a bükk dominanciája felé tolódott el, a fényigényesebb fafajok koronái csak a felsőbb szintekben találhatók meg. Ezzel szemben az átmérő-és magasságeloszlás igen változatos, az erdőrészlet egyes részein már a szálalóerdők jellegzetességeit, míg máshol a differenciálódás kezdeti szakaszait mutatják.Kulcsszavak: szálaló üzemmód, szálalás, erdőszerkezet, törzstérkép INVESTIGATIONS ON STAND STRUCTURE IN THE ROTH MEMORIAL FOREST AbstractDuring transformation of even-aged forests to selection forests it is important to follow the changes in stand structure. Detailed forest mapping was made in Sopron 182 B experimental selection forest, where the research was started by Roth Gyula in 1936. The main purpose of the survey was to create a database which can be used for timeline analysis in the future. We developed a survey method which is accurate enough to generate spatial forest stand databases. We made a 3D model of the forest and examined it's structure. During the decades of the experiment beech became dominant, lightdemanding tree species withdrew to upper canopy regions. Diameter and height distribution is heterogeneous, in some areas it shows the characteristic of selection or structurally differentiated forests.

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Section: Táblázat: a Terepen Felvett Adatok öSszefoglalásaunclassified

Faállomány-szerkezeti kutatások a Roth emlékerdőben

Molnár¹,

Iván²,

Czimber³

et al. 2016

Erdészettudományi Közlemények

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“…Bedrock is made of Cretaceous to Miocene sandstone flysch and clayshales, while the landslide body is made of clay, silt and blocks forming a deposit with a detrital texture and a matrix supported fabric whose maximum thickness is about 30 m. Despite its prehistoric origin [Bertolini et al, 2005], the landslide resumed activity several times during the last 60 years and has been seasonally active from 2001 to date [Ronchetti et al, 2007]. The geomorphic evolution of the slope was particularly relevant in winter-spring 2001, 2006and 2009[Corsini et al, 2009Sterzai et al, 2010]. In these years, total reactivations of the landslide were triggered by 150 to 350 mm of rainfall in periods ranging from 3 to 40 days [Daehne, 2011].…”

Section: Case Study Settingsmentioning

confidence: 99%

“…It is known that transformation of data from one coordinate framework into another might introduce errors and reduce the accuracy of results [Watson, 2006]. It is therefore advisable to process and correct measurements of each individual instrument by using its own reference framework and then to transform the computed displacement results from one reference framework to another.…”

Section: Stability Of Ats Control Prismsmentioning

confidence: 99%

Multi-sensors integrated system for landslide monitoring: critical issues in system setup and data management

Castagnetti

Bertacchini

Corsini

et al. 2013

European Journal of Remote Sensing

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This paper discusses critical issues related to the reliability of topographic monitoring systems such as ATS (Automated Total Stations), GNSS (Global Navigation Satellite System) and Ground Based InSAR focusing the attention on controlling the stability of networks infrastructure, which have influence on data correction procedures but are often taken for granted, and on integrating results in GIS (Geographic Information System), under a common reference framework and with respect to open-access ancillary data. The novelty of the paper lies in the demonstration of the efficiency obtained by a proper implementation of the system. Discussion makes reference to an active landslide by using ATS, GNSS and Ground Based InSAR in continuous and periodic mode.

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“…by Friedrich Robert Helmert (18431917), director of Potsdam geodetic institute and Professor at the University of Berlin [11]. He introduced shift plus rotation transform.…”

mentioning

confidence: 99%

“…These are a) standard formulae (11) and (13) Can the extended transform be extended once again? We may add spherical functions to the right side of (9), like in many astrometric texts on catalogue comparison, e. g. [12].…”

mentioning

confidence: 99%

On the extension of Helmert transform

Choliy

2014

Adv.Astron.Spa.Physics

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The article deals with the method of comparison of the coordinate systems used by two quite dierent scientic disciplines: stellar astronomy and the geodesy. Geodesic Helmert transform is analysed along with a series of stellar astronomy kinematic models: Kovalsky-Airy, Lindbladt-Oort and Ogorodnikov-Milne. An analogy was built allowing us to propose an extension to the Helmert transform. In the second part of the article, three dierent approaches to the solution of the correlation problem are compared, and the results of the numerical experiment are presented.

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Computing Helmert transformations

Cited by 92 publications

References 3 publications

Faállomány-szerkezeti kutatások a Roth emlékerdőben

Faállomány-szerkezeti kutatások a Roth emlékerdőben

Multi-sensors integrated system for landslide monitoring: critical issues in system setup and data management

On the extension of Helmert transform

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