A Computational Tool to Evaluate the Sample Size in Map Positional Accuracy

Nero, Marcelo Antonio; Cintra, Jorge Pimentel; Ferreira, Gilberlan de Freitas; Pereira, Túllio Áullus Jó; Faria, Thaísa Santos

doi:10.1590/s1982-21702017000300030

Cited by 6 publications

(11 citation statements)

References 9 publications

(10 reference statements)

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“…With the recent evolution of digital cartography and the geothecnology's resources, new products require other quality parameters, including a refinement of the assessment for positional accuracy assessment (Ariza-López et. al, 2007) and computational programs to perform it (Nero et. al, 2017).…”

Section: Absolute Versus Relative Positional Accuracymentioning

confidence: 99%

Comparison Between Absolute and Relative Positional Accuracy Assessment - A Case Study Applied to Digital Elevation Models

França

Penha²,

Carvalho

2019

Bol. Ciênc. Geod.

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This paper presents a comparative study between the absolute and relative methods for altimetric positional accuracy of Digital Elevation Models (DEM). For the theoretical basis of this research, the definitions of accuracy (exactness) and precision, as well the concepts related to absolute and relative positional accuracy were explored. In the case study, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and the Shuttle Radar Topography Mission (SRTM) DEM were used. In the analysis of the absolute accuracy, 6,568 ground control points from GNSS orbital survey were used, collected through relative-static method. In the relative accuracy, it was used as reference DEM with spatial resolution of 5 meters generated by stereophotogrammetrical process for the Mapping Project of Bahia (Brazil). It was concluded that, once the accuracy of the reference DEM is better than the other two evaluated DEM, the results of the classification for the PEC-PCD for the relative evaluation are equal to or better than the absolute evaluation results, with the advantage to being able to verify the pixel population of the evaluated models, which makes it possible to identify outliers, distortions and displacements, including delimiting regions, which is much less likely with a limited set of control points.

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Section: Absolute Versus Relative Positional Accuracymentioning

confidence: 99%

Comparison Between Absolute and Relative Positional Accuracy Assessment - A Case Study Applied to Digital Elevation Models

França

Penha²,

Carvalho

2019

Bol. Ciênc. Geod.

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“…The determination of object-points of building structures using the method presented in this work, also contributes to the study and quality control of topographic surveys performed with drones as well as control of the Digital Surface Model obtained with LiDAR data in urban environments. In these cases, a methodology for evaluating both planimetric and altimetric accuracy is discussed in Cintra & Nero (2015), Nero et al (2017), França & Silva (2018 and França et al (2019).…”

Section: Discussionmentioning

confidence: 99%

Optimized Determination of 3d Coordinates in the Survey of Inaccessible Points of Buildings - Example of Application Implemented in Free Software

et al. 2021

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The forward intersection method is already widely used in the geodetic survey of coordinates of inaccessible points, especially when only angle measurements are available, in this case, also called the triangulation method. However, the mathematical solution of the 3D forward intersection with the analytical definition of spatial lines, resolved by the Minimum Distances Method, is still not widespread in the academic and professional environment. This mathematical modeling determines the 3D coordinates of a point located in the middle of the minimum distance between two or more spatial lines, which spatially "intersect" towards the observation point. This solution is more accurate than others presented in the literature because it simultaneously solves the problem of 3D determination of a point by the method of least squares, in addition to providing an estimate of the coordinate precision, which are inherent to the adjustment. This work, therefore, has the objective of explaining the Minimum Distances Method for the spatial intersection of targeted measurements with a Total Station from two or more known observation points for the 3D determination of inaccessible points located in corners of buildings. For the analysis of the method, a Python tool was developed for QGIS that calculates the 3D coordinates and generates the adjustment processing report, being applied with real observations of the Geodetic survey of the SUDENE building, in Recife-PE. The methodology developed in this work proved to be suitable for measurements of large structures, achieving spherical precision better than ±1.0 cm, following the Brazilian standards for urban cadastre.

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“…As feições lineares de teste, deste estudo, são os perímetros de cada região circular que representa as áreas de pivô central identificados pela transformada de Hough, e as feições lineares de referência são os perímetros homólogos apresentados por ANA (2014).…”

Section: Classeunclassified

“…Essa avaliação da acurácia posicional de dados cartográficos tradicionalmente é realizada por meio de técnicas baseadas em feições pontuais (NERO et al, 2017;ARIZA-LÓPEZ, RODRÍGUEZ-AVI;ALBA-FERNÁNDEZ, 2018;CUNHA et al, 2019), como é preconizado pelo padrão brasileiro (Decreto n° 89.817/ET-CQDG). Na avaliação por meio de pontos é realizada a comparação estatística entre as coordenadas obtidas no produto avaliado e as coordenadas homólogas, obtidas em uma fonte mais precisa.…”

Section: Introductionunclassified

Avaliação da Acurácia Posicional e da Completude em Áreas de Pivôs Centrais Identificadas com a Transformada de Hough em uma Análise Multitemporal

Miranda

Ramos

Santos

et al. 2023

Rev. Bras. Cartogr.

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Tendo em vista a importância da agricultura irrigada para o país, principalmente para a produção de alimentos, conseguir delimitar e estimar as áreas plantadas passa a ser de suma importância para a gestão dos recursos hídricos. Porém, com a crescente popularização das ferramentas de aquisição e edição de informações espaciais, a avaliação da qualidade dos produtos cartográficos gerados é de fundamental importância para que se possa ter confiabilidade sobre as informações obtidas. Sendo assim, este trabalho se propõe a avaliar a qualidade posicional e a completude das feições que representam as áreas de cultivo com irrigação por pivô central, obtidas por um processo de extração semiautomática de feições baseado na Transformada de Hough, a partir de 9 imagens do sistema Landsat 8 adquiridas em dias diferentes. Para a avaliação da acurácia posicional das áreas identificadas, foram utilizados dois métodos: o método tradicional por pontos homólogos e o método de feição linear Buffer Duplo. Já para a avaliação da completude, foram utilizadas as métricas de comissão e omissão da ET-CQDG da INDE. Os resultados mostraram que, ao se realizar a soma das bandas 4 e 5 para os 9 dias, a omissão caiu de 34% para 2,61%. Já para a avaliação da acurácia posicional, utilizando o Decreto nº 89.817 e a ET-CQDG, o produto cartográfico apresentou classificação B para a escala 1:100.000 pelo método de comparação de pontos homólogos, enquanto o método do Buffer Duplo apontou uma classificação mais restritiva, enquadrando o produto na classe C para a mesma escala.

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A Computational Tool to Evaluate the Sample Size in Map Positional Accuracy

Cited by 6 publications

References 9 publications

Comparison Between Absolute and Relative Positional Accuracy Assessment - A Case Study Applied to Digital Elevation Models

Comparison Between Absolute and Relative Positional Accuracy Assessment - A Case Study Applied to Digital Elevation Models

Optimized Determination of 3d Coordinates in the Survey of Inaccessible Points of Buildings - Example of Application Implemented in Free Software

Avaliação da Acurácia Posicional e da Completude em Áreas de Pivôs Centrais Identificadas com a Transformada de Hough em uma Análise Multitemporal

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