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Study of NSSDA Variability by Means of Automatic Positional Accuracy Assessment Methods

Department of Cartographic Engineering,University of Jaén, 23071 Jaén, Spain
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ISPRS Int. J. Geo-Inf. 2019, 8(12), 552; https://doi.org/10.3390/ijgi8120552
Received: 18 September 2019 / Revised: 27 November 2019 / Accepted: 2 December 2019 / Published: 2 December 2019
Point-based standard methodologies (PBSM) suggest using ‘at least 20’ check points in order to assess the positional accuracy of a certain spatial dataset. However, the reason for decreasing the number of checkpoints to 20 is not elaborated upon in the original documents provided by the mapping agencies which develop these methodologies. By means of theoretical analysis and experimental tests, several authors and studies have demonstrated that this limited number of points is clearly insufficient. Using the point-based methodology for the automatic positional accuracy assessment of spatial data developed in our previous study [1] and specifically, a subset of check points obtained from the application of this methodology to two urban spatial datasets, the variability of National Standard for Spatial Data Accuracy (NSSDA) estimations has been analyzed according to sample size. The results show that the variability of NSSDA estimations decreases when the number of check points increases, and also that these estimations have a tendency to underestimate accuracy. Finally, the graphical representation of the results can be employed in order to give some guidance on the recommended sample size when PBSMs are used.
Keywords: spatial data accuracy; automatic assessment; standards; NSSDA estimations spatial data accuracy; automatic assessment; standards; NSSDA estimations
MDPI and ACS Style

Ruiz-Lendínez, J.J.; Ariza-López, F.J.; Ureña-Cámara, M.A. Study of NSSDA Variability by Means of Automatic Positional Accuracy Assessment Methods. ISPRS Int. J. Geo-Inf. 2019, 8, 552.

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