IGeoE: Positional quality control in the 1/25000 cartography

António Jaime Gago Afonso 1, Rui Alberto Ferreira Coelho Dias 2 and Rui Francisco da Silva Teodoro 3
1 Data Acquisition Department, Army Geographic Institute, Lisbon, Portugal, 
Av. Dr. Alfredo Bensaúde 1849-014 Lisboa, 
afonso@igeoe.pt
2 Data Acquisition Department, Army Geographic Institute, Lisbon, Portugal, 
Av. Dr. Alfredo Bensaúde 1849-014 Lisboa, 
ruidias@igeoe.pt
3 Data Acquisition Department, Army Geographic Institute, Lisbon, Portugal, 
Av. Dr. Alfredo Bensaúde 1849-014 Lisboa, 
rteodoro@igeoe.pt

Abstract
Being aware of the importance of the knowledge of the accuracy of the geographic information contained in its digital cartographic products, the Army Geographic Institute (IGeoE) has been investing human and material resources  with the objective of developing work methodologies that allow to evaluate the positional accuracy of that information. The IGeoE has been using as reference the NATO document STANDARDIZATION AGREEMENT (STANAG) 2215 of October 15,  2001, entitled Evaluation of Land Maps, Aeronautical Charts Digital and Topographic  Dates, which describes a methodology for acquisition of planimetric and altimetry coordinates of a sample constituted by 167 diagnosis points, for an area produced with a certain scale. The IGeoE, experienced of the difficulty of finding good reference points to use in the  quality control, it was developed a work methodology that allows to do those studies. This methodology allows, in a selective way, to search the areas of land in order to embrace a significant number of details contained in its cartography. Having in mind huge amount of details contained in a sheet of the 1/25000 military map, it is not possible to check all those details. In conclusion, this article describes, in a briefly way, the main phases of the work  that is done in what concerns of the Quality Control of the IGeoE cartography.

Keywords: accuracy, methodology, quality control

In: Caetano, M. and Painho, M. (eds). Proceedings of the 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences, 5 – 7 July 2006, Lisboa, Instituto Geográfico Português

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