Positional accuracy of geographical information and recent standards for its evaluation

Abstract

Positional accuracy is important quantity element of quality of geographical information in digital as well as in analoguos form. This paper points to importance and necessity of evaluation of positional accuracy in recent conditions, describes two modern standards for positional accuracy evaluation and shows the results of its implementation on raster topographic map at scale 1:50.000 made by Military Geographical Institute

Vertical accuracy of data on the topographic maps and their application in mining

“…The first one is related to assessments of mainly analogous maps (sometimes of digital maps too) and is not quite appropriate for using in conditions nowadays, while the second one is modern and usable nowadays; it is related to all digital spatial data (in a raster as well as in a vector form). To those standards one has to attach the very detailed and overall excellent elaborated standard STANAG 2215 -Evaluation of Land Maps, Aeronautical Charts and Digital Topographic Data and maps, (Radojčić, et al, 2011).…”

“…Furthermore, the standard (ISO, 2013) defines the absolute and relative (point-topoint) accuracy. Under the absolute accuracy standard it can assume the uncertainty in the 3D position of a point with respect to the WGS84 reference system, combined with EGM96 geoid model (Radojčić, et al, 2011). The absolute vertical accuracy is uncertain in terms of the height of a point with respect to the vertical datum.…”

“…In the vertical accuracy evaluation procedure, the first step is to calculate the height differences between the measured and reference height H i , the next step is to calculate the differences from the mean value of all differences H  and to calculate the linear standard deviation, (Radojčić, et al, 2011):…”

“…All topographic-cartographic products are divided in five classes (Table 1) by the value of the LMAS, (Radojčić, et al, 2011). Not determined…”

Central geospatial database analysis of the quality of road infrastructure data

“…By using methods of cartographic generalization we produce whole scale series of digital topographic maps. Topographic maps have a great advantage over some other collections of spatial data because of their visual effects, conciseness and the simplicity of use and that is why the demands for a developed system of elaboration, assessment and reporting procedures of their quality are completely justified Radojčić et al, 2011).…”