The analysis of data quality on topographic maps ; analiza kakovosti podatkov na topografskih kartah

Podatki na topografski karti se geometri no in tematsko deloma razlikujejo od dejanskega stanja v naravi. Za dolo itev geometri ne natan nosti se uporablja primerjava podatkov na karti s pravimi in pogojno pravimi vrednostmi na natan nej em viru. Pri tem se obi ajno uporabljajo numeri ni podatki polo ajnih in vi inskih mre ali podatki kart ve jega merila, na katerih je mogo e primerjalno zanemariti napake posameznih objektov glede na merilo. Tak na metoda omogo a neposredno oceno natan nosti tiskanih kart in reprodukcijskih originalov v primerjavi z eksperimentalno metodo, pri kateri se obravnavajo in dolo ajo napake posameznih faz v procesu izdelave topografskih kart. Geometri na in v veliki meri tematska natan nost topografskih kart nista vedno zadovoljivi, kar je odvisno od na ina izmere in tipa vsebine, na primer od geodetskih to k, ki so natan nej e, do podatkov vegetacije, katere polo ajna natan nost je najslab a ; The data quality of topographic maps involves a degree of deviations of geometric and thematic content from their actual position and status in nature, respectively. For determining the geometric accuracy, comparative way of testing is usually applied, namely the comparison of measured values of topographic maps with "true" or "conditionally true" values (numeric data of positional and elevation network or data of a map in a larger scale, where the content errors of individual elements could be neglected in comparison due to differences in the scale of mapping). This method gives a direct accuracy assessment of printed maps and reproduction originals, as opposed to the experimental method which considers and determines errors in certain phases in the process of making topographic maps. Geometric, and to a large extent thematic accuracy of topographic maps are not always reliable enough and depend on the way of surveying and the type of contents, i.e. from geodetic control points, which are more accurate, to vegetation whose positional accuracy is the worst.