POSSIBILITIES OF APPLYING 3D DATA OF VARIOUS ACCURACY IN LAND MANAGEMENT

Abstract

The article analyzes the differences in land surface altitudes determined using different data sources: maps.lt, geoportal.lt and GNSS measurements. The aim of the study is to assess the accuracy of data from these sources and their applicability for land management purposes. In order to be objective, the study was conducted in different land uses – arable land, forest land, green spaces and natural meadows and pastures.

The results of the study showed that the largest altitude discrepancies were recorded in forested areas, where the difference between maps.lt and geoportal.lt reached as much as 5.90 m, and with GNSS measurements – 0.70 m. In open areas, such as arable land, the altitude differences were significantly smaller – usually not exceeding 0.20 m. GNSS data turned out to be the most accurate, and the largest discrepancies were determined between the maps.lt and geoportal.lt height models.

The study emphasizes the need to carefully select 3D data sources, taking into account the specifics of the territory. The results can be useful in planning infrastructure projects and environmental measures, where the accuracy of elevation data is a critical factor.