However, accurate survey of IAS over larger areas (e.g., hectares) by using traditional methods (based on transects or quadrats) is extremely limited in terms of time, energy, and cost. Therefore, it is important to know the current distribution and population dynamics of IAS, which is only possible with proper monitoring methods. In protected areas, the management and control of IAS is one of the most important tasks of nature conservation. With the methods presented here, the data of large populations of invasive species can be processed in a simple, fast, and cost-effective manner, which can ensure the precise planning of treatments for nature conservation practitioners. The used methods were not suitable for the determination of milkweed shoot and the blanket flower inflorescence number, due to significant overestimation. In spite of this, it gave a low producer’s accuracy of 43.74% and user’s accuracy of 51.4%. For the cover area of blanket flower, the IF index proved to be the most suitable index. The producers’ accuracy was 76.38% (TGI) and 67.02% (SSI), while the user’s accuracy was 75.42% (TGI) and 75.12% (SSI), respectively. According to the results, the cover area of common milkweed was best identified with the TGI and SSI indices. To examine this, we determined the shoot area and number of common milkweed ( Asclepias syriaca) and the inflorescence area and number of blanket flowers ( Gaillardia pulchella) as two typical invasive species in open sandy grasslands. The goal was to examine whether six RGB indices are suitable for identifying invasive plant species in the QGIS environment on UAV images. Vegetation indices for multispectral camera images are often used for this, but RGB colour-based vegetation indices can provide a simpler and less expensive solution. Unmanned aerial vehicle (UAV) monitoring is one of the best tools for gathering this information from large areas. In order to effectively manage invasive species, it is important to know their current distribution and the dynamics of their spread. Today, invasive alien species cause serious trouble for biodiversity and ecosystem services, which are essential for human survival.
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