## 4 Discussion  
Land division is an obvious obstacle in defining the size and shape of prehistoric settlements. This is especially visible in the cases of sites such as Ivanovac-Korodvar and Gorjani-Kremenjaca. As documented throughout this research, visibility varies significantly depending on the period of the year, moisture, and crop type. Due to these factors, constant monitoring is crucial in creating settlement layouts through a mosaic of images. Therefore, the availability of satellite images on an almost daily basis is an invaluable tool that will significantly improve non-destructive archeological research in the future. We also observed different visibility at different sites, for example, on 8 June 2020, when visibility was optimal at the sites Koritna, Klasa and Gat, almost nothing could be observed at the sites of Gorjani-Kremenjaca and Ivanovac-Korodvar. In previous times, with limited access to aerial and satellite images, many of the sites could have been omitted simply on that criteria. Spectral characteristics of Sentinel-2 for crop mark distinction are already recognized as better compared to other satellite sensors [11; 12; 13]. Furthermore, it is recognized as suitable for larger features, even using only most common bands, B2, B3 and B4 [14]. In this case, it was proven effective for the recognition  
Figure 23: Gorjani-Kremenjaca, oblique image from drone (photo: [PERSON], 29 May 2015). Figure 22: Gorjani-Kremenjaca, drone image from 28 May 2018. Shape of the part of the inner enclosure is marked by arrows. of large soil and crop marks, even without the pre-processing of images. We are confident that more detailed analysis, which we are working on, will provide even better results. What is now confirmed beyond any doubt is that Neolithic settlements were of the size of contemporary small villages. This means that their size was far larger than previously thought. A system of ditches points us in the direction of investigating prehistoric habitational and technological practices as well as questions of communal work and other types of choices dictated by living in a large enclosed community. The size and complexity of such sites prevent us from investigating it using standard archeological methods, therefore, using remote sensing methods and developing observation practices using available satellite images will become a mandatory part of Neolithic settlement research. These sites showed a wide range of settlement (layouts) patterns, which might indicate different chronological phases or different social relations/needs. All mentioned sites, especially Gorjani-Kremenjaca, were among the sites with the most complex internal settlement structure in the Carpathian Basin and Central Europe. These sites are also large Neolithic settlements such as Bordos in Serbia [24], Polgar-Cosozhalom [25] and Ocsod-Kovashalom [26] in Hungary, and by complexity and geographical proximity are more comparable with Belvardsyula-Nadas [27], Geredlak-Hosszuhat [27], Szemely-Hegyes [27]), Zengovarkony-Igaz-dalo [27], and in Hungary Baraya [28] (and Bylany in the Czech Republic [29], which all present a similar organizational pattern. The combination of the analysis of aerial and satellite images provides the most comprehensive results and enables capturing sites in their entirety. Using traditional methodologies, archeologists could only detect small portions of their sites, and as a result, much smaller areas have been protected as cultural heritage compared to their actual size. Historical records are also an integral part of developing site caption methodology. In the end, excavations are required only to confirm the precision of observed structures and chronology. Satellite imagery has become the best cost effective method for systematical monitoring of archeological sites with various sequences of soil marks and cropmarks throughout the seasons. Higher frequency of new images on Sentinel constellation satellites provides a powerful tool for remote sensing analysis.