Continuous protection of material cultural heritage is of exceptional importance for humanity. Immovable cultural assets are particularly at risk from various natural and anthropogenic factors that can cause permanent damage to the most valuable cultural monuments. Thanks to its development in recent decades, geospatial technologies enable noncontact documentation and modeling of cultural assets with great detail. Individuals and institutions responsible for the preservation of cultural heritage around the world have recognized the advantages of using modern digital methods of documentation over the classical methods they have replaced. 3D documentation technologies and accompanying software solutions have become an indispensable instrument for the long-term protection of cultural assets thanks to the possibility of collecting and processing a large amount of georeferenced data in a short period of time. The model obtained through the process of 3D modeling within the wider field of digital documentation, provides a completely new perspective of observing cultural assets, which can be used to obtain key knowledge needed to improve the conservation of that asset. Apart from the potential that 3D documentation has in the preservation of cultural heritage, it is used in various spheres of economy and education. The goals of the research are to determine the current state of representation of 3D documentation in the Republic of Croatia for material UNESCO World Heritage and for immovable cultural assets of the City of Zadar. The last goal is to give an example of the process of 3D documentation of cultural heritage through a comparison of the FARO Focus M70 terrestrial laser scanner and the ZEB Horizon GeoSLAM portable laser scanner, from data collection to the output point cloud, studying the venetian Land Gate in Zadar. Research into the current state of 3D documentation at the national level was done by searching the national Register of Cultural Properties and conducting an online survey among selected Conservation Departments, which showed that 3D documentation has not been done for more than 50% of cultural properties in Croatia from the UNESCO World Heritage List, and at the local level for more than 80% of Zadar's immovable cultural assets. In the second part of the research, dense point clouds were collected with two laser scanners and processed in FARO Scene and GeoSLAM Connect and then compared by statistical geometric parameters in the CloudCompare software, with the TLS point cloud serving as a reference. In the GeoSLAM point cloud of the Land Gate, a lower density of points was recorded for all studied elements, which will result in less detail when the model is created, but on the other hand the surface coverage is higher than in the TLS point cloud.