###### Abstract  
Over the past few decades, the global population and the built environment's vulnerability to natural hazards have risen dramatically. As a result, decisive actions, such as the SENDAI framework, have emerged to foster a global culture of successful disaster risk reduction policies, including actions to mitigate the social and economic impact of geohazazards. The effective study of natural disasters requires meticulous and precise monitoring of their triggering factors, with ground- and space-based techniques. The integration of GNSS and SAR observations through the establishment of permanent infrastructures, i.e., Continuously Operating Reference Stations (CORS) networks and arrays of Corner Reflectors (CRs), may form a seamless ground displacement monitoring system. The current research literature provides fragmented guidelines, regarding the co-location of SAR and GNSS permanent infrastructures. Furthermore, there exist no guidelines for the determination of the most suitable locations using a holistic approach, in terms of criteria and required data. The purpose of this paper is to present a semi-automatic multicriteria site suitability analysis and evaluation of candidate sites for the installation of a permanent CORS and two CRs; one for each pass, taking into account various parameters and criteria. The first results demonstrate that the collocation of SAR and GNSS permanent infrastructures, utilizing a holistic criteria-based approach, is successful and complies with all the literature's requirements. natural hazards; GPS; GNSS; InSAR; corner reflector; Multi-Criteria Decision Analysis; infrastructures 202212020217 February 202220217 February 202220217 February 202220217 February 20220220217 February 20220220217 February 20220220217 February 20220220217 February 20220220217 February 20220220217 February 20220220217 February 20220220217 February 202202217 February 202202217 February 2022202217 February 202220217 February 2022202217 February 2022202217 February 2022202217 promotes the precision of InSAR measurements and, hence, the reliability of deformation products [6; 7]. A new co-located GNSS/SAR infrastructure has been established in Cyprus, in the framework of the CyCLOPS project (Cyprus Continuously Operating Natural Hazards Monitoring and Prevention System) [8]. This project revolves around the formation of a strategic research infrastructure unit for geohazard monitoring, in Cyprus and the South-eastern Mediterranean Region. CyCLOPS is comprised of permanent collocated multi-sensor configurations, spread throughout the country for monitoring geohazards and solid earth processes. CyCLOPS is formed of the following two major parts: a novel multiparametric network (MPN) of sensors and an operation center (OC). The MPN consists of two segments (permanent and mobile). The permanent segment includes cutting-edge high-rate permanent GNSS receivers, which are installed at specifically selected sites on top of highly stable monuments, anchored in bedrock, according to the most stringent specifications (UNAVCO, IGS, and EPN guidelines). The collocated configuration of GNSS CORS and CRs is realized to be compliant with (a) all current GNSS constellations (GPS, GLONASS, Galileo, BeiDou-3) and (b) the current space-based SAR missions, such as Copernicus Sentinel-1 and TerraSAR-X. To date, six permanent sites have been established in government-controlled areas the Republic of Cyprus (depicted in Figure 1). In each site, two CRs (one for ascending and one for the descending pass) and one GNSS CORS are collocated, taking into account numerous and significant parameters, such as sky visibility, security, land topography, geology formation, land ownership, land cover, land access, and the backscatter coefficient (Sigma 0). One of the major challenges faced in the establishment of CyCLOPS was the determination of the most suitable locations for the installation of sensors.