Precise point positioning (PPP) involves observations from a single global navigation satellite system (GNSS) receiver and benefits 4 of satellite orbit and clock products obtained from the global infrastructure of permanent stations. PPP avoids the expense and logistic diffi-5 culties of deploying a network of GNSS receivers around survey areas in isolated places, such as the arctic or less populated areas. Potential 6 accuracies are at the centimeter level for static applications and at the subdecimeter level for kinematic applications. Static and kinematic PPP 7 based on the processing of global positioning system (GPS) observations is limited by the number of visible satellites, which is often insufficient 8 for urban or mountain applications, or it can be partially obstructed or present multipath effects. Even if a number of GPS satellites are available, 9 the accuracy and reliability can still be affected by poor satellite geometry. One possible way of increasing satellite signal availability and po-10 sitioning reliability is to integrate GPS and global navigation satellite system (GLONASS) observations. This case study deals with the pos-
The microgravimetric surveying technique is applicable to the detection of shallow subsurface structures if a lateral density contrast is presented, and thus, it is a valid technique for archaeological prospection. In this paper, this technique has been revealed to be an efficient tool for archaeological studies, such as those performed inside Don Church (18th century), located in the urban area of Alfafar town, Valencia (Spain), where a buried crypt, suggested by different boreholes drilled during the second restoration process in 1993, is expected. Details of the site"s characteristics, topographic survey procedures, microgravimetric field operations, data collection and gravity reduction operations (where the inner building effect of walls, pillars and the altar is confirmed as one of the most important) are also presented. Finally, the results confirm the buried crypt.
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