Both for soil and crop, proximal sensors can also be classified as portable handheld, or online (here measurement is taken while driving across a field by means of a tractor or a quad bike). In comparison with remote sensing, with proximal sensing the sensor is placed in direct contact or within a distance of 2 m from the target ( Viscarra Rossel et al., 2011 ). Sudduth, in Agricultural Internet of Things and Decision Support for Precision Smart Farming, 2020 2.3.1 A brief introduction to proximal sensing technology

Another important use is related to avoiding local restrictions that some countries impose on their own populations.A.M. Constant scandals related to the loss of privacy in the hands of big companies have led many users to try taking measures in order to avoid constant surveillance of their activities. The other is a modified, portable version of the Mozilla Firefox browser with several special features that help you take advantage of the anonymous browsing system provided by the tool. The first one is the control panel you use to connect to the Tor network which you will have to activate every time you want to browse anonymously.

The program changes the way in which information you send over the net travels, providing you with a routing system that hides your data from your internet provider, so that the pages you visit, your credentials, and your browsing history will remain anonymous at all times. The TOR project (The Onion Group) is an altruistic initiative promoted by several experts in Computer and Internet Security that provides users with a tool to protect their identities and maintain anonymity and browse the web.

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