Long Distance Wired Data Connection
100 meters is the standard limit for Ethernet connections, though many people have success beyond that (dependent on timing, shielding, conductor quality, RF environment, transceiver signal strength, and a variety of other factors). If you're planning on several video streams or are closer to 300m than 100m, fiber makes the most sense (if you run OM3 or OM4 you have the option of starting with inexpensive 1000BASE-SX multi-mode and upgrading to 10GBASE-SR if/when you require the additional bandwidth; OM3 will give you 300m with 10GBASE-SR). You can connect the fiber to a switch on the remote side and then run copper a short distance to the cameras and sensors (this also gives you the option of using PoE).

Make sure you use burial-grade cable in either case.