I am trying to measure the altitude of a Hoist elevator ( on 200m high building), by installing sensors on top of it and publishing the altitude to the cloud using Particle Photon. Could someone please suggest a reliable way of measuring the hoist/elevator altitude. Below are the options that I am aware of:
1. Using Barometric pressure sensors (Installing a pressure sensor on the Ground level and one on the hoist); Calculate the altitude based on difference in pressure. As the building is 200m high, I am concerned about accuracy due to high wind speeds, temperature variation etc.
2. Laser Range finder: I am not aware of any off the shelf products, that I can connect with Spark electron, to measure that altitude.
3. RTK GPS: I learnt that the accuracy is in cm’s on flat surface, but unsure about accuracy in measuring height. Again, as there are building around, getting satellite signals would not be reliable.
Below is the image showing the hoist going up on a construction site.