Remote sensing devices
Remote sensing is the acquisition of information about an object or phenomenon, without making physical contact with the object. In modern usage, the term generally refers to the use of aerial sensor technologies to detect and classify objects on Earth by means of propagated signals.

A video about the use of remote sensing and satellites to monitor the change in the Earth with regards to weather and climate.
Remote sensing devices
A definition of RADAR, SONAR and LIDAR.
Satellite imagery

What is satellite imagery?
Satellite imagery consists of photographs of the Earth or other planets made by means of artificial satellites.

What is it used for?
Satellite images have many applications in meteorology, agriculture, geology, forestry, landscape, biodiversity conservation, regional planning, education, intelligence and warfare. Satellite imagery is also used in seismology and oceanography in deducing changes to land formation, water depth and sea bed, by color caused by earthquakes, volcanoes, and tsunamis.

Issues with satellite imagery?
  • Because the total area of the land on Earth is so large and because resolution is relatively high, satellite databases are huge and image processing is time-consuming. Depending on the sensor used, weather conditions can affect image quality: for example, it is difficult to obtain images for areas of frequent cloud cover such as mountain-tops.
  • Commercial satellite companies do not place their imagery into the public domain and do not sell their imagery; instead, one must be licensed to use their imagery. Thus, the ability to legally make derivative products from commercial satellite imagery is minimized.
  • Privacy concerns have been brought up by some who wish not to have their property shown from above. Google Maps responds to such concerns in their FAQ with the following statement: "We understand your privacy concerns... The images that Google Maps displays are no different from what can be seen by anyone who flies over or drives by a specific geographic location."
Google Map
Let's take a look at how detailed the Google Map images for our school compound.
Global satellite lake monitoring led by Stirling University
How a university is using satellite imagery to monitor lake activity.
How do satellites work?
A webpage outlining how satellites work and the benefits to using them.
An online database of the data collected by satellite tags placed on animals.

Using satellite tags to monitor shark behaviour and movements for ecological purposes
What are satellite tags?
How satellite tags work and the development of these devices.