There are four resolutions in digital remote sensing systems to consider. We will define each and explain where trade-offs exist when you require certain specifications.
In topic of orbits and sensors we will learn about how satellites collect data and what kinds of satellites exist. We will start to link the nature of satellites to the resolution of the data they acquire. Again, try to keep in mind which satellites would be useful for forest resource management questions based on what you know about resolutions.
Topic Readings
Required Readings
There are no required readings for this topic.
Optional Readings
Shellito, B.A. (2014). Chapter 10: How Remote Sensing Works. In E. Bruno (Ed.), Introduction to Geo-Spatial Technologies (2nd ed., pp. 355-377). New York, NY: W.H. Freeman and Company.
Resolution plays an important role in remote sensing because in a sense it establishes the boundaries of the data. For example, if you want to be able to identify individual trees, then you know a fine spatial resolution is required. Boundaries of data can also be established through the trade-offs that exist. For example, if you want data with a very fine spatial resolution, you have to make sure you have a computer system has enough capacity to handle a very large amount data.
One of the first things remote sensing analysts have to consider is what data they need to answer their question. Researchers have to pick a satellite to acquire data from, so knowing the specifications of different satellites and comparing their pros and cons is an important skill.
Topic Self-review (For self learning)
Please use the reflection questions below as study guide to conduct self-review for the topic.
Self Review 3.1.1 – Resolutions in Remote Sensing
Define spatial resolution and explain some trade-offs to consider
Define radiometric resolution and explain how it is determined
Define spectral resolution and explain each category
Define temporal resolution and explain what influences it
Compare and contrast different resolutions in terms of their capabilities and applications
Self Review 3.1.2 – Orbits and Sensors
Explain each type of orbit and what their applications are
How is data acquired from satellites?
Compare and contrast 3 of the satellites we discussed with respect to: resolution, orbit type and applications
What are some of the other platforms becoming available (i.e. not a traditional satellite)?