GEOG 2195 Lecture Notes - Lecture 4: Remote Sensing Systems, Synthetic Aperture Radar, Hyperspectral Imaging
October 16th – Intro to Remote Sensing
Remote Sensing = the science of acquiring information about the earths surface without actually being in contact
with it.
- Sensing and recording reflected or emitted energy and processing, analyzing and applying that
information.
Basics of Remote Sensing
Global RS Process:
- Project design
- Data collection
- Interpretation and analysis for information extraction
- Maps and graph outputs
We use RS to put into a geographic information system to create cartography – geo info science
Data is collected from distance in the form of images (rasters, matrices of data) which are a representation of the
amount of electromagnetic radiation (EMR) reflected or emitted by objects on the surface of the earth. This
provides from systemic collection of geographic information.
Components of Remote Sensing:
A. Energy Source or Illumination
- Providing the electromagnetic energy to the target of interest
B. Radiation and the Atmosphere
- Energy interacts with the atmosphere as it travels from source to target.
- Can happen twice when energy travels from target to sensor.
C. Interaction with the target
- Interacts depending on the target and the radiation
D. Recording of energy by the sensor
- Once scattered or emitted from target sensor collects and record the electromagnetic radiation
E. Transmission, reception and processing
- Transmitted from sensor in electronic form to receiver and processing station where the data is processed
into an image
F. Interpretation and analysis
- Image is interpreted visually, digitally, electronically, etc.. to extract the information about the target
which was illuminated
G. Application
- Applying the information making it easier to understand and show new information assisting in solving a
particular problem
Electromagnetic Radiation
The energy used to illuminate target is in the form of electromagnetic radiation which all has fundamental
properties and behaves in predictable ways according to the basics of wave theory.
EMR: Electrical Field (E), Magnetic Field (M) and Speed of Light (C)
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Remote sensing = the science of acquiring information about the earths surface without actually being in contact with it. Sensing and recording reflected or emitted energy and processing, analyzing and applying that information. We use rs to put into a geographic information system to create cartography geo info science. Data is collected from distance in the form of images (rasters, matrices of data) which are a representation of the amount of electromagnetic radiation (emr) reflected or emitted by objects on the surface of the earth. This provides from systemic collection of geographic information. Providing the electromagnetic energy to the target of interest. Energy interacts with the atmosphere as it travels from source to target. Can happen twice when energy travels from target to sensor. Interacts depending on the target and the radiation: energy source or illumination, radiation and the atmosphere, recording of energy by the sensor.
