Lecture 3
ELECTROMAGNETIC RADIATION 
The energy from the natural source, sun is in the form of electromagnetic radiation (EMR), produced by nuclear reactions within the sun. The EMR consists of an electric field and magnetic field which are perpendiculars to each other moving in a-harmonic; wave pattern at: a constant speed of light (3 x 103 m/s) and perpendicular to the direction of motion. 

Electromagnetic Wave
The electromagnetic wave displays three properties (Fig. 2.4) (i) Wavelength (ii) Frequency and (iii) Amplitude. 
1. Wavelength. It is the length of a single wave that is from one wave peak to next. It is measured in the unit of length such as Angstrom (A 10-10 m) Nanometre (nm, 10-9 m), Micrometer (µm 10-6 m) or Centimetres (cm). It is represented by Greek letter, Lambda (λ). 
2. Frequency. It is measured as number of wave peaks passing a fixed point in a given time. It is measured in Hertz which is equal to one cycle / second. It is denoted by v. 
3. Amplitude. It is the height of each wave peak. 

Comments

Post a Comment

Popular posts from this blog

Image
Lecture 12 Data Products from Indian Satellite Overview ISRO has a vibrant Indian Remote Sensing program since 1988 with a gamut of Indian Remote Sensing Missions (IRS) observing Earth with Optical, microwave and hyper-spectral instruments flown on-board to provide necessary data in various spatial, spectral and temporal resolutions to cater to different user requirements in the country and for global usage.NRSC is the nodal centre for hosting Satellite Data Products from more than 13 IRS satellites right from the first IRS optical mission namely IRS-1A and SAR imaging missions. Satellites are primarily tasked to cover India and surroundings in a programmatic manner or on-demand as required by user as per mission capability. NRSC also acquires and archives data of global regions for disasters, calibrations and specific studies. Near real time data products from IRS weather sensors is delivered for climate and weather models for a global coverage. Georeferenced, Orthokit, Orth
Read more
Image
Lecture 9 Components of GIS data output functions Geographic Information System Five Components. 1.      Hardware: 2.      Software: 3.      Data: 4.      People: 5.      Methods :   Figure: How GIS Components integrate with each other   Hardware: Hardware is Computer on which GIS software runs. Nowadays there are a different range of computer, it might be Desktop or server based. ArcGIS Server is server based computer where GIS software runs on network computer or cloud based. For computer to perform well all hardware component must have high capacity. Some of the hardware components are: Motherboard, Hard driver, processor, graphics card, printer and so on. These all component function together to run a GIS software smoothly. Main Hardware Components: 1.      Motherboard: It is board where major hardware parts are installed or It is a place where all components gets hooked up. 2.      Hard Drive: It is also called hard disk,  place to store data. 3
Read more
Image
Lecture 13 Soil information system for resource management – Tripura as a case study The basic requirement to develop a soil information system (SIS) is to have large datasets. Such datasets are not generally available for all the states and Union Territories of the country. Tripura is one of the states for which relevant and pertinent datasets on natural resources are made available by the National Bureau of Soil Survey & Land Use Planning (NBSS&LUP; ICAR), Nagpur, during the past decade. While reviewing and interpreting the published data on the 1 : 50,000 scale, it was realized that a SIS can be developed which can serve as an example as to how such a system could be built for other States and Union Territories. Tripura was surveyed earlier by the All India Soil and Land Use Survey (AISLUS) and later by NBSS&LUP to develop soil datasets. Since the modern day information system of any natural resource requires its physical location in terms of space, exact refer
Read more