What is remote sensing technology

 

About remote sensing technology

Remote means something which is not exactly in contact or physical contact, Sensing means getting information, data something like temperature, pressure, photograph, etc. In other words, remote sensing is the process of acquiring information, detecting, analyzing, monitoring the physical characteristics of an area by recording it is reflected and emitted radiation energy without having any physical contact with the object under study. This is done by capturing the reflected radiation/energy by the students of top engineering colleges in Jaipur.

Types of Remote Sensing

1. Active sensor

The sensor embodies within itself the source of illumination like a satellite equipped with a RADAR sensor. Active sensors throw their own energy to scan the object. RADAR and LiDAR are examples of active remote sensing which measure the time delay between emission and return.

2. Passive sensor

The sensors gather radiation that is emitted or reflected by the object or surrounding areas. Sunlight reflection is the most common source of radiation measured by passive sensors. Examples of passive remote sensors are photography, infrared, and radiometers. Passive sensors are more used because it provides great quality satellite imagery. The passive sensor is superior within the field of technical observation of the planet, such as Multispectral and Hyperspectral technology.

Spectral Reflectance in Remote Sensing

Land-cover and land-use maps are required by the experts of best engineering colleges in Jaipur for many applications such as regions planning, landscape planning, and landscape ecology, agricultural management, and forestry.

Electromagnetic energy reaching the earth’s surface from the Sun is reflected, absorbed or transmitted. A basic assumption made in remote sensing is that specific study targets (different types of soils, water having different degrees of impurities, rocks of different lithologies, or vegetation of various species) have an individual and characteristic manner of interacting with incident radiation that is described by the spectral response of that study target.

The spectral reflectance can be affected by many factors such as soil nutrients, the growth stage of the vegetation, the color of the soil. In some instances, the interaction between incident radiation and earth’s surface object will be different from time to time, such as might be expected in the case of vegetation as it changes from the leafing stage, through maturity growth and, finally to senescence. The term ‘spectral signature’ is sometimes used to describe the spectral response curve for a study target.

Remote Sensing Major Applications Area

Satellites play a huge role in the development of many technologies like world mapping, GPS, City planning, etc. Remote Sensing is one of the many innovations made by the students of engineering colleges Jaipur that were possible, thanks to the satellites roaming around the earth.

Following are some major fields in what can remote sensing be used for Weather, Forestry, Agriculture, Surface changes, Biodiversity, and many more.

The primary application of remote sensing are as follows:

1. Analyzing the condition of rural roads

Rural road conditions are now possible to be analyzed using various GIS technique and Remote Sensing techniques with an inch to inch accuracy. It saves a lot of time and money from transporters.

2. Creating a base map for visual reference

Nowadays many modern mapping technologies are based on Remote Sensing including Google maps, open street maps, Bing maps, NASA’s Globe view, etc.

3. Computing snow pack

Snow melt ratio can be easily understood by the students of best BTech college in Jaipur using Remote Sensing technology, NASA uses LIDAR along with a spectrometer in order to measure the absorption of sunlight.

4. Collecting earth’s pictures from space

Many space organizations have a collection containing images of earth. Interesting patterns of earth’s geometry including atmosphere, oceans, land, etc can be seen in it. EO-1, Terra, and Landsat are used to collect this data.

5. Controlling forest fires

Information acquired by satellites using Remote Sensing enables firefighters to be dispatched on time and over correct locations so the damage from such fires can be decreased to minimal.

6. Detecting land use and land cover

Remote Sensing technologies are used to determine various physical properties of land and also what it is being used for (land use).

7. Estimating forest supplies

MODIS, AVHRR, and SPOT are regularly used to measure the increment/decrement in global forests since forests are the source of valuable materials such as paper, packaging, construction materials, etc.

8. Locating construction and building alteration

Tax revenue agencies use satellite data in several countries including Greece, Athens, etc. They locate signs of wealth using this technology. Early in the year of 2013, there were 15000 swimming pools (unclaimed to steal taxes) in those countries.

9. Figuring out fraud insurance claims

Many insurance companies use Landsat’s red and infrared channels to figure out vegetation growth in particular land. This information can be used to verify seeded crops and fight against crop insurance fraud.

10. Observing climate changes

Satellites such as CERES, MODIS, AMSRE, TRMM, and MOPITT has made it possible by the students of private engineering colleges in Jaipur to observe climate changes from up above the skies. It is also possible to compare past climate situation with the current one.

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