Remote sensing is an aerial photography technique that can provide precise images of the earth’s surface. It is increasingly being used in GIS, and improves the accuracy of GIS maps.
The term remote sensing refers to the acquisition of information about a place or subject without visiting it. Data is collected using satellites, aerial sensors, and ground-based sensors. Since remote sensing data is easily accessible and of high quality, it has become an important source of geographic information in many fields, including defense, geography, cartography, and others.
To learn more about remote sensing and GIS, continue reading.
Why Remote Sensing is an Important Tool for GIS?
There are many advantages to remote sensing that make it extremely useful for GIS. This method can be used to measure the Earth’s surface over large areas at a low cost. In remote sensing, data is obtained from a variety of sources, such as satellites, aircraft, and unmanned aircraft. Besides, remote sensing applications are not dependent on the weather, the time of day, or even the weather cycle.
By using remote sensing technology, it is possible to obtain highly accurate measurements and capture images at a relatively low cost. Among others, remote sensing has been widely used for land cover mapping, resource management, pollution mitigation, and disaster relief. In GIS systems, remote sensing is also used to create maps, to make spatial projections, and to conduct surveys.
The information gathered using remote sensing can be used for multiple purposes, including analyzing site suitability, mapping vegetation distribution, and monitoring changes in the environment. A remote sensing system can be used to detect pollution in water or changes to the land. It can also be used to monitor environmental changes such as deforestation or rainfall patterns.
GIS and Remote Sensing Tools You Should Know About
Depending on the signal used to inspect objects, there are two types of remote sensing: active and passive. Remote sensing using active technologies employs its own light and radiation, while passive systems use reflected radiation to function.
Active remote sensing instruments
Due to their lack of dependence on sunlight and relative insensitivity to atmospheric scattering, active-type remote sensing systems function normally regardless of the time of day.
- Lidar – The Lidar uses light to determine distance. Remote sensing in Lidar comprises transmitting light and detecting the amount received. The destination and distance can be understood by multiplying time by the speed of light.
- Laser altimeter – It uses Lidar to measure elevations.
- Sounder – These instruments checks the weather conditions vertically by sending out impulses if it belongs to the active category. It helps you create weather forecasts for humidity, precipitation, temperature, and the absence/existence of clouds.
Passive remote sensing instruments
Unlike active sensors, passive sensors rely on the reflection of natural energy (sunlight) by the target. Therefore, it can only be used in sunny conditions. Passive remote sensing uses multispectral sensors that use a multiple band combination to measure the quantity.
- Spectrometer – It helps to differentiate and further analyze the spectral bands.
- Radiometer – This instrument is used to measure the radiation power of an object in defined band ranges.
- Hyperspectral radiometer – It can be used in conjunction with the accurate passive sensors. Due to its extremely high resolution, it can distinguish hundreds of very narrow spectral bands in the visible, near-infrared regions.
- Accelerometer – It detects all changes in terms of speed per unit of time.
- Imaging radiometer – It can scan an object or surface and reproduce the image.
With a wide array of applications, remote sensing has now become an essential tool in geospatial analysis. It is often used in disaster response, agriculture, forestry, urban planning, and civil engineering. Climate research and environmental studies also rely on remote sensing data.
SBL provides GIS and remote sensing services to most countries in the world. Our team consists of engineers, geospatial consultants, and remote sensing experts who have extensive experience in this field. By offering these services at a reasonable rate, we have built up a great reputation in the industry.
For more information, please contact our GIS division.