The services ensure accurate and cost-effective data collection which is important input for planning and designing of mapping projects. Company ’s expertise in remote sensing branches out to meet classification, image correction, image enhancement, image processing, and change detection services.
Remote sensing is the art and science of making measurements of the earth using sensors on airplanes or satellites. These sensors collect data in the form of images and provide specialized capabilities for manipulating, analyzing, and visualizing those images. Remote sensed imagery is integrated within a GIS.
Remote Sensing Mediums:
- Black & White or “Panchromatic”
- Sensitive to visible light
- True Color
- Similar to color film
- Sensitive to infrared frequencies that can’t be seen by humans
- Developed by military for identifying tanks painted with camouflage
- Good for evaluating the conditions of vegetation
- Good for evaluating moisture in the soil
- False-color Adjusted
- When frequencies of received data are shifted to allow or enhanced human viewing
- When more than a single ‘band’ of energy is captured
- color is multi-spectral (3 bands)
- Some satellites can have 7 or even more ‘bands’ of sensitivity
Applications of using Remote Sensing:
- Laser & Radar altimeters on satellites have provided a wide range of data. By measuring the bulges of water, they map features on the seafloor to a resolution of a mile or so. By measuring the height and wavelength of ocean waves, the altimeters measure wind speeds and direction, and surface ocean currents and directions.
- Conventional radar is mostly associated with aerial traffic control, early warning, and certain large scale meteorological data.
- Doppler radar is used by local law enforcements’ monitoring of speed limits and in enhanced meteorological collection such as wind speed and direction within weather systems in addition to precipitation location and intensity.
- Ultrasound (acoustic) and radar tide gauges measure sea level, tides and wave direction in coastal and offshore tide gauges.
- Light Detection & Ranging (LIDAR) is well known in examples of weapon ranging, laser illuminated homing of projectiles. LIDAR is used to detect and measure the concentration of various chemicals in the atmosphere, while airborne LIDAR can be used to measure heights of objects and features on the ground more accurately than with radar technology. Vegetation remote sensing is a principal application of LIDAR.
- Radiometers and photometersare the most common instrument in use, collecting reflected and emitted radiation in a wide range of frequencies. The most common are visible and infrared sensors, followed by microwave, gamma ray and rarely, ultraviolet.
- Stereographic pairs of aerial photographs have often been used to make topographic maps by imagery and terrain analysts in traffic-ability and highway departments for potential routes, in addition to modeling terrestrial habitat features.