Use of satellite in weather forecast

1. Use of satellite imageries in
weather forecasting

2. What is weather forecasting?
 Weather forecasting is the application of science and
technology to predict the condition of the atmosphere for
a given place and given time.
 Weather forecasting are important because they are
used to protect life and property.
 Farmers need information to help them for the planning
and harvesting of their crops.

3. What is satellite imageries ?
 Satellite images are one of the most powerful tool use by
meteorologists.
 They are essentially the eyes in the sky.
 These images reassure forecasters to the behavior of the
atmosphere as they give a clear, and accurate
representation of how events are unfolding.

4. Satellite imageries
The resolution of the sensor defines the pixel size and the detail and
Accuracy of Satellite imageries.
1. Spatial resolution :It is the area on ground represented by each
pixel
2. Temporal resolution : It tells how often a satellite obtaining
imagery of particular area.
3. Spectral resolution : It is the specific wavelength interval in
electromagnetic spectrum.
4. Radiometric resolution : It tells how the sensor changes brightness
of object . It’s range is expressed as power of 2^n.
5. View angle resolution: Number of angles at which ground objects
are recorded.

5. SATELLITE IMAGERY

6. Procedure of Weather Forecasting
1. recording of weather data (temperature, pressure,
wind speed and direction, cloud forms, humidity
and precipitation, visibility, storms etc.)
2. collection of weather data from weather
recording (observations centers) stations scattered
world over including both land and ocean surfaces
3.transmission of weather data collected form major
weather stations to sub centers .

7. 4. Compilation of weather data.
5. Plotting of weather data on maps and daily
weather records, synoptic charts etc.
6.Analysis of weather charts and maps with the help
of electronic computers etc.
7. Final forecasting of weather and numerical
modeling .

8. Geostationary Satellite: cannot see polar areas;
36,000 km above equator at fixed location;Same
speed as earth’s rotation.

9. Polar-orbiting Satellite: 850 km above surface,nearly
follow the meridion, cover the whole earth.

10. 3-D infrared imagery

13. VIIRS data display for (top) night
time and (bottom) day time low
clouds and fog over the Bering
Sea, using NtMicro and DtMicro
RGB composite images,
respectively.

14. SATELLITE IMAGE OPERATORS
1.Arithmetic operators: Addition, subtraction,
multiplication, division, exponent, compliment and
negation.
2.Spatial transformation: Blurring, sharpening and
filtering.
3.Edge,line and spot detection performs gradient
transformation.
4.Colour conversion operator: Transform the image from
one color model to another color model.
5.Geometric transformation: Rotation , scale and wrap.

15. Visible Satellite Image forecasting

16. Conclusion
 With the advancement of technology weather
forecasting by using satellite images has developed to its
level best, but there is still more scope for development
because nature is so unpredictable.
 Natural calamity and weather disturbance causing
devastating distructions, weather forecasting by using
satellite images is very important.