Question

If LANDSAT data fon an area is received today, then the data for an adjacent area to its west will be available
1. in the next orbit of the satellite on the same day
2. next day at the same local time
3. after certain number of days at the same local time
4. after a variable controllable time

Answer 1

Correct Answer - Option 3 : after certain number of days at the same local time

The correct answer is after certain number of days at the same local time.

• The Landsat 7 and Landsat 8 satellites orbit the Earth at an altitude of 705 kilometers (438 miles) in a 185-kilometer (115-mile) swath, moving from north to south over the sunlit side of the Earth in a sun-synchronous orbit, following the World Reference System (WRS-2).
• Each satellite makes a complete orbit every 99 minutes, completes about 14 full orbits each day, and crosses every point on Earth once every 16 days.
• The satellite orbits are offset to allow 8-day repeat coverage of any Landsat scene area on the globe.
• The Landsat 7 and Landsat 8 satellites each acquire data by their respective Long Term Acquisition Plan (LTAP) using parameters such as seasonality, land definition, historical cloud cover, gain settings, and sun angle.