I need to know the exact time, so that I can collect my samples in that time.
Most likely your question is not when it passes over but when it will record an image. That is not the same. Meteorological satellites record images at ergular (specified) times, but many other satellites will only record data during parts of their orbit. Which part of the orbit/which time they will record images is planned by mission control. If you want dates of overpass, easiest is to contact the provider of the images you want to use. If you want to make sure an image is recorded, you may have to resort to submit a request for the image to be recorded at that time (usually at extra cost). Some sensors also have pointing capability, meaning that they will also be able to "see" your area from neighbouring orbits, if tasked to do so.
Most likely your question is not when it passes over but when it will record an image. That is not the same. Meteorological satellites record images at ergular (specified) times, but many other satellites will only record data during parts of their orbit. Which part of the orbit/which time they will record images is planned by mission control. If you want dates of overpass, easiest is to contact the provider of the images you want to use. If you want to make sure an image is recorded, you may have to resort to submit a request for the image to be recorded at that time (usually at extra cost). Some sensors also have pointing capability, meaning that they will also be able to "see" your area from neighbouring orbits, if tasked to do so.
Since you may encounter difficulties in achieving an exact match, you may also want to check the so-called mismatch errors (mis-time, mis-distance, mismatch of local point measurement versus extended field-of-view of the satellite). Their impact strongly depend on the parameter you are observing.
See e.g. Wendt, Verena und Wüst, Sabine und Mlynczak, Martin G. und Russell III, James M. und Yee, Jeng-Hwa und Bittner, Michael (2013) Impact of atmospheric variability on validation of satellite-based temperature measurements. JASTP, doi: 10.1016/j.jastp.2013.05.022.
If you know which satellite sensor data you are trying to acquire for processing, just request the providers for the specific date and time to know the availability.
Or you may acquire the path/row information of the satellite for predefined paths and select your choice.
Even services are available with providers sor pointing capability satellites to pre program your request for specific date time and area of pass, but for advanced or highly paid users / projects.
It needs to know the orbit parameters of the satellite. Maybe the STK software works well for your job! Good Luck!
Start with the information on the specified satellite web site. In addition to the sensors, data collection and available product level, most of them provide valuable information including local pass time.
For polar-orbit satellites, there is an overpass finder web page, which tells you exactly the time there satellite pass any location in the world. The Geo-stationary satellites are always there as long as your location within their specific coverage. But their data published on-line are usually every 30 minutes, for example, GEOS data.
If you want to collect GNNS data, you can use "GNSS planning" to define the time when a satellite passes over a specific location :
http://www.spectraprecision.com/gnss-planning-17876.kjsp
or http://asp.ashtech.com/GNSSPlanningMobile/fr.html for example...
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