Remote Sensing: Detecting Objects on Earth

In summary, the conversation discusses the use of remote sensing to detect and differentiate between objects on Earth. The speaker has questions about how to determine the location and movement of objects, as well as how to associate colors and wavelengths with specific objects or targets. It is mentioned that remote sensing is more than just taking satellite photographs and requires expertise to interpret the images. The conversation also touches on the use of remote sensing in military purposes, such as bomb targeting. It is noted that satellite images cannot see inside the Earth and can sometimes be misleading, as seen in the example of accidentally bombing the wrong target. The conversation ends with the reminder that remote sensing is not just about taking satellite images, but also involves interpretation and analysis.
  • #1
Huma waseem
22
0
After studying a little bit about the remote sensing i have a Question to ask that If i have a object inside the earth, on the Earth at rest and on the Earth which is moving how can i determine my Object on the earth?What sort of difference may i have to make in my satellite that to observe such different type of the Objects... and if any object is moving and i am not taking aerial photographs of them how can i differentaite between moving and Rest object?
what will be the shape of my spectrum and how could i make it possible for my satellite to assosiate some color with that particular object.. let suppose i have to detect a person in the Earth say any terrorist etc so what will the first thing i will assosiate with that person to detect him... either a color of some specific wavelength but it sounds so confusing that to do that isnt?may be possible that same radiation may be emitted by some other object that time...
please help me it is very confusing for me ...
 
Physics news on Phys.org
  • #2
I will try and understand.
Remember remote sensing means much more than just satelite photographs.

Usually the images are still photographs, to show an object is moving you would take a photograph of the same area later and see what has changed.
There is a google Earth image showing multiple images of the same plane landing at an airport.

You can use different wavelengths to tell the difference between different materials. Usually infrared is used because water has a strong effect in the infrared and so it can be used to show where plants are growing and different kinds of plants.
Although spy movies show infrared heat from a person, remote sensing satelites wouldn't pick up such a small signal. Although they can spot if a ships engines are running or heat from vehicles. It is easy to spot a person on infrared from an aircraft.

Recognising objects from poor resolution satelite images especially taken under bad weather conditions or from odd angles is a real art - goverments have experts who have spent years learning this, it isn't like in the James Bond movies!
 
Last edited:
  • #3
so it means we take a couple of pictures to make it sure the particular object is moving after some time ... Ohkey !
Sir but if the object is inside the Earth and on the Earth what should be the right choice of selecting the wave for them and for Weapon and Mines detection i think it is related to to millitay satellites... i have seen somewhere the hyperspectra satellite also use in millitary purpose... i have heard that if i have to drop a bomb on certain target i use pictures via remote sensing satellites and they exactly drop there.but the problem is still there how to Determine the Target on Earth Via Remote sensing satellites ... and how will i know that if i am getting say Dark Blue at some spot so that is that target which in i am interested,how can i Give such information to my satellite ...?
 
  • #4
Satelites don't see INSIDE the earth.
It is sometimes possible to find things under the Earth from pictures, you can find archeology by seeing where crops don't grow as high because there are old stones under the ground.
Satelite pictures are just used as maps to decide where a target is, the satelite doesn't drop bombs on them and there isn't a particular color of targets.
And you have to be careful, the USA accidentallly bombed the chinese embasy in one country because the real target had moved house to a different address - a satelite cannot tell you that!
 

1. What is remote sensing and how does it work?

Remote sensing is the collection of data about objects or phenomena on Earth's surface from a distance. This is typically done using sensors mounted on satellites or aircraft. These sensors detect and measure energy that is reflected or emitted from the Earth's surface, and this data is then used to create images and maps.

2. What types of objects can be detected using remote sensing?

A wide range of objects can be detected using remote sensing, including natural features such as land, water, and vegetation, as well as human-made objects like buildings, roads, and vehicles. Remote sensing can also be used to detect and monitor changes in the environment, such as deforestation, urbanization, and natural disasters.

3. How accurate is remote sensing in detecting objects on Earth?

The accuracy of remote sensing depends on several factors, including the type of sensor used, the resolution of the data, and the expertise of the person interpreting the data. Generally, newer and more advanced sensors can provide higher accuracy. Additionally, ground truth data and validation techniques can be used to improve accuracy.

4. What are the benefits of using remote sensing for detecting objects on Earth?

Remote sensing offers many benefits, including the ability to collect data over large areas quickly and at a relatively low cost. It also allows for the monitoring of objects or phenomena in remote or inaccessible areas. Additionally, remote sensing data can be used for various applications, such as land-use mapping, environmental monitoring, and disaster response.

5. Are there any limitations to remote sensing in detecting objects on Earth?

While remote sensing has many advantages, it also has some limitations. For example, weather conditions such as clouds and fog can obstruct the view of the Earth's surface and affect data quality. Additionally, certain objects or phenomena may be challenging to detect accurately using remote sensing, such as small or hidden features. However, advancements in technology and data processing techniques are continually improving the capabilities of remote sensing.

Similar threads

  • Other Physics Topics
Replies
2
Views
1K
  • Classical Physics
Replies
13
Views
719
  • Astronomy and Astrophysics
Replies
12
Views
1K
Replies
12
Views
864
  • Advanced Physics Homework Help
Replies
18
Views
2K
  • Astronomy and Astrophysics
Replies
3
Views
1K
Replies
36
Views
3K
  • Electrical Engineering
Replies
7
Views
940
  • Special and General Relativity
2
Replies
36
Views
2K
  • Sci-Fi Writing and World Building
Replies
32
Views
4K
Back
Top