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Aerosol Measurement and Remote Sensing - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment that explores how aerosols affect our health and how aerosols in the atmosphere are measured. It explains remote sensing and its two types with examples.

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How do aerosols affect our health? 00:00:00
What is remote sensing? 00:00:06
Name and describe the two types of remote sensing and give examples of each. 00:00:08
How are aerosols in the atmosphere measured? 00:00:12
Studying the atmosphere is a fairly new science. 00:00:17
In the chemistry and dynamics branch of NASA Langley Research Center, atmospheric scientists 00:00:20
are trying to determine how many aerosols there are and where they are in the atmosphere. 00:00:25
Now these aerosols are important because they affect our health. 00:00:31
Small aerosols can enter our lungs as we breathe polluted air. 00:00:34
These aerosols can be deposited deep in our lungs, blocking the lungs' ability to exchange 00:00:38
oxygen and carbon dioxide. 00:00:44
Over time, this makes it hard to breathe. 00:00:46
Here at NASA Langley, we measure aerosols using a technique called remote sensing. 00:00:49
What is remote sensing? 00:00:54
Remote sensing is collecting information about an object without physically touching the 00:00:57
object. 00:01:00
It's learning without touching. 00:01:01
The most familiar kind of remote sensing is the use of our eyes to detect a distant object. 00:01:04
We also learn without touching when we hear. 00:01:09
For example, when a car beeps its horn, we hear it from a distance and sense we're in 00:01:12
danger. 00:01:18
Get out of the street! 00:01:19
So now, there are two types of remote sensing, active and passive. 00:01:20
An early example of passive remote sensing involved the use of a camera. 00:01:25
In 1858, the first aerial photograph of land was taken from a balloon floating over Paris, 00:01:29
France. 00:01:35
This is called passive because the camera uses only the light from the sun to record 00:01:36
the image on film. 00:01:40
On the other hand, active remote sensing uses its own light source. 00:01:42
Put a flash on the camera and you've made it active because the light from the flash 00:01:46
reflects off the distant object being photographed. 00:01:51
Using active remote sensing, you can take pictures whenever you want because you don't 00:01:54
have to depend on the sun to give you light. 00:01:58
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Idioma/s:
en
Materias:
Matemáticas
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
302
Fecha:
28 de mayo de 2007 - 16:53
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 01″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
12.21 MBytes

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