Search found 158 matches

by asdc_user_services
Tue Jan 07, 2020 12:54 pm America/New_York
Forum: Questions/Comments
Question: What is the spatial sampling of MISR?
Replies: 1

Re: What is the spatial sampling of MISR?

The nine MISR cameras acquire measurements every 275 m across track (250 m for the An camera). However, the data rate that would be required to transmit all the measurements from the nine cameras in the four spectral bands at that full resolution would exceed the capacity allocated to the MISR instr...
by asdc_user_services
Tue Jan 07, 2020 12:52 pm America/New_York
Forum: Questions/Comments
Question: What is the geographic coverage of MISR?
Replies: 1

Re: What is the geographic coverage of MISR?

The MISR instrument continuously acquires data everywhere on Earth, but with a frequency that is dependent on the latitude of the location of interest. Indeed, due to the overlap of the swathes near the poles and their wide separations at the equator, repeat coverage varies from 2 to 9 days, respect...
by asdc_user_services
Tue Jan 07, 2020 12:52 pm America/New_York
Forum: Questions/Comments
Question: What is a MISR block?
Replies: 1

Re: What is a MISR block?

The generic data file for MISR is a swath, i.e., a set of measurements for the entire area observed during the day part of the orbit. This is a very large amount of data. To simplify the storing and processing of these data, swathes are broken into a series of predefined, uniformly-sized boxes along...
by asdc_user_services
Tue Jan 07, 2020 12:49 pm America/New_York
Forum: Questions/Comments
Question: What is a MISR path?
Replies: 1

Re: What is a MISR path?

Since the orbits of the Terra platform repeat themselves every 233 revolutions around the Earth, it is natural to name each of these different trajectories or paths. For MISR, the path is the generic name (actually the numeric label) of all orbits that observe the same areas under the same nominal a...
by asdc_user_services
Tue Jan 07, 2020 12:45 pm America/New_York
Forum: Questions/Comments
Question: What is a MISR orbit?
Replies: 1

Re: What is a MISR orbit?

The Terra platform that carries MISR and other scientific instruments flies at an altitude of 705 km above sea level on a sun-synchronous orbit. It revolves once around the planet in 98.88 minutes and thus completes about 14.5 revolutions per day. In the context of MISR data exploitation, each compl...
by asdc_user_services
Tue Jan 07, 2020 12:44 pm America/New_York
Forum: Questions/Comments
Question: What is the MISR swath?
Replies: 1

Re: What is the MISR swath?

The instantaneous swath of any imaging instrument, including MISR, is the width of the region that is actually observed across the track of the instrument at any time during any particular overflight. The instantaneous swathes of the cameras on the MISR instrument vary from 376 to 414 km, but the in...
by asdc_user_services
Tue Jan 07, 2020 12:37 pm America/New_York
Forum: Questions/Comments
Question: How are the nine MISR cameras arranged?
Replies: 2

Re: How are the nine MISR cameras arranged?

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by asdc_user_services
Tue Jan 07, 2020 12:36 pm America/New_York
Forum: Questions/Comments
Question: How are the nine MISR cameras arranged?
Replies: 2

Re: How are the nine MISR cameras arranged?

MISR employs nine discrete cameras pointed at fixed angles. MISR's cameras are named Df, Cf, Bf, Af, An, Aa, Ba, Ca, and, Da, beginning with the most forward-viewing oblique camera and ending with the most aft-viewing oblique camera. The initial letter (A, B, C, D) denotes the focal length of the ca...
by asdc_user_services
Tue Jan 07, 2020 12:34 pm America/New_York
Forum: Questions/Comments
Question: MISR camera angles?
Replies: 1

Re: MISR camera angles?

Measuring the reflectance of a target from different directions is really useful because geophysical media (the atmosphere, including the clouds and aerosols, the ocean, and terrestrial surfaces such as soil, vegetation and snow or ice) reflect solar light differently in different directions. In fac...
by asdc_user_services
Tue Jan 07, 2020 12:32 pm America/New_York
Forum: Questions/Comments
Question: Where can I find information about the MISR instrument?
Replies: 1

Re: Where can I find information about the MISR instrument?

See the MISR web site, and also Diner, D. J. et al. "Performance of the MISR Instrument During Its First 20 Months in Earth Orbit", IEEE. Trans. Geosci. Rem. Sens. 40 (7), 1449-1466 (July 2002).