Search found 158 matches

by asdc_user_services
Tue Jan 07, 2020 1:24 pm America/New_York
Forum: Questions/Comments
Question: What is the Space Oblique Mercator (SOM) projection?
Replies: 1

Re: What is the Space Oblique Mercator (SOM) projection?

SOM is a space-based map projection in which the reference meridian nominally follows the spacecraft ground track. It provides a mapping from latitude and longitude to a coordinate system that is approximately aligned with the MISR swath. SOM was used because it minimizes distortion and resampling e...
by asdc_user_services
Tue Jan 07, 2020 1:23 pm America/New_York
Forum: Questions/Comments
Question: MISR image widths
Replies: 1

Re: MISR image widths

The nadir camera Level 1 images have a swath width of about 376 km, compared to 414 km for the off-nadir cameras. The widths are different because the focal lengths of the MISR cameras change in relationship to the varying distance to the Earth for the different cameras. When viewing the same Earth ...
by asdc_user_services
Tue Jan 07, 2020 1:20 pm America/New_York
Forum: Questions/Comments
Question: MISR coverage discrepancies
Replies: 1

Re: MISR coverage discrepancies

There are three reasons that the ground coverage of two MISR images within the same path and block may differ. The position and pointing of the Terra satellite can vary by a small amount from orbit to orbit. For instance, the position is allowed to vary by no more than 20 km from one overpass to the...
by asdc_user_services
Tue Jan 07, 2020 1:18 pm America/New_York
Forum: Questions/Comments
Question: Where can I obtain MISR imagery?
Replies: 1

Re: Where can I obtain MISR imagery?

MISR imagery can be obtained from Collections of MISR Imagery, which includes Browse images, and from MISR Supported Field Campaigns
by asdc_user_services
Tue Jan 07, 2020 1:13 pm America/New_York
Forum: Questions/Comments
Question: What is the quality of the MISR data products?
Replies: 1

Re: What is the quality of the MISR data products?

Intensive assessment of MISR product data quality is an ongoing activity. Focused studies of some parameters are completed. Quality designators indicate the maturity of products and individual parameters. A product may contain parameters at varying quality levels. Below are the Maturity Level defini...
by asdc_user_services
Tue Jan 07, 2020 1:06 pm America/New_York
Forum: Questions/Comments
Question: What is MISR's File Naming Convention?
Replies: 1

Re: What is MISR's File Naming Convention?

An example of MISR's file naming convention is: MISR_AM1_GRP_TERRAIN_GM_Pxxx_Oxxxxxx_XX_Fnn_nnnn.hdf, where MISR = Instrument Name AM1 = Satellite Name GRP_Terrain_GM = Georectified Radiance Product Terrain (Land Surface) Global Mode Pxxx = Path Number Oxxxxxx = Orbit Number XX = Camera Fnn = Format...
by asdc_user_services
Tue Jan 07, 2020 1:05 pm America/New_York
Forum: Questions/Comments
Question: MISR format version, product version, and collection
Replies: 1

Re: MISR format version, product version, and collection

The format Version is used to distinguish between software deliveries to ASDC that result in a product format change. The format version is given in the MISR data file name using the designator _Fnn_ where nn is the version number. The product version is given in the MISR data file name using the de...
by asdc_user_services
Tue Jan 07, 2020 1:03 pm America/New_York
Forum: Questions/Comments
Question: MISR data products
Replies: 1

Re: MISR data products

See the MISR Project Guide. Also, the MISR Data Products Specifications. The theory behind the algorithms used to process MISR data is in the Algorithm Theoretical Basis Documents (ATBD).
by asdc_user_services
Tue Jan 07, 2020 1:00 pm America/New_York
Forum: Questions/Comments
Question: MISR view angles
Replies: 1

Re: MISR view angles

Zenith angles are positive values measured from the local vertical at each point. Azimuth angles are measured clockwise from the direction of travel to local north. For both the Sun and cameras, azimuth describes the direction in which the photons are traveling. According to this convention the sola...
by asdc_user_services
Tue Jan 07, 2020 12:59 pm America/New_York
Forum: Questions/Comments
Question: Where can I find spectral response information for the MISR bands?
Replies: 1

Re: Where can I find spectral response information for the MISR bands?

Bands 1-4 are blue, green, red, and near-infrared, respectively. Variations in spectral response from one camera to another, for the same band, are minor and a standardized, downloadable spectral response curve in text format for each of the bands is available. Summary spectral response information ...