| Environments | PYTHON :: EASI :: MODELER |
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| Name | Type | Caption | Length | Value range |
|---|---|---|---|---|
| DATE* | Integer | Date (day,month,year) | 3 - 3 | |
| TIME* | Integer | Time of day (hour,minute,second) | 2 - 3 | |
| LATI* | Float | Latitude for calculation | 1 - 1 | -90.0 - 90.0 |
| LONGI* | Float | Longitude for calculation | 1 - 1 | -180.0 - 180.0 |
| REPORT | String | Report mode | 0 - 192 | Quick links |
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DATE
Specifies the date for which the solar zenith and azimuth angles will be computed.
TIME
Specifies the time of day for which the solar zenith and azimuth angles will be computed.
If not specified, seconds default to 0.
LATI
Specifies the latitude for which the solar zenith and azimuth angles will be computed.
LONGI
Specifies the longitude for which the solar zenith and azimuth angles will be computed.
REPORT
Specifies where to direct the generated report.
Available options are:
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SOLARZAZ is a utility that facilitates the use of the atmospheric correction system. It outputs the solar zenith and solar azimuth angles for a specified date and time of day, and latitude and longitude coordinates.
The solar zenith angle is the angle between the ground-to-zenith and ground-to-sun directions and can vary from 0 to 180, with 0 being when the sun is directly above the observed ground position.
The solar azimuth angle is the angle between the ground-to-sun and ground-to-North directions, positive clockwise from ground-to-North. The solar azimuth is 0 if the sun is to the North of the observed ground position, 90, if the sun is to the East of the observed ground position, and so on.
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This example demonstrates the use of SOLARZAZ to determine the solar zenith and azimuth angles for an AVIRIS scene.
The image data was acquired by the AVIRIS whiskbroom sensor. The following ancillary data are required for the solar angles calculation:
year 1997, month 06, day 19, hour 20
EASI>date = 19,6,1997 ! date (day,month,year) EASI>time = 20,0 ! time (hour,minute) EASI>lati = 37.70259 ! latitude EASI>longi = -117.20816 ! longitude EASI>run SOLARZAZ
The following report is generated:
Date : 19/6/1997 Time : 20:0:0 Latitude : 37.702591 Longitude : -117.208160 Solar zenith angle : 14.422653 Solar azimuth angle: 189.300247
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PCI Geomatics received financial support from the Canadian Space Agency/L'Agence Spatiale Canadienne through the Earth Observation Application Development Program (EOADP) for the development of this software, under contract 9F028-0-4914/09.
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