The second goal is to revisit the iFOV problem and to propose an alternative and simpler approach.
We emphasize that these algorithms play a crucial role in the solution of the iFOV problem and remarkably improve the approximation of the FOV's boundary.
To obtain these data in a relatively short time, soil moisture within the antenna IFOV is changed by artificial watering method.
Step 1: the surface within IFOV is discretized as the small area with a fixed spatial interval of [DELTA]x, and [DELTA]x is 1/30 [P.sub.rs] ([P.sub.rs]: row spacing) here.
In order to get the observation data used to validate the QRSP, the challenging problem is that the IFOV of the instrument is usually much smaller than the IFOV of the sensor from which the QRSP is retrieved.
Figure 3 shows the schematic sketch of the simultaneous observation which combines the satellite, exemplified by Landsat thematic (TM) sensor with an IFOV of 30 m, and the manual instrument on the ground, exemplified by thermal infrared radiometer with an IFOV of 0.5 m at a height of 1 m.
Particularly valuable was the knowledge base developed pertaining to IFOV
characteristics and illumination effects on survey imagery.
The instantaneous FOV (IFOV
) is a measure of the spatial resolution of a camera's focal plane array (FPA) detector and stated in terms of individual detector elements or pixels.
For every Instantaneous Field of View (IFOV
) on the ground (a 30 X 30 m pixel), each Landsat TM sensor records a measure of the radiation intensity, called a Digital Number (DN).
Some electronic warfare applications, however, demand wide instantaneous fields of view (IFOV
) in addition to broadband reception.
The GPM mission will provide four levels of data products: 1) level 1 data consisting of geolocated, calibrated DPR radar power, GMI brightness temperatures, and intercalibrated brightness temperatures from partner radiometers at the instantaneous field of view (IFOV
); 2) level 2 products consisting of geolocated, geophysical data (e.g., precipitation rates) and DPR reflectivities at the IFOV
; 3) level 3 products consisting of gridded time-space sampled geophysical data (including latent heating estimates) from the GPM Core sensors and partner radiometers; and 4) level 4 products consisting of merged remotely sensed and model information.