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5.7. Metadata |
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The Level-1B metadata structure is the same as the previously described Level-1A product.
Some important notes for the Level-1B metadata are shown below.
Note 1: Scene Four Corners
Relationship between the four corners locations and coordinates is shown in Figure 5-10.
The scene four corners data are values of VNIR, SWIR, and TIR for full mode, S+T mode, and T only mode, respectively.
A more detailed definition is shown in Table 5-5.
Figure 5-10 Relationship between four corners location and coordinates
(Note: Position data are values at pixel centers)
Table 5-5 Detailed Definition of Four Corners Data
Subsystem
(Observation Mode) |
Four Corners |
Coordinates Location
(pixel, line) |
VNIR
(Full Mode) |
Upper Left |
(0,0) |
| Upper Right |
(4980,0) |
| Lower Left |
(0,4200) |
| Lower Right |
(4980,4200) |
SWIR
(S+T Mode) |
Upper Left |
(0,0) |
| Upper Right |
(2490,0) |
| Lower Left |
(0,2100) |
| Lower Right |
(2490,2100) |
TIR
(T Only Mode) |
Upper Left |
(0,0) |
| Upper Right |
(830,0) |
| Lower Left |
(0,700) |
| Lower Right |
(830,700) |
Npte: that the right pixel and the lower line are outside of defined scene area by one value
The latitude values in the four corners data are expressed using geodetic coordinates.
Note 2 : Map Orientation Angle
Map orientation angle in metadata is the exact angle between the path-oriented image and the map-oriented image.
The map-oriented image can be easily generated by rotating the path-oriented image through the map orientation angle as shown in Figure 5-11.
Figure 5-11 Transformation from path-oriented image to map oriented image using Map Orientation Angle in Metadata
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