In a Survey of India topographic map of scale 1:50,000, the contours are drawn conventionally at intervals of __________ m.
Match the following errors (Column 1) in spatial data digitization with their descriptions (Column 2).
| Column 1 | Column 2 |
|---|---|
| (P) Mis-located entities | 2) Points, lines or boundary segments digitized in wrong place |
| (Q) Missing labels | 4) Undefined polygons |
| (R) Artefacts of digitization | 3) Undershoots, overshoots, wrongly placed nodes, loops or spikes |
| (S) Duplicate labels | 5) Two or more identification labels for same polygon |
| (T) Duplicate entities | 1) Points, lines or boundary segments digitized twice |
The reflectance geometry of white-sky albedo can be represented as __________
Clouds appear white in optical visible spectral bands of remote sensing images due to _________ scattering.
If the emissivity of an object varies with wavelength, it is called as __________