Data compression

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Question 17
Medium

A remote weather station transmits two data streams to a central server:

  • Stream 1: Hourly atmospheric pressure and temperature readings stored as highly precise numerical values.
  • Stream 2: A continuous live webcam video stream of the sky to monitor cloud cover.

Which statement correctly identifies the most appropriate compression method for each stream, along with the correct technical justification?

Stream 1: Run-Length Encoding (a lossy technique), because sequential identical readings can be permanently discarded. Stream 2: Huffman coding (a lossy technique), because frequent pixel values are mapped to shorter binary codes.

Stream 1: Lossless compression, because precise numerical readings must be reconstructed bit-for-bit to prevent scientific errors. Stream 2: Lossy compression, because minor visual artifacts in the cloud monitor are acceptable, and lossy compression achieves much higher compression ratios.

Stream 1: Lossy compression, because numerical readings contain high-frequency noise that can be discarded without affecting scientific validity. Stream 2: Lossless compression, because video frames require absolute pixel-level fidelity to prevent metadata corruption.

Stream 1: Lossless compression, because it permanently deletes redundant bits, eliminating the need for a decompression stage. Stream 2: Lossy compression, because it utilizes error-detection codes to perfectly restore any discarded image data upon receipt.

Data compression Questions

  1. GCSE
  2. /Computer Science
  3. /Data compression