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Data Interview Question

Cost Estimation for Google Earth Image Storage

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Understanding the Requirements

  1. Identify the Scope of Photos:

    • Determine whether the focus is on satellite photos, street view photos, or user-uploaded images. For this exercise, we'll focus on satellite photos.
  2. Frequency of Image Capture:

    • Establish how often images are captured. Assume annual captures since Google Earth launched in 2008.
  3. Image Details:

    • Clarify the resolution and size of each image. Assume a standard photo size of 1000 x 1000 pixels, equating to 5 MB.
  4. Geographical Coverage:

    • Confirm the total area to be covered, including both land and water, though primarily focusing on land for practical purposes.
  5. Storage Duration:

    • Determine if images are stored indefinitely or for a specific duration. Assume indefinite storage for this calculation.
  6. Cost Factors:

    • Consider the cost per GB of storage, taking into account potential discounts for bulk storage by large companies like Google.