A2

• Raster data

  Composed of cells in a matrix
• Vector data

  Composed of XY coordinates (vertices) that define the shape of an object
• Raster data

  Uses a series of cells to represent locations on the earth
• Vector data

  Uses points and line segments to identify locations on the earth
• The figure represents vector (left) versus raster (right) data
• Metadata

  Data providing information about one or more aspects of the data, used to summarize basic information about data that can make tracking and working with specific data easier
• Usefulness of metadata in Remote Sensing and GIS

  • Enables users to efficiently search for relevant spatial data
  • Assess its suitability for specific applications
  • Determine whether it aligns with their research or project needs
• Basic elements of the raster data model

  • Cell value - each cell carries a value representing a spatial phenomenon
  • Cell size - determines the resolution of the raster data
  • Raster bands - a raster may have a single or multiple bands
  • Spatial reference - raster data must have spatial reference information to align with other data sets