Remote Sensing and Image Processing

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Across
  1. 4. A graph showing the distribution of values in a set of data. Individual values are displayed along a horizontal axis, and the frequency of their occurrence is displayed along a vertical axis.
  2. 5. The downslope direction of the maximum rate of change in value from each cell to its adjacent area.
  3. 6. An image processing method for combining multiple images into a single raster, where each image or band has the same extent and/or resampled resolution.
  4. 10. The digital representation of the land surface elevation with respect to any reference datum. These layers are frequently used to refer to representation of a topographic surface.
  5. 13. The energy that moves through space at the speed of light as different wavelengths of time-varying electric and magnetic fields. Types of electromagnetic radiation include gamma, x, ultraviolet, visible, infrared, microwave, and radio.
  6. 15. A series of pixels without data, often represented by value that is not valid elsewhere in the dataset.
  7. 17. An airborne drone with sensor.
  8. 21. A multiband image generated from a combination individual raster bands (e.g. false colour).
  9. 23. The mean distance between maximums (or minimums) of a roughly periodic pattern on the electromagnetic spectrum. It is normally measured in micrometres (um) or nanometres (nm).
  10. 24. An active optical remote-sensing technique that uses laser light to densely sample the surface of the earth, producing highly accurate X, Y and Z measurements.
  11. 25. The minimum bounding area of a map or raster. All source data fall within this boundary.
  12. 26. A band of the electromagnetic spectrum ranging from approximately 700 nm to 2500 nm.
  13. 32. The application of geometric rules to find the length of a line, area of a surface, or volume of an object using the information obtained from lines and angles.
  14. 33. The fundamental unit of data collection. This is represented in a remotely sensed image as a cell in an array of data values.
  15. 34. A matrix of cells (or pixels) organized into row and columns where each cell contains a value representing information.
  16. 36. The internal sub-setting of a spatial dataset, especially a raster, typically used to process or analyse a large dataset without consuming vast quantities of computer memory.
  17. 37. The computational process of assigning pixels or objects into a set of categories, or classes, having common spectral, shape, elevation, or other definable characteristics.
  18. 39. A standard digital image file format for containing lossy and compressed image data.
Down
  1. 1. A reduced-resolution dataset stored with imagery that is used to read and display imagery at lower resolutions.
  2. 2. A function that takes an image as input and generates an image as output.
  3. 3. A system of radio-emitting and -receiving satellites used for determining positions on the earth. The orbiting satellites transmit signals that allow this receiver to calculate its own location through trilateration.
  4. 7. The study and mapping of land surfaces, including relief (relative positions and elevations) and the position of natural and constructed features.
  5. 8. A measure of the proportion of the incident light or radiation reflected by a specific earth surface.
  6. 9. A data model within a geodatabase used to manage collections of raster datasets stored as a catalogue and viewed as a combined image or individual images.
  7. 11. A term for two or more ranges of frequencies or wavelengths (producing images with specific band combinations) in the electromagnetic spectrum.
  8. 12. A group of multispectral, earth-orbiting satellites developed by NASA that gather imagery for land-use inventory, geological and mineralogical exploration, crop and forestry assessment, and cartography.
  9. 14. An image which is fused with a lower-resolution multiband raster dataset. It is used to increase spatial resolution and better visualise a multiband image.
  10. 16. The process of reducing the size of a file or database. This can improve data handling, storage, and database performance.
  11. 18. The number of oscillations per unit of time in a wave of energy, or the number of wavelengths that pass a point in a given amount of time.
  12. 19. The phenomenon in which, due to viewing angle, one object blocks another object from view in an image.
  13. 20. The degree of contrast between the mid-level grey values of a raster dataset. Application of this correction type allows users to control the overall brightness of a raster dataset, as well as the ratios of red to green to blue.
  14. 22. A process by which imagery is geometrically corrected so that coordinates in the imagery accurately represent coordinates on the ground (i.e. GCPs).
  15. 27. The amount of solar radiation received by an area over a given period of time.
  16. 28. The origin and orientation of lines of latitude and longitude, providing a frame of reference for measuring location on the earth’s surface.
  17. 29. A numerical data type that does not have a set number of digits before and after the decimal point.
  18. 30. The feel or appearance of the surface of an object of interest, used to help identify the object.
  19. 31. A ratio of original bands, sometimes with other factors or coefficients included.
  20. 34. A device or system that detects surface features on the earth by bouncing radio waves off them and measuring the energy reflected back.
  21. 35. A Tagged Image File Format with spatial reference information.
  22. 38. The incline, or steepness, of a surface, measured in degrees from horizontal (0–90), or percent.