Across
- 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.
- 5. The downslope direction of the maximum rate of change in value from each cell to its adjacent area.
- 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.
- 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.
- 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.
- 15. A series of pixels without data, often represented by value that is not valid elsewhere in the dataset.
- 17. An airborne drone with sensor.
- 21. A multiband image generated from a combination individual raster bands (e.g. false colour).
- 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).
- 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.
- 25. The minimum bounding area of a map or raster. All source data fall within this boundary.
- 26. A band of the electromagnetic spectrum ranging from approximately 700 nm to 2500 nm.
- 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.
- 33. The fundamental unit of data collection. This is represented in a remotely sensed image as a cell in an array of data values.
- 34. A matrix of cells (or pixels) organized into row and columns where each cell contains a value representing information.
- 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.
- 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.
- 39. A standard digital image file format for containing lossy and compressed image data.
Down
- 1. A reduced-resolution dataset stored with imagery that is used to read and display imagery at lower resolutions.
- 2. A function that takes an image as input and generates an image as output.
- 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.
- 7. The study and mapping of land surfaces, including relief (relative positions and elevations) and the position of natural and constructed features.
- 8. A measure of the proportion of the incident light or radiation reflected by a specific earth surface.
- 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.
- 11. A term for two or more ranges of frequencies or wavelengths (producing images with specific band combinations) in the electromagnetic spectrum.
- 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.
- 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.
- 16. The process of reducing the size of a file or database. This can improve data handling, storage, and database performance.
- 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.
- 19. The phenomenon in which, due to viewing angle, one object blocks another object from view in an image.
- 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.
- 22. A process by which imagery is geometrically corrected so that coordinates in the imagery accurately represent coordinates on the ground (i.e. GCPs).
- 27. The amount of solar radiation received by an area over a given period of time.
- 28. The origin and orientation of lines of latitude and longitude, providing a frame of reference for measuring location on the earth’s surface.
- 29. A numerical data type that does not have a set number of digits before and after the decimal point.
- 30. The feel or appearance of the surface of an object of interest, used to help identify the object.
- 31. A ratio of original bands, sometimes with other factors or coefficients included.
- 34. A device or system that detects surface features on the earth by bouncing radio waves off them and measuring the energy reflected back.
- 35. A Tagged Image File Format with spatial reference information.
- 38. The incline, or steepness, of a surface, measured in degrees from horizontal (0–90), or percent.