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University of Nebraska–Lincoln


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In a raster grid each image is created as an array of value. Each pixel is treated as a separate unit, which can always be located by its' column (x) and row (y) coordinates. Raster data structure offers advantages for manipulation of pixel values by image processing systems, as it is easy to find and locate pixels and their values. Raster grids are used to study a wide variety of images from x-rays to satellite data.

The following three activities are designed for students new to the use of raster girds. The objectives for these activities include:

  1. The students will learn to input values into the NIH Image program by using ClarisWorks(These are the directions given here. Other word processing programs will have different commands and adjustments will have to be made).

  2. The students will use the raster gird to find equal values and patterns in their images.

  3. In order to highlight/isolate a particular data, the students will manipulate the raster gird.

  4. Using NIH Image, the students will convert raster grids into three-dimensional drawings.

  5. The students will gather their own elevation data from a school (or another site depending upon terrain), create a raster grid, and convert this data into a three dimensional drawing.

Activity 1-Creating a Simple Raster

Activity 2-Topography and Surface Profiles

Activity 3-School Site Topography

Teacher Notes