7.1.1 Resolution

The Resolution slider controls how much of the data in a satellite image file is actually used to perform the rendering. If this slider is set at 1, all of the data is used. For each 1 point this value is increased, one pixel is skipped in each direction. For instance, if this value is 3, every third pixel in each scan line is used, and only every third scan line is used. The purpose of reducing the resolution is to allow the user to render a swath quickly with less detail. Rendering a high-resolution satellite image at full resolution can be time consuming. In addition, the data being displayed may be of much higher resolution than the screen on which it is being drawn. In that case, increasing the resolution value will speed up drawing and have little or no effect on the perceived resolution of the image. Note that changing the resolution has no effect on previously rendered images unless you recompute the swath.


Note: Zooming into an image very tightly at less than full resolution can cause data points to drop out. Such occurrences manifest themselves as empty rectangles on the screen. Zooming in very tightly can cause all points to be dropped out. The solution is to increase the resolution or zoom out.