DOQQ stands for Digital Orthophoto Quarter Quadrangle and is a computer generated image derived from an aerial photograph that has been manipulated to remove image displacement caused by the relief of the terrain and the position of the camera. The USGS makes both grayscale and color-infrared DOQQs covering a quarter of a 7.5 minute quad or approximately four miles across the top by just over four and a half miles on the side. This infrared DOQQ was made of the lower Colorado River near Lago Vista TX as part of a flood study.
No comments:
Post a Comment