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<br />I <br />I <br />I <br /> <br />Images Pul/.Down Menu <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />'I <br />I <br />I <br />I <br />,I <br /> <br />4.0 <br /> <br />Images Pull-Down Menu <br /> <br />The ArcView GIS Users Manual defines an image as a type of spatial data where a single piece of <br />information is stored in each pixel. Since only one piece of information is stored in each pixel, images, <br />unlike map themes, don't have attribute tables. In SPMAP, satellite imagery and quads are stored as images. <br /> <br />4.1 USGS Quads <br /> <br />Quads were purchased from the U.S, Geological Survey in digital raster graphics (DRG) format. Quads <br />were clipped of collar information and assembled to create a seamless coverage. The coverage is projected <br />in UTM coordinates and clipped to the area of interest. <br /> <br />4.2 WD64 82 ft. Color <br /> <br />The 82 feet color imagery was obtained from a satellite placed in orbit by the United States Government. <br />This satellite is commonly referred to as Landsat 5. The Landsat imagery has the following parameters. <br /> <br />. multispectral <records reflected energy in the green, blue, red, near infrared, middle infrared, far <br />infrared and thermal bands) <br /> <br />. spatial resolution of 82 feet <br /> <br />The Landsat imagery that is used for SPMAP is one image that was obtained September 4, 1996. Bands <br />4, 3, and 2 are displayed using the red, blue and green video guns resulting in a pseudo infrared color <br />scheme. The imagery was processed by the Northern Colorado Water Conservancy District in 1996. <br /> <br />4.3 WD64 164 ft. Color <br /> <br />The] 64 feet color imagery was created by utilizing a cubic convolution algorithm (utilizing the 16 <br />nearest neighbors) on the original 82 feet Landsat imagery. <br /> <br />The Landsat imagery that is used for SPMAP is one image that was obtained September 4, 1996. Bands <br />4, 3, and 2 are displayed using the red, blue and green video guns resulting in a pseudo infrared color <br />scheme, The imagery was processed by the Northern Colorado Water Conservancy District in 1996. <br /> <br />4.4 WD64 164 ft. B & W <br /> <br />The 164 feet grayscale was created by utilizing a cubic convolution algorithm (utilizing the 16 nearest <br />neighbors) on the original 5 meter IRS-I C imagery. <br /> <br />Version 1.4 <br /> <br />15 <br /> <br />USGS Quads <br />