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SYSTEM DESCRIPTION <br /> NR <br /> Mapsets.A mapset is a type of image layer. It contains .bmp or .jpg file extensions. <br /> MrSIDs/JP2.If your site uses a MrSID or JP2 image layer,MapTrak can be configured to display <br /> the images in one of two ways: 1)the images are always displayed or 2)the program displays a <br /> grid, allowing you to select the image(s)you want to view. This configuration depends upon the <br /> number of MrSID or JP2 image files used by your site. For example, if your site has a large num- <br /> ber of MrSID or JP2 image files,MapTrak is configured to display a grid. If your site has only a <br /> few image files,the program is configured to always display the images. <br /> • MrSID is an acronym for Multi-resolution Seamless Image Database. MrSID is a power- <br /> ful wavelet-based image compressor,viewer, and file format for massive raster images. <br /> MrSID enables instantaneous viewing and manipulation of images locally and over a net- <br /> work,while maintaining maximum image quality.This type of image compression is good <br /> to use because it can compress raster images of virtually any size without any noticeable <br /> reduction in image quality.Additionally,this type of compression allows large amounts of <br /> raster images to be quickly transmitted over a network. MrSID files have a file extension <br /> of.sid. <br /> • JP2 refers to the file extension for image files in the new JPEG2000 image format. The <br /> JPEG2000 image format is based on state-of-the-art wavelet compression. JPEG2000 is <br /> intended to provide low bit rate operation with rate-distortion and subjective image quality <br /> performance superior to existing standards,without sacrificing performance at other <br /> points in the rate-distortion spectrum. JPEG2000 is able to handle up to 256 channels of <br /> information,as compared to JPEG,which is limited to only RGB data.Thus,JPEG2000 is <br /> capable of describing complete alternate color models, such as CMYK, and full ICC <br /> (International Color Consortium). <br /> Point Data. A Point Data layer is generally data exported from another program into a delimited <br /> file, such as a comma-delimited file or a LogiSYS Geographic Data Analysis ("GDA") file.A <br /> comma-delimited file has a .csv extension and the LogiSYS GDA file has a .gda extension. This <br /> type of information can be added to the map. <br /> Shape Files. Shape files correspond to the objects listed in the Map Legend area of the MapTrak <br /> window. As such,MapTrak is initially setup to use these files. Therefore,this image layer does <br /> not need to be added to the map. (See page 1-98.) <br /> ESRI Data. The layers of the map are contained in an .mdb or .sde database.ESRI must be <br /> installed for the data to show. <br /> FIELDS AND BUTTONS <br /> Data Source Scrolled list box.Displays the available map image layers,point data, and <br /> shape files. <br /> 01/18/10 1-33 <br />