Summit County, Ohio GIS 1994 Topo Data DVD Overview By: Summit County Geographic Information Services Date: May 25, 2004 Note: This file is best viewed in a terminal window or text editor a minimum of 72 characters wide using a mono-spaced font. Introduction ------------------------------------------------------------------------ The Summit County GIS 1994 Topo Data DVD has been created for easy distribution of topographic GIS data to requesting public institutions, individuals, and businesses. Data contained herein can be utilized in most major commercial GIS and CAD software packages with little or no conversion. Data contained on this disc were compiled from the 1994 aerial photography and topographic mapping project and reflect Summit County at the time of photography. The Jurisdictions layer has been included for navigational assistance in locating a particular area of interest within the county. See the metadata for detailed descriptions, use restrictions, and contact organization for each data layer. Suggested Internet Links ------------------------------------------------------------------------ Environmental Systems Research Institute (ESRI) - http://www.esri.com LizardTech - http://www.lizardtech.com Autodesk - http://www.autodesk.com Summit County GIS website - http://scids.summitoh.net/gis/default2.htm Federal Geographic Data Committee (FGDC) - http://www.fgdc.gov Ohio Geographically Referenced Information Program (OGRIP) - http://www.das.ohio.gov/ITSD/ESS/OGRIP/Index.htm Open GIS Consortium (OGC) - http://www.opengis.org Contents ------------------------------------------------------------------------ I. DXFs II. Images III. Metadata IV. Shapefiles V. Software I. DXFs ------------------------------------------------------------------------ Contains data in Drawing Exchange Format (DXF). Files with names that end in _anno.dxf are annotation layers that relate to a shapefile layer with a similar name (for instance, contours94_anno.dxf goes with the contours94 shapefile dataset). Topo_DXFs94_Tiled.zip contains all the topographic and annotation layers on this disc, broken into a tiling schema as indicated by the index_tiles94.dxf file. Each tile has one DXF file containing all the topographic and annotation layers combined. Free and commercial software is available on the Internet for most computer platforms that can extract the DXF files from the Zip archive. II. Images ------------------------------------------------------------------------ Contains digital orthophotos in Mr. SID format. Each image file has an accompanying SDW file that references the image to its geographic location. MrSIDs_Catalog94.dbf is a database catalog of all the image files for use with ESRI GIS software. Mr. SID is a proprietary image compression format developed by LizardTech, Inc. that allows a 72MB TIFF orthophoto to be compressed to under 2MB with little loss of image quality. Free viewers that can convert Mr. SID back to TIFF format are included on this disc (see Section V.). III. Metadata ------------------------------------------------------------------------ Contains information about each data layer on the disc. Files are in HTML format readable by any W3C-compliant application, and meet FGDC minimum standards for metadata. The HTML files are direct exports of the XML metadata files that accompany each dataset on this disc (see Section IV.). IV. Shapefiles ------------------------------------------------------------------------ Contains data in ESRI Shapefile format. Each shapefile dataset is made up of the following files: SHP - Spatial definitions for the objects in the dataset. SHX - Spatial index. DBF - dBase file containing attribute data linked to the SHP file. PRJ - Text file containing a geographic projection definition. XML - XML file containing FGDC-compliant metadata for viewing in ESRI's ArcCatalog. Recommended stylesheet is FGDC Classic. V. Software ------------------------------------------------------------------------ Contains free software that may be useful for viewing the file formats on this disc. Not all of the applications will read all of the data on this disc. A full-featured GIS or GIS-capable CAD application is highly recommended for effective use of these data. All software included on this disc is provided as-is with no guarantee of compatibility with the end-user's computer system(s). Summit County Geographic Information Services does not provide technical support for any of the included software. For assistance, please contact the publisher of the software as indicated in the software's accompanying documentation. Summit County, Ohio, assumes no legal responsibility for any data loss or damage incurred by the end-user from installing any of the included software. Included ESRI software: ----------------------- Microsoft Windows -> ae2setup.exe - ArcExplorer 2.0 for Windows. Windows Zip_ae401java_JRE.zip - ArcExplorer 4.0.1 for Java. Linux -> ArcExplor4.0.1_linux.tar.Z - ArcExplorer 4.0.1 for Java. Apple Macintosh OSX -> AE4Java.sit - ArcExplorer 4.0.1 for Java ArcExplorer for Java is also available for several commercial UNIX platforms. See http://www.esri.com/software/arcexplorer/index.html for download and installation information. ArcExplorer 2.0 for Windows reads all data formats included on this disc. ArcExplorer for Java will not read Mr. SID images or DXF files. Sample project files for each version have been included in this disc's root directory (AE2_topo94.AEP for ArcExplorer 2.0 and AE4_topo94.AXL for ArcExplorer for Java). Included LizardTech software: ----------------------------- setup.exe - Mr. SID GeoViewer for Windows MrSID_linux2.0.32.tar.Z - Mr. SID GeoViewer for UNIX and Linux LizardTech also distributes a free Mr. SID viewer plug-in for several web browsers on Microsoft Windows, with similar functionality to the GeoViewer. See http://www.lizardtech.com for more information. End of README.TXT