DOCUMENTATION REPORT FOR GIS DATABASE: PUBLIC AIRPORTS IN GEORGIA GEORGIA DEPARTMENT OF NATURAL RESOURCES ENVIRONMENTAL PROTECTION DIVISION GEOLOGIC SURVEY BRANCH Atlanta 1996 DOCUMENTATION REPORT 96-16 Table of Contents OVERVIEW GLOSSARY PART A General Description of the GIS Database 1.0 Identification / Project Background 1 2.0 Data Quality Information 1 2.1 Attribute Accuracy 1 2.2 Logical Consistency 1 2.3 Completeness 2 2.4 Positional Accuracy 2 2.5 Lineage 2 3.0 Spatial Data Organization 2 4.0 Spatial Data Organization Information .3 5.0 Entity and Attribute Information 3 6.0 Distribution Information. 3 7.0 Metadata Reference Information 3 Appendix A. Signatures PART B Technical Description of the GIS Database 1.0 Identification Information 1 1.1 Citation 1 1.2 Description 1 1.3 Time Period of Content 1 1.4 Status 1 1.5 Spatial Domain 1 1.6 Keywords 2 1.7 Access Constraints 2 1.8 Use Constraints 2 1.9 Point Contact 2 1.13 Native Data Set Environment 2 2.0 Data Quality Information 3 2.1 Attribute Accuracy Information 3 2.2 Logical Consistency Report 3 2.3 Completeness Report 3 2.4 Positional Accuracy 3 2.4.1 Positional Accuracy Report 3 2.4.2 Horizontal Positional Accuracy Report 3 2.5 Lineage 3 3.0 Spatial Data Organization Information 5 3.1 Indirect Spatial Reference Method 5 3.2 Direct Spatial Reference Method 5 3.3 Point and Vector Object Information 5 4.0 Spatial Reference Information 5 4.1 Horizontal Coordinate System Definition 5 4.2 Horizontal Coordinate System Definition 6 5.0 Entity and Attribute Information 6 5.1 Detailed Description 6 6.0 Distribution Information 6 6.1 Distributor 6 6.2 Resource Description 6 6.3 Distribution Liability 6 6.4 Standard Ordering Process 6 6.5 Custom Ordering Process 6 7.0 Metadata Reference Information 6 7.1 Metadata Date 6 7.2 Metadata Review Data 6 7.4 Metadata Contact 7 7.5 Metadata Standard Name 7 7.6 Metadata Standard Version 7 PART C Digital Files Containing GIS Database Summary of Contents of Data Diskettes Data Diskettes Jacket OVERVIEW This document is a three-part documentation report for a Geographic Information System (GIS) database developed, with Arc/Info software, by the Geologic Survey Branch, Environmental Protection Division of the Georgia Department of Natural Resources. Part A is intended as a general purpose summary of the database. Part B is a more technical section included primarily for the benefit of GIS processors. Part C is the digital product with the database and associated documentation. The digital documentation includes a digital copy of this paper publication. This documentation report follows the "Content Standards for Digital Geospatial Metadata" (Standards) developed by the Federal Geographic Data Committee (FGDC), published June 8, 1994. As a convenience, Part A and B employ the outline/headings contained in the Standards. Part A and B are printed on paper and Part C is a digital product. Part B meets the technical requirements of the Standards. The digital documentation in Part C contains two copies of this publication. One digital copy is stored as an ASCII file, AIRPRTPT.TXT. The other copy is in WordPerfect 6.0 format. The digital database in Part C consists of an Arc/Info Export file. Copy the file into a directory where you want it and use Arc/Info Import command. See Part C for data file size. The digital files are written to one (1) 1.44 Mb High Density data diskettes. A directory of the files with a short explanation are contained in the ASCII file README.TXT on the data diskettes. This database was developed to satisfy specific project purposes. Users are advised to read the entire Documentation Report and to evaluate the suitability and limitations of the database for the user's purpose. GLOSSARY Arc/Info: a popular GIS software, used by the GGS ASCII: abbreviation for 'American Standard Code for Information Interchange. A set of codes for representing alphanumeric information in a format which any computer can read. attribute: a characteristic of a geographic feature. For example, if the geographic feature is a river, then an attributes of the river are the river name, the flow rate, the chemical history, etc. attribute accuracy: a measure of how well the reported characteristics actually match the real-world characteristics of a geographic feature Compact Disk Read Only Memory (CD-ROM): an optical media which can store 650 Mb of information. completeness: a description of the relation between the items represented in the database and the real world. For example, if a database contains water wells in Georgia, does it contain all the water wells in Georgia, or a defined subset of wells. If the database contains a defined subset of wells, does it contain every well in Georgia that meets the definition by which the subset was chosen. Content Standards for Digital Geospatial Metadata: a standard developed by the FGDC which specifies the information content of metadata for a set of digital geospatial data. database: a logical collection of interrelated information, managed and stored as a unit on a computer or other storage media. A GIS database includes data about the spatial location and shape of geographic features recorded as points, lines, areas, as well as their attributes. decimal degrees: a unit of measure for geographic coordinates. The conversion formula for decimal degrees is: Decimal Degrees = Degrees + Minutes/60 +Seconds/3600 Department of Natural Resources (DNR): a department of the government of the State of Georgia. digital: refers to the process of conversion of information into machine language so that a computer can read, write, store, and process the information. Digital Line Graphs (DLG): computer files from the USGS which contain digital maps of transportation, hydrography, contours, and public land survey boundaries. digital maps: a map is an abstract representation of the physical features of a portion of the Earth's surface graphically displayed on a piece of paper. When that piece of paper is converted into a form which the computer can use, the map is then digital. diskette: a storage medium, usually measuring 3.5 inches in diameter, which is used to store or transfer information from one computer to another. Federal Geographic Data Committee (FGDC): an inter-governmental committee established through the Office of Management and Budget and charged with the responsibility to coordinate various surveying, mapping, and spatial data activities to meet the needs of the Nation. Geographic Information System (GIS): an organized collection of computer hardware, software, geographic data, and personnel designed to efficiently capture, store, update, manipulate, analyze, and display all forms of geographically referenced information. hypsography: the scientific study of the earth's topological configuration above sea level, especially the measurement and mapping of land elevations. label points: a single x, y coordinate which identifies an area, and holds a place in the database wherein the area's attribute information is stored. latitude, longitude: a geographic reference system to locate positions on the Earth. Latitude and longitude are angles measured from the Earth's center to a position on the Earth's surface. Latitude measures angles in a north-south direction, while longitude measures angles in the east-west direction. lineage: information about the events, parameters, and source data which constructed a geographic database, and information about the responsible parties. logical consistency: an explanation of the fidelity of the relationships in the database. For example, for a geographic area, do the vector lines which create area boundaries join to encircle the area with no gaps. Or for example, for a particular attribute, are all the value given within a valid range. longitude, latitude: see latitude, longitude metadata: information about the content, quality, condition, and other characteristics of a database National Map Accuracy Standards: a set of standards developed by the USGS which states the level of accuracy required for a map product of a particular scale. pkzip: a popular data compression software. positional accuracy: an assessment of how well the reported position of a geographic feature represents the real-world position. Tape Archive Retrieval (TAR) - TAR saves and restores files on magnetic tape. United States Geological Survey (USGS): a branch of the United States Department of Interior vector lines: lines which are described by x, y coordinates and are commonly used to represent linear geographic features. Each linear feature is represented as an ordered list of vertices. WordPerfect: a popular word processing software PART A GENERAL DESCRIPTION OF THE GIS DATABASE: PUBLIC AIRPORTS IN GEORGIA 1.0 Identification / Project Background This database contains point data representing 115 airports that the Georgia Department Of Transportation considers open-to-the public airport facilities in Georgia. The database is derived from the 1989, Georgia Airport Directory, a publication prepared and distributed by the DOT's, Bureau of Aeronautics. Private, military and/or emergency airfields are not listed in this database. There are three attributes (Name, City, and a Reference Identification) within the database that describe each point. The intended map scale for the use of this database is 1:100,000 or smaller. The purpose of the database is to provide location data for inclusion on regional and state maps as well as for performing spatial analysis. This database was originally developed to generate an interim proximity (buffer) database of airport locations. This interim buffered database is one of 13 databases used in the construction of a map and database which defines areas that the Environmental Protection Division considers to be geotechnically poorly suited for the construction and/or operation of a municipal solid waste landfill. 2.0 Data Quality Information The following sections describe the data quality of this database. 2.1 Attribute Accuracy There are three attributes within this database: Name, the airport's name; Assoc_city, the name of the city being served by the airport site; Reference Identification, Airprtpt-id, the page number in the source publication where airport information can be found. The attributes are accurately stated for each of the 115 sites as determined by a comparison of the attributes with information from the original source publication, 1989 Georgia Airport Directory, by the DOT's Bureau of Aeronautics. 2.2 Logical Consistency The database for point locations of the airports were plotted onto a map on which the roadways from the Roads database were also plotted. The Roads database is one which has all the county, state, and federal roads and highways within its database, and is derived form the USGS 30 X 60 Minute series, 1:100,000 topographic maps of Georgia. It is this combination of the roadways and the airport points spatial relationship on the map that were compared with the roadways and the airport points spatial relationship of the DOT County Highway Maps. Only one airport point was found to be mislocated and it was Lee Gilmer Memorial of Gainesville. The as-published latitude and longitude for the Gainesville airport placed the airport near Rome Georgia. The error was found to be approximately 1 degree of longitude. A corrected latitude and longitude for the Lee Gilmer Memorial airport was obtained from the center of the intersection of the two runway as depicted on the DOT General Highway Map of Hall County Georgia. 2.3 Completeness The database contains all 115 airport points that are listed in the source publication. 2.4 Positional Accuracy Positional accuracy is unknown, but is estimated to be within +/- one half mile based on comparison with the County DOT General Highway Maps. 2.5 Lineage This database contains point data representing 115 airports that the DOT considers OPEN-TO-THE-PUBLIC airport facilities in Georgia. The database is derived from the 1989, Georgia Airport Directory, a publication prepared and distributed by the DOT's, Bureau of Aeronautics. The coordinates, latitude and longitude were transferred by typing the data from the directory into the computer database. In addition, the name of the airport, the name of the city being serviced by the airport, and the page number from the Georgia Airport Directory which contains the data was also input into the computer database. Once the information was in a suitable format an Arc/Info database, Airprtpt (airport point), was developed. From Georgia Geologic Survey's digital databases library, using Arc/Info, a map was prepared showing the county outlines, the roadways and the airport point locations. It is from this Arc/Info map that the spatial relationships of the airport and roads were compared to and with the spatial relationships of the airport and its surrounding roads on the DOT County highway Maps (scale 1:63,360). Only one airport point was found to be misplaced and it was Lee Gilmer Memorial of Gainesville. An error was found in coordinates and is approximately 1 degree of Longitude. The as-published latitude and longitude for the Gainesville airport placed the airport near Rome Georgia. A corrected latitude and longitude for the Lee Gilmer Memorial airport was obtained from the center of the intersection of the two runway as depicted on the DOT General Highway Map of Hall County Georgia. 3.0 Spatial Data Organization Information This data consists of 115 data points representing the locations of the airports that the Georgia DOT listed as being open to the public in the state. 4.0 Spatial Reference Information The database has statewide coverage and is in an Albers Conic Equal Area projection. For more detail, see Part B: Section 4. 5.0 Entity and Attribute Information Each data point in the database has three attributes identifying the airport's name, what city in Georgia that the airport services, and on what page in the 1989 Georgia Airport Directory that the airport information can be found. 6.0 Distribution Information This database is maintained by the Georgia Geologic Survey as a Documentation Report 96-16 and is contained in digital files in Part C of this publication. 7.0 Metadata Reference Information The metadata which is incorporated within Part B of this publication, Documentation Report 96-16, meets the "Content Standards for Digital Geospatial Metadata" as defined by the Federal Geographic Data Committee on June 8, 1994. Appendix A: Signatures [Image] PART B TECHNICAL DESCRIPTION OF THE GIS DATABASE: AIRPORT RUNWAYS IN GEORGIA 1.0 Identification Information: 1.1 Citation: 1.1.8.1 Originator: Georgia Geologic Survey 1.1.8.2 Publication Date: 08/15/96 1.1.8.4 Title: PUBLIC AIRPORTS IN GEORGIA 1.1.8.5 Edition: Ver. 1.0 1.1.8.6 Geospatial Data: AIRPRTPT 1.1.8.7 Presentation Form: GIS Database 1.1.8.81 Publication Place: Atlanta, Georgia 1.1.8.82 Publisher: Georgia Geologic Survey 1.1.8.10 Online Linkage: Not Available 1.2 Description: 1.21 Abstract: This database contains point data representing 115 airports that the Georgia Department of Transportation (DOT) considers OPEN-TO-THE-PUBLIC airport facilities in Georgia. The database is derived from the 1989, Georgia Airport Directory, a publication prepared and distributed by the DOT, Bureau of Aeronautics. Private, military and/or emergency airfields are not listed in this database. 1.22 Purpose: The purpose of the database is to provide location data for inclusion on regional and state maps as well as for performing spatial analysis. This database was originally developed to generate an interim proximity database, buffered airports points. This interim buffered database is one of 13 databases used in the construction of a map and database which defines area that EPD considers to be geotechnically poorly suited for the construction and/or operation of a municipal solid waste landfill. 1.3 Time Period of Content: 1.3.1 Currentness Reference: 1989 1.4 Status: Complete 1.4.2 Update Frequency: Unknown 1.5 Spatial Domain: 1.5.1 Bounding Coordinates: 1.5.1.2 West Bounding Coordinate: -085 12 13.7 1.5.1.3 East Bounding Coordinate: -081 07 12.2 1.5.1.4 North Bounding Coordinate: 34 49 54.9 1.5.1.5 South Bounding Coordinate: 30 45 30 1.6 Keywords: 1.6.1 Theme: 1.6.1.1 Theme Keyword Reference: None 1.6.1.2 Theme Keyword: airports, airparks, air parks. 1.6.2 Place: 1.6.2.1 Place Keyword: Georgia, Ga., United States, USA 1.7 Access Constraints: None 1.8 Use Constraints: Not for use at scales greater than 1:100,000. The user must be sure to use the appropriate data set for the time period of interest. While efforts have been made to ensure that these data are accurate and reliable, GGS cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers. 1.9 Point of Contact: 1.9.10.1.1 Contact Person: Alan Giles 1.9.10.1.2 Contact Organization: Georgia Geologic Survey 1.9.10.1.3 Contact Position: Information Geologist 1.9.10.1.4 Contact Address: 1.9.10.1.4.2 Address: 19 Martin Luther King, Jr., Dr., SW 1.9.10.1.4.3 City: Atlanta 1.9.10.1.4.4 State or Province: Georgia 1.9. 10.1.4.5 Postal Code: 30334 1.9.10.1.4.6 Country: USA 1.9.10.1.5 Contact Voice Telephone: (404) 656-3214 1.9.10.1.7 Contact Facsimile Telephone: (404) 657-8379 1.9.10.1.8 Contact Electronic Mail Address: alan_giles@mail.dnr.state.ga.us 1.9.10.1.9 Hours of Service: 8:00AM TO 1:00PM and 2:00PM TO 4:30PM Eastern Time 1.13 Native Data Set Environment: Arc/Info version 7.0.3, Data General Unix 5.4.3 2.0 Data Quality Information: 2.1 Attribute Accuracy: 2.1.1 Attribute Accuracy Report: There are three (3) attributes within this database: NAME - the airport's name, ASSOC_CITY - the name of the city where the airport site provides service, AIRPRTPT-ID - the page number of the publication where airport information can be found. The attributes are accurately stated for each of the 115 sites. 2.2 Logical Consistency Report: The database for point locations of the airports were plotted onto a map on which the roadways from the Roads database were also plotted. The Roads database is one which has all the county, state, and federal roads and highways within its database, and is derived form the USGS 30 X 60 Minute series, 1:100,000 topographic maps of Georgia. It is this combination of the roadways and the airport points spatial relationship on the map that were compared with the roadways and the airport locations spatial relationship on the DOT County Highway Maps. Only one airport point was found to be mislocated and it was Lee Gilmer Memorial of Gainesville. The as-published latitude and longitude for the Gainesville airport placed the airport near Rome Georgia. The error was found to be approximately 1 degree of longitude. A corrected latitude and longitude for the Lee Gilmer Memorial airport was obtained from the center of the intersection of the two runway as depicted on the DOT General Highway Map of Hall County Georgia. The error to Lee Gilmer Memorial airport of Gainesville was corrected to lat. 34 degrees 16 minutes 24 seconds and long. 83 degrees 49 minutes 50 seconds, see section 2.5 for further explanation. 2.3 Completeness Report: The database contains all the open to the public airports that are in the state according to the Georgia DOT, Bureau of Aeronautics as of 1989. 2.4 Positional Accuracy: 2.4.1 Horizontal Positional Accuracy Report: Positional accuracy is unknown, but is estimated to be within +/- one half mile based on comparison with the County DOT General Highway Maps. 2.4.2 Vertical Positional Accuracy Report: None 2.5 Lineage: 2.5.1.1 Source Citation: 2.5.1.1.8.1 Originator: Georgia Department of Transportation, Bureau of Aeronautics 2.5.1.1.8.2 Publication date: 1989 2.5.1.1.8.4 Title: Georgia Airport Directory 2.5.1.1.8.5 Edition: 2.51.1.8.6 Geospatial Data: Presentation Form: Text 2.5.1.1.8.8.1 Publication Place: Atlanta, GA. 2.5.1.1.8.8.2 Publisher: Georgia Department of Transportation, Bureau of Aeronautics 2.5.1.1.8.10 Online Linkage: None 2.5.1.2 Source Scale Denominator: 100,000 2.5.1.3 Type of Source Media: Text 2.5.1.5 Source Citation Abbreviation: DOT 2.5.1.6 Source Contribution 1. Originator of the information contained in the publication Georgia Airport Directory. 2.5.1 Source Information: 2.5.1.1 Source Citation: See section 1.1 Citation Georgia Geologic Survey 2.5.11.2 Source Scale Denominator: 1:100,000 2.5.1.3 Type of Source Media: Machine-readable files 2.5.1.5 Source Citation Abbreviation: GGS 2.5.1.6 Source Contribution The database is derived from the 1989, Georgia Airport Directory, a publication prepared and distributed by the Georgia DOT, Bureau of Aeronautics. The coordinates, latitude and longitude were transferred by typing the data from the directory into a computer database. In addition, the name of the airport, the name of the city being serviced by the airport, and the page number from the Georgia Airport Directory that contains the data was also input into the computer database. Once the information was in a suitable format an Arc/Info database, Airprtpt (airport point), was developed. From GGS's digital databases library, using Arc/Info, a map was prepared showing the county outlines, the roads and the airport point locations. With this Arc/Info map the spatial relationships of the airports and roads were compared to and with the spatial relationships of the airports and roads on the DOT County highway Maps (scale 1:63,360). Only one airport point was found to be mislocated and it was Lee Gilmer Memorial of Gainesville. The as-published latitude and longitude for the Gainesville airport placed the airport near Rome Georgia. The mislocated airport was corrected to lat. 34 degrees 16 minutes 24 seconds and long. 83 degrees 49 minutes 50 seconds. The new latitude and longitude for the Lee Gilmer Memorial airport was obtain from the center of the intersection of the two runway as depicted on the DOT County highway Maps for Hall county. 3.0 Spatial Data Organization Information: 3.1 Indirect Spatial Reference Method: Degrees Minutes Seconds 3.2 Direct Spatial Reference Method: Entity point 3.3 Point and Vector Object Information: 3.3.1 SDTS Terms Description: 3.3.1.1 Object Type: point 3.3.1.2 Object Count: 115 3.3.1.1 Object Type: Universe Polygon 3.3.1.2 Object Count: 1 4.0 Spatial Reference Information: 4.1 Horizontal Coordinate System Definition: 4.1.2 Planar: 4.1.2.1 Map Projection: 4.1.2.1.2 Map Projection Name: Albers Conic Equal Area 4.1.2.1.2.1.a Standard Parallel: 29 30 0.000 4.1.2.1.2.1.b Standard Parallel: 45 30 0.000 4.1.2.1.2.2 Longitude of Central Meridian: -83 30 0.000 4.1.2.1.2.3 Latitude of Projection Origin: 23 00 0.000 4.1.2.1.2.4 False Easting: 0.000 4.1.2.1.2.5 False Northing: 0.000 4.1.2.4 Planar Coordinate Information: 4.1.2.4.1 Planar Coordinate Encoding Method: Coordinate pair 4.1.2.4.2 Coordinate Representation 4.1.2.4.2.1 Abscissa Resolution 0.1 4.1.2.4.2.2 Ordinate Resolution 1.0 4.1.2.4.4 Planar Distance Units: Meters 4.1.4. Geodetic Model: 4.1.4.1 Horizontal Datum Name: North American Datum of 1983 4.1.4.2 Ellipsoid Name: GRS 80 4.1.4.3 Semi-major Axis: 6378206.4 4.1.4.4 Denominator of Flattening Ratio: 294.9786982 4.2 Vertical Coordinate System Definition: None 5.0 Entity and Attribute Information: 5.1 Detailed Description 5.1.1 Entity Type 5.1.1.1 Entity Type Label: AIRPRTPT.PAT 5.1.1.2 Entity Type Definition: Point attribute table 5.1.2 Attribute 5.1.2.1 Attribute Label: NAME: 5.1.2.2 Attribute Definition: Name of the airport facility. 5.1.2.4 Attribute Domain Values: Character 5.1.2 Attribute 5.1.2.1 Attribute Label: ASSOC_CITY: 5.1.2.2 Attribute Definition: City served by the airport. 5.1.2.4 Attribute Domain Values: Character 5.1.2 Attribute 5.1.2.1 Attribute Label: AIRPRTPT-ID: 5.1.2.2 Attribute Definition: Page number from source reference 5.1.2.4 Attribute Domain Values: Character 6.0 Distribution Information: 6.1 Distributor: See Point of Contact, Section 1.9. 6.2 Resource Description: None. 6.3 Distribution Liability: Users must assume responsibility to determine the usability of this data for their purposes. 6.4 Standard Ordering Process: Contact the Georgia Geologic Survey, see 1.9. 6.5 Custom Order Process: Contact the Georgia Geologic Survey, See 1.9. 7.0 Metadata Reference Information: 7.1 Metadata Date: 04/26/95 by David Hipple 7.2 Metadata Review Date: 04/30/96, by Victoria Trent, CSAT 7.2 Metadata Review Date: 08/02/96, by Roger Carter, GGS 7.2 Metadata Review Date: 08/02/96, by William McLemore, GGS 7.4 Metadata Contact: 7.4.10.1.1 Contact Person: David Hipple 7.4.10.1.2 Contact Organization: Georgia Geologic Survey 7.4.10.3 Contact Position: GIS- Senior Geologist 7.4.10.4 Contact Address: 7.4.10.4.2 Address: 19 Martin Luther King, Jr., Dr., SW 7.4.10.4.3 City: Atlanta 7.4.10.4.4 State or Province: Georgia 7.4.10.4.5 Postal Code: 30334 7.4.10.4.6 Country: USA 7.4.10.5 Contact Voice Telephone: (404) 894-0128 7.4.10.5 Contact Facsimile Telephone: (404) 894-6199 7.4.10.7 Contact Electronic Mail Address: drhipple@mail.dnr.state.ga.us 7.4.10.9 Hours of Service: 8-4:30, Eastern Time 7.5 Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata 7.6 Metadata Standard Version: 6/8/94 PART C THE DIGITAL FILES CONTAINING THE GIS DATABASE: PUBLIC AIRPORT IN GEORGIA Summary of Contents of Data Diskettes: Part C. The digital files are written on the enclosed One (1) 1.44 megabyte High Density Diskettes. The disk is in DOS format and contains the following: 1. README.TXT - an ASCII file which is a digital copy of this summary. 2. AIRPRTPT.TXT - a digital copy of this publication in ASCII format. 3. AIRPRTPT.WPD - a digital copy of the text in this publication, but in WordPerfect 6.0 format. 4. AIRPRTPT.E00 - the GIS database in ARC/INFO Export format. Just place the file into the directory where you would like have the export file. 5. File Size: a. AIRPRTPT.E00 49 KB b. AIRPRTPT.WPD 191 KB c. AIRPRTPT.TXT 29 KB d. README.TXT 2 KB