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State System Roads
The following is a description of the State on-system street network: General Information DATA LAYER NAME: DIST1LRS, DIST2LRS, DIST4LRS, DIST7LRS DESCRIPTION: State System Roadways TYPE: ArcINFO Line Coverage SCALE: DATUM: NAD 83 PROJECTION: UTM Zone 17 MAP UNITS: Meters AGENCY DATA NAME: lrs ADDITIONAL INFORMATION: This data was Imported to ArcINFO V 7.03 and projected to a standard format - UTM Zone 17, NAD 83. EXPLANATION OF PROCEDURES USED TO TRANSFORM THE DATA (verbal description, algorithms, projection, commands, etc., as needed) Locations of state routes were identified on paper quad sheets and labeled with their Roadway Characteristics Inventory roadway id and direction. Each roadway was digitized using Intergraph software from USGS mylar quad sheets using the UTM 17 NAD27 coordinates for the quad corners to register the digitizer. The Intergraph DGN file was imported to GDS where it is currently maintained. Maintenance includes additions, modifications, and deletions of roads and intersections (nodes). The LRS coverage is maintained in UTM 17 projection NAD 27 datum at this time. A list of roadways and the coordinates of their vertices was generated into an ARC/INFO coverage. Route attributions were added to the coverage to take advantage of dynamic segmentation. An ARC/INFO export file is the current distribution format. ATTRIBUTE DESCRIPTION : The LRS coverage has attribution in several INFO files which can be related to Roadway Characteristics Inventory (RCI) data with the 'roadway' item. ARC/INFO dynamic segmentation includes a 'section' file and a 'route' file in addition to the usual INFO files associated with an arc coverage. The arc file item 'lrs#' links to the section file item 'arclink#' in a one-to-many relate. The section file item 'routelink#' links to the route file item 'road#' in a many-to-one relate. RCI data may be accessed for each arc or route with the 'roadway' item. In the case of overlapping routes, the primary route, by which RCI data is referenced for sections with multiple routes, is the route identified by the arc file 'roadway' item, not the route file 'roadway' item. A route is broken into sections identified by the 'roadway,' with a 'begin_post' and a 'end_post' measured in miles. The first two characters of the eight character 'roadway' item indicate the county of the roadway using FDOT's county numbering system. The next three characters indicate the roadway section (not to be confused with ARC/INFO's 'section' file type). The last three characters indicate the roadway sub-section. The Roadway Characteristics Inventory contains many tables dealing with RCI road classifications, conditions, monitoring, etc. The exported INFO tables containing RCI data is about two times as large as the exported LRS coverage. For more information, contact the FDOT Transportation Statistics Office. These are the arc attribute items: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 FNODE# 4 5 B - - 5 TNODE# 4 5 B - - 9 LPOLY# 4 5 B - - 13 RPOLY# 4 5 B - - 17 LENGTH 4 12 F 3 - 21 LRS# 4 5 B - - 25 LRS-ID 4 5 B - - 29 ROADWAY 8 8 C - - 37 COUNTY 3 3 C - - ** REDEFINED ITEMS ** 29 CO_NUM 2 2 C - - These are the 'road' section attribute items: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 ROUTELINK# 4 5 B - - 5 ARCLINK# 4 5 B - - 9 F-MEAS 4 12 F 3 - 13 T-MEAS 4 12 F 3 - 17 F-POS 4 12 F 3 - 21 T-POS 4 12 F 3 - 25 ROAD# 4 5 B - - 29 ROAD-ID 4 5 B - - 33 NEW-F-MEAS 4 12 F 3 - 37 NEW-T-MEAS 4 12 F 3 - 41 ADJUST 1 1 C - - These are the 'road' route attribute items: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 ROAD# 4 5 B - - 5 ROAD-ID 4 5 B - - 9 ROADWAY 8 8 C - - 17 BEGIN_POST 4 12 F 3 - 21 END_POST 4 12 F 3 - LIMITATIONS OF THE DATA / WARNINGS TO THE USER : Note that digitizing from 1:24,000 quad sheets results in accuracies much less than 1:24,000. Also note that there is a lag time between completion of highway projects and update of RCI and the LRS coverage. |
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