The ARC/INFO Railroad data set was extracted from the 100,000-scale map USGS
Digital Line Graphs Level-3 Compact Disk-Read Only Memory (CD-ROM).
Citation_Information:
Originator: Scientific Assessment and Strategy Team (SAST)
Publication_Date: 19950501
Title: RAIL ARC/INFO COVERAGE
Geospatial_Data_Presentation_Form: map
Online_Linkage: http://edcwww.cr.usgs.gov/sast-home.html
Description:
The SAST ARC/INFO database is a comprehensive vector basemap of the Upper
Mississippi/Missouri River Basin and contains attribute data suitable for
performing a wide range of analyses and for generating thematic maps for
counties and states throughout the flood area.
Abstract:
On January 10, 1994, the Scientific Assessment and Strategy Team (SAST)
joined in the effort to provide scientific advice and assistance to
officials responsible for making decisions with respect to the flood
recovery in the Upper Mississippi River Basin.
The 100K Digital Line Graph (DLG) data files were provided to the SAST
by the Earth Science Information Center (ESIC) of the U.S. Geological
Survey on a Compact Disk-Read Only Memory (CD-ROM). These data files
include information from the USGS planimetric map base categories such as
transportation, hydrography, and public land survey boundaries. The DLG
format was used to transport data to the Geographic Information System
(GIS), ARC/INFO data model.
Purpose:
The SAST converted the DLG data sets to the ARC/INFO GIS for several
reasons. ARC/INFO organizes geographic data using a relational and
topological model. This facilitates efficient handling of the two generic
classes of spatial data: Locational data describing the location and
topology of point, line, and area features; and attribute data describing
the characteristics of these features.
Spatial_Domain:
Bounding_Coordinates: Geographic coordinates (latitude/longitude) in
decimal degrees.
West_Bounding_Coordinate: 36.0 -111.0
East_Bounding_Coordinate: 36.5 -86.5
South_Bounding_Coordinate: 48.5 -84.0
North_Bounding_Coordinate: 49.5 -114.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: None.
Theme_Keyword: digital line graph
Theme_Keyword: DLG
Theme_Keyword: Railroads
Theme_Keyword: line
Theme_Keyword: rail
Theme_Keyword: Coverage
Theme_Keyword: ARC/INFO
Theme_Keyword: Fuzzy Tolerance
Theme_Keyword: Arc
Theme_Keyword: Major
Theme_Keyword: Minor
Theme_Keyword: attribute
Theme_Keyword: ARCPLOT
Theme_Keyword: Topology
Place:
Place_Keyword_Thesaurus: None
U.S. Department of Commerce, 1987, Codes for the identification of
the States, the District of Columbia and the outlying areas of The
United States, and associated areas (Federal Information Processing
Standard 5-2):Washington ,D. C., National Institute of Standards and
Technology.
Place_Keyword: US
Place_Keyword: Upper Mississippi/Missouri river basin
Access_Constraints: None
Use_Constraints: None
Acknowledgement of the U.S. Geological Survey and the Scientific
Assessment and Strategy Team would be appreciated in products derived
from these data.
Contact_Information:
Point_of_Contact: Jacqueline Klaver
Contact_Position: Senior Scientist
Contact_Address:
Address_Type:
Address: SAST
U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 605 594 6961
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: jklaver@edcserver1.cr.usgs.gov
Hours_of_Service: 0730-1615
Data_Set_Credit:
Scientific Assessment and Strategy Team
U.S. Geological Survey
Native_Data_Set_Environment:
UNIX ARC/INFO
Cross_Reference:
Upper Mississippi/Missouri River Basin ARC/INFO coverages in the Scientific
Assessment and Strategy Team (SAST) database.
During ARC/INFO coverage development several modifications were made to the
source data in order to generate a database with a common scale, uniform level
of resolution, consistent coding scheme, and comparable (standardized)
measurement data.
Attribute_Accuracy:
Attribute accuracy is estimated to be 98.5 percent. A check for illogical
attribute combinations were performed both interactively and via batch
procedures.
Attribute_Accuracy_Report:
Visual tests involved the review of check plots. The check plots were
matched against the source map book for the 1:100,000-scale Digital Line
Graph (DLG) data to verify the validity of particular codes.
Attribute_Accuracy_Value:
The accuracy of most attributes has not been explicitly tested against
independent sources. However, all the data derived from the DLGs have
and in hard copy.
Attribute_Accuracy_Explanation:
Code attributes were reviewed by checking for invalid codes in the
database using the ARC/INFO CODEFIND command. Invalid code combinations
were checked using the ARC/INFO CONSIST command (codes were deemed
invalid if they were undefined in the Digital Line Graphs from 100K-scale
Maps, Data Users Guide 2.
CODEFIND identifies coding errors for item values in an INFO data
file.
CONSIST identifies illogical code combinations for multiple items
in an INFO data file. Item values are compared against a
series of user-specified conditions to identify illogical
code combinations.
Logical_Consistency_Report:
All data were found to be topologically correct. No duplicate features are
present. All lines intersect where intended. No undershoots or overshoots
are present.
The tests of logical consistency were performed by the ARC commands:
BUILD creates or updates a feature attribute table for a
coverage. It defines arc-node topology when the LINE
option is used.
CLEAN generates a coverage with correct arc-node topology.
It edits and corrects geometric coordinate errors, and
creates feature attribute information for each arc (i.e.,
creates a AAT).
CLIP creates a new coverage by overlaying two sets of
features, which are the arcs.
DISSOLVE eliminates arcs between adjacent polygons containing
equal values.
LABELERRORS lists all polygons which have either no label points
or more than one label point.
Completeness_Report:
Data completeness reflects the content of the source Digital Line Graph.
Features may have been eliminated or generalized on the source graphic, due
to scale and legibility constraints.
Positional_Accuracy:
The positional accuracy of the SAST Arc/INFO database is consistent with the
original DLG data which has met the criteria for inclusion in the National
Digital Cartographic Database.
Horizontal_Positional_Accuracy_Report:
The accuracy of the database components that originated in the USGS DLGs
can be inferred to have the cumulative effects of data processing performed
by the Scientific Assessment and Strategy Team (SAST).
Horizontal_Positional_Accuracy_Value:
The conservative estimate on the accuracy of the ARC/INFO 1:100,000-scale
data derived from the 1:100,000-scale DLG data is 0.02 inches.
Horizontal_Positional_Accuracy_Explanation: Horizontal positional
accuracy is based upon the use of USGS source Digital Line Graphs from
100,000-scale maps. The ARC Tolerance command is used to set and
examine the tolerances associated with a DLG data set. Positional
accuracy between the DLG data set and ARC data files are within a 0.02
inches tolerance. Features with like dimensionality, and with or
without like attribution, that are within the tolerance are adjusted by
moving the feature equally in both the data set and coverage. Features
outside the tolerance are not moved.
Lineage:
Data derived primarily from the 1:100,000-scale DLG database.
Source_Information:
The ARC/INFO data was derived primarily from 1:100,000-scale USGS DLG and
converted into double-precision coverages, using the DLGARC command in
ARC/INFO Rev.6.1.
Source_Citation:
Digital Line Graphs from 1:100,000-Scale Maps, Data Users Guide 2
Type_of_Source_Media: CD-ROM
SAST Upper Mississippi/Missouri River Basin database ARC/INFO coverages.
Source_Scale_Denominator: 100,000
Type_of_Source_Media: CD-ROM
Process_Step:
The SAST received a Compact Disk-Read Only Memory (CD-ROM) from the U.S.
Geological Survey containing the 100K Digital Line Graph level-3 (DLG-3)
that contained the line data for the railroad layer.
Process_Description:
The DLG Railroad layer was downloaded to the UNIX system and converted
to an ARC/INFO coverage using the ARC command DLGARC. DLGARC created
the file .ACODE which contains arc attribute codes for each
line (L) record.
The differences in topological representation between DLG and ARC/INFO
data does not allow DLGARC to convert the DLG topology. Therefore, the
ARC commands BUILD and CLEAN were used to recreate coverage topology.
BUILD creates or updates a feature attribute table for a line
coverage (.AAT). It defines arc-node topology.
CLEAN generates a coverage with correct arc-node topology.
It edits and corrects geometric coordinate errors,
and creates feature attribute information for each arc
(i.e., creates an AAT).
Once the feature attribute table for the coverage was built, the User-ID
(i.e., coverage-ID) in the feature attribute table was related to the
coverage-ID item in the .CODE file. The .CODE file was used to
associate major and minor code pairs with the coverage's features.
Prior to creating each ARC coverage the SAST established the map
projection and coordinate system as used to record x,y locations and
coordinates for their geographic data base. The DLG data is delivered
in the UTM projection, but the coverages were more applicable in the
Albers coordinate system(i.e., map projection).
The map projection of each DLG coverage is in a map projection file
created by DLGARC. This projection (.PRJ) file defined the UTM
projection of the DLG file. The output projection, Albers, was defined
in the .PRJ file using the PROJECT command in ARC.
The DLG files are always single precision. In ARC the coordinate
precision is determined by the current processing rule as set by the
PRECISION command. The ARC/INFO coverage RAIL used the processing rule
DOUBLE.
DLG attributes are recorded in major and minor code pairs and are defined
as integer codes in the attribute table. The SAST provided a more
meaningful description for each attribute code by defining ITEMS in the
INFO file which placed all MAJOR codes into one item and all MINOR codes
into individual items having more descriptive names. The following ITEMS
were incorporated into the .AAT table by the ARC commands:
ADDITEM was used to create a new INFO file that was like the
original except that it contained a new, empty item.
ADDITEM to was used to add the item ID-NUM with INFO
definition 7,7,I to the attribute file. ADDITEM was
also used to create matching items among two (or more)
INFO files in order to perform an INFO relate. The
RR-CODE is an additem which defines the contiguous
major and minor code-pairs into a group.
PULLITEMS The new INFO subset of items were specified to replace
the .ACODE INFO major/minor code-pairs and to copy the
new item ID-NUM.
JOINITEM Used to merge the two INFO files based on a shared item.
The relate item RAIL-ID was used as an index to the
records in the . The option ORDERED sorted
the on the relate item. Both these files
must contain the .
IDEDIT update the User-IDs in the coverage's coordinate files.
In IDEDIT, the feature attribute table is used to
determine the correct User-ID for each feature in the
coverage. This value is recorded in all places where
the feature User-ID is stored.
The INFO commands to modify the results further are as followed:
SELECT The SELECT established the data file that was needed for
for processing. In this process the coverage's new .AAT
was SELECTED.
CALCULATE A numeric value is computed and assigned to the numeric
data file items. That is, the ID-NUM was calculated to
equal the cover-id and all major/minor code-pairs less
than and equal to 0 were calculated to equal 0.
REDEFINE starts a dialog through which items were redefined in
the selected data file (.AAT). In the RAIL.AAT the
item ID-NUM was redefined. The redefined item MCODES
holds the entire list of major/minor-code pairs as a
single character item.
Source_Used_Citation_Abbreviation:
The 100K DLG CD-ROM Transportation category Railroad sub-category.
Process_Date:
In 1994 the 100K DLG RAILROAD layer was converted to an ARC/INFO RAIL
coverage.
Process_Contact:
Contact_Information:
Point_of_Contact: Jacqueline Klaver
Contact_Position: Senior Scientist
Contact_Address:
Address_Type:
Address: SAST
U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 605 594 6961
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: jklaver@edcserver1.cr.usgs.gov
The Upper Mississippi/Missouri river basin represented in the ARC/INFO coverage
1:100,000 RAIL.
Indirect_Spatial_Reference:
Digital line data represented by arcs in ARC/INFO that depict the railroads of
1:100,000 topographic data and attributes or codes as naming and pointers for
referencing.
Direct_Spatial_Reference_Method:
Point and Vector
Point/Vector_Object_Information:
Number of Points: 0
Number of lines: 3602
Number of line segments: 9626
Number of Polygons: 0
Point_Object_Information:
Number of control points: 32
SDTS_Terms_Description:
A line is a generic term for a one-dimensional object.
The attributes (or items) in the ARC/INFO feature attribute tables contain
different types of values; specifically, measurements, codes, flags, and names.
Detailed_Description:
Entity_Type: An ARC/INFO line coverage
Entity_Type_Label: RAIL.AAT
Entity_Type_Definition: Arc attribute table
Entity_Type_Definition_Source: ARC/INFO-generated and user defined
attributes and items.
Col ITEM NAME WDTH OPUT TYP N. DEC
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 8 18 F -
25 RAIL# 4 5 B -
29 RAIL-ID 4 5 B -
33 ID-NUM 7 7 I -
40 Major1 6 6 I -
46 Minor1 6 6 I -
52 Major2 6 6 I -
58 Minor2 6 6 I -
64 Major3 6 6 I -
70 Minor3 6 6 I -
76 Major4 6 6 I -
82 Minor4 6 6 I -
88 RR-CODE 3 3 I -
** REDEFINED ITEMS
33 FILE-NUM 3 3 I -
40 MCODES 48 48 C -
Attribute:
Attribute_Label: FNODE#
Attribute_Definition: the internal number of the from node (beginning
point of the arc)
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive integer
Attribute_Label: TNODE#
Attribute_Definition: the internal number of the to-node (ending point
of the arc)
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive integer
Attribute_Label: LPOLY#
Attribute_Definition: the internal number of the polygon (if any)
on the arc's left side
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive integer
Attribute_Label: RPOLY#
Attribute_Definition: the internal number of the polygon (if any)
on the arc's right side
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive integer
Attribute_Label: LENGTH
Attribute_Definition: the length of the arc
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Positive real numbers
Attribute_Label: RAIL#
Attribute_Definition: each features unique identifier
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive integer
Attribute_Label: RAIL-ID
Attribute_Definition: user-assigned feature number
Attribute_Definition_Source: user-defined
Attribute_Domain_Values: integer
Attribute_Label: ID-NUM
Attribute_Definition: seven digit arc User-ID
Attribute_Definition_Source: Computed
Attribute_Domain_Values: integer
Attribute_Label: Major1
Attribute_Definition: six digit code-identifying the Major category
to which the element attaches
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: Minor1
Attribute_Definition: six digit code-specifically describes element
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: Major2
Attribute_Definition: six digit code-identifying the Major category
to which the element attaches
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: Minor2
Attribute_Definition: six digit code-specifically describes element
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: Major3
Attribute_Definition: six digit code-identifying the Major category
to which the element attaches
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: Minor3
Attribute_Definition: six digit code-specifically describes element
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: Major4
Attribute_Definition: six digit code-identifying the Major category
to which the element attaches
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: Minor4
Attribute_Definition: six digit code-specifically describes element
Attribute_Definition_Source: Standards for Digital Line Graphs, Part 3
Attribute_Domain_Values: integer
Attribute_Label: RR-CODE
Attribute_Definition: three digit redefined Major/Minor code grouping
Attribute_Definition_Source: ARC/INFO database definition
Attribute_Domain_Values: integer
Attribute_Label: FILE-NUM
Attribute_Definition: three digit redefined ID-NUM
Attribute_Definition_Source: ARC/INFO database definition
Attribute_Domain_Values: integer
Attribute_Label: MCODES
Attribute_Definition: entire list of major/minor_code pairs as a
single character
Attribute_Definition_Source: ARC/INFO redefined item
Attribute_Domain_Values: Character
Codeset_Domain:
Codeset_Name: Code attributes
Codeset_Source: DLG attribute codes database and SAST ARC/INFO
database.
RR-CODE MAJOR/MINOR General Description
2 201 Railroad
13 all other Ferry, streetcar, etc.
Attribute_Value_Accuracy_Information:
The accuracy of most attributes in the ARC/INFO 1:100,000-scale database
are as accurate as the 1:100,000-scale Digital Line Graph Transportation
line Railroad layer.
Overview_Description:
Entity_and_Attribute_Detail_Citation:
The Scientific Assessment Strategy Team (SAST), U.S. Geological
Survey, EROS Data Center, Sioux Falls, SD. RAILROAD Documentation.
U.S.Department of the Interior, U.S. Geological Survey, 1987 Digital
Line Graphs from 1:100,000-Scale Maps--Data Users Guide 2; Reston,
Virginia.
U.S.Department of the Interior, U.S.Geological Survey, 1990, Standards
for Digital Line Graphs, Part 3: Attribute Codes: Reston, VA.
Distributor: SAST
Contact_Information:
Contact_Person: Jacqueline Klaver
Contact_Position: Senior Scientist
Contact_Address:
Address_Type:
Address: SAST
U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 605 594 6961
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: jklaver@edcserver1.cr.usgs.gov
Hours_of_Service: 0730-1615
Resource_Description:
Scientific Assessment and Strategy Team (SAST) Upper Mississippi River
Basin ARC/INFO USGS 1:100,000-scale Rail
Distribution_Liability:
Although these data have been processed successfully on a computer
system at the EROS Data Center, no warranty expressed or implied is made
by the SAST or USGS regarding the utility of the data on any other
system, nor shall the act of distribution constitute any such warranty.
The Geological Survey will warrant the delivery of this product in
computer-readable format, and will offer appropriate adjustment of
credit when the product is determined unreadable by correctly adjusted
computer input peripherals, or when the physical medium is delivered in
damaged condition. Requests for adjustment of credit must be made
within 90 days from the date of this shipment from the ordering site.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE (ARC Export)
Format_Version_Number: ARC6.1
Format_Version_Date:
Format_Specification: Arc coverage data set or layer
Format_Information_Content: 1:100,000-scale Rail Transportation
File_Decompression_Technique: ARC6.1 import (compressed)
Transfer_Size:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
ftp edcftp.cr.usgs.gov
Enter "anonymous" at name prompt
Enter complete e-mail address at the Password prompt
cd (change) pub/data/sast (subdirectory)
Type: binary (set the file transfer mode to binary)
Type: get (to download one file) or
Type: mget (to download more than one file)
Digital_Transfer_Information:
Format_Name: PC ARC (Export)
Format_Version_Number: ARC6.1
Format_Version_Date:
Format_Specification: Arc coverage data set or layer
Format_Information_Content: 1:100,000-scale Rail Transportation
File_Decompression_Technique: ARC6.1 import (uncompressed)
Transfer_Size:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
ftp edcftp.cr.usgs.gov
Enter "anonymous" at name prompt
Enter complete e-mail address at the Password prompt
cd (change) pub/data/sast (subdirectory)
Type: binary (set the file transfer mode to binary)
Type: get (to download one file) or
Type: mget (to download more than one file)
Digital_Transfer_Information:
Format_Name: SDTS
Format_Version_Number:
Format_Version_Date:
Format_Specification: Line coverage data set or layer
Format_Information_Content: 1:100,000-scale Rail Transportation
File_Decompression_Technique:
Transfer_Size:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
ftp edcftp.cr.usgs.gov
Enter "anonymous" at name prompt
Enter complete e-mail address at the Password prompt
cd (change) pub/data/sast (subdirectory)
Type: binary (set the file transfer mode to binary)
Type: get (to download one file) or
Type: mget (to download more than one file)
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Compatibility_Information:
This CD-ROM can be used with all computer operating systems that
support CD-ROM as a logical storage device. All text files on
the disc are in ASCII format. Data files are in ASCII or binary
format.
Fees:
CD-ROM = $70
Ordering_Instructions:
Point_of Contact: Ron Risty
Contact_Position: Senior Information Scientist
Contact_Address:
Address_Type:
Address: U.S. Geological Survey
EROS Data Center
City: Sioux Falls
State: SD
Country: USA
Contact_Voice_Telephone: 605 594 6969
Contact_Facsimile_Telephone: 605 594 6589
Contact_Electronic_Mail: risty@edcserver1.cr.usgs.gov
Hours_of_ Service: 7:30am - 4:15pm
Turnaround:
One week maximum
Metadata_Date: 19961023
Metadata_Contact_Information:
Metadata_Contact_Person: Mary C. Weinheimer
Metadata_Contact_Position: Information Scientist
Contact_Address:
Address_Type: mailing address
Address: U. S. Geological Survey
EROS Data Center
City: Sioux Falls
State_or_Province: South Dakota
Postal_Code: 57198
Country: USA
Contact_Voice_Telephone: 1 605 594 6097
Contact_Facsimile_Telephone: 605 594 6589
Contact_Internet_Address: weinheim@edcserver1.cr.usgs.gov
Hours_of_Service: 0730-1615
Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 1.0
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