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Layer: Fig. 6.1 Intersection Types (ID:1)

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Name: Fig. 6.1 Intersection Types

Display Field: INT_freedom__Intersection_Name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Basic Description: The polygon feature class Fig. 6.1 Intersection Types (filename- PBMP_INTT_City_Poly_001) represents the 9 known types of street intersections at Pompeii as published in figure 6.1 of Poehler, Eric E. 2017. The Traffic Systems of Pompeii (New York: Oxford University Press). Data History: The attribute data for these features were derived from figure 6.1 and table 6.1 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press). Intersection types include: Bend; Offset; Double Offset; Offset T; Wide Offset; Orthogonal; “T”; Unique; “Y”. Definitions of these types are as follows: Bend: A Bend Type intersection is the conjunction of two streets to form a roughly right angle turn. Offset: An Offset Type intersection is represented by two streets that meet at a cross street and share the same orientation, but have a shifted alignment in relation to one another. An intersection is considered to be of Offset Type if the insulae walls across the intersection alter the alignment of the approaching street. Sidewalks narrowing a street do not constitute an Offset. Offsets Types are further defined by four sub-types: 1. The northern street is east of the southern street. 2. The northern street is west of the southern street. 3. The western street is north of the eastern street. 4. The western street is south of the eastern street. Double Offset: An intersection is determined to be a Double Offset when all four streets approaching an intersection do not share an alignment though two pairs may have similar orientations. Offset “T”: An Offset “T” Type intersection is a standard “T” Type intersection where the segments of the crossing street are not in alignment with one another. Wide Offset: An intersection is said to be of Wide Offset Type when two streets meeting a cross street form a continuation of each other, but do not lead directly into on another. In this definition, the distance between these streets on the cross street is no more than ten meters. If the distance is greater than ten meters, the intersections are treated as two separate “T” Type intersections. Orthogonal: The Orthogonal Type is defined as the intersection of two streets crossing at right angles to one another and where the streets opposite from one another share both orientation and alignment. “T”: A “T” Type intersection is formed by one street meeting a cross street, at a roughly perpendicular angle, without having a continuation across that intersection. “Y”: A “Y” Type intersection is formed by the confluence of three streets where the angle between the two converging/splitting streets is significantly lower than ninety-degrees. These attribute data were produced by in-field observation and documentation supplemented by CAD measurements by the author between 2007 and 2016. After joining the information on intersection type to the Intersections (INT) layer, the intersections were given a ten meter buffer to improve visibility of the attribute data. Spatial data in this layer are based on a CAD file provided by the Soprintendenza di Pompei to Eric Poehler in 2003. The CAD file was created by digitizing the RICA Maps of Pompeii, 1984, supported by World Monuments Watch and funded by American Express. The RICA MAPs were drawn in part from aerial images taken at 820m and supplemented by on the ground survey. Inconsistencies among the features of this layer with satellite imagery or other maps of Pompeii may be the result of errors in the rectification of the original aerial images and differences projected between coordinate systems (PBMP data are in the Monte_Mario_Italy_2 projected coordinate system). On the creation of the RICA Maps, see Van der Poel, H. B., Corpus Topographicum Pompeianum, vol. IIIA. Austin, TX, 1986, XI-XIX. Symbologies: This feature class is symbolized (multiple), with no display transparency, and scale visibility set to not above 1:40,000. Credits: These data were produced by Eric Poehler for the Pompeii Bibliography and Mapping Project after original CAD data provided by the Soprintendenza di Pompei.

Copyright Text:

Min. Scale: 40000

Max. Scale: 0

Default Visibility: false

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID_1

Unique ID Field:

Global ID Field:

Type ID Field: INT_freedom__Intersection_Type

Fields:
Types:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 12/12/2017 12:14:30 PM

Schema Last Edit Date: 12/12/2017 12:14:30 PM

Data Last Edit Date: 12/12/2017 12:14:30 PM

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