Description: Basic Description: The polygon feature class Fig. 3.1 Street Surfaces (filename- PBMP_PVT_City_Poly_001) represents the 6 known (and 1 unknown) types of paving at Pompeii as published in figure 3.1 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 3.1 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press). Surface types include: Battuto; Debris; Paved; Sarno Paving; Under Repair; Unpaved; Unknown. These data were produced by in-field observation and documentation supplemented by secondary source research by the author between 1998 and 2016. After joining the information on surface types to the Streets (STR) layer, the streets were given a three meter buffer to improve visibility of the attribute data, and then all streets were merged into a single feature by surface type.
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.
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.
Description: Basic Description: The polygon feature class Fig. 6.3 Evidence for Right-Side Driving (filename- PBMP_RSDD_City_Poly_001 ) represents the percentage of certainty values from directional evidence that demonstrates driving on the right side of two-way streets at Pompeii as published in figure 6.3 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 6.3 and table 6.4 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Calculations of the evidence from curbstones and guard stones (stepping-stones were considered separately) were made as follows: “For each street, the number of directional wearing patterns and the certainty of each pattern was associated with a side of the street and then considered against the direction interpreted to determine which side of the street drivers were using. For example, on via di Nola, sixteen total wearing patterns were found, thirteen of which show vehicles moving either westbound along the north curb or eastbound along the south curb. These had a total certainty value of 40, which compares with a certainty value of 5 for the three wearing patterns found to suggest driving on the left-hand side of the road. The difference between these two certainty values is also expressed in table 6.4 as a percentage of the whole, in this case revealing that 88.9% of all the traffic on via di Nola moved along the right curb, while only 11.1% can be shown to have regularly impacted the left curb” (p. 150).
After joining the information on surface types to the Streets (STR) layer, the streets were given a three 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 as quantities (graduated colors) in five manually derived classes, 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.
Name: Fig. 6.8 Directions - Detours Period (Post 62 CE)
Display Field: Name
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Basic Description: The polygon feature class Fig. 6.8 Directions - Detours Period (Post 62 CE) (filename- PBMP_DIR_City_Poly_001) represents the direction of one-way streets at Pompeii between 62 and 79 CE as published in figure 6.8 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 6.8 and tables 6.5-6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Calculations of the evidence from all street features were made as follows: “The total number of wearing patterns attested for each direction as well as the total clarity (certainty) of those interpretations is given in the first two columns of each direction [in tables 6.5 and 6.6]. Following these is the percentage of all certainty values on a street that a direction represents. For example, the total certainty value for the westbound direction of traffic on vicolo di Mercurio is 92, which is combined with the certainty values for eastbound traffic (57) to make up 61.7% of all the directional evidence on that street. For each direction the average certainty of the interpretations on that street is given as a way to assess the overall strength of the evidence supporting a particular direction and in the cases where more than one direction is attested, to support a comparison between them.” (p. 162). Directions are assigned chronologies based on the data in table 6.7.
After joining the information on direction to the Streets (STR) layer, the streets were given a three 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 as follows: Alternating streets (504 Periglacial); Blocked Streets (crosshatch [2pt separation]); Eastbound (70% gray); Northbound (Black); Southbound (White, black outline [0.40 line]); Two-Way streets (Mars red), Unknown (Gravel Foundation Overlay); Westbound (30% gray). There is 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.
Description: Basic Description: The polygon feature class Confidence - Detours Period (Post 62 CE) (filename- PBMP_DIR_City_Poly_001) represents the certainty values associated with each street at Pompeii for the period between 62 and 79 CE as published in table 6.7 of Poehler, Eric E. 2017. The Traffic Systems of Pompeii (New York: Oxford University Press). This map does not appear in that book.
Data History: The attribute data for these features were derived from figure 6.13 and table 6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Definitions of certainty type values (0 though 5) are as follows: “0: No directions present; 1: Direction present, cannot fit pattern. Excluded; 2: Multiple directions present, no relations to pattern; 3: 3a. Multiple directions present, sorted by relation to pattern, 3b. Only one direction, fits pattern, 3c. Multiple directions, alternating street; 4: 4a. Older direction blocked by object, new on opposite corner; 4b. Older direction associated with deep ruts, new with fainter; 5: 5a. New direction cuts older on same stone, 5b. New direction on a stone that blocks older.” (p. 187, caption for figure 6.13).
After joining the information on certainty types to the Streets (STR) layer, the streets were given a three 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 on a color ramp (Errors) from beige (0) to orange (3) to red (5). There is 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.
Name: Fig. 6.7 Directions - Drainage Period (c. 1-62 CE)
Display Field: Name
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Basic Description: The polygon feature class Fig. 6.7 Directions - Drainage Period (c. 1-62 CE) (filename- PBMP_DIR_City_Poly_001) represents the direction of one-way streets at Pompeii between c. 1 and 62 CE as published in figure 6.7 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 6.7 and tables 6.5-6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Calculations of the evidence from all street features were made as follows: “The total number of wearing patterns attested for each direction as well as the total clarity (certainty) of those interpretations is given in the first two columns of each direction [in tables 6.5 and 6.6]. Following these is the percentage of all certainty values on a street that a direction represents. For example, the total certainty value for the westbound direction of traffic on vicolo di Mercurio is 92, which is combined with the certainty values for eastbound traffic (57) to make up 61.7% of all the directional evidence on that street. For each direction the average certainty of the interpretations on that street is given as a way to assess the overall strength of the evidence supporting a particular direction and in the cases where more than one direction is attested, to support a comparison between them.” (p. 162). Directions are assigned chronologies based on the data in table 6.7.
After joining the information on direction to the Streets (STR) layer, the streets were given a three 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 as follows: Alternating streets (504 Periglacial); Blocked Streets (crosshatch [2pt separation]); Eastbound (70% gray); Northbound (Black); Southbound (White, black outline [0.40 line]); Two-Way streets (Mars red), Unknown (Gravel Foundation Overlay); Westbound (30% gray). There is 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.
Description: Basic Description: The polygon feature class Confidence - Drainage Period (c. 1-62 CE) (filename- PBMP_DIR_City_Poly_001) represents the certainty values associated with each street at Pompeii for the period between 1 and 62 CE as published in table 6.7 of Poehler, Eric E. 2017. The Traffic Systems of Pompeii (New York: Oxford University Press). This map does not appear in that book.
Data History: The attribute data for these features were derived from figure 6.13 and table 6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Definitions of certainty type values (0 though 5) are as follows: “0: No directions present; 1: Direction present, cannot fit pattern. Excluded; 2: Multiple directions present, no relations to pattern; 3: 3a. Multiple directions present, sorted by relation to pattern, 3b. Only one direction, fits pattern, 3c. Multiple directions, alternating street; 4: 4a. Older direction blocked by object, new on opposite corner; 4b. Older direction associated with deep ruts, new with fainter; 5: 5a. New direction cuts older on same stone, 5b. New direction on a stone that blocks older.” (p. 187, caption for figure 6.13).
After joining the information on certainty types to the Streets (STR) layer, the streets were given a three 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 on a color ramp (Errors) from beige (0) to orange (3) to red (5). There is 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.
Name: Fig. 6.6 Directions - Fountains Period (c. 20-1 BCE)
Display Field: Name
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Basic Description: The polygon feature class Fig. 6.6 Directions - Fountains Period (c. 20-1 BCE) (filename- PBMP_DIR_City_Poly_001) represents the direction of one-way streets at Pompeii between 62 and 79 CE as published in figure 6.6 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 6.6 and tables 6.5-6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Calculations of the evidence from all street features were made as follows: “The total number of wearing patterns attested for each direction as well as the total clarity (certainty) of those interpretations is given in the first two columns of each direction [in tables 6.5 and 6.6]. Following these is the percentage of all certainty values on a street that a direction represents. For example, the total certainty value for the westbound direction of traffic on vicolo di Mercurio is 92, which is combined with the certainty values for eastbound traffic (57) to make up 61.7% of all the directional evidence on that street. For each direction the average certainty of the interpretations on that street is given as a way to assess the overall strength of the evidence supporting a particular direction and in the cases where more than one direction is attested, to support a comparison between them.” (p. 162). Directions are assigned chronologies based on the data in table 6.7.
After joining the information on direction to the Streets (STR) layer, the streets were given a three 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 as follows: Alternating streets (504 Periglacial); Blocked Streets (crosshatch [2pt separation]); Eastbound (70% gray); Northbound (Black); Southbound (White, black outline [0.40 line]); Two-Way streets (Mars red), Unknown (Gravel Foundation Overlay); Westbound (30% gray). There is 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.
Description: Basic Description: The polygon feature class Confidence - Fountains Period (c. 20-1 BCE) (filename- PBMP_DIR_City_Poly_001) represents the certainty values associated with each street at Pompeii for the period between c. 20 and 1 BCE as published in table 6.7 of Poehler, Eric E. 2017. The Traffic Systems of Pompeii (New York: Oxford University Press). This map does not appear in that book.
Data History: The attribute data for these features were derived from figure 6.13 and table 6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Definitions of certainty type values (0 though 5) are as follows: “0: No directions present; 1: Direction present, cannot fit pattern. Excluded; 2: Multiple directions present, no relations to pattern; 3: 3a. Multiple directions present, sorted by relation to pattern, 3b. Only one direction, fits pattern, 3c. Multiple directions, alternating street; 4: 4a. Older direction blocked by object, new on opposite corner; 4b. Older direction associated with deep ruts, new with fainter; 5: 5a. New direction cuts older on same stone, 5b. New direction on a stone that blocks older.” (p. 187, caption for figure 6.13).
After joining the information on certainty types to the Streets (STR) layer, the streets were given a three 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 on a color ramp (Errors) from beige (0) to orange (3) to red (5). There is 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.
Name: Fig. 6.5 Directions - Diverging Period (Pre 20 BCE)
Display Field: Name
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Basic Description: The polygon feature class Fig. 6.5 Directions - Diverging Period (Pre 20 BCE) (filename- PBMP_DIR_City_Poly_001) represents the direction of one-way streets at Pompeii prior to 20 BCE as published in figure 6.5 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 6.5 and tables 6.5-6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Calculations of the evidence from all street features were made as follows: “The total number of wearing patterns attested for each direction as well as the total clarity (certainty) of those interpretations is given in the first two columns of each direction [in tables 6.5 and 6.6]. Following these is the percentage of all certainty values on a street that a direction represents. For example, the total certainty value for the westbound direction of traffic on vicolo di Mercurio is 92, which is combined with the certainty values for eastbound traffic (57) to make up 61.7% of all the directional evidence on that street. For each direction the average certainty of the interpretations on that street is given as a way to assess the overall strength of the evidence supporting a particular direction and in the cases where more than one direction is attested, to support a comparison between them.” (p. 162). Directions are assigned chronologies based on the data in table 6.7.
After joining the information on direction to the Streets (STR) layer, the streets were given a three 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 as follows: Alternating streets (504 Periglacial); Blocked Streets (crosshatch [2pt separation]); Eastbound (70% gray); Northbound (Black); Southbound (White, black outline [0.40 line]); Two-Way streets (Mars red), Unknown (Gravel Foundation Overlay); Westbound (30% gray). There is 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.
Description: Basic Description: The polygon feature class Confidence - Diverging Period (Pre 20 BCE) (filename- PBMP_DIR_City_Poly_001) represents the certainty values associated with each street at Pompeii for the period prior to 20 BCE as published in table 6.7 of Poehler, Eric E. 2017. The Traffic Systems of Pompeii (New York: Oxford University Press). This map does not appear in that book.
Data History: The attribute data for these features were derived from figure 6.13 and table 6.7 of Poehler, E. The Traffic Systems of Pompeii (New York: Oxford University Press) and were produced by in-field observation and documentation by the author between 1998 and 2016. Definitions of certainty type values (0 though 5) are as follows: “0: No directions present; 1: Direction present, cannot fit pattern. Excluded; 2: Multiple directions present, no relations to pattern; 3: 3a. Multiple directions present, sorted by relation to pattern, 3b. Only one direction, fits pattern, 3c. Multiple directions, alternating street; 4: 4a. Older direction blocked by object, new on opposite corner; 4b. Older direction associated with deep ruts, new with fainter; 5: 5a. New direction cuts older on same stone, 5b. New direction on a stone that blocks older.” (p. 187, caption for figure 6.13).
After joining the information on certainty types to the Streets (STR) layer, the streets were given a three 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 on a color ramp (Errors) from beige (0) to orange (3) to red (5). There is 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.