Techni Graphic Systems, Inc., and North Carolina Center for Geographic Information and Analysis, 20070621, North Carolina Hurricane Evacuation Routes.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
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| Value | Definition |
|---|---|
| UNCLASSIFIED | Feature is unclassified |
| Value | Definition |
|---|---|
| INTERSTATE HIGHWAY | Feature is an Interstate Highway. |
| FEDERAL HIGHWAY | Feature is a Federal Highway. |
| STATE HIGHWAY | Feature is a State Highway. |
| STREET | Feature is a Street. |
| <BLANK> | Unknown or not provided. |
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| Value | Definition |
|---|---|
| Y | Indicates road segment is paved. |
| N | Indicates road segment is not paved. |
| <BLANK> | Unknown or not provided. |
| Value | Definition |
|---|---|
| Y | Indicates road segment has a median. |
| N | Indicates road segment does not have a median. |
| <BLANK> | Unknown or not provided. |
| Value | Definition |
|---|---|
| 1 | Road segment has 1 lane. |
| 2 | Road segment has 2-3 lanes. |
| 3 | Road segment has 4 or more lanes. |
| NA | Not available. |
| <BLANK> | Unknown or not provided. |
| Value | Definition |
|---|---|
| Y | Indicates road segment is a toll way. |
| N | Indicates road segment is not a toll way. |
| <BLANK> | Unknown or not provided. |
| Value | Definition |
|---|---|
| Y | Indicates road segment is a tunnel. |
| N | Indicates road segment is not a tunnel. |
| <BLANK> | Unknown or not provided. |
| Value | Definition |
|---|---|
| Y | Indicates road segment is a bridge. |
| N | Indicates road segment is not a bridge. |
| <BLANK> | Unknown or not provided. |
| Value | Definition |
|---|---|
| Y | Indicates road segment is a ramp. |
| N | Indicates road segment is not a ramp. |
| <BLANK> | Unknown or not provided. |
| Formal codeset | |
|---|---|
| Codeset Name: | USPS Address Information System |
| Codeset Source: | United States Postal Service |
| Formal codeset | |
|---|---|
| Codeset Name: | USPS Address Information System |
| Codeset Source: | United States Postal Service |
Number
| Value | Definition |
|---|---|
| Y | Indicates that direction of road has been changed from its original flow of traffic. |
| N | Indicates that direction of road has not been changed from its original flow of traffic. |
| <BLANK> | Unknown or not provided. |
| Formal codeset | |
|---|---|
| Codeset Name: | Official USPS Abbreviations - State Abbreviations |
| Codeset Source: | United States Postal Service <http://www.usps.com/ncsc/lookups/usps_abbreviations.html> |
| Value | Definition |
|---|---|
| Y | Indicates that evacuation route ends at a designated shelter. |
| N | Indicates that evacuation route does not end at a designated shelter. |
| <BLANK> | Unknown or not provided. |
330-263-6222 (voice)
330-263-6294 (FAX)
mthompson@tgstech.com
Homeland Security
Use Cases: Use cases describe how the data may be used and help to define and clarify requirements.
1) A resource for emergency route planning purposes.
2) A resource for situational awareness planning and response for federal government events.
3) A portion of an evacuation route may be rendered unusable due to natural or man made disaster and rerouting of traffic is necessary.
4) An incident has occurred during an evacuation and first responders must quickly deploy to the area.
5) Public awareness.
North Carolina Center for Geographic Information and Analysis, and North Carolina Corporate Geographic Database, 20040202, "her".Online Links:
NAVTEQ, 2006, NAVSTREETS.
1a) In some cases, the shape files provided by the states were determined to be unsuitable for inclusion in the completed dataset. In these cases, public maps from the state websites were substituted and processed as described below.
2) Hurricane evacuation routes depicted on non-GIS maps were digitized using aerial ortho imagery while referencing supplied maps and NAVTEQ_Streets_2006_Q3.
3) A state supplied shape (.shp) file from NC was used as received. All attribution was provided by the state and TGS did not verify these values.
4) TGS ensured connectivity by edge matching digitized evacuation routes and state supplied evacuation routes across state lines. TGS also eliminated or connected all orphaned segments.
5) Whenever possible, TGS attempted to attribute basic fields within state supplied data.
6) A seamless data layer was created by merging all shape files and by creating a standardized table structure.
7) The hurricane evacuation routes were reviewed by TGS' internal Quality Assurance. In addition to individual review, the dataset was examined in aggregate using the tests described under "Attribute_Accuracy_Report".
8) All text fields were set to all upper case.
9) Leading and trailing spaces were trimmed from all text fields.
10) Non printable and diacritic characters were removed from all text fields.
Person who carried out this activity:
330-263-6222 (voice)
nhackworth@tgstech.com
Data sources produced in this process:
ID Check: The [ID] attribute is not blank and all IDs are unique.
Connectivity Check: Ensured connectivity of digitized evacuation routes with state supplied evacuation routes that cross state lines. Eliminated or connected all orphaned segments.
Geometry Check: Ensures that all geometry is valid, such as: short segment, null geometry, incorrect segment orientation, and self intersections.
Repair Geometry Check: Repairs any invalid geometry found in the Geometry Check.
Hurricane evacuation routes depicted on non-GIS maps were digitized using aerial ortho imagery while referencing supplied maps and NAVTEQ_Streets_2006_Q3.
TGS ensured connectivity by edge matching digitized evacuation routes and state supplied evacuation routes across state lines. TGS also eliminated or connected all orphaned segments.
This dataset is based on information provided by the North Carolina Center for Geographic Information and Analysis.
All routes identified as primary evacuation routes are included in this dataset. If a state also designated secondary evacuation routes, they are included as well. Routes depicted in this dataset are dependent upon what each state identified as an evacuation route. Criteria used to identify these routes may vary from state to state.
See the "Attribute_Accuracy_Report" section. The checks described in that section check for both attribute accuracy and logical consistency.
Are there legal restrictions on access or use of the data?
- Access_Constraints: There are no access constraints
- Use_Constraints: There are no use constraints
330-263-6222 (voice)
330-263-6294 (FAX)
mthompson@tgstech.com