NDHUB.AmbulanceServiceAreas

SDE Feature Class

Tags
North Dakota, USA, Boundaries, Ambulance, Emergency Services

Description

North Dakota statewide ambulance service area polygons. The data was created in 2011 to replace an earlier dataset that was obsolete and contained topology errors. The dataset was compiled from the following data sources: North Dakota state maintained county boundaries, ambulance service area shapefiles provided by some counties, PDF files provided by some counties that showed ambulance service boundaries, and a shapefile from Bullberry Services.

Update 3/30/2012: Additional attributes were added to the data to show total area of each ASA in square miles and the total population for each ASA based on the 2010 US Census. The following methodologies were used:

Update 3/30/2012: To calculate area in square miles, the calculation was made in ArcGIS Desktop within a data frame where the projection was set to Albers Equal Area in order to preserve area and obtain accurate calculations.

Update 3/30/2012: To calculate population totals for each ASA, the following method was used. A shapefile was obtained from the US Census that contained census block geometry with population totals for each block. For each ASA, a spatial query was performed where all census blocks whose geographic centroid was within the ASA were selected. The total population for each of these selected census blocks was then summed and appended to the ASA in question. The resulting population totals for each ASA can be considered as very close approximations of the actual population totals. This is because census block polygons do not precisely match ASA boundaries. In most cases ASA boundaries and census block boundaries do match each other but in some cases they do not. In such cases, the total for the block in question is added to the sum of the ASA where the block centroid falls within. Because census block geographies are much smaller than ASA geographies, the "error" introduced with this method is estimated to be small. Furthermore, given available data, this is considered the best approximation of the true total polulation for each ASA short of conduction a new census based on ASA polygons.


Summary

North Dakota statewide ambulance service area polygons used for cartographic representation and spatial analysis.

Credits

Applied Data Consultants, Inc. compiled the statewide dataset and ongoing maintenance is completed as needed by the North Dakota Department of Health Division of Emergency Medical Services.

Use limitations

The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available. This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication. The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files. The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.

Scale Range

Metadata 

Topics and Keywords 

Themes or categories of the resource  health, location, society


*Content type  Downloadable Data


Theme keywords  Ambulance

Theme keywords  Emergency Services

Citation 

*Title NDHUB.AmbulanceServiceAreas


Presentation formats  digital map


Citation Contacts 

Responsible party
Individual's name Lindsey Narloch
Organization's name North Dakota Department of Health Division of EMS and Trauma
Contact's position Research Analyst
Contact's role  custodian


Contact information
Phone
Voice 701.328.1062

Address
e-mail addresslindseybnarloch@nd.gov



Resource Details 

Dataset languages  English ()
Dataset character set  utf8 - 8 bit UCS Transfer Format


Spatial representation type  vector


*Processing environment Microsoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.5.4400


Credits
*Name NDHUB.AmbulanceServiceAreas

Extents 

Extent
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -104.048894
*East longitude -96.554483
*North latitude 49.000586
*South latitude 45.934976
*Extent contains the resource Yes

Extent in the item's coordinate system
*West longitude -104.048894
*East longitude -96.554483
*South latitude 45.934976
*North latitude 49.000586
*Extent contains the resource Yes

Resource Points of Contact 

Point of contact
Individual's name Lindsey Narloch
Organization's name North Dakota Department of Health Division of Emergency Medical Services
Contact's position Research Analyst
Contact's role  custodian


Contact information
Phone
Voice 701.328.1062

Address
e-mail addresslindseybnarloch@nd.gov



Resource Maintenance 

Resource maintenance
Update frequency  as needed


Scope of the updates  feature


Resource Constraints 

Constraints
Limitations of use
The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available. This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication. The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files. The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.

Constraints
Limitations of use
The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available. This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication. The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files. The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.

Spatial Reference 

ArcGIS coordinate system
*Type Geographic
*Geographic coordinate reference GCS_North_American_1983
*Coordinate reference details
Geographic coordinate system
Well-known identifier 4269
X origin -400
Y origin -400
XY scale 999999999.99999988
Z origin 0
Z scale 1
M origin 0
M scale 1
XY tolerance 8.98315284119521e-009
Z tolerance 0.001
M tolerance 0.001
High precision true
Left longitude -180
Well-known text GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983", SPHEROID["GRS_1980", 6378137.0, 298.257222101]], PRIMEM["Greenwich", 0.0], UNIT["Degree", 0.0174532925199433], AUTHORITY["EPSG", 4269]]

Reference system identifier
Value 4326
*Codespace EPSG
*Version 7.4.1


Spatial Data Properties 

Vector
*Level of topology for this dataset  geometry only


Geometric objects
Feature class name NDHUB.AmbulanceServiceAreas
*Object type  composite
*Object count 130



ArcGIS Feature Class Properties
*Feature type Simple
*Geometry type Polygon
*Has topology FALSE
*Feature count 130
*Spatial index TRUE
*Linear referencing FALSE



Lineage 

Lineage statement
Because ambulance service areas (ASA) frequently follow county boundaries, the county boundary dataset maintained by the state of North Dakota was used as the starting point for data creation. Then, ASA boundaries that do not follow county boundaries were added using the shapefiles and georeferenced image files provided by each county. These lines were then constructed to form polygons where ASA's that cross county boundaries were represented as multiple polygons. Each of these polygons was attributed with the correct ambulance license number. The polygons were then dissolved by license number to form the final ASA polygons. License number was then used to join the polygons to attributes from a spreadsheet. 

Distribution 

Distribution format
*Name SDE Feature Class


Transfer options
Online source
Locationhttp://web.apps.state.nd.us/hubdataportal/srv/en/main.home

Fields 

Details for object NDHUB.AmbulanceServiceAreas 
*Type Feature Class
*Row count 130


Field OBJECTID
 
*Alias OBJECTID
*Data type OID
*Width 4
*Precision 10
*Scale 0
*Field description
Internal feature number.

*Description source
ESRI

*Description of values
Sequential unique whole numbers that are automatically generated.





Field SHAPE
 
*Alias SHAPE
*Data type Geometry
*Width 4
*Precision 0
*Scale 0
*Field description
Feature geometry.

*Description source
ESRI

*Description of values
Coordinates defining the features.





Field License_Certification_Number
 
*Alias LICENSE_CERTIFICATION_NUMBER
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field Company
 
*Alias COMPANY
*Data type String
*Width 255
*Precision 0
*Scale 0




Field Mailing_Address
 
*Alias ADDRESS_MAILING
*Data type String
*Width 255
*Precision 0
*Scale 0




Field City
 
*Alias CITY_MAILING
*Data type String
*Width 255
*Precision 0
*Scale 0




Field State
 
*Alias STATE_MAILING
*Data type String
*Width 255
*Precision 0
*Scale 0




Field Zip
 
*Alias ZIP_MAILING
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field Physical_Address
 
*Alias ADDRESS_PHYSICAL
*Data type String
*Width 255
*Precision 0
*Scale 0




Field City1
 
*Alias CITY_PHYSICAL
*Data type String
*Width 255
*Precision 0
*Scale 0




Field State1
 
*Alias STATE_PHYSICAL
*Data type String
*Width 255
*Precision 0
*Scale 0




Field Ship_Zip
 
*Alias ZIP_PHYSICAL
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field LEVEL_
 
*Alias LEVELOFSERVICE
*Data type String
*Width 255
*Precision 0
*Scale 0




Field County
 
*Alias COUNTY
*Data type String
*Width 255
*Precision 0
*Scale 0




Field Affiliated_Ambulance
 
*Alias AFFILIATED_AMBULANCE
*Data type String
*Width 255
*Precision 0
*Scale 0




Field total_pop
 
*Alias TOTALPOP2010
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field square_miles
 
*Alias SQUARE_MILES
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field SHAPE.AREA
 
*Alias SHAPE.AREA
*Data type Double
*Width 0
*Precision 0
*Scale 0




Field SHAPE.LEN
 
*Alias SHAPE.LEN
*Data type Double
*Width 0
*Precision 0
*Scale 0






Metadata Details 

Metadata language English (UNITED STATES)
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata  dataset
Scope name* dataset


*Last update 2012-10-26


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Metadata style North American Profile of ISO19115 2003
Standard or profile used to edit metadata NAP


Created in ArcGIS for the item 2012-06-07 08:16:33
Last modified in ArcGIS for the item 2012-10-26 09:24:52


Automatic updates
Have been performed Yes
Last update 2012-10-26 09:24:52


Metadata Contacts 

Metadata contact
Individual's name Lindsey Narloch
Organization's name North Dakota Department of Health Division of Emergency Medical Services
Contact's position Research Analyst
Contact's role  custodian


Contact information
Phone
Voice 701.328.1062

Address
e-mail addresslindseybnarloch@nd.gov



Metadata Maintenance 

Maintenance
Update frequency  as needed


Scope of the updates  feature


Metadata Constraints 

Constraints
Limitations of use
The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available. This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication. The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files. The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.