NZ Topo - object class tunnel_cl
This page describe the tunnel_cl object class used to represent
objects in the NZTopo topographic database.
Description
An underground passage
Topo50 description
Tunnels are held in the data at their true size; tunnels less than 50m in length are shown on the printed maps with a length of 50m. Note that only prominent "livestock" tunnels are held in the data and shown on the printed maps.
Topo250 description
Only those significant by their size or location are held in the Topo250 data and shown on the Topo250 printed maps; these are a generalised subset of those shown on the Topo50 series
See also:
railway_cl road_cl track_cl
Class attributes
| Attribute | Value |
|---|
| Object class | tunnel_cl |
| Entity class | TUNNEL |
| Additional entity class | Not applicable |
| Object inheritance | simple_line |
| Entity source | US Standard Entity |
| Map series | Topo50 Topo250 |
| LSLIFF object class | 173 |
Object attributes
| Attribute | LSLIFF code | Shapefile field | Data type | Attribute description | Attribute values* |
|---|
| name | 1001 | name | string | Name of the tunnel, where known.
Text data from July 2012 will be in UTF-8 format. If your system is not UTF-8 compliant, you will need to use the name_ascii attribute, which has had any macronated vowels removed.
UTF-8 stands for Unicode Transformation Format-8. It is an octet (8-bit) lossless encoding of Unicode characters.
UTF-8 encodes each Unicode character as a variable number of 1 to 4 octets, where the number of octets depends on the integer value assigned to the Unicode character.
It is an efficient encoding of Unicode documents that use mostly US-ASCII characters because it represents each character in the range U+0000 through U+007F as a single octet. UTF-8 is the default encoding for XML.
| |
| name_macronated | 1140 | macronated | boolean | Indicates whether the entry in the name_ascii field contains a macronated vowel. Where the value is "Y" go to http://www.linz.govt.nz/placenames/find-names/macrons/index.aspx for a list of places or feature names within New Zealand that are gazetted and include macrons | |
| tunnel_use1 | 1103 | use1 | string | The predominant traffic or utility that uses the tunnel. Where the predominant use is unknown this field is left empty | | cablecar | | canal | | foot traffic | | livestock | | river | | tram | | train | | vehicle | | {empty} |
|
| tunnel_use2 | 1104 | use2 | string | A secondary category of traffic or utility using the tunnel. Where no secondary use exists or is known, this field is left empty. | | cablecar | | canal | | foot traffic | | livestock | | river | | tram | | train | | vehicle | | {empty} |
|
| tunnel_type | 1105 | type | string | | natural | A naturally occuring tunnel | | {empty} | A man-made tunnel |
| |
| tunnel_status | 1106 | status | string | | derelict | In a state of disrepair, no longer safe to use. |
| | derelict | | disused | | under construction | | {empty} |
|
| name_ascii | 9000 | name_ascii | string | Text data from July 2012 will be in UTF-8 format. If your system is not UTF-8 compliant, you will need to use this attribute, which has had any macronated vowels removed.
| |
* See explanation of attribute values for more information about how attribute values are represented.
Change log
| Feature version | Revised | Description |
|---|
| 7 | 2012-08-28 | Updated map image and aerial view; added representation specification and example feature photographs |
| 6 | 2012-08-28 | Added scale-specific definitions |
| 5 | 2012-08-16 | Name attribute in UTF-8 format; added name_ascii attribute |
| 4 | 2010-03-01 | removed values from tunnel_use1 and tunnel_use2 and added name_macronated attribute |
| 3 | 2001-11-23 | unspecified update |
| 2 | 2000-07-31 | new attribute |
| 1 | 1999-03-01 | intial status |
