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 Topo500 |
| 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. |
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| 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/regulatory/place-names/find-place-name/find-m%C4%81ori-place-names-dual-names-and-alternative-names for a list of places or feature names within New Zealand that are gazetted and include macrons |
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| 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 |
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| 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. |
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| tunnel_type | 1105 type string |
Values
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| tunnel_status | 1106 status string |
Values
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| 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. | |||||||||
| UFID | 1000 t50_fid integer |
A unique identifier for use on Topo50 data in the LINZ Data Service. This is not a universal ID. The intention is to manage these ID’s as persistent, however this is not guaranteed and there will be instances where what appears to be a minor change to a feature may result in a new ID being assigned. |
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* See explanation of attribute values for more information about how attribute values are represented.
Change log
| Feature version | Revised | Description |
|---|---|---|
| 8 | 2014-11-14 | Removed 'canal' from tunnel_use1 and 2; canal tunnels are captured using pipeline_cl with 'underground' and 'water' attributes |
| 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 |