NTF¶
NTF files are mostly used by the United Kingdom Ordnance Survey (OS). For more on the Ordnance Survey, see their website at: https://ordnancesurvey.co.uk/
File listing¶
NTF files have an NTF extension.
Data Access / Connection Method¶
NTF access requires OGR's UK .NTF driver.
The path to the NTF file is required in the CONNECTION string. It may be relative to the SHAPEPATH setting in the mapfile or the full path.
The DATA parameter is used to specify the layer to use
OGRINFO Examples¶
Using ogrinfo on an NTF file to retrieve layer names:
> ogrinfo llcontours.ntf
ERROR 4: NTF Driver doesn't support update.
Had to open data source read-only.
INFO: Open of `llcontours.ntf'
using driver `UK .NTF' successful.
1: LANDLINE_POINT (Point)
2: LANDLINE_LINE (Line String)
3: LANDLINE_NAME (Point)
4: FEATURE_CLASSES (None)
Using ogrinfo to examine the structure of an NTF layer:
> ogrinfo llcontours.ntf LANDLINE_LINE -summary
ERROR 4: NTF Driver doesn't support update.
Had to open data source read-only.
INFO: Open of `llcontours.ntf'
using driver `UK .NTF' successful.
Layer name: LANDLINE_LINE
Geometry: Line String
Feature Count: 491
Extent: (279000.000000, 187000.000000) - (280000.000000, 188000.000000)
Layer SRS WKT:
PROJCS["OSGB 1936 / British National Grid",
GEOGCS["OSGB 1936",
DATUM["OSGB_1936",
SPHEROID["Airy 1830",6377563.396,299.3249646,
AUTHORITY["EPSG","7001"]],
AUTHORITY["EPSG","6277"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4277"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",49],
PARAMETER["central_meridian",-2],
PARAMETER["scale_factor",0.999601272],
PARAMETER["false_easting",400000],
PARAMETER["false_northing",-100000],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","27700"]]
LINE_ID: Integer (6.0)
FEAT_CODE: String (4.0)
...
Mapfile Example:
LAYER
NAME "ntf_uk"
TYPE LINE
STATUS ON
CONNECTIONTYPE OGR
CONNECTION "./ntf/llcontours.ntf"
DATA "LANDLINE_LINE"
CLASS
NAME "Contours"
STYLE
COLOR 0 150 200
END #style
END #class
END #layer