NTF

NTF文件主要由英国军械调查局（OS）使用。有关军械调查的更多信息，请访问他们的网站：http://www.ordnance survey.co.uk/oswebsite/

文件列表

ntf文件具有ntf扩展名。

数据访问/连接方法

• NTF访问需要OGR。

• 连接字符串中需要ntf文件的路径。它可能与 Mapfile 中的shapepath设置或完整路径相关。

• 数据参数用于指定要使用的层

Ogrinfo示例

在ntf文件上使用ogrinfo检索层名称：

> 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)

使用ogrinfo检查NTF层的结构：

> 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 示例：

  LAYER
    NAME ntf_uk
    TYPE LINE
    CONNECTIONTYPE OGR
    CONNECTION "./ntf/llcontours.ntf"
DATA "LANDLINE_LINE"
    STATUS DEFAULT
    CLASS
      NAME "Contours"
  STYLE
          COLOR 0 150 200
  END
    END
  END