OS Terrain 50

This page lists the methods that deal with loading the OS Terrain 50 data set.

Alphabetical list:

• DataNotFoundError()

• download_os_terrain_50

• gb()

• spacing()

Accessing the data

nevis.gb(downsampling=None)

Returns an array of elevation data for Great Britain, with height in meters and grid points spaced 50m apart.

Array indices are (height, width), also known as (northings, eastings).

A downsampled version can be returned for testing purposes, by setting downsampling to any integer greater than one.

nevis.spacing()

Returns the spacing between any two grid points.

Downloading the data

nevis.download_os_terrain_50(force=False)

Downloads, unpacks and processes the OS Terrain 50 data set.

If a previously downloaded zip file is found then the downloading step is skipped, unless force is set to True.

If a previously unpacked and processed file is found, this method does nothing unless force is set to True.

class nevis.DataNotFoundError

Raised when the OS Terrain 50 data is not found.

with_traceback()

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.