[GRASS-user] 3rd Grass Book Data Set

[Matthew Pulis]

Hi,

Whilst I am waiting for the book to arrive I have started playing a bit with
the sample dataset of North Carolina. I am interested in the streets layer
(dataset) since basiclaly I am about to do some routing work.

Can someone please be kind enough to explain to me what do these columns
represent?

frleft bigint,
toleft bigint,
frright bigint,
toright bigint,
frleft_a bigint,
toleft_a bigint,
frright_a bigint,
toright_a bigint,
one_way character varying(80),
ft_cost numeric,
tf_cost numeric,
shape_len numeric,
length double precision,

Also what is the difference between shape_len and length please?

My main concern are the one_ways and how I should treat them please.

Any help will be extremely appreciated!

Regards

Matthew

-- 
Matthew Pulis
URL : http://www.solutions-lab.net
MSN : pulis_matthew[@]hotmail.com
ICQ : 145951110
Skype : solutions-lab.net
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