[GRASS5] dig_plus file - How does it work?

[Flavio]

Hi John,

thanks a lot for help... that is a really good start. 
I also wish there were more documentation regarding topology. 
but anyway, thanks....

flavio

Em Terça 10 Fevereiro 2004 20:23, John Gillette escreveu:
> You are going to have to look in the code.  Start with
> <grass source>/src/include/vect/dig_structs.h
> which gives the definitions of all the structures used to store topology
> information.
>
> Then start looking through some vector programs to see how topology
> is used.  I have enclosed a simple program I worked on with another user
> to give an area adjacency list.  It shows how to use the structures
> to get area information.  I started this program
> by looking at v.rm.dangles.
>
> I never looked at the file structure because I didn't care.  I assume
> that the contents of all the structures are written to the dig_plus file.
>
> Note that this is 5.03 (or 5.3) information.  For 5.7 the vector
> format has changed, although I would guess that a lot of information
> is at least similar.
>
> I hope that helps.  I wish it was documented as it is fundamental to
> how vectors work.
>
> John