[GRASSLIST:3198] my first question

GRASS GRASS user
1

Hi,

Can GRASS do topological operations, like intersection, union and buffering for polygon, line and point?

Thanks

2

Can GRASS do topological operations, like intersection, union and
buffering for polygon, line and point?

Yes, but only in the new GRASS 5.7 version.

see:
http://mpa.itc.it/radim/g51/index.html
http://grass.ibiblio.org/grass51/tutorial/vectoroverlay.html
http://grass.ibiblio.org/grass51/tutorial/index.html

(GRASS 5.1 was renamed GRASS 5.7)

Hamish

3

On Sat, Apr 17, 2004 at 08:47:42AM -0700, Fei Li wrote:

Hi,

Can GRASS do topological operations, like intersection, union and buffering for polygon, line and point?

Yes, have a look at GRASS 5.7:

http://grass.itc.it/grass51/manuals/html57_user/vector.html
v.buffer
v.overlay

Some screenshots are here:

http://mpa.itc.it/radim/g51/index.html

(note: GRASS 5.1 = 5.7)

Cheers

Markus

4

Thanks

----- Original Message -----
From: "Markus Neteler" <neteler@itc.it>
To: <GRASSLIST@baylor.edu>
Sent: Sunday, April 18, 2004 4:14 AM
Subject: [GRASSLIST:3202] Re: my first question

On Sat, Apr 17, 2004 at 08:47:42AM -0700, Fei Li wrote:
> Hi,
>
> Can GRASS do topological operations, like intersection, union and

buffering for polygon, line and point?

Yes, have a look at GRASS 5.7:

http://grass.itc.it/grass51/manuals/html57_user/vector.html
v.buffer
v.overlay

Some screenshots are here:

http://mpa.itc.it/radim/g51/index.html

(note: GRASS 5.1 = 5.7)

Cheers

Markus

5

Hi,

After I read the tutorial I know what function GRASS has but I have no idea
how to work on it. So the tutorial is a realy an overview.

I need a real tutorial it can teach me how to work on GRASS step by step
through an example data set. Who can introduce one to me?

Thanks

6

Hi,

I want to make PC application and to take some function from GRASS. Which
libraries in GRASS are ANSI C or close to ANSI C. Is that hard to rewrite
GIS library and VECTOR library to ANSI C style? Is there any hidden dead
end?

Thanks

7

On Mon, 19 Apr 2004, Fei Li wrote:

Hi,

I want to make PC application and to take some function from GRASS. Which
libraries in GRASS are ANSI C or close to ANSI C. Is that hard to rewrite
GIS library and VECTOR library to ANSI C style?

This is what Thierry is doing; see http://www.kergis.org/
It also has a different licence from GRASS, so is potentially better for
including within other applications (that is the aim of it).

Paul

8

Hi,

Is a cygwin expert here? I have problem with it?

I have downloaded and installed it yesterday. When I run some configure
files it can stop on the half way and if I run them again it can go through,
why is that?

Thanks