[GRASSLIST:4857] Re: transition probability

[Dylan Beaudette]

On Tuesday 16 November 2004 07:51 am, you wrote:
> Dylan,
>
> Thanks for summarizing this. I've tried to follow this and more or less see
> what you did, although I'd actually need to go through it to really
> understand it.
>
[snip]

Sure thing. I have just updated the site and made it a little more user 
friendly. 

http://169.237.35.250/~dylan/grass_and_tp/

As the week goes on I will continue to update the page, and should have a 
complete method by the end of this term (this is for a geostats class 
project...)

Dylan

>
> On 11/15/04 11:26 AM, "Dylan Beaudette" <dylan at iici.no-ip.org> wrote:
> > On Monday 15 November 2004 01:01 am, you wrote:
> >> You have to join the tables in Postgres.
> >> I hope to add join table to v.overlay later.
> >>
> >> Radim
> >
> > Thanks for the tip Radim.
> >
> > I was able to get the tables joined and re-attached to the vector layers
> > by using MySQL.
> >
> > if anyone is interested, I have started documenting the process here;
> > http://169.237.35.250/~dylan/grass_and_tp/
> >
> > i have noticed that the attribute management section on the GRASS 57
> > tutorial that -pertains to MySQL is empty. I would be willing to add to
> > that section if anyone is interested.
> >
> > Thank again!
> >
> > Dylan
> >
> >> Dylan Beaudette wrote:
> >>> On Saturday 13 November 2004 12:45 am, you wrote:
> >>>> Dylan Beaudette wrote:
> >>>>> If it hasn't, I am wondering if there are a couple of vector commands
> >>>>> that could do the following:
> >>>>>
> >>>>> given an input polygon map of several categories, and a line drawn
> >>>>> across these categories,
> >>>>>
> >>>>> 1. sample the polygon boundaries(and their respective category) that
> >>>>> the line intersects
> >>>>>
> >>>>> 2. put the above information into a new vector line that contains
> >>>>> line segments that have an attribute that matches the category of the
> >>>>> polygon that they intersected.
> >>>>
> >>>> v.overlay
> >>>>
> >>>> Radim
> >>>
> >>> Seems that I just figured out the answer to my last question in regards
> >>> to line vector types.
> >>>
> >>> However, I now have another perhaps more complicated problem..
> >>>
> >>> i have two maps:
> >>>
> >>> t_1 = line map containing a single line
> >>>
> >>> fresno_west = ploygon map with many polygons, and mulitple attributes
> >>> per polygon:
> >>> -------------------------
> >>>  db.describe -c fresno_west
> >>> Column 1: cat
> >>> Column 2: AREA
> >>> Column 3: PERIMETER
> >>> Column 4: CA653_A_
> >>> Column 5: CA653_A_ID
> >>> Column 6: MUSYM
> >>> Column 7: MUKEY
> >>> ...
> >>> ------------------------------
> >>> when i use v.overlay with ainput=t_1 atype=line binput=fresno_west
> >>> btype=area output=r_1 operator=and ...
> >>> I get a map with the following attribute columns:
> >>> ---------------------------
> >>> db.describe -c r_1
> >>> Column 1: cat
> >>> Column 2: cata
> >>> Column 3: catb
> >>> ---------------------------
> >>>
> >>> this is almost what i want, as each of the line segments in the
> >>> resulting map (r_1) is labeled with the category number corresponding
> >>> to the polygon that it intersected in the catb attribute column:
> >>> (http://basho.dept-lawr.ucdavis.edu/~dylan/temp/tp1.png)...
> >>>
> >>> this is great, but i need to join the attributes from the original
> >>> polygon file to the new line file r_1. i imagine that it would be a
> >>> join on: r_1.catb ---> fresno_west.cat
> >>> ...which should then allow corresponding attributes from fresno_west
> >>> (the polygon layer) to be connected to r_1 (the output from
> >>> v.overlay)...
> >>>
> >>> i am able to connect the attribute table from fresno_west to r_1 with
> >>> the command;
> >>> v.db.connect map=r_1 table=fresno_west key=catb field=2 -o
> >>>
> >>> ...but this does not produce the results that i am looking for as the
> >>> fresno_west table does not contain a 'catb' column...
> >>>
> >>> .... perhaps I am not fully comprehending the GRASS 57 vector attribute
> >>> system.. any ideas?
> >>>
> >>> many thanks!
>
> ______________________________
> Michael Barton, Professor of Anthropology
> School of Human, Evolution and Social Change
> Arizona State University
> Tempe, AZ  85287-2402
> USA
>
> voice: 480-965-6262; fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton

-- 
Dylan Beaudette
Soil Science Graduate Group
University of California at Davis