[GRASSLIST:5401] Re: How to choose initial parameters?

[David Hine]

Hi Ben
The first steps are the hardest for sure. I think that using someone
elses data is the best and spearfish is there for using. Understanding
what the "database" is was the stumbling block for me. Its just the full
path to the data -- for me thats /home/David/grassdata, then having
untarred spearfish there, I use spearfish as the location.
But there were some long sessions getting that clear in my mind.
best wishes
David

On Thu, 2003-01-30 at 02:26, Ben Logan wrote:

    Hello, everyone.
    
    I have been thinking about writing an introductory tutorial for GRASS
    that would lead a total newbie to the point where I am...which isn't
    all that far along, but it's a start. :-)  The tutorial would have a
    very specific end (similar to the GRASS Seeds tutorial) as opposed to
    being a general introduction.
    
    Here's my problem:
    
    Let's say I haven't created a GRASS database yet.  I have some maps
    that I want to create a location for.  (The maps could be DEMs in UTM
    projection or might be shapefiles in a lat/lon projection.)  Since I
    don't have a database setup yet, I can't run the GRASS commands to get
    information from the map data.  How do I come up with all of that
    information necessary to creating a database?  Of particular interest
    to me is the choice of an ellipsoid.  Back when I first set my GRASS
    database up, I read somewhere that I should use the wgs84 ellipsoid.
    I can't remember where I read that, and maybe it's incorrect.  How do
    you know which to use, and what happens if you use the wrong one?
    
    I'd really appreciate any help understanding this.
    Ben
    
    -- 
    Ben Logan
    Google Answers Researcher
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    When you're searching for information, Google Answers.
    
    Harriet's Dining Observation:
    	In every restaurant, the hardness of the butter pats
    	increases in direct proportion to the softness of the bread.
    

-- 
David Hine
29 Pacific Pde
Mission Beach, Qld 4852
Tel/Fax: (07) 4088 6146


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