[GRASS-dev] On (Landsat) imagery naming patterns

[Nikos Alexandris]

Greetings to the dev-list.

I successfully tested <i.histo.match>, by feeding it with 12 Landsat scenes 
(working on identical bands, different Path/Row tiles) in one go.  It works and 
I really enjoy it.

However, there is some "problem":

<i.histo.match> wont accept the "." character as part of the image/raster map 
names.  This is an SQL restriction (thanks Luca D for the quick help) as the 
module utilises sqlite internally for the calculations.

Although I am familiar with this restriction,  due to pressing deadlines, I 
overlooked that "point" while designing my workflow and decided to go for a 
specific naming pattern for all Landsat scenes at each (pre-)processing step 
(working currently on 25+ tiles, for summer and winter that cover the entire 
Greek territory).

In addition,  the respective manuals for modules like <i.landsat.toar>, 
<i.landsat.acca>, <i.topo.corr> hold in their examples/descriptions (thus, 
someone can easily interpret that these modules "encourage" the use of) names 
like "B.", "B.toar", "toar.5", et.c.


I certainly like to keep, while on intermediate processing steps, long names 
whose parts are separated by either the underscore character ( _ ) or the dot 
character ( . ).

This is, from my point of view, an inconsistency which adds-up some confusion 
-- especially to new users who will try/need to use <i.histo.match> at some 
point.


As changing the module or adding internally a solution will add complexity, I 
guess it is better to adhere to some kind of "strict" naming rules/patterns in 
the manuals' examples, in the wiki and elsewhere?

In time I will try to propose new wording and examples for all Landsat related 
modules/manuals I have used/read.

GRASS has (almost) everything required for a "perfect" Landsat processing 
work-flow.  This small inconsistency breaks the harmony :-).

Best, N
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