All the GRASS commands you are used to will still work
as they did before except that newly
modified programs will treat 0's in your old maps as no data cells.
What about us poor people who have old maps where 0=zero? What do you
suggest we do?? I am quite concerned that I am going to left with a large
number of maps that do not behave how I need them to any more. I suggest
that with the introduction of such a radical change that it is fairly
irresponsible to leave some of us in the lurch. At least provide a utility
to allow me to convert my old maps into the new format. I don't think that
this is my job either since it is the software that has been changed, not
my data.
Simon Cox
___________________________________________________________
Dr Simon Cox __ \
CSIRO Exploration & Mining ,~' L_|\ Australian
39 Fairway, PO Box 437, ;-' \ Geodynamics
Nedlands, WA 6009 Australia ( \ Cooperative
Phone +61 9 389 8421 + ___ / Research
Fax +61 9 389 1906 L~~' "\__/ Centre
s.cox@dem.csiro.au 7
___________________________________________________________
s.cox@dem.csiro.au (Simon Cox) writes:
All the GRASS commands you are used to will still work
as they did before except that newly
modified programs will treat 0's in your old maps as no data cells.
What about us poor people who have old maps where 0=zero? What do you
suggest we do?? I am quite concerned that I am going to left with a large
number of maps that do not behave how I need them to any more. I suggest
that with the introduction of such a radical change that it is fairly
irresponsible to leave some of us in the lurch. At least provide a utility
to allow me to convert my old maps into the new format. I don't think that
this is my job either since it is the software that has been changed, not
my data.
Simon Cox
I modified r.support to have an option to crerate a null file for your
existing map describing all cells as valid data (i.e. after running it for
your map, 0's will be 0's , not nulls.
Here is the new interface:
Enter name of raster file for which you will create/modify support files
Enter 'list' for a list of existing raster files
Enter 'list -f' for a list with titles
Hit RETURN to cancel request
asp.i
<asp.i>
Edit the header for [asp.i]? (y/n) [n]
Update the stats (histogram,range) for [asp.i]? (y/n) [n]
Edit the category file for [asp.i]? (y/n) [n]
Create/Update the color table for [asp.i]? (y/n) [n]
Edit the history file for [asp.i]? (y/n) [n]
The null file for [asp.i] might indicate that some cells contain
no data. If null file for [asp.i] doesn't exist all zero cells in [asp.i]
are treated by GRASS application programs as no data.
Do you want to create/reset null file for [asp.i] so that
all cell values are considered valid data? (y/n) [n]
Do you want to delete null file for [asp.i]
(all zero cells will then be considered no data)? (y/n) [n]
Also we are planning to write a new program: r.null
so that one can specify which values in the map are nulls, and
which are valid. Please see my home page for more info
on this.
Olga