Hi Vidura,
First of all, please keep discussions on the list.
On 31/08/18 09:48, Vidura Dantanarayana wrote:
Hi Moritz,
Really appreciate your help as we are facing this problem for some days
now. First I'm a beginner user. Can you explain what are the categories
and how those used in GRASS GIS?
GRASS GIS is an extremely wonderful and powerful tool, but it does need
some initial learning in order to understand how to use it. Just
answering the questions below will not provide that for you.
I would suggest that you go through some of the basic introductory
material, just in order to get a feeling for GRASS GIS, before attacking
your specific problem.
You could have a look at the following resources (at least for their
introductory parts):
- https://grass.osgeo.org/grass74/manuals/helptext.html
- https://grass.osgeo.org/grass74/manuals/rasterintro.html
- https://grass.osgeo.org/grass74/manuals/vectorintro.html
-
https://grasswiki.osgeo.org/wiki/From_GRASS_GIS_novice_to_power_user_(workshop_at_FOSS4G_Boston_2017)
-
http://www.training.gismentors.eu/isprs-summer-school-2016/lesson1/grass-gis.html
Or search for "GRASS GIS" in YouTube for some videos.
Let's say I need to create custom
1hour_moisture (or any other file), so how can I create these files?
How you create these files depends on the data that you have as input.
If you look at the metadata of the file in the demolocation
(right-click->Metadata or 'r.info 1hour_moisture' you will this
information at the end:
| Data Description:
|
| generated by r.mapcalc
|
|
|
| Comments:
|
| if(fuel_class==4,3,if(fuel_class==8,15))
This means that the authors had a raster file called 'fuel_class' and
used the raster calculator (r.mapcalc) to reclass that file attributing
the value 3 to those pixels who had class=4 in the original map and
value 15 to pixels with class=8.
I have no idea what this original map contained, so cannot help you
further (I don't know much about fire spread modeling).
Can
you look at the following problem again?
# 1 categories -----------------------------------------------------> (1)
Map of Fire Origin of Bass River Fire --------------------> (2)
0.00 0.00 0.00 0.00 ---------------------------------------------> (3)
0:no data -----------------------------------------------------------> (4)
1:fire origin ---------------------------------------------------------> (5)
I need to know how to customize the location of origin. I mean, I want
to ignite the fire from another place rather the place specified in demo
data.
If you have the origin location as coordinates, you can create a vector
point at the location using v.in.ascii: in the GUI of that module you
can enter coordinates interactively. Then you convert the map to a
raster map using v.to.rast.
Moritz
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