Hi all, Thank you very much Moritz Lennert for the explanation and apologize for the mistake I've done. I will try what you suggest by myself. Hope It's okay to questioning again if I found a problem again. Have a wonderful day. Cheers!!!
BR, Vidura Dantanarayana. On Sat, Sep 1, 2018 at 2:04 AM Moritz Lennert <[email protected]> wrote: > 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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