Hi Patricia, On Tue, Jun 6, 2017 at 9:16 PM, Szalona P <[email protected]> wrote: > Hello :D My name is Patricia and need help with GRASS. Will be visible if you > help me find some information about the GRASS operation:D
Much is covered here: https://grass.osgeo.org/grass72/manuals/index.html and nice tutorials are here: https://grass.osgeo.org/documentation/tutorials/ > So I need to know : > 1.What is the proper sequence of the basic elements of the GRASS > hierarchical data structure? You can find that here in a graphical view: https://svn.osgeo.org/grass/grass/trunk/doc/grass_database.png and more detailed here: https://grass.osgeo.org/grass72/manuals/helptext.html#2.-background:-grass-gis-location-structure > 2.Does g.region have mandatory parameters? If yes, then specify what ? In general no, it can run with a single flag like "-p" for print the current region. See https://grass.osgeo.org/grass72/manuals/g.region.html > 3.To open multiple graphical monitors, command line mode allows the GRASS > system ? You can use d.mon wx0 see https://grass.osgeo.org/grass72/manuals/d.mon.html > 4.What is the full (obligatory) syntax of a command that allows you to > display basic GRASS layer information? d.rast rastermap d.vect vectormap > 5.How do you know the parameters of a region assigned to a raster layer > called powiats? Enter a command or command to let you know. g.region raster=powiats -p > 6.The command syntax along with the appropriate parameter to display the > vector layers available in the system? g.list vector > 7.Command name and its mandatory parameters to display a composite image > composed of three RGB color channels. Layer names can be fictitious d.rgb ... :-) > 8After changing the working area (computational), this information should be > passed to the graphical command line mode window. Give commands that you can > use d.erase > 9.To test how many pixels in the raster layer have a given average value, > use the command > Along with the parameters (flags): There are different possibilities, eg with r.mapcalc or r.stats or others. > 10. > Write the command syntax along with the formula (raster map calculator), > which will give you a new raster floating point class, called alpha, as a > result of the formula calculation: > alfa=(2⋅sin(srednia"\_"beta))/3 Similar to what you wrote but be sure to have white space left and right from the " = " sign. > 11 > Write a command syntax that will allow you to calculate the TVI vegetative > index. The input layers are landsat_band3 and landsat_band4. > TVI=√((NDVI+0.5) ) Check i.vi and r.mapcalc. > I really needs help because nobody at all does not want to give me any > information:/ HTH, Markus -- Markus Neteler, PhD http://www.mundialis.de - free data with free software http://grass.osgeo.org http://courses.neteler.org/blog _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
