= How-To Test GRASS6 =

== Scope of this page ==

This pages is intended to users and developers who want to test a GRASS installation (test protocol). As side effect, you can also showcase GRASS 6 using these commands.

[[TOC]]

== Requirements ==

 * GRASS 6 installation ([wiki:DownloadSource source code] and [http://grass.osgeo.org/download/index.php binaries] download)
 * Educational data set: OSGeo Educational data set North Carolina: [http://grass.osgeo.org/sampledata/nc_spm_07_2007_dec20.tar.gz data] and [http://www.grassbook.org/data_menu3rd.php description].

Extract the NC sample data set for GRASS:

{{{
mkdir $HOME/grassdata
tar xvfz nc_spm_07_2007_dec20.tar.gz
}}}


== Start of the program ==

GRASS 6 is started either from the menu (if installed therein) or from command line. In all cases, select mapset "user1".

{{{
# show available options
grass63 --help
}}}

''Expected result: the help text should be shown.''

{{{
# start with old Tcl/Tk based graphical user interface (d.m)
grass63 -oldtcltk

# start with current Tcl/Tk based graphical user interface (g.gis)
grass63 -tcltk

# start with wxPython based graphical user interface
grass63 -wxpython
}}}

''Expected result: the selected graphical user interface should come up.''

{{{
# start with text based interface
grass63 -text
}}}

''Expected result: the text user interface should come up.''

== Re-launch of GUI from command line ==

{{{
# start with old Tcl/Tk based graphical user interface (d.m)
g.gui oldtcltk

# start with current Tcl/Tk based graphical user interface (g.gis)
g.gui tcltk

# start with wxPython based graphical user interface
g.gui wxpython
}}}

''Expected result: the selected graphical user interface should come up.''


== Using gis.m graphical user interface ==

 * Click in GIS manager on "Add raster" button,
 * click on word "raster" which appears in the canvas,
 * select "Raster name" button, select map "elevation",
 * click "ok", map name should appear in canvas,
 * click on "world map" button: should open GRASS map display
 * and show elevation map.
 * Try to zoom, to create a profile etc.

''Expected result: it should just work.''

== Using wxPython graphical user interface ==

 * Click in Layer manager on "Add raster map" button,
 * select raster map "elevation" in properties dialog and click "ok",
 * right mouse click in layer tree and choose from contextual menu "Zoom to selected map", map should appear in canvas.
 * Try to zoom, to create a profile etc.

''Expected result: it should just work.''

== Display various maps in GRASS monitor (not native winGRASS) ==

{{{
g.region rast=elevation
d.mon x0
d.rast elevation
d.vect roadsmajor
}}}

''Expected result: GRASS monitor should open and show the selected maps''

{{{
d.his i=elevation_shade h=elevation
d.vect roadsmajor

# set barscale position per mouse click into map:
d.barscale -mt
}}}

== 3D visualiztion with NVIZ ==

{{{
# raster map and 2D vector lines map
 nviz elevation vect=roadsmajor
}}}

{{{
# raster map and 2D vector lines map and 3D vector points
nviz elevation vect=roadsmajor points=precip_30ynormals_3d
}}}

Tests: navigate with the puck, interrogate map, etc. (ADD MORE)

''Expected result: should not crash at all but show maps as expected''

== Simple raster analysis ==

Raster analysis comprises a lot of functionality.

=== Raster algebra ===

Normalized Differences Vegetation Index (NDVI) from LANDSAT-TM7:

{{{
# set current region/resolution to map:
g.region rast=lsat7_2002_40 -p
# display metadata:
r.info -h lsat7_2002_40
# generate NDVI:
r.mapcalc "ndvi = 1.0 *  (lsat7_2002_40 - lsat7_2002_30) / (lsat7_2002_40+ lsat7_2002_30)"
r.info -r ndvi
r.colors ndvi color=ndvi

# display 2D:
d.mon x0
d.rast.leg ndvi
d.vect streets_wake
# display 3D:
nviz elevation col=ndvi vect=streets_wake
}}}

''Expected results: the NDVI map should be colorized in near natural colors'', see screenshot:

[[Image(nc_ndvi.jpg)]]

=== Raster statistics ===

Univariate statistics:

{{{
r.univar ndvi
}}}

''Expected results: minimum: -0.956522, maximum: 0.978723, mean: 0.190006 etc.''

== Simple vector analysis ==

 * TBD

=== Extracting from vector maps ===

 * extract large streets from "streets_wake"

=== SQL support ===

{{{
g.region vect=schools_wake -p
d.erase

# show all schools in Wake County
d.vect schools_wake col=red icon=basic/circle siz=5

# show a subset of all elementary schools in Raleigh
d.vect schools_wake where="ADDRCITY='Raleigh' and GLEVEL='E'"
}}}

=== Vector statistics ===

Univariate statistics:

{{{
# show available columns
v.info -c precip_30ynormals_3d
v.univar precip_30ynormals_3d col=annual type=point
}}}

''Expected result: mean: 1289.31 etc.''

=== Transfer raster slope to vector segments ===

 * v.split, v.to.db

=== Shortest path routing ===

 * NC bus routes... map "busroutesall"

== Using QGIS' GRASS toolbox ==

Start "qgis" within GRASS shell.

 * Go menu "Plugins, Pluginmanager, activate "GRASS plugin", OK button: a set of new buttons should appear
 * click "Add GRASS raster layer" button, select "elevation" map
 * click "Add GRASS raster layer" button, select "elevation_shade" map
 * click right mouse button in legend on "elevation_shade" map, move transparency to 40%
 * click "Add GRASS vector layer" button, select "roadsmajor" map, select layer "1-line" (level 1 is the topological level), OK