Changes between Version 7 and Version 8 of HowToTestGrass6

Timestamp:

Apr 20, 2008, 5:04:14 AM (16 years ago)

Author:

neteler

Comment:

Normalized Differences Vegetation Index (NDVI) from LANDSAT-TM7

HowToTestGrass6

@@ -119 +119 @@
 }}}
 
-Tests: navigate with the puck, interrogate map etc. (ADD MORE)
+Tests: navigate with the puck, interrogate map, etc. (ADD MORE)
 
 ''Expected result: should not crash at all but show maps as expected''
@@ -129 +129 @@
 === Raster algebra ===
 
- * r.mapcalc
+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''
 
 === Raster statistics ===
@@ -142 +162 @@
 
  * 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 ===