Changes between Version 25 and Version 26 of Grass7/TemporalGISAlgebra

Timestamp:

Oct 20, 2014, 12:46:20 PM (10 years ago)

Author:

mastho

Comment:

--

Grass7/TemporalGISAlgebra

@@ -167 +167 @@
 This is very important, so we do not need to specify a global time reference (a space time dataset) for temporal processing.
 
+==== Single map with temporal extent ====
+
+The temporal algebra can also handle single maps with time stamps in the tmap function.
+  tmap()
+For example:
+{{{
+ C = A {:,during} tmap(event)
+}}}
+This statement select all maps from space time data set A that are during the temporal extent of single map 'event'
+
 == Temporal Vector Algebra ==
 
@@ -218 +228 @@
 temporal operators and arithmetic operators.
 
+==== Arithmetic operators ====
+{{{
+Symbol  Description
+
+  +    Addition
+  -    Substraction
+  *    Multiplication
+  /    Division
+  %    Modulus
+}}}
+
+==== Arithmetic function ====
+{{{
+Symbol
+
+  exp
+  log
+  sqrt
+  abs
+  cos
+  acos
+  sin   
+  asin
+  tan
+  double
+  float  
+  int
+  isnull
+  isntnull
+  null    
+  exist  
+}}}
+
 Examples:
 Create the sum of all maps from STRDS A and B that have equal time stamps and store the new maps in STRDS C:
@@ -254 +297 @@
 }}}
 
-All supported operators and functions are documented below.
-
+
+==== Single raster map function ====
+
+The temporal raster algebra feature also a function to integrate single raster maps without time stamps into the expressions.
+  map()
+For example:
+{{{
+ C = A * map(constant_value)
+}}}
+This statement multiply all raster maps from space time raster data set A with the raster map 'constant_value'
 
 = Overview of all supported spatio-temporal operators and functions =