DOC: review vertexcomponentanalysis app

Modules/Applications/AppHyperspectral/app/otbVertexComponentAnalysis.cxx

@@ -50,16 +50,28 @@ private:
   void DoInit() ITK_OVERRIDE
   {
     SetName("VertexComponentAnalysis");
-    SetDescription("Find endmembers in hyperspectral images with Vertex Component Analysis");
+    SetDescription("Given a set of mixed spectral vectors, estimate"
+    "reference subtances also known as endmembers using the Vertex"
+    "Component Analysis algorithm.");
 
     // Documentation
     SetDocName("Vertex Component Analysis");
-    SetDocLongDescription("Applies the Vertex Component Analysis to an hyperspectral image to extract endmembers");
+    SetDocLongDescription("Apply the Vertex Component Analysis [1] to"
+    "an hyperspectral image to extract endmembers. Given a set of mixed"
+    "spectral vectors (multispectral or hyperspectral), the application"
+    "estimates the spectral signature of reference subtances also known"
+    "as endmembers.");
     SetDocLimitations("None");
     SetDocAuthors("OTB-Team");
-    SetDocSeeAlso(" ");
-
-	AddDocTag("Miscellaneous");
+    SetDocSeeAlso("[1] J. M. P. Nascimento and J. M. B. Dias, Vertex"
+    "component analysis: a fast algorithm to unmix hyperspectral data,"
+    "in IEEE Transactions on Geoscience and Remote Sensing, vol. 43,"
+    "no. 4, pp. 898-910, April 2005.J. M. P. Nascimento and"
+    "J. M. B. Dias, Vertex component analysis: a fast algorithm to"
+    "unmix hyperspectral data, in IEEE Transactions on Geoscience and"
+    "Remote Sensing, vol. 43, no. 4, pp. 898-910, April 2005.");
+
+    AddDocTag("Miscellaneous");
     AddDocTag(Tags::Hyperspectral);
     AddDocTag(Tags::DimensionReduction);
 
@@ -67,12 +79,15 @@ private:
     SetParameterDescription("in","Input hyperspectral data cube");
 
     AddParameter(ParameterType_Int, "ne", "Number of endmembers");
-    SetParameterDescription("ne","The number of endmembers to extract from the data cube");
+    SetParameterDescription("ne","The number of endmembers to extract from the hyperspectral image.");
     SetParameterInt("ne",1, false);
     MandatoryOn("ne");
 
     AddParameter(ParameterType_OutputImage, "outendm", "Output Endmembers");
-    SetParameterDescription("outendm","The endmebers, stored in a one-line multi-spectral image, each pixel representing an endmember");
+    SetParameterDescription("outendm","Endmembers, stored in a"
+    "one-line multi-spectral image.Each pixel corresponds to one"
+    "endmembers and each band values corresponds to the spectral"
+    "signature of the corresponding endmember.");
     MandatoryOn("outendm");
 
     AddRANDParameter();