libossim-dev 1.7.21-4 / usr / include / ossim / imaging / ossimUsgsDemTileSource.h

//*******************************************************************
// Copyright (C) 2002 ImageLinks Inc. 
//
// License:  See top level LICENSE.txt file.
//
// Author: David Burken
//
// Description:
//
// Contains class declaration of ossimUsgsDemTileSource.
// The ossimUsgsDemTileSource class is derived from ossimImageHandler and
// is intended to be an image handler for USGS dem files.
//
//********************************************************************
// $Id: ossimUsgsDemTileSource.h 9094 2006-06-13 19:12:40Z dburken $

#ifndef ossimUsgsDemTileSource_HEADER
#define ossimUsgsDemTileSource_HEADER

  // #include <fstream>
#include <ossim/imaging/ossimImageHandler.h>

class ossimImageData;
class ossimDemGrid;

class OSSIM_DLL ossimUsgsDemTileSource : public ossimImageHandler
{
public:
      
   ossimUsgsDemTileSource();
   
   virtual ~ossimUsgsDemTileSource();

   virtual ossimString getShortName() const;
   virtual ossimString getLongName()  const;
   virtual ossimString className()    const;

   /**
    *  Returns true if the "theImageFile can be opened.
    *
    *  If the extension is not equal to ".dem" this will attempt to look for
    *  an ".omd" file with the keyword pair "dem_type:  usgs_dem" in it.
    *
    *  Optionally users can change the scalar type from signed 16 bit to
    *  float with the keyword pair "scalar_type: ossim_float32"
    */
   virtual bool open();

   virtual ossimRefPtr<ossimImageData> getTile(const  ossimIrect& tile_rect,
                                               ossim_uint32 resLevel=0);
   
   /**
    *  Returns the number of bands in the image.
    *  Satisfies pure virtual requirement from ImageHandler class.
    */
   virtual ossim_uint32 getNumberOfInputBands()  const;
   virtual ossim_uint32 getNumberOfOutputBands() const;
   
   /**
    *  Returns the number of lines in the image.
    *  Satisfies pure virtual requirement from ImageHandler class.
    */
   virtual ossim_uint32 getNumberOfLines(ossim_uint32 reduced_res_level = 0) const;
   
   /**
    *  Returns the number of samples in the image.  
    *  Satisfies pure virtual requirement from ImageHandler class.
    */
   virtual ossim_uint32 getNumberOfSamples(ossim_uint32 reduced_res_level = 0) const;

   virtual double getNullPixelValue(ossim_uint32 band=0)const;
   virtual double getMinPixelValue(ossim_uint32 band=0)const;
   virtual double getMaxPixelValue(ossim_uint32 band=0)const;

   /**
    * Returns the zero based image rectangle for the reduced resolution data
    * set (rrds) passed in.  Note that rrds 0 is the highest resolution rrds.
    */
   virtual ossimIrect getImageRectangle(ossim_uint32 reduced_res_level = 0) const;
   
   /**
    * Method to save the state of an object to a keyword list.
    * Return true if ok or false on error.
    */
   virtual bool saveState(ossimKeywordlist& kwl,
                          const char* prefix=0)const;
   
   /**
    * Method to the load (recreate) the state of an object from a keyword
    * list.  Return true if ok or false on error.
    *
    * Keywords picked up by this method:
    * dem_type: usgs_dem
    * scalar_type: ossim_sint16 (default)
    * or
    * scalar_type: ossim_float32
    */
   virtual bool loadState(const ossimKeywordlist& kwl,
                          const char* prefix=0);
   
   /**
    *  Populates the keyword list with image geometry information.  This
    *  method is used to relay projection/model information to users.
    *  Returns true if geometry info is present, false if not.
    */
   virtual bool getImageGeometry(ossimKeywordlist& kwl,
                                 const char* prefix=0);
   
   /**
    * Returns the output pixel type of the tile source.
    */
   virtual ossimScalarType getOutputScalarType() const;

   /**
    * Returns the width of the output tile.
    */
   virtual ossim_uint32 getTileWidth() const;

   /**
    * Returns the height of the output tile.
    */
   virtual ossim_uint32 getTileHeight() const;

   /**
    * Returns the tile width of the image or 0 if the image is not tiled.
    * Note: this is not the same as the ossimImageSource::getTileWidth which
    * returns the output tile width which can be different than the internal
    * image tile width on disk.
    */
   virtual ossim_uint32 getImageTileWidth() const;

   /**
    * Returns the tile width of the image or 0 if the image is not tiled.
    * Note: this is not the same as the ossimImageSource::getTileWidth which
    * returns the output tile width which can be different than the internal
    * image tile width on disk.
    */
   virtual ossim_uint32 getImageTileHeight() const;   

   virtual bool isOpen()const;
   
private:
   // Disallow operator= and copy constrution...
   const ossimUsgsDemTileSource& operator=(const  ossimUsgsDemTileSource& rhs);
   ossimUsgsDemTileSource(const ossimUsgsDemTileSource&);
   
   /**
    *  Returns true on success, false on error.
    */
   template <class T> bool fillBuffer(T, // dummy template variable
                                      const ossimIrect& tile_rect,
                                      const ossimIrect& clip_rect);

   void gatherStatistics();

   ossimDemGrid*               theDem;
   ossimRefPtr<ossimImageData> theTile;
   ossim_float64               theNullValue;
   ossim_float64               theMinHeight;
   ossim_float64               theMaxHeight;
   bool                        theFeetFlag;  // elevation units = feet
   bool                        theIsDemFlag;

   /**
    * This can be either OSSIM_SINT16 or OSSIM_FLOAT32.  Default = OSSIM_SINT16
    * Can be changed via ".omd" file keyword:
    */
   ossimScalarType             theScalarType;
   
TYPE_DATA
};

#endif  // #ifndef ossimUsgsDemTileSource_HEADER