Dimap 1.1.3 SPOTView Profile
<Data_Access>Dimap_Generic 1.0

Access path(s) to the real data file(s)

Description :

Data_Access delivers the paths to the real data files. There may be one or several attached files according to the DATA_FILE_ORGANISATION, SUPER_TILE_SIZE and PYRAMID_DEPTH used. The simplest case (and the most common) is with a single Data_File attached (for example a single GeoTiff file).

However, there may be some more complicated Data_Access organisation. For example, if DATA_FILE_ORGANISATION is 'BAND_SEPARATE' then there will be as many Data_File as number of spectral bands of the image (one per band).

As well, when dealing with very large images, it is possible to split an image into separate super-tiles (we use the term of 'super-tiles' in order not to get confused with naturally tiled file formats like Tiff 6.0 or FlashPix). In this case the 'virtual image' is split into square super-tiles, each being a single small file. Please note that all the different Data_Files are of the same file format. Some of the individual super-tiles could not be present, allowing none rectangular virtual images.

On the top of super-tiling, one can define multiple resolution datasets. This construction allows to represent the same dataset at different resolutions. This is applicable to both raster or vector datasets. All the pyramid levels do not need to be present. The scale ratio between two succecive pyramid layer is 1/2.

You can refer to the Dimap Reference Documentation (Dimap in use chapter) for detailed explanations on super-tiling and image pyramids.

 

Example :
 
<Data_Access>
   <DATA_FILE_FORMAT>GEOTIFF</DATA_FILE_FORMAT>
   <Data_File>
      <DATA_FILE_PATH href="Alfaro_Ortho.TIF/>
   </Data_File>
</Data_Access>

or

<Data_Access>
   <DATA_FILE_FORMAT>OTHER</DATA_FILE_FORMAT>
   <DATA_FILE_FORMAT_DESC>Special Telecom DEM format</DATA_FILE_FORMAT_DESC>
   <Data_File>
      ...
   </Data_File>
</Data_Access>

or

<Data_Access>
   <DATA_FILE_FORMAT>RAW</DATA_FILE_FORMAT>
   <DATA_FILE_ORGANISATION>BAND_SEPARATE</DATA_FILE_ORGANISATION>
   <Data_File>
     <BAND_INDEX>1</BAND_INDEX>
      ...
   </Data_File>
   <Data_File>
     <BAND_INDEX>2</BAND_INDEX>
      ...
   </Data_File>
   <Data_File>
     <BAND_INDEX>3</BAND_INDEX>
      ...
   </Data_File>
</Data_Access>

or

<Data_Access>
   <SUPER_TILE_SIZE>512</SUPER_TILE_SIZE>
   <PYRAMID_DEPTH>4</PYRAMID_DEPTH>
   <DATA_FILE_FORMAT>TIF</DATA_FILE_FORMAT>
   <Data_File>
      ...
   </Data_File>
   <Data_File>
      ...
   </Data_File>
   ...
</Data_Access>
Datatype : t_Data_Access

Ordered list of :

Possible parent(s)