Collection Format

Collections utilize a simple format so they can easily be used by a variety of tools. GIS-savvy users can use their own tools if they prefer. The directory structure is as follows:

/CollectionName

• parameters.txt: Parameters used to generate the images. Most of these are for internal use only.
• Terralook-Collection.xml: Collection level metadata in XML

/Data

This directory contains multiple shapefiles and text files that describe the footprints of the scenes in the collection.

• aster.shp: a set of boxes that outline the image boundaries for all images in the collection
• asterline.shp: a set of "X"s, one for each box, to help discriminate overlapping footprints for all images in the collection
• asterpoint.shp: a set of points that mark the centerpoint of each footprint  for all images in the collection
   
• image_layer.txt (aster.txt, Landsat--1990.txt, etc.): Tab Delimited text file for each image layer, detailing:
  • Sensor Name
  • Time of acquisition GMT (year, month, day, hour, minutes, seconds)
  • Four Latitude Corner Location (Upper Left, Upper Right, Lower Left, Lower Right)
  • Four Longitude Corner Location (Upper Left, Upper Right, Lower Left, Lower Right)
  • Image file name

• image_layer-poly.shp: a set of boxes that outline the image boundaries for each image layer
• image_layer-line.shp: a set of "X"s, one for each box, to help discriminate overlapping footprints for each image layer
• image_layer-point.shp: a set of points that mark the centerpoint of each footprint for each image layer

Note: each file.shp has a file.dbf and file.shx associated with it.

/Images

This directory contains JPEG images plus their corresponding world files to provide geocoding, and XML metadata.

• image.jpg: The image file
• image.jpgw: The world file
• image.jpg.xml: Image metadata in XML
• image.txt: Image geographic summary

/DEM

This directory may contain topographic data useful for 3-D visualization; otherwise it is left empty. The format is that used by the Global Land Cover Facility (GLCF).