PhoTopoL Atlas

Basic features
Basic features
PhoTopoL Atlas
The Workflow

PhoTopoL Atlas - digital photogrammetric workstation

is the software application, which brings new quality for digital photogrammetric production. That was created in co-operation of two Czech companies TopoL Software Ltd. and ATLAS Ltd. It is built on the 10 year experience with development and use of digital photogrammetric system PhoTopoL, digital elevation model ATLAS DMT and system TopoL GIS.

Internal and external orientations

  • Automatic interior orientation
  • AT points measurement with correlation in mono or stereo
  • Aerotriangulation with AeroSys for Windows
  • Import of orientations from Z/I Imagestation, Erdas, Match AT, DiAP, Pat-B, Digi, any ASCII file

Rectification and mosaicing

  • Import and export into different file formats
  • Orthoimage generation
  • Full-featured geometric transformations (similarity, affinity, colinearity, polynomial quadratic and cubic) of raster data
  • Mosaicing with automatic image balancing along stitch line


  • Efficient three-dimensional data collection
  • Continuous roamimg and zooming of stereo images
  • Superimposition of vector data over the stereo images
  • Extensive care focused on topology and support for topographic structures of vector data
  • Undo
  • Solving of topologic relations in real-time while data are digitised
  • Class attribute (local database structure) definition for every class of vector objects separately in each file
  • Fully functional link to external databases with powerful support for one-to-many relations
  • Database browser, easy-to-use query tool, attribute computations
  • Various object and layer combinations
  • Creation of thematic views and special maps through colour and style symbol definition
  • Import and export: DXF, DGN, MapInfo, ArcView ShapeFile, ArcInfo Generate Format

Technology for automatic contour lines generation of middle scale maps

PhoTopoL Atlas enables nearly fully automatic production of high quality DTM based on the automatic correlation. The technology has got several steps:

  • Pre-processing
    scanning of aerial photographs in desired resolution, project definition, definition of models, aerial triangulation with module AeroSys.
  • Automatic correlation
    automatic points extraction by the method of image correspondence and following creation of TIN DTM.
  • Editing of DTM
    Elimination of major errors using interactive DTM editor when contour lines can be displayed both in mono and stereo screen and are immediately recalculated and redisplayed after the change. The system offers full range of functions for interactive editing (deleting, moving and adding points, levelling, deleting or adding elevation to points in defined polygons, adding edges of all types, etc.).
  • Correction of altitudes
    special sophisticated module which enables to eliminate automatically errors of correlation and to smooth final DTM. This DTM can be further analysed.
  • Outputs
    Such a high quality DTM can be used for automatic contour lines generation, creation of orthoimages or other 2D or 3D outputs for geographical information systems.

This technology reduces the production expenses of high quality DTM. It gives very fast, low cost and high quality results especially for maps of middle and small scale (1:10 000, 1:25 000, 1:50 000).

The final DTM can be further processed in other modules of ATLAS DMT system. These modules enable other calculations and analyses of DTM:

  • combination of DTM with other data of various source (surveying, digitised contour lines)
  • comparing, adding and subtracting of two surfaces
  • 3D views optionally in perspective or axonometry with texture
  • computation of longitudinal and cross sections from polygon data. Positioning, description, dimensions, and editing of the sections using different horizontal and vertical scales
  • fast and accurate computation of volumes between two surfaces
  • special modules for road, pipeline or watercourse designers
  • hydrological analysis, erosion soil loss computation, flooded area analysis
  • visibility and signal propagation calculation for profile or whole surface

2000 - 2008 © TopoL Software Ltd. & Atlas Ltd.