FEFLOW 8.0 Documentation
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WGEO

The growing number of tasks involving the recording, administration, and analysis of digital geographical data is reflected in an increasing use of geographical information systems in the commercial and government domains. Where digital geographic data are not yet available for a given area, they are typically obtained by scanning existing analog data. Any such data, possibly from differing coordinate systems, must be referenced to a world coordinate system. Changing coordinates or transforming data into a uniform coordinate system can easily become a very time-consuming task.

WGEO, the DHI-WASY georeferencing software, efficiently addresses this issue. The output of WGEO can be used by diverse GIS and by FEFLOW. WGEO is available in 32-bit and 64-bit versions. Other than available memory and a format-induced single-image limit of 4 GB, there are virtually no restrictions regarding image size in the 64-bit version. The 3-GB address-space extension for 32 bit systems is supported by WGEO.

With each FEFLOW license, on Windows systems a license is automatically installed for WGEO Basis (32-bit) and the 7-parameter Helmert transformation. WGEO can be started from the Standard toolbar within FEFLOW, via the desktop icon or from the Startup menu.

On Linux systems, a tool named FEMAP covers georeferencing functionality.

Functionality of WGEO

WGEO Basis

  • Georeferencing of image data (File types)

  • Optionally, georeferencing using affine or trapezoidal transformation (conversion of pixels) or Registration only (creating of world files)

  • Assigning of world coordinates by keyboard, import functions, or georeferenced reference maps

  • Spatially referenced deleting and cropping using rectangular     or arbitrary (polygon) selections

  • Combining of georeferenced images (copy and paste)

  • File-controlled spatially referenced deleting and cropping

  • Batch mode: Tasks can be defined, queued, and executed at a later time (recursive loading is supported)

  • Transformation of attributes: For shape files containing coordinates in the attribute tables, the respective columns can be specified for coordinate transformation

  • Data file transformation: Coordinate-value pairs in text- or dBase files can be converted by the WGEO® 6.0 transformation routines

  • Single-point transformation: Individual points entered by hand can also be converted

  • Snapping: When using vector maps or coordinate tables as reference maps, snapping to lines, and/or points can be activated for obtaining exact coordinate values.

  • Listing image information: List dimensions, color depth, georeferencing and more for multiple selected images

  • Loading and Editing of Microsoft- and PaintShop Pro color palettes

  • Interpretation of ASCII-files (value triples) as point, line, or polygon geometry. The set of points will be graphically displayed and can be used as reference map.

  • A COM interface is provided for integration of user-specified data formats

  • Additional functions (also in batch mode): Invert, Changing color depth, Rotation in 90° increments, Changing compression and geotransformation format. These functions all preserve the georeferencing.

  • Image editing: Brightness/contrast/saturation , smoothing, color palettes

  • DXF-Layer List

  • Data inspector for quick display of attribute data

  • Format conversion of attribute data (dBase, ASCII)

  • Unicode support

WGEO plus

In addition to all the functions of the Basis mode, Plus mode provides further powerful functionality for georeferencing and geo-imaging:

  • Georeferencing of vector data (File types)

  • Re-sampling (Change image size)

  • Color images can be transparently overlaid over georeferenced background maps to be georeferenced via link vectors. The color palette of the background map can be dynamically adjusted (Overlay mode). Images as well as ESRI-shape and DXF files can be used as background maps.

  • Generating of image catalogues and of dBase tables containing names and extents of multiple images

  • Generating of sheet-line catalogues (ESRI-shape file containing the individual enclosures of multiple images). The dBase file can be used as image catalogue.

  • Maps can be combined and/or tiled based on a used-specified pattern. (Mosaic function)

  • Color palettes can be optimized over multiple images (especially useful with image catalogues).

  • Searching in attribute tables and auto-zooming to the pertaining locations (also for background maps).

  • Multiprocessor mode permits fast execution of complex tasks on the respective hardware.

  • 7-parameter Helmert coordinate transformation (can also be purchased separately for WGEO Basis).

WGEO Professional

This module is optimized for georeferencing of land-register maps.

  • Shifting, rotating and scaling of transparent images over background maps

  • Georeferencing by setting of link vectors in overlay mode with immediate graphical feedback

  • Leveling of margins with previous images in overlay mode Protocol-based working

  • Trimming and showing/hiding of margins

  • Loading of multiple maps

  • Loading of multiple shape themes

  • Loading of multiple background maps by clicking in sheet-line catalogue

  • Optimal color adjustment of background map

  • Inserting of working maps into background map

Topographic-map mode

This module is optimized for georeferencing large numbers of topographical maps. It is only available as a network license.

  • Graphical file selection via sheet-line catalogue

  • Semi-automatic georeferencing via sheet-line catalogue – world coordinates are automatically snapped  to the corners of the sheet-line catalog 

  • Automatic margin trimming

  • Batch mode

  • Creating georeferencing projects with protocol function

 
 
 
 
 

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