Project file formats

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Project file formats


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TopoLynx topoXplore Map or TopoLynx topoXplore Project file (.EXP)

Default, textual file format of the TopoLynx topoXplore mapping project. For detailed information send an e-mail to


Embedded .DMP(s) in .EXP project file:

TopoLynx Map Pack (.DMP) file can be saved as TopoLynx topoXplore Map (.EXP) file with additional new raster and vector layers. This feature could be a good solution if you have a .DMP as background map that you don't want to modify or it is protected, but want to use new raster and/or vector layers on the map view of the opened .DMP.


To create this embedded .DMP project open a .DMP file and add some existing raster and/or vector layers (or create some new vector layers) to the map view and finally save the entire project into an .EXP file.


OpenGIS KML Map file or Keyhole Markup Language file (.KML):

KML is an XML grammar and file format for modeling and storing geographic features such as points, lines, images, polygons, and models for display in Google Earth, Google Maps and other applications. You can use KML to share places and information with other users of these applications. You can find example KML files on the KML Gallery and Google Earth Community site that describe interesting features and places. For detailed information please see the source of this definition:


OpenGIS KMZ Map file or Zipped Keyhole Markup Language file (.KMZ):

A KMZ file consists of a main KML file and zero or more supporting files that are packaged using a Zip utility into one unit, called an archive. The KMZ file can then be stored and emailed as a single entity. A NetworkLink can fetch a KMZ file from a web server. When the KMZ file is unzipped, the main .kml file and its supporting files are separated into their original formats and directory structure, with their original filenames and extensions. In addition to being an archive format, the Zip format is also compressed, so an archive can include only a single large KML file. Depending on the content of the KML file, this process typically results in 10:1 compression. Your 10 Kbyte KML file can be served with a 1 Kbyte KMZ file. For detailed information please see the source of this definition:


OpenGIS GML Map file or Geography Markup Language Encoding Standard (.GML):

The OpenGIS® Geography Markup Language Encoding Standard (GML) The Geography Markup Language (GML) is an XML grammar for expressing geographical features. GML serves as a modeling language for geographic systems as well as an open interchange format for geographic transactions on the Internet. As with most XML based grammars, there are two parts to the grammar – the schema that describes the document and the instance document that contains the actual data. A GML document is described using a GML Schema. This allows users and developers to describe generic geographic data sets that contain points, lines and polygons. However, the developers of GML envision communities working to define community-specific application schemas that are specialized extensions of GML. Using application schemas, users can refer to roads, highways, and bridges instead of points, lines and polygons. If everyone in a community agrees to use the same schemas they can exchange data easily and be sure that a road is still a road when they view it. Clients and servers with interfaces that implement the OpenGIS® Web Feature Service Interface Standard read and write GML data. GML is also an ISO standard (ISO 19136:2007). See also the GML pages on OGC Network:


ArcPad Map File (*.APM):

An ArcPad map file, or map, stores a list of the map layers for your ArcPad session. A map lists all of your feature layers together with their display settings, including the extent of your map, color, and projection environment.


ArcPad Layer Definition File (*.APL):

Layer definitions are stored in a file associated with a shapefile, with the same filename as the shapefile but with the extension .apl. Layer definition files provide a way of developing customizations that are delivered and loaded with data. Layer definition files may also contain custom symbology exported from ArcGIS Desktop.


Hungarian Digital Base Map (.DAT):

See details about the DAT standard here:,