A. Khandelwal, K. S. Rajan

Research output: Contribution to journalConference articlepeer-review


Geography markup language (GML) is an XML specification for expressing geographical features. Defined by Open Geospatial Consortium (OGC), it is widely used for storage and transmission of maps over the Internet. XML schemas provide the convenience to define custom features profiles in GML for specific needs as seen in widely popular cityGML, simple features profile, coverage, etc. Simple features profile (SFP) is a simpler subset of GML profile with support for point, line and polygon geometries. SFP has been constructed to make sure it covers most commonly used GML geometries. Web Feature Service (WFS) serves query results in SFP by default. But it falls short of being an ideal choice due to its high verbosity and size-heavy nature, which provides immense scope for compression. GMZ is a lossless compression model developed to work for SFP compliant GML files. Our experiments indicate GMZ achieves reasonably good compression ratios and can be useful in WebGIS based applications.

Original languageEnglish (US)
Pages (from-to)9-13
Number of pages5
JournalISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Issue number2W4
StatePublished - Sep 12 2017
EventISPRS Geospatial Week 2017 - Wuhan, China
Duration: Sep 18 2017Sep 22 2017

Bibliographical note

Publisher Copyright:
© Authors 2017.


  • GIS
  • GML
  • Lossless compression
  • Simple features profile
  • WFS


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