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WalkLite Mobile GIS: Extend & Symbolize SpatiaLite

WalkLite is a cross-platform mobile GIS based on the Walk schema, designed to represent vector and raster geospatial data efficiently. It provides a user-friendly C++-like script language for customization and a range of GIS products. WalkLite is currently widely used in land use investigation, planning, real estate analysis, and more. This innovative system eliminates the need for data translation between mobile and desktop applications and ensures fast performance with SpatiaLite indexing.

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WalkLite Mobile GIS: Extend & Symbolize SpatiaLite

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  1. WalkLite in Mobile GIS: A Schema to Extend and Symbolize SpatiaLite Dr. X. Chen xianchen@walkinfo.com.cn Walkinfo Tech. Co. Ltd.

  2. Background • WalkGIS • A GISplatform as of 1998 • Complying with OGC standards • Representing vector and raster geospatial data by Walk schema • Providing a C++-like script language for customization • A family of GIS products: WalkSurvey, WalkISurvey, WalkIOffice, WalkFloor, WalkCheck, WalkFU, etc. • Originally designed for land survey in China, now widely used in land use investigation & planning, house property, transportation, population, etc.

  3. Problems in 2013 • Traditional desktop-based system is somehow outdated • No application can be run on mobile devices • End users limited in specific areas • Difficulties encountered when translating various geospatial data

  4. WalkGIS Migration From Windows to Cross-Platform

  5. WalkLite • Walk schema applied in SQLite/SpatiaLite: • Adapting OGR SQLite driver • Defining four meta-data tables: WalkLayers, SymbolFactory, MetaData, and MetaDataDef. • Each WalkLite layer corresponding to three tables: • Features • Symbols • Annotations (text annotations, raster and vector tiles)

  6. WalkLite Layer • WalkLite features: OGR SQLite layer containing • OGC SRS geometry • OGC Feature ID and Walk Feature ID • Createtime: Time of the feature creation • Style ID: Symbol ID for feature style • Feature attributes • SpatiaLite is used for spatial index

  7. WalkLite: Annotations • WalkLite annotations: OGR SQLite layer containing • OGC SRS geometry • Points for the location of text annotations • Polygons for the location of tiles • OGC Feature ID and Walk Annotation ID • Annotation: Text that stores the content of annotation or the file path of tile (Format supported by GDAL) • Style ID: Symbol ID for annotation style • SpatiaLite is used for spatial index

  8. WalkLite: Symbols • WalkLite symbols: regular SQLite table • Styles ID referred by the features and annotations • Style: BLOB data serializing the symbol style • Style name and note

  9. Advantages of WalkLite • Cross-platform: No data translation required between mobile application (data collection) and desktop application (data processing) • One schema for both vector and raster data, also map styling • Comparatively fast by using SpatiaLite index

  10. WalkLite Applications • WalkLite-based mobile GIS App used in a number of Chinese provinces for: • Land investigation • Land use Planning • Cadastral inventory • Real estate analysis • …

  11. Future Work? • Cross-platform SDK • Supporting iOS • WalkLite driver in GDAL/OGR [ODBC-based Walk driver already in GDAL/OGR (version >=1.10.0)] • Further improving and optimizing the performance of WalkLite data

  12. Questions? http://www.walkinfo.com/en.html

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