Touch GIS Currently Supports the following file types for import and export.
Importing
Shapefiles
KML
KMZ
GeoJSON
GPX
World File
GeoTIFF
.TGIS (proprietary filetype for lossless backup and device-to-device transfer)
An important note on TGIS files
This proprietary format is very useful for backing up projects or sharing projects from one device to another. Currently, however, TGIS files cannot be combined with another project during import.
Sharing
Shapefiles
Shapefiles with Images
KML
KMZ
GeoJSON
GPX
CSV
.TGIS (proprietary filetype for lossless backup and device-to-device transfer)