I am not understanding how ODK collect and Aggregate work. Like once
data collection is done from device how data is sending to aggregate
server and how aggregate servers receive data and storing and storing
in which format. Could anyone explain me the procedure could be really
help?
Many thanks
Currently the Open Data Kit tools are based on JavaRosa XForms, this
will be changing in the future to become more flexible but in the
short run ODK tools use XForms.
ODK Collect is simply a question render of the Xform. Basically you
describe how your survey should look in the Xform and Collect uses
that information to make an interactive survey. Collect provides many
prompts for users to fill in, examples include: free text, integer,
decimal, select-one (radio buttons), select-multi (checkboxes), image,
audio, video, barcode, and GPS location.
ODK Aggregate provides a server repository to manage collected data
and provide standard interfaces to extract data (e.g., spreadsheets,
queries, etc.). Aggregate supports returning data in standard formats
(e.g. CSV, KML).. Aggregate takes your Xform and automatically builds
a database based on the JavaRosa Xform. Aggregate stores the xform
submissions (normally submitted from collect) by taking the xform
submission and converting the submission into standard database table
rows. Users can then ask for the data in the database to be exported
in a variety of way.
For more details I suggest looking at the ODK ICTD2010 papers that
describes the system.
http://opendatakit.org/wp-content/uploads/2010/10/ODK-Paper-ICTD-2010.pdf
Waylon