GSoC 2018 NASA-ESA WebWorldWind Support for WFS Format

Project Description
OGC Web Feature Service allows a client to retrieve and update geospatial data encoded in Geography Markup Language (GML) from multiple Web Feature Services. WFS Server supports various operations like Get Feature, Describe Feature Type, Lock feature and Transaction Operations.

Transaction operation is an optional operation which allows the feature instances and their properties to be updated or deleted and it can also be used to insert new features. Each transaction will consist of zero or more Insert, Update, and Delete elements, with each transaction element performed in order. The Transaction operation request will contain transformation operations like create, Update and Delete and web accessible feature instances on which operations need to be applied. When the transaction will complete, a web feature service will generate an XML response document indicating the completion status of the transaction.

In this project, OGC format Web Feature Service [WFS] client will be created which will support Transaction Operation on features by using WFS standard request and response. The goal is to parse Get capability request and to identify the capability of the server. And the proposed client will support Creation, Updation and deletion of the features instance using the shapes drawn on the Globe.

The state of Project before GSoC
Creation, Updating and deleting of the Features using the shapes drawn on the Globe is not supported by NASA-ESA WebWorldWind

Benefits to the community
Creation, Updation and deletion of the features by drawing shapes on the Globe will help a user to maintain web features stored on the server. The Functionality of current client will increase.

Project Deliverables
Repository Link: https://github.com/GarimaNatani/WebWorldWind
 * Deliver Classes that perform WFS (Transaction Operator) using the shapes drawn on the Globe.
 * GUI code to display Updated features.
 * Test Suits that perform testing with various data set.
 * Complete documentation of Code.

Project Outcome

 * Contributed to open source community by supporting web feature service and its operations
 * Developed code to display vector features on 3D Globe, and to create Open Geospatial Consortium (OGC) standardized XML request of 'Get Feature' and 'Transaction' operation of web feature service
 * Increased the facility of data visualization and interaction with spatial data by creating standard web feature service XML response parser in JavaScript
 * Developed automatic tests in Karma framework to test newly created functionality