GvSIG GSoC 2014 Ideas

Use this page to jot down and develop any good idea for the Google Summer of Code 2014 program with gvSIG project. Please, use the gvSIG mailing lists for discussion and check 2013, 2012, 2011, 2010, 2009 ideas pages for examples or reference.

Add OpenCL support with Aparapi for Geoprocessing in gvSIG desktop

• Product: gvSIG Desktop
• Possible mentor: Cèsar Ordiñana
• Possible student: Paula Navarro

Aparapi is a library which allows Java developers to take advantage of the compute power of GPU and APU devices by executing data parallel code fragments on the GPU rather than being confined to the local CPU. It does this by converting Java bytecode to OpenCL at runtime and executing on the GPU, if for any reason Aparapi can't execute on the GPU it will execute in a Java thread pool.

Large amounts of geographic data-processing might be involved in the execution of a geoprocess. And many geoprocessing algorithms are suitable to be converted to parallel code, allowing for much better execution performance and capacity.

The objective would be to integrate the Aparapi library in gvSIG, so it might be used in the development of new parallel geoprocessing algorithms which take advantage of current GPUs. Also some geoprocesses would have to be developed or converted to use the Aparapi library to check the benefits and the proper operation of the idea.

Extend Raster Support in Scripting Framework in gvSIG

• Product: gvSIG Desktop
• Possible mentor:
• Possible student: Sandeep Kumar

1. Introduction

gvSIG Scripting Framework is a small environment for development and execution of scripts that interact with the application.These scripts allow us to automate small tasks or add some functionality that we need and that we can implement. This feature helps the developers to test their implementations locally with much less effort.

2. Background

At this moment, using Scripting Framework one can load raster layer and perform some filtering operations. This was implemented as part of GSoC 2013 idea Add Raster Format to Scripting in gvSIG

3. Idea

This idea concentrates on extending the capabilities of Jython Scripting in gvSIG Desktop. A lot of Raster functions like histogram analysis, flow direction analysis, geoprocessing etc., which stand as a major advantage of using Raster data should be implemented in Scripting Framework.

Filtering of raster images is one of the key feature of image analysis. As of now, the filtering operations consume lots of time even on small images. This can be optimized by making use of the already implemented gvSIG kernels from Java.

As of now, one can load .tiff files using Scripting Framework. This should be extended such that one can load .ecw, .jp2 files. Loading a layer in a tiled way, loading WMS and WCS layers, getting the ROI of a layer as a vector layer etc., should be implemented.

Port Network Analysis Extension to gvSIG 2.x branch

• Product: gvSIG Desktop
• Possible mentor: Francisco José Peñarrubia
• Possible students: David Pinheiro, Vicente Caballero, Sandeep Kumar, Dragos Dragomir

Port gvSIG Network Analysis Extension from 1.12 release to the new 2.x branch.

Network Analysis extension allows to calculate routes, service areas, origin - destination matrices, connectivity analysis... It supports speeds for several vehicles, barriers, turn costs, etc.

Improvement: Use GraphHopper [1] library to use new algorithm Contraction Hierarchies (much faster) when calculating routes.

Skills needed: Java, Eclipse development. Some notions about Maven would be interesting.

SHP format support for gvSIG Mini

• Product: gvSIG Mini
• Possible mentor: Daniel Gastón
• Possible student: Miguel Sotelo

1. Introduction

By integrating the OGR library into gvSIG Mini we could get access several vector formats including the widespread SHP format so much demanded by the gvSIG Mini users. OGR offers us the perfect platform to implement demanding format transformations and the corresponding file format outputs as many desktop GIS application already do.

2. Background

At this moment, gvSIG gets access to a reduced list of file formats and transformations.

3. The idea

The main idea behind this project is about integrating the OGR library into gvSIG Mini. The OGR library provides several capabilities for simple features vector data; however it should be mentioned that OGR is also part of the GDAL source tree, so that by integrating OGR we do integrate GDAL as well, getting access to GDAL raster capabilities(for future developments). This proposal improves the application interoperability, and in general terms, the supported range of geoprocesses and transformations.

Once the solution is adapted and compiled, we would proceed to adapt and connect the full OGR data model with the data model gvSIG works with and provide full support to the SHP format. The implementation is intended to be done in a way future formats supports are easily developed.

Add XLS file format support to gvSIG Desktop 2.x (read only)

• Product: gvSIG Desktop
• Possible mentor: Joaquín del Cerro
• Possible student: Manuel Madrid

The idea is about adding to gvSIG Desktop 2.x a new data provider for reading XLS files (Microsoft Excel spreadsheets). Taking into account that the latests versions of Microsoft Excel don't support DBF file format (the most common table format used in gvSIG) this feature would facilitate the data transfer from MS Excel to gvSIG.

Geoprocesses Access from the Scripting Framework in gvSIG Desktop 2.x

• Product: gvSIG Desktop
• Possible mentor: Joaquín del Cerro
• Possible student: Óscar Martínez Olmos

Since the last version, you can write your own Python scripts inside gvSIG 2.x using the new Scripting Framework. Now, when you create your script, you have a lot of functions available, but you don't have access to the Geoprocesses that already exist in gvSIG.

The idea is extend the capabilities of this module and create the link between Scripting and Geoprocesses for have access to powerfool tools, who can be even more usefull when you use it inside your own script. ArcPy (ArcGIS) have a similar funcion, with gvsig, you will call one geoprocess in your script with a code similar like this:

Gvsig_Disolve("layer1.shp","AREA",0,0,fields, "C:/gvsig/disolve.shp")

Also, if a have time, i would like to incorporate the option to insert scripts inside the gvSIG Model Builder, you could create greater tasks.

Idea template

• Product: gvSIG Desktop/gvSIG Mini
• Possible mentor: if applicable
• Possible student: if applicable

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