[Qgis-developer] Student Projects

[Tim Sutton]

Hi

Raster reprojection on the fly would be a fantastic and widely appreciated contribution. The only gsoc project that was accepted was Martin Dobias' performance improvement proposal so I believe there will be no issue with you taking over one of the projects.

We have discussed raster reprojection before today on IRC and I proposed to take the following approach:

- read in the window for the raster to match the current map view (which is resampled to match the display resolution and fetching only the required bands for display) using gdal (as currently implemented in QGIS) but with an additional bit to account for post reprojection rotation.
- reproject by internally using the same api calls that gdal_warp uses
- display

Obviously that doesn't exactly match you interest in implementing code for geodetic transformations but it has the advantage of abstracting / offloading most of the reprojection work to outside of QGIS and us benefiting from improvements and optimisations to gdal over time.

If you follow that logic through you could do some coding in gdal itself to improve the performance of raster reprojection should that prove to be a bottleneck.

Anyway just some thoughts - others may have different ideas on how it should be done.

Regards

Tim
Sent from my mobile phone.

-----Original Message-----
From: Andrew Dalgleish <metafedora at gmail.com>
Date: Fri, 4 Jun 2010 00:43:29 
To: <qgis-developer at lists.osgeo.org>
Subject: [Qgis-developer] Student Projects

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