Raster

WorldFile explained (or at least we tried!)

There is a lot of confusion around about what world file represents therefore we thought it would have been nice to put together a couple of clarifications.The World FileWorld File is a de-facto standard from early days of ESRI desktop GIS applications. Originally it was composed by at least two files, a raster file, let' say a file.tiff,  and another file (most part of the times called file.wld)  that contains numbers that define the affine transformation between the image and the target spatial reference system. This implicitly means that we are talking about georectified raster data. This wld file is what...

More

[FIX] GeoTools and GeoServer ( < 2.1.4) not able to load raster plugins with latest Tomcat

The ProblemLately some GeoTools and GeoServer ( < 2.1.4) users reported issues related to GeoTools raster plugins not being properly loaded in Tomcat 6.0.24 and above.Typical scenario is as follows: Geoserver deployed in Tomcat 6.0.26 along with the GDAL ImageIO-Ext extensions. The available GDAL formats properly appear in the Store user interface but, when trying to configure a new coverage, an error is reported and the logs shows the following messageCaused by: java.lang.IllegalArgumentException: Incorrect input type! at javax.imageio.ImageReader.setInput(ImageReader.java:290) at it.geosolutions.imageio.gdalframework.GDALImageReader.setInput(GDALImageReader.java:838)The causeBehind the scenes this is what is happening:In latest Tomcat releases a huge amount of work has been put in...

More

Behind the curtains: GeoServer/GeoTools ImageMosaic footprints management

Lately at GeoSolutions we have been working on improving the ImageMosaic capabilities as far as large mosaic with void areas are concerned. Often we need to mosaic several datasets which partially overlap which also contain areas where no data is defined (void areas); an example could be a set of satellite acquisitions with some missing areas (see pictures below).In the example above, the red borders represent the overlapping portions of the mosaic datasets; such portions partially overlap with other areas containing useful data for other datasets. A mosaic of these 2 datasets might produce a rendering like the one here...

More