8 Rasterlite

gravitystorm edited this page 2012-08-21 04:04:03 -07:00

Table of Contents

• Installation
• Parameters
• Styling
• Usage
• Python
• XML
• C++
• Further References

This plugin supports reading georaster files embedded into sqlite databases using RasterLite of the excellent Spatialite project.

The use of rasterlite allows to use jpeg / wavelets compressed rasters in sqlite files (even 4GB databases !) quite fast than plain geotiff, thanks to the use of the R-Tree and Pyramid features in sqlite.

• Note: You must use at least the development version [1.1b] (https://www.gaia-gis.it/fossil/librasterlite/index) to compile the input plugin.

For other plugins see: PluginArchitecture

Installation

TODO

Parameters

parameter	value	description	default
file	string	sqlite database file path
base	string	optional base path where to search for the sqlite database file
table	string	table in database which contains raster data

Styling

To style a layer use the RasterSymbolizer

Usage

Python

TODO

XML

    <!-- NOTE: must be in the same SRS as your map-->
    <Layer name="Raster">
        <StyleName>raster</StyleName>
        <Datasource>
            <Parameter name="type">rasterlite</Parameter>
            <Parameter name="file">/path/to/my/rasterlite/database.sqlite</Parameter>
            <Parameter name="table">my_raster</Parameter>
        </Datasource>
    </Layer>

C++

Plugin datasource initialization example code can be found on PluginArchitecture.

A Raster datasource may be created as follows:

    {
        parameters p;
        p["type"]="rasterlite";
        p["file"]="/path/to/my/rasterlite/database.sqlite";
        p["table"]=my_raster;
    
        set_datasource(datasource_cache::instance()->create(p));
    
        Layer lyr("Raster");
        lyr.add_style("raster");
        m.addLayer(lyr);
    }

Further References

• Rasterlite How-To