WorldFileTool
World File Tool - A metadata management tool for georeferenced images.
See also World file.
Inhaltsverzeichnis
About the WorldFileTool
An interactive tool and a library to georeference images using free and open source software. A World file and the KML format enable GIS programs to read georeferenced images.
Features
- Loads, edits and saves KML with its linked image
- If needed, rotates an image to be north aligned and saves it back
- Supports following graphic file formats: jpg, tiff, png, gif
- Imports and exports a World file with its corresponding image
Usage
Prepare the image. In order to minimize the system strain, keep the image size smaller than 2000 x 2000 pixels.
- Open Google Earth, use "Add Image Overlay", save it and export it as .kml in a local directory.
- Start WorldFileTool, import KML and export it either again KML or as world file.
- Done.
Now you can use the image e.g. in GIS tools like UMN Mapserver (based on the world file) or in IndoorWPS Locator (based on the KML).
How to transform a World file into WGS84?
The WorldFileTool currently can't reproject coordinates, e.g. from local CRS to other CRSs. But Google Earth for example expects image overlays unprojected with lat/long extents.
Use gdalwarp (see GDAL) to convert each world file into an unprojected GeoTiff, and then gdal_translate to produce a jpeg compatible with Google Earth, along with another worldfile listing in lat/lon.
% gdalwarp -s_srs EPSG:21781 -t_srs EPSG:4326 switzerland.jpg switzerland_wgs84.tif % gdal_translate -outsize 13% 13% -of JPEG -co WORLDFILE=YES switzerland_wgs84.tif switzerland_wgs84.jpg
Download
- Binaries: Download-Wiki
- Full deliverable contains Java (inc. Javadoc), Swing and test cases (JUnit).