How to Create .tfw and .prj Files with QGIS
The following documentation will cover the process for creating .tfw and .prj files using QGIS. Some pre-contextual information about these two file types are that files with a .tfw extension contain the scale, rotation, and location of an accompanying .tif image; the .prj file extension denotes that the file contains the projected coordinate system, as well a description of the geographic coordinate system.
To be able to follow this tutorial you will need to have QGIS installed on your device and for the case of this request Notepad++ for viewing the contents of the accompanying .json metadata file, once installed please launch QGIS and proceed with the following:
- Launch QGIS and click and drag into the QGIS window the image file for which the .tfw and .prj files shall be generated for
- Upon successfully adding the file the user should notice that the image is rendered at an unknown location, this matter will be addressed within the following steps
- To be able to obtain the desired files the user will need to navigate to Export => Save As... by right-clicking on the inserted file from the previous step
- Within the resulting Save Raster Layer as... dialog window the user will be able to set the projection indicated by the CRS field
- To determine what the projection should be load the .json metadata file within Notepad++ and scroll to the correct section within the file, for SkyWatch products you can locate the desired information with the GeoCodings section of the file make note of the specified projection for our case it is EPSG:4326 also referenced as WGS 84
- Swapping back to QGIS within the Save Raster Layer as... dialog window set the CRS to EPSG:4326 - WGS 84 and scroll down to the Create Options section
- Enable Creation Options by checking off the checkbox and then click on the plus button to add an option, name the option tfw and assign it a value of yes
- To finish click OK the saved file will be automatically inserted into QGIS as a separate layer
- To extract the .prj file search for the Extract Projection tool and left-click on it to bring up the tool's configuration window, select the layer created from the prior steps and check off the 'Create also .prj file'
- Click Run, this will create the .prj file within the source folder
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