Raster formats devoid of georeference information, e.g. a TIFF format file lacking Geotiff tags, require additional configuration for Spatial Location Scan operations to produce a desired outcome.
This wiki will outline considerations for success in this scenario.
Initial spatial location scan result:
Here we scan a ProjectWise folder containing 3 *.TIF files, and their 3 corresponding *.TFW world files.
As the world file format does not inherently contain a coordinate system definition, Extract Location Only is the prescribed extraction option, with the desired value supplied by the operator.
Note that the Available coordinate systems are defined via the ProjectWise Administrator, by users defined as a Spatial Administrator.
The de facto result summary is as expected, with spatial location information applied to the 3 *.TIF files:
Examining the Spatial properties of a processed (*.TIF) document reveals the tell-tale signature of an image processed without inherent or associated spatial location information:
Lower Left:
X = 0.0
Upper Right:
Y = 0.0
These de facto results are correct, reflecting the extents of the image (5000 pixels at 1m/px) from the upper left pixel anchored at 0,0.
The results are not as desired however, as the spatial information from the world file counterpart has not been considered.
Consideration of the world file requires modification of the associated *.TFW’s application attribute.
ProjectWise File Association: Images
Out-of-the-box, ProjectWise includes an Images Program Association definition.
As seen via ProjectWise Explorer, Tools > Associations…
This definition is associated with common raster formats:
As such, upon import files of a given extension will associate with the Images Application.
Below we show a custom view, in which the Association attribute column is added to the Explorer list pane.
As expected, we find the *.TIF documents are Application associated, while their counterpart *.TFW world files are not:
In order for the world file content to be processed during a spatial location scan, the association to the Images application must be set.
This can be added as an Extension Association for effect during an import operation, or the attribute can be reviewed and modified from the document’s properties:
Here we see the *.TFW documents’ modified association in list view:
Re-execution of the spatial location scan results in the same Scan Summary:
Subsequent to the *.TFW association modification, the eponymous relationship between the raster image and its world file counterpart is recognized and the location information is applied to the raster image.
The result is as desired: