Georeferenced bitmaps can be imported into and exported from MapViewer.
Import
If you are importing a georeferenced bitmap, you must have the Specify import options box checked in the Import Boundary File dialog to utilize the georeferencing information. During the import, the Bitmap Import Options dialog appears. This dialog allows you to choose from the available spatial reference options for the particular bitmap file. If one or more sources of spatial reference information are available for the bitmap file, a Spatial Reference list is displayed, allowing you to choose the source to use.
Export
Most bitmap file storage formats do not have a way to store the spatial reference information in the same file as the bitmap. For these formats, the only way the spatial reference information can be saved is in a separate file. One bitmap storage format, GeoTIFF (Geographic Tagged Image File Format), allows the spatial reference information to be stored in one file along with the image.
If Ignore Spatial Reference Information is chosen, spatial reference information is saved. If Save Spatial Information is chosen, any available spatial reference information will be saved, depending on the selected export options.
Spatial Information
Recognized sources of spatial information include:
Option |
Description |
None |
Choose this option if you do not want spatial reference information to be passed to the program, even if it is available. This option imports the bitmap with pixel coordinates. (Import) |
Embedded GeoTIFF Parameters |
This option is only available if a TIFF (Tagged Image File Format) file is selected. When this option is selected, the spatial reference information is extracted from GeoTIFF tags embedded within the file. GeoTIFF is a vendor-independent format that can be generated by a variety of geographic software packages. |
Golden Software Reference [.GSR] File |
This option is available upon import if a [.GSR] file of the same name as the selected bitmap is found in the directory. Golden Software supports a text-based format for storing spatial reference information in a separate file. |
Blue Marble [.RSF] File |
This option is available upon import if a [.RSF] file of the same name as the selected bitmap is found in the directory. Blue Marble Geographics supports a text-based format for storing georeference information in a separate file. |
ESRI World File |
This option is available upon import if a world file of the same name as the selected bitmap is found in the directory. Environmental Sciences Research Institute (ESRI) supports a text-based format for storing georeference information in a separate file. The world file extension is created with the first and third characters of the bitmap file extension plus a final " w." For example, BITMAP.TIF would have an associated world file of BITMAP.TFW. |
See Also