ArcGrid ASCII files are convenient to pass data between application software. Before using terrain data in ArcGrid ASCII format files (*.asc, *.agr), they must be imported into GeoMedia Grid's native format raster files (*.mfm) and placed as layers under what is termed a Study Area. I have no idea what .mfm stands for and I could not find any documentation details on the extension name. To import an ArcGrid ASCII file, the following steps can be done.
- Run GeoMedia and open up or create a GeoWorkspace with the desired coordinate system and a read/write warehouse connection.
- Select Grid | Study Area | Import File(s).
The Import File(s) dialog box appears.
- Click Browse and select an ArcGrid ASCII file e.g. B3.asc.
- Click Open.
The File Type(s) Found dialog box may appear.
- Choose ArcGrid ASCII. Click OK.
- Click the Coordinate system file Browse button. Choose the appropriate coordinate system file (*.csf) and click Open.
The Import File(s) dialog box is updated with the selected.
- Click Next.
The selected file is scanned and then the ASC Input data dialog box appears.
- Click the X Coordinate and Y Coordinate units drop down list and select the appropriate horizontal units e.g. feet.
- In the Cell resolution text field, type in the correct cell spacing e.g. 2.
- In the Cell resolution units drop down list, select the correct vertical units e.g. feet.
At this point, the ASC Input data dialog box may look like this.
- Click OK.
The Import File(s) dialog box appears.
Note: By default the Study Area name will be Study Area 1. Right click on the name to rename it to something else if necessary.
- Click Next.
The Import File(s) dialog box is updated with statistical information about the file.
- Click Finish.
The ArcGrid ASCII file is imported into GeoMedia Grid and is ready to be used.
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