# To extract models from a 12da file

You can use the Trimble Access Roads software to create a GENIO .mos file that contains models extracted from a .12da file. This is particularly useful if you are not able to export GENIO files from the 12d Model software.

If the .12da file has been exported from the 12d Model software as a zipped file, it has the file extension .12daz. To extract the .12da file so you can use it in Trimble Access, in File Explorer change the extension of the .12daz file to .zip and then use WinZip to extract the file.

The conversion from .12da files to GENIO files is not available when using Trimble Access on a Trimble controller running Android.In that case, use the 12da file to GENIO road converter for Trimble Access utility, which can be downloaded from the Software and utilities page of the Trimble Access Help Portal.

1. Tap and select Define.
2. Select GENIO road.

3. In the Select GENIO file screen, tap 12da.

   Alternatively, tap in the map toolbar to open the Layer manager, select the Map files tab and then tap 12da. This option is available only when Roads is the currently selected application.

4. Tap to browse to the location of the 12da file and select it. Tap Accept.

5. In the conversion utility window, select the models (layers) containing road strings that you want to include in the new GENIO file.

   You must select at least one model that contains an alignment. Models containing alignments are colored red.

   - The Roads software requires each road defined from a GENIO file to include an alignment (6D string). If the model(s) selected do not include a 6D string but do include a 12D string then the conversion utility will generate a 6D string with the same geometry as the 12D string and with computed positions every 5 meters or feet. However for arcs with small radii the computed positions are based on an arc to chord separation of a maximum of 10 mm to ensure that the road is accurately represented.
   - The conversion utility converts 3D strings that have names starting with INT or IA to 5D interface strings in the GENIO file.
   - If there are duplicate 6D string names, the duplicates are given an incrementing suffix, ie. -1, -2, -3....
6. Tap OK. .

7. Enter the name of the new file and tap OK.

   The new GENIO file is listed in the Select GENIO file screen.

8. Define the GENIO road from the new GENIO file. See To define a GENIO road.