5.2.3 Import Vector Map from Ghana Grid (meters)
Level of expertise required for this Chapter: Intermediate; specifically for LUPMIS @ TCPD
While explained in the previous Chapter (5.2.2), that some of the data of the Survey Department are in feet of the War Office, some others are hold in meters in the same projection (‘Ghana Grid’).
Find below the process to convert maps from Ghana Grid in meters. (Very similar process to convert from feet is explained in Chapter 5.2.2).
1. If the file is not in SHP format, convert it to SHP format. If it is in E00 format, see Chapter 5.4.2 and Annex 14.2.
2. Convert to DRA format and to UTM projection simultaneously: Main menu > Utilities > Latitude and Longitude utilities > XY file to another projection > Vector > Choose source map projection window: Ghana Grid (if not available, define it, as explained at Annex 1.1.7) > OK > Select SHP as file type (no other import format possible) > Select folder and file > Choose target map projection window: UTM 30 > Select DRA as file type > Specify new file name > Save > OK
3. Quality-check and see, if the converted data fit to other correct data, in particular GPS-tracked data (e.g. roads) or georeferenced photos.
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Note: If you have a database attached and save the re-projected DRA file under a new file name, you have to re-sample the database (DBF file) to the ‘new’ DRA file:
In the Project manager: Add layer > Select the ‘new’ DRA file > Open > Data link > Choose database > Select the ‘old’ DBF file > Open > Copy layer to live layer > OK
In live layer: Right-mouse > Save live layer as… > Select the ‘new’ DRA file >>>