I limited the maximum zoom to level 14 because level 15 can produce images of over 10000x10000 pixels. SBuilder9 bogs down with such large images, and ground2k usually crashes. A level 14 gives about 5000x5000 pixels, but the actual size is determined by the LOD8 location.
Some areas don't support level14 for all sources, but level 13 generally works for all, with a resolution of about 19m/pixel... again depending on location of the LOD8. Some areas will need level 12 for some sources... Level 12 is still 38m/pixel, and not too bad as a background. 4.8meters/pixel is the actual BGL limit, same as resample. Drawing at 38meters/pixel will save some errors in Ground2k, by not placing lines too close together or crossing them.
With the generated TXT file. SBuilder will autoload them... just cancel the calibration popup. Due to the path requirements in a ground2k LWM file, your better off adding the calibration within ground2k, and then saving the LWM file, rather than auto-generating an LWM file.
Changing from one map source to another is pretty interesting. Different ares of the world show different details among the sources. In ground2k, I'll take a BMP ( for ex. 12_ArcGIS_World_Street_Map_8_645_223.bmp ) and copy it as 12_8_645_223.bmp, and use that for the project. The land-water imagery is very good. but I know the 12_OpenStreetMap_8_645_223.bmp has better road definition, so I can copy that as 12_8_645_223.bmp ( overwriting the ArcGIS copy ) and use that for roads upon reloading ground2k... same LWM project, different map.
I included the cache clearing button because it grows tremendously as you scroll about looking at the world in different levels. Better to clear it after a session.
Dick
