The following group codes are used by GEODATA objects.
GEODATA group codes
Group code
Description
90
AcDbGeoData Object version
1 - 2009
2 - 2010
70
Type of design coordinates:
0 - Unknown
1 - Local grid
2 - Projected grid
3 - Geographic (latitude/longitude)
330
ObjectId of host block table record
10,20,30
Design point, reference point in WCS coordinates
11,21,31
Reference point in coordinate system coordinates, valid only when coordinate type is Local Grid.
12,22
North direction vector (2D)
40
Horizontal unit scale, factor which converts horizontal design coordinates to meters by multiplication.
41
Vertical unit scale, factor which converts vertical design coordinates to meters by multiplication.
91
Horizontal units per UnitsValue enumeration. Will be kUnitsUndefined if units specified by horizontal unit scale is not supported by AutoCAD enumeration.
92
Vertical units per UnitsValue enumeration. Will be kUnitsUndefined if units specified by vertical unit scale is not supported by AutoCAD enumeration.
210,220,230
Up direction
95
Scale estimation method:
1 - None
2 - User specified scale factor
3 - Grid scale at reference point
4 - Prismoidal
294
Bool flag specifying whether to do sea level correction