The OSGeo FDO Data Access Technology stores geometry data to a SQLite database as FGF (Feature Geometry Format) objects. This section lists the object mappings between FGF (Feature Geometry Format) objects in a SQLite database to MapInfo objects. This information is helpful when creating object data that you plan to share with other applications, because it will help you understand how an object will be handled in another application.
The mappings between FGF object types and MapInfo Object types are:
| FGF Object | MapInfo Object |
|---|---|
|
FGF_Geom_None |
P_NULL |
|
FGF_Geom_Point |
P_POINT |
|
FGF_Geom_MultiPoint |
P_MPOINT |
|
FGF_Geom_LineString |
P_PLINE |
|
FGF_Geom_MultiLineString |
P_PLINE with multiple parts |
|
FGF_Geom_Polygon |
P_REGION with zero or more holes |
|
FGF_Geom_MultiPolygon |
P_REGION with multiple parts, each with zero or more holes |
|
FGF_Geom_MultiGeometry |
P_COLLECTION |
|
FGF_Geom_CurveString |
P_PLINE |
|
FGF_Geom_MultiCurveString |
P_PLINE with multiple parts |
|
FGF_Geom_CurvePolygon |
P_REGION |
|
FGF_Geom_MultiCurvePolygon |
P_REGION with multiple parts |
The mappings between MapInfo object types and FGF object types are:
| MapInfo Object | FGF Object |
|---|---|
|
P_POINT |
FGF_Geom_Point |
|
P_LINE |
FGF_Geom_LineString |
|
P_ARC |
FGF_Geom_LineString |
|
P_PLINE |
FGF_Geom_LineString or FGF_Geom_MultiLineString if multiple parts |
|
P_REGION |
FGF_Geom_Polygon - One exterior polygon. If it has multiple parts then each part is defined in a ring. FGF_Geom_MultiPolygon - More than one exterior polygon. If each exterior polygon has multiple parts then each part is defined in a ring |
|
P_RECT |
FGF_Geom_Polygon |
|
P_ROUNDRECT |
FGF_Geom_Polygon |
|
P_ELLIPSE |
FGF_Geom_Polygon |
|
P_MPOINT |
FGF_Geom_MultiPoint |
|
P_COLLECTION |
FGF_Geom_MultiGeometry |
Unsupported MapInfo objects are:
- P_NULL
- P_TEXT
- P_WINDOWPORT
- P_PIECHART
- P_BARCHART
When creating arcs, ellipses, or rounded rectangles in MapInfo Pro and then saving them back to a SQLite table, you may be asked to convert them to supported FGF object types. The MapInfo objects convert from arc to polyline, ellipse to polygon, and rounded rectangle to polygon.