DeLorme 6 - Manual (Page 131)

Working With GIS
123
Boolean -> Byte -> Small Interger -> Interger -> Big Integer
String <-> URLs
String -> Memo
Float -> Double
Datetime
Document
Currency
Memo
Notes
• The master attribute and changes tables of the target layer are emptied. The
extended attributes tables are not emptied, but they must be manually
rejoined after the import process is completed. The changes table has an
entry written to it indicating a replace operation occurred to ensure
OpenSpace Synchronization still operates. The changes table has an entry
written to it for each geometry that is added to the target layer.
• By definition, any attribute is automatically compatible with itself, and its
precision, if applicable, can widen or narrow.
• The same conditions that exist for Append for Geocoded point layers and
unregistered .dxf, etc layers also exist for Replace.
Replace Examples
Below are two examples of how a replace operation would affect the primary
attribute table. Any attribute columns present in the import but absent in the target
layer will be added. Unpopulated records are given NULL values. Any columns absent
in the import but present in the target layer will be left in place, the data will be
erased and populated with NULL values. The spatial affect of Replace is the same as
deleting all geometries in the target layer and pasting in all geometries from the
source layer.
Example 1
SOURCE LAYER
ID Name Type
1 Rt 1 Pavement
2 Deering Ave Pavement
3 Higgins Rd Dirt
TARGET LAYER
ID Name Type
4 Rt 46 Pavement
5 DeLorme Drive Pavement
6 Merrill Lane Dirt