Data Item _em_map.data_type
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General 
- Item name
- _em_map.data_type
- Category name
- em_map
- Attribute name
- data_type
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
The map data_type describes the data structure of the map voxels.
(CCP4 map header word 4 MODE)
EMDB currently holds MODE=0,1,and 2 maps; the majority are MODE=2.
MAPS with MODES other than 2 and 0 may not work in CCP4 programs.
MODE = 0: 8 bits, density stored as a signed byte (-128 to 127, ISO/IEC 10967)
MODE = 1: 16 bits, density stored as a signed integer (-32768 to 32767, ISO/IEC 10967)
MODE = 2: 32 bits, density stored as a floating point number (IEEE 754)
Data Type 
- Data type code
- line
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| Image stored as floating point number (4 bytes) | |
| Image stored as signed byte | |
| Image stored as signed integer (2 bytes) |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| Image stored as floating point number (4 bytes) | |
| Image stored as signed byte | |
| Image stored as signed integer (2 bytes) |