Map Polyline is a (potentially-large) set of map locations used to approximate a continuous curve on a map. Typical use would be to convey national borders, lease boundaries, river courses, etc.
Label |
Restrictions |
Comments |
Optionality |
Units |
|
|---|---|---|---|---|---|
| CATEGORY | C=1, | R=ASCII | 1 | MAND | |
| POLYLINE-TYPE | C=1, | R=USHORT | 2 | MAND | |
| LOCATION-ON-MAP | C=1, | R=OBJREF | 3 | MAND | |
| RED-VALUE | C=1, | R=USHORT | 4 | ||
| GREEN-VALUE | C=1, | R=USHORT | 4 | ||
| BLUE-VALUE | C=1, | R=USHORT | 4 | ||
| LINE-WIDTH | C=1, | R=USHORT | 5 | ||
| LINE-STYLE | C=1, | R=ASCII | 6 | ||
CATEGORY C=1, R=ASCII MAND
Name of the data category to which the graphic object represented by the polyline belongs. See the 217-MAP-ANNOTATION object for the allowable values.
POLYLINE-TYPE C=1, R=USHORT MAND
POLYLINE-TYPE indicates whether the polyline is open or is a closed loop. Note that this duplicates the standard Geoshare method of indicating open/closed, which is to repeat the first and last point for closed loops. This attribute is required for historical reasons. The allowable values are chosen from the following list:
| Polyline Type | ||
|---|---|---|
| Code | Mnemonic | Definition |
| 0 | OPEN | An open polyline |
| 1 | CLOSED | A closed polyline |
LOCATION-ON-MAP C=1, R=OBJREF MAND
Reference to a 217-MAP-LOCATION-SET object defining the locations of the polyline.
RED-VALUE C=1, R=USHORT GREEN-VALUE C=1, R=USHORT BLUE-VALUE C=1, R=USHORT
Relative intensity of red, green and blue to encode color attribute. For reference, white is indicated by RED-VALUE = GREEN-VALUE = BLUE-VALUE = 255, and black is RED-VALUE = GREEN-VALUE = BLUE-VALUE = 0.
LINE-WIDTH C=1, R=USHORT
Relative line width of the drawn feature, or printed character, from 0 to 255.
LINE-STYLE C=1, R=ASCII
Indicates line style: solid, dashed, etc. A candidate starting list is:
| Line Style Values |
|---|
| SOLID |
| SHORT DASHED |
| MEDIUM DASHED |
| LONG DASHED |
| DOTTED |
| DOT-DASH |
| DOT-DOT-DASH |
| DOT-DASH-DASH |
Send questions and comments to
Jim.Theriot@POSC.org
Copyright © 2002, 03
Petrotechnical Open Software Corporation.
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Copyright © 2001 Geoshare Users Group.