PolyLineM
A shapefile PolyLineM consists of one or more parts. A part is a connected sequence of two or more points. Parts may or may not be connected to one another. Parts may or may not intersect one another.
- Box
- The bounding box for the PolyLineM stored in the order Xmin, Ymin, Xmax, Ymax
- NumParts
- The number of parts in the PolyLineM
- NumPoints
- The total number of points for all parts
- Parts
- An array of length NumParts
Stores, for each part, the index of its first point in the points array. Array indexes are numbered with respect to 0.
- Points
- An array of length NumPoints
The points for each part in the PolyLineM are stored end to end. The points for part 2 follow the points for part 1, and so on. The parts array holds the array index of the starting point for each part. There is no delimiter in the points array between parts.
- M Range
- The minimum and maximum measures for the PolyLineM stored in the order Mmin, Mmax
- M Array
- An array of length NumPoints
The measures for each part in the PolyLineM are stored end to end. The measures for part 2 follow the measures for part 1, and so on. The parts array holds the array index of the starting point for each part. There is no delimiter in the measure array between parts.
| Position | Field | Value | Type | Number | Byte order |
|---|---|---|---|---|---|
| Byte 0 | Shape Type | 23 | Integer | 1 | Little endian |
| Byte 4 | Box | Box | Double | 4 | Little endian |
| Byte 36 | NumParts | NumParts | Integer | 1 | Little endian |
| Byte 40 | NumPoints | NumPoints | Integer | 1 | Little endian |
| Byte 44 | Parts | Parts | Integer | NumParts | Little endian |
| Byte X | Points | Points | Point | NumPoints | Little endian |
| Byte Y | Mmin | Mmin | Double | 1 | Little endian |
| Byte Y+8 | Mmax | Mmax | Double | 1 | Little endian |
| Byte Y+16 | M Array | M Array | Double | NumPoints | Little endian |