package vector_tile

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View/edit binary Protocol Buffers messages

• repeated Tile.Layer layers = 3

Used in: Layer

• optional uint64 id = 1

• repeated uint32 tags = 2

  Tags of this feature are encoded as repeated pairs of integers. Even indexed values (n, beginning with 0) are themselves indexes into the layer's keys list. Odd indexed values (n+1) are indexes into the layer's values list. The first (n=0) tag of a feature, therefore, has a key of layer.keys[feature.tags[0]] and a value of layer.values[feature.tags[1]].

• optional GeomType type = 3

  The type of geometry stored in this feature.

• repeated uint32 geometry = 4

  Contains a stream of commands and parameters (vertices). The repeat count is shifted to the left by 3 bits. This means that the command has 3 bits (0-7). The repeat count indicates how often this command is to be repeated. Defined commands are: - MoveTo: 1 (2 parameters follow) - LineTo: 2 (2 parameters follow) - ClosePath: 7 (no parameters follow) Commands are encoded as uint32 varints. Vertex parameters are encoded as deltas to the previous position and, as they may be negative, are further "zigzag" encoded as unsigned 32-bit ints: n = (n << 1) ^ (n >> 31) Ex.: MoveTo(3, 6), LineTo(8, 12), LineTo(20, 34), ClosePath Encoded as: [ 9 6 12 18 10 12 24 44 15 ] | | `> [00001 111] command type 7 (ClosePath), length 1 | | ===== relative LineTo(+12, +22) == LineTo(20, 34) | | ===== relative LineTo(+5, +6) == LineTo(8, 12) | `> [00010 010] = command type 2 (LineTo), length 2 | ==== relative MoveTo(+3, +6) `> [00001 001] = command type 1 (MoveTo), length 1 The original position is (0,0).

Used in: Feature

• UNKNOWN = 0

• POINT = 1

• LINESTRING = 2

• POLYGON = 3

Used in: Tile

• required uint32 version = 15

  Any compliant implementation must first read the version number encoded in this message and choose the correct implementation for this version number before proceeding to decode other parts of this message.

• required string name = 1

• repeated Feature features = 2

  The actual features in this tile.

• repeated string keys = 3

  Dictionary encoding for keys

• repeated Value values = 4

  Dictionary encoding for values

• optional uint32 extent = 5

  The bounding box in this tile spans from 0..4095 units

Variant type encoding

Used in: Layer

• optional string string_value = 1

  Exactly one of these values may be present in a valid message

• optional float float_value = 2

• optional double double_value = 3

• optional int64 int_value = 4

• optional uint64 uint_value = 5

• optional sint64 sint_value = 6

• optional bool bool_value = 7