class Google::Apis::VectortileV1::FirstDerivativeElevationGrid
A packed representation of a 2D grid of uniformly spaced points containing elevation data. Each point within the grid represents the altitude in meters above average sea level at that location within the tile. Elevations provided are (generally) relative to the EGM96 geoid, however some areas will be relative to NAVD88. EGM96 and NAVD88 are off by no more than 2 meters. The grid is oriented north-west to south-east, as illustrated: rows.a rows .a -----------------
| | | N | | ^ | | | | | W <—–> E | | | | | v | | S | | | -----------------
rows.a rows.a Rather than storing the altitudes directly, we store the diffs between them as integers at some requested level of precision to take advantage of integer packing. The actual altitude values a[] can be reconstructed using the scale and each row's first_altitude and altitude_diff fields. More details in go/elevation-encoding- options-for-enduro under “Recommended implementation”.
Attributes
A multiplier applied to the altitude fields below to extract the actual altitudes in meters from the elevation grid. Corresponds to the JSON property `altitudeMultiplier` @return [Float]
Public Class Methods
# File lib/google/apis/vectortile_v1/classes.rb, line 346 def initialize(**args) update!(**args) end
Public Instance Methods
Update properties of this object
# File lib/google/apis/vectortile_v1/classes.rb, line 351 def update!(**args) @altitude_multiplier = args[:altitude_multiplier] if args.key?(:altitude_multiplier) @rows = args[:rows] if args.key?(:rows) end