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Contents
module GeoConcerns
module Processors
module Raster
class Info
attr_accessor :doc
attr_writer :min_max, :size
def initialize(path)
@doc = gdalinfo(path)
end
# Returns the min and max values for a raster.
# @return [String] computed min and max values
def min_max
@min_max ||= raster_min_max
end
# Returns the raster size.
# @return [Array] raster size
def size
@size ||= raster_size
end
private
# Runs the gdalinfo command and returns the result as a string.
# @param path [String] path to raster file
# @return [String] output of gdalinfo
def gdalinfo(path)
stdout, _stderr, _status = Open3.capture3("gdalinfo -mm #{path}")
stdout
end
# Given an output string from the gdalinfo command, returns
# a formatted string for the computed min and max values.
# @return [String] computed min and max values
def raster_min_max
match = %r{(?<=Computed Min/Max=).*?(?=\s)}.match(doc)
match ? match[0].tr(',', ' ') : ''
end
# Given an output string from the gdalinfo command, returns
# an array containing the raster width and height as strings.
# @return [String] raster size
def raster_size
match = /(?<=Size is ).*/.match(doc)
match ? match[0].tr(',', '') : ''
end
end
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems