Module: GDAL::RasterBand::Extensions

Included in:
GDAL::RasterBand
Defined in:
lib/gdal/extensions/raster_band/extensions.rb

Instance Method Summary collapse

Instance Method Details

#each_overview ⇒ Enumerator 



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# File 'lib/gdal/extensions/raster_band/extensions.rb', line 11

def each_overview
  return enum_for(:each_overview) unless block_given?

  overview_count.times do |i|
    yield overview(i)
  end
end

#overviews ⇒ Array 



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# File 'lib/gdal/extensions/raster_band/extensions.rb', line 20

def overviews
  each_overview.to_a
end

#pixel_count ⇒ Integer

The total number of pixels in the raster band.



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# File 'lib/gdal/extensions/raster_band/extensions.rb', line 70

def pixel_count
  x_size * y_size
end

#projected_points ⇒ NArray

Each pixel of the raster projected using the dataset’s geo_transform. The output NArray is a 3D array where the inner-most array is a the lat an lon, those are contained in an array per pixel line, and finally the outer array contains each of the pixel lines.



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# File 'lib/gdal/extensions/raster_band/extensions.rb', line 52

def projected_points
  narray = GDAL._narray_from_data_type(data_type, 2, x_size, y_size)
  geo_transform = dataset.geo_transform

  y_size.times do |y_point|
    x_size.times do |x_point|
      coords = geo_transform.apply_geo_transform(x_point, y_point)
      narray[0, x_point, y_point] = coords[:x_geo] || 0
      narray[1, x_point, y_point] = coords[:y_geo] || 0
    end
  end

  narray
end

#to_a ⇒ Array 



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# File 'lib/gdal/extensions/raster_band/extensions.rb', line 25

def to_a
  read_lines_by_block.to_a
end

#to_na(to_data_type = nil) ⇒ NArray

Iterates through all lines and builds an NArray of pixels.



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# File 'lib/gdal/extensions/raster_band/extensions.rb', line 32

def to_na(to_data_type = nil)
  narray = NArray.to_na(to_a)

  return narray unless to_data_type

  narray_type = GDAL._gdal_data_type_to_narray_type_constant(to_data_type)

  narray.to_type(narray_type)
end

#to_nna ⇒ Object 



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# File 'lib/gdal/extensions/raster_band/extensions.rb', line 42

def to_nna
  Numo::NArray[to_a]
end