Class: Map::Gdal::NdviService

Inherits:
Object
  • Object
show all
Includes:
Base
Defined in:
lib/map/gdal/ndvi_service.rb

Instance Attribute Summary

Attributes included from Base

#files_to_clean

Instance Method Summary collapse

Methods included from Base

#add_to_clean, #clean, #gdal_running?, #get_file_name_with_path, #get_layer_name, #get_path_to_temp_file, #options_to_command_line, #run_command, #store_kml, #tmp_file

Constructor Details

#initialize(tif_red, tif_near_red) ⇒ NdviService

Returns a new instance of NdviService.



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# File 'lib/map/gdal/ndvi_service.rb', line 6

def initialize(tif_red, tif_near_red)
  @tif_red = tif_red
  @tif_near_red = tif_near_red
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/map/gdal/ndvi_service.rb', line 11

def call
  tif_out = get_path_to_temp_file('calculated', 'tif')
  add_to_clean(tif_out)
  add_to_clean("#{tif_out}.aux.xml")

  run_command(
    %{
      gdal_calc.py
        --overwrite
        -B #{@tif_red}
        -A #{@tif_near_red}
        --outfile=#{tif_out}
        --calc="(A.astype(float)-B)/(A.astype(float)+B)"
        --overwrite
        --type=Float32
        --NoDataValue=-9999
    }.squish
  )

  tif_out
end