jkraemer

Keybase proof

I hereby claim:

• I am jkraemer on github.
• I am jkraemer (https://keybase.io/jkraemer) on keybase.
• I have a public key whose fingerprint is C388 0ACE 6187 419B 177C 472E 0862 5A14 CE3C DDAA

To claim this, I am signing this object:

jkraemer

de:                                                                                                                                                                       
  devise:                                                                                                                                                                 
    failure:                                                                                                                                                              
      invited: "Du hast bereits eine Einladung erhalten. Nimm die Einladung an um dein Nutzerkonto zu erstellen."                                                         
    invitations:                                                                                                                                                          
      send_instructions: "Eine Einladung wurde an %{email} verschickt."                                                                                                  

jkraemer

require 'benchmark'                                                                                                                                                       
require 'logger'                                                                                                                                                          
                                                                                                                                                                          
iterations = 1000000                                                                                                                                                      
                                                                                                                                                                          
logger = Logger.new(STDOUT)                                                                                                                                             

jkraemer

# Use a 4096 bit RSA key instead of 2048
rsa-key-size = 4096

# update to register with the specified e-mail address
email = user@host.com

# use a text interface instead of ncurses
text = True
non-interactive = True
agree-tos = True

jkraemer

class CreatePostgresqlTrgmIndex
  def self.call(model, column, concurrently: true)
    table = model.table_name
    column = column.sub(/.*\./, "")
    puts sql = "CREATE INDEX #{"CONCURRENTLY" if concurrently} index_#{table}_on_#{column}_trgm ON #{table} USING gin (#{column} gin_trgm_ops)"
    model.connection.execute sql
  rescue ActiveRecord::StatementInvalid
    raise $! unless $!.message =~ /PG::Duplicate/
  end
end

jkraemer

Ingredients

• a decent DEM
• gdal
• some computer

compute grayscale hillshade using gdaldem

gdaldem hillshade -compute_edges your_dem_file hillshade.tif

color-ramp to compute transparency (alpha channel)

In another bowl, prepare the following shade.ramp file: