anchor.diff:  "Upper Klamath",42.25,-121.815,CA
   Gerber,42.205,-121.13,CA
   "Iron Gate Reservoir",41.934,-122.436,CA
  -"Clear Lk - Klamath R",41.927,-121.075,CA
  +"Clear Lk",41.927,-121.075,CA
   Dwinnell,41.541,-122.376,CA
   "Trinity Lake",40.801,-122.762,CA
   Lewiston,40.727,-122.793,CA
  -"Ruth Dam",40.367,-123.433,CA
   "Lake Pillsbury",39.408,-122.958,CA
   "Lake Mendocino",39.199,-123.182,CA
  -"Warm Springs (usace)",38.723,-123.01,CA
  +"Warm Springs",38.723,-123.01,CA
   "Soulajule Dam",38.153,-122.782,CA
   Nicasio,38.075,-122.757,CA
   Kent,37.997,-122.702,CA
  
positive.code: "Thomas A Edison",37.37,-118.987,CA
  "Mammoth Pool",37.329,-119.328,CA
  "Crane Valley",37.283,-119.517,CA
  "Florence Lake (sce)",37.267,-118.967,CA
  "Huntington Lake (usbr)",37.228,-119.221,CA
  "Shaver Lake",37.145,-119.302,CA
  "Redinger Lake",37.145,-119.449,CA
  "Kerckhoff Dam",37.128,-119.524,CA
  
negative.code: Relief,38.267,-119.733,CA
  "Beardsley Lake",38.203,-120.075,CA
  Strawberry,38.2,-119.983,CA
  "New Melones Reservoir",37.9481,-120.525,CA
  Tulloch,37.875,-120.603,CA
  "Cherry Lake",37.976,-119.913,CA
  