Index of images
---------------
 
Terrrain Corrected Bouguer Anomalies     
      boug96al      -- Alaska
      boug96hw      -- Hawaiian Islands
      boug96pr      -- Puerto Rico and Virgin Islands
      boug96us      -- conterminous United States
      boug97mx      -- Mexico

Deflection of the Vertical, N/S component
      d96alxi      -- Alaska
      d96hwxi      -- Hawaiian Islands
      d96prxi      -- Puerto Rico and Virgin Islands
      d96usxi      -- conterminous United States
      dmx97ns      -- Mexico
      
Deflection of the Vertical, E/W component
      d96aleta      -- Alaska
      d96hweta      -- Hawaiian Islands
      d96preta      -- Puerto Rico and Virgin Islands
      d96useta      -- conterminous United States
      dmx97ew       -- Mexico
      
Geoid Height, EGM96 Global Geopotential Model
      egm96us       -- conterminous United States
      e96mxn        -- Mexico
      ww15mgh       -- Global
      
Topographic Relief
      elev96al      -- Alaska
      elev96hw      -- Hawaiian Islands
      elev96pr      -- Puerto Rico and Virgin Islands
      elev96us      -- conterminous United States
      el97mx        -- Mexico
      
Geoid Height, GEOID96 Geoid Model
      g96al      -- Alaska
      g96al1     -- Alaska, detail 
      g96hw      -- Hawaiian Islands
      g96pr      -- Puerto Rico and Virgin Islands
      g96us      -- conterminous United States
      
Geoid Height, G96SSS Geoid Model
      sss96us    -- conterminous United States

Geoid Height, MEXICO97 Geoid Model
      m97        -- Mexico
      
Miscellaneous Images
      gpsbms2    -- coverage of GPS on leveled benchmarks
      mcgh4      -- GEOID96 around the Mid-Continent Gravity High