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" ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " )" ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " )" ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) " ) ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . ! . Texas Oklahoma Arkansas Alabama Louisiana Mississippi Missouri Tennessee Kansas Kentucky Florida Illinois Houston Dallas San Antonio Austin Memphis Tulsa Fort Worth New Orleans Oklahoma City Birmingham Mobile Waco Lubbock Montgomery Abilene Jackson Plano Little Rock Shreveport Beaumont Springfield Baton Rouge Wichita Falls Lafayette Metairie Norman Galveston Port Arthur Denton Lawton Tyler Temple Gulfport Jonesboro Bryan Midland Tuscaloosa Jackson Killeen Longview San Angelo Fort Smith Pine Bluff Odessa Victoria Monroe Fayetteville Pensacola Broken Arrow Bossier City Lake Charles North Little Rock College Station The Woodlands Enid Texas City Muskogee Paris Biloxi Tupelo McKinney Conroe Anniston Meridian Rogers Conway Lufkin League City Gadsden Sherman Hattiesburg Bessemer Joplin Vicksburg Shawnee Moore Huntsville Stillwater Prichard Laplace Hot Springs Greenville Alexandria Texarkana Paducah Slidell Ponca City Houma Bartlesville Lake Jackson Nacogdoches New Braunfels Pascagoula Cape Girardeau San Marcos Ferry Pass New Iberia Hoover Wright Center Point 86°W 87°W 87°W 88°W 88°W 89°W 89°W 90°W 90°W 91°W 91°W 92°W 92°W 93°W 93°W 94°W 94°W 95°W 95°W 96°W 96°W 97°W 97°W 98°W 98°W 99°W 99°W 100°W 100°W 101°W 101°W 102°W 102°W 103°W 37°N 37°N 36°N 36°N 35°N 35°N 34°N 34°N 33°N 33°N 32°N 32°N 31°N 31°N 30°N 30°N 29°N 29°N 0 25 50 75 100 Miles GEOID12A minus GEOID12 (8/17/2012) Change in geoid height -41 to -20 cm -20 to -10 cm -10 to -5 cm -5 to -2 cm -2 to -1 cm +1 to +2 cm +2 to +5 cm +5 to +10 cm +10 to +20 cm +20 to +37 cm 1 cm change contour GPSBM changes for GEOID12A " h Corrected orthometric height (7) k j Corrected ellipsoid height (1) ! C Duplicate station removed (3) G F GPSBM rejected (37) GPSBMs used for GEOID12A " ) Ellipsoid heights from NGSIDB ! . Ellipsoid heights from OPUS 0 50 100 150 200 Kilometers