| Data Source | Source_Layer ID (use this value) | Extent (West,South, East, North) |
| (default) Find the Best Available data at this point | -1 | -180,-90,180,90 |
| SRTM 3 arc-second: All Northern Latitudes |
SRTM_3SEC_GLOBAL_ELEV_NORTH | -180.000000012589,42.0000000054 to 179.99999997275,60.00000000468 |
| SRTM 3 arc-second: Middle Latitudes |
SRTM_3SEC_GLOBAL_ELEV_CENTRAL | -179.000000007803,12.0000000044402 to 169.999999977999,42.0000000032401 |
| SRTM 3 arc-second: Southern Africa, Australia, SE Asia |
SRTM_3SEC_GLOBAL_ELEV_SOUTHEAST | -38.9999999991601,-55.9999999964333 to 179.999999992079,14.0000000007598 |
| SRTM 3 arc-second: Central and South America, Western Africa, Pacific Islands |
SRTM_3SEC_GLOBAL_ELEV_SOUTHWEST | -180.000000007038,-55.9999999942731 to 11.99999998515,30.00000000228 |
| SRTM 1 arc-second: Contiguous U.S. |
SRTM_1SEC_ELEV_US | -180.0,-15.00 to 180.0,60.00 |
| NED 2 arc-second: Alaska | NED.AK_NED | -180.00333333334379,50.996666666667622 to -129.99666666663225,72.00333333335108 |
| NED 1 arc-second: Alaska North Slope | NED_AK_1AS | -159.0016666667,67.9983656174 to -149.9984307324,72.0017484139 |
| NED 1 arc-second: Contiguous United States | NED.CONUS_NED | -125,23.9999999973783 to -65.9983333286253,49.9999999992314 |
| NED 1 arc-second: Hawaii | NED.HI_NED | -161.0016666667,17.9983333327742 to -153.998333333366,23.0016666659869 |
| NED 1 arc-second: Puerto Rico | NED.PR_NED | -68.0016666666668,16.9983333328051 to -63.9983333330132,19.0016666662453 |
| NED 1 arc-second: U.S. Territorial Islands with east longitude | NED.TI_E_NED | 133.9994444444,4.99944444427556 to 164.000555555645,16.0005555550985 |
| NED 1 arc-second: U.S. Territorial Islands with west longitude | NED.TI_W_NED | -171.000555555605,-15.0005555550877 to -168.999444444485,-13.999444444001 |
| NED 1/3rd arc-second: Eastern United States | NED.CONUS_NED_13E | -99.00055555556,24.9994444436157 to -65.9994444443037,49.0005555546217 |
| NED 1/3rd arc-second: Western United States | NED.CONUS_NED_13W | -125.00055555557,25.9994444419356 to -98.9994444424024,49.000555554697 |
| NED 1/3rd arc-second: Alaska North Slope | NED.AK_NED_13 | -159.0,68.0 to -150.0,72.0 |
| NED 1/3rd arc-second: Hawaii | NED.HI_NED_13 | -161.00055555563,17.9994444438804 to -153.999444444485,23.0005555548894 |
| NED 1/3rd arc-second: U.S. Territorial Islands with east longitude | NED.TI_E_NED_13 | 133.9994444444,4.99944444427556 to 164.000555555645,16.0005555550985 |
| NED 1/3rd arc-second: U.S. Territorial Islands with west longitude | NED.TI_W_NED_13 | -171.000555555605,-15.0005555550877 to -168.999444444485,-13.999444444001 |
| NED 1/9th arc-second: Kenai, Alaska | Elev_AK_Kenai | -151.416091,60.489848 to -150.482042,61.006746 |
| NED 1/9th arc-second: Valdez, Alaska | Elev_AK_Valdez | -146.8134180015,60.9989665178 to -145.6874919855,61.2505097478 |
| NED 1/9th arc-second: Alabama-Louisiana-Mississippi Coast | Elev_AL_LA_MS_Coast | -94.000191377,28.9998020279 to -87.4998185067,32.0001975477 |
| NED 1/9th arc-second: Lukeville, Arizona | Elev_AZ_Lukeville | -114.6555352444,31.834782844 to -112.6855042226,32.499906354 |
| NED 1/9th arc-second: Arizona-Mexico Border (Central) | Elev_AZ_MX_Border_Central | -114.0115316871,31.2469720034 to -111.0598647843,32.2911696178 |
| NED 1/9th arc-second: Arizona-Mexico Border (Eastern) | Elev_AZ_MX_Border_East | -111.0841397757,31.2840198153 to -108.5404358685,31.3478161167 |
| NED 1/9th arc-second: Arizona-Mexico Border (Western) | Elev_AZ_MX_Border_West | -114.8663844738,32.1935198041 to -113.9861374898,32.7746000975 |
| NED 1/9th arc-second: Nogales, Arizona (Eastern) | Elev_AZ_NogalesEast | -109.8516048344,31.2324015559 to -108.5528701626,31.4365065105 |
| NED 1/9th arc-second: Nogales, Arizona (Western) | Elev_AZ_NogalesWest | -111.0723646669,31.3284372485 to -110.0222411261,31.4366779979 |
| NED 1/9th arc-second: Sasabe, Arizona | Elev_AZ_Sasabe | -112.7037916728,31.3196036288 to -111.0369396876,31.8970419466 |
| NED 1/9th arc-second: Alameda, California | Elev_CA_Alameda | -122.3520345333,37.4539514444 to -121.4637011289,37.9138897528 |
| NED 1/9th arc-second: Canyon Fire, California | Elev_CA_CanyonFire | -118.7233877837,34.0256729124 to -118.6316902455,34.0841914356 |
| NED 1/9th arc-second: Day Fire, California | Elev_CA_DayFire | -118.9962873203,34.4566533531 to -118.6355465507,34.7160052257 |
| NED 1/9th arc-second: California-Mexico Border 1 | Elev_CA_MX_Border | -117.1281781932,32.4549946235 to -114.7804310918,32.7451489677 |
| NED 1/9th arc-second: California-Mexico Border 2 | Elev_CA_MX_Border_2 | -117.1454413392,32.5308894372 to -115.7868918478,32.7567227886 |
| NED 1/9th arc-second: Poway, California | Elev_CA_Poway | -117.0845670198,32.9269844135 to -116.9400917111,33.0666757715 |
| NED 1/9th arc-second: Sacramento, California | Elev_CA_Sacramento | -121.5729010839,38.3817749922 to -121.1849072509,38.7400465968 |
| NED 1/9th arc-second: San Diego, California | Elev_CA_SanDiego | -117.2836500385,32.5322214134 to -116.9051932181,33.118270843 |
| NED 1/9th arc-second: Denver, Colorado | Elev_CO_Denver | -105.3217533293,39.5282126507 to -104.4799940027,40.0156818255 |
| NED 1/9th arc-second: Sussex County, Delaware | Elev_DE_SussexCounty | -75.7226850645,38.4498915766 to -75.0354936515,38.9617743336 |
| NED 1/9th arc-second: Escambia County, Florida | Elev_FL_EscambiaCounty | -87.6433148502,30.2783906166 to -86.8293025045,31.0074029623 |
| NED 1/9th arc-second: Northern Jefferson County, Florida | Elev_FL_JeffersonCountyNorth | -84.0947513383,30.2836715352 to -83.5858006803,30.6937950248 |
| NED 1/9th arc-second: Lake County, Florida | Elev_FL_LakeCounty | -81.9641403287,28.3331248177 to -81.3476279335,29.2836495851 |
| NED 1/9th arc-second: Northwest Florida Water Management District | Elev_FL_NWFWMD | -86.043194143,30.0296175491 to -84.3039656089,31.006592936 |
| NED 1/9th arc-second: Okaloosa County, Florida | Elev_FL_OkaloosaCounty | -87.0001851852,29.999814814 to -85.9998148148,31.5001851844 |
| NED 1/9th arc-second: Santa Rosa County, Florida | Elev_FL_SantaRosaCounty | -87.3239216684,30.3422696426 to -86.7758969332,31.0084733996 |
| NED 1/9th arc-second: Southwest Florida Water Management District | Elev_FL_SWFWMD | -82.657791913,27.5100044198 to -81.5081621915,28.6389242631 |
| NED 1/9th arc-second: Volusia County, Florida | Elev_FL_VolusiaCounty | -81.5738731554,28.6115898068 to -80.7269904393,29.4281638809 |
| NED 1/9th arc-second: Walton County, Florida | Elev_FL_WaltonCounty | -86.4075220361,30.2623789634 to -85.8230775449,31.002749393 |
| NED 1/9th arc-second: Potato Creek, Georgia | Elev_GA_PotatoCreek | -84.453536,32.782067 to -84.160755,33.250355 |
| NED 1/9th arc-second: Miscellaneous Areas in Idaho | Elev_ID_MiscAreas | -116.8176830356,42.5832927936 to -111.3889171692,47.5700215876 |
| NED 1/9th arc-second: Boone County, Illinois | Elev_IL_BooneCounty | -88.9430893038,42.1523596559 to -88.704385581,42.4960325229 |
| NED 1/9th arc-second: Winnebago County, Illinois | Elev_IL_WinnebagoCounty | -89.4056871447,42.1481140585 to -88.9331871067,42.5004597657 |
| NED 1/9th arc-second: Fort Riley, Kansas | Elev_KS_FortRiley | -96.9803755376,39.0257218869 to -96.6646965,39.3163391941 |
| NED 1/9th arc-second: Johnson County, Kansas | Elev_KS_JohnsonCounty | -95.0663453598,38.7039869561 to -94.5999255694,39.0649746394 |
| NED 1/9th arc-second: Kansas River, Kansas | Elev_KS_KansasRiver | -96.906533698,38.7302997656 to -94.588323636,39.4232319198 |
| NED 1/9th arc-second: Southern Leavenworth County, Kansas | Elev_KS_LeavenworthCountySouth | -95.194363,38.947068 to -94.904803,39.027022 |
| NED 1/9th arc-second: Sedgwick County, Kansas | Elev_KS_SedgwickCounty | -97.808371,37.474182 to -97.098448,37.912610 |
| NED 1/9th arc-second: Louisiana | Elev_LA_State | -94.0735949731,29.0383552307 to -89.0942735871,33.0670592567 |
| NED 1/9th arc-second: Augusta, Maine | Elev_ME_Augusta | -69.9273792204,44.2540251667 to -69.6084594418,44.4035004873 |
| NED 1/9th arc-second: Southwest Coastline, Maine | Elev_ME_SouthwestCoastline | -70.8427542352,43.0529783193 to -69.8419825498,43.9800462947 |
| NED 1/9th arc-second: Baltimore, Maryland | Elev_MD_Baltimore | -76.714041108,39.1957071463 to -76.5265102288,39.3727133333 |
| NED 1/9th arc-second: Baltimore County, Maryland | Elev_MD_BaltimoreCounty | -76.321039748,39.1939846161 to -76.321039748,39.7223488559 |
| NED 1/9th arc-second: Central and Eastern Maryland | Elev_MD_CentralAndEast | -77.2935053066,37.9096236032 to -75.0254569502,39.7289505766 |
| NED 1/9th arc-second: Eastern Areas in Maryland | Elev_MD_EasternAreas | -76.277731,38.729729 to -75.699333,39.372299 |
| NED 1/9th arc-second: Juarez, Mexico | Elev_MX_Juarez | -106.638783361,31.4748564422 to -106.215635179,31.7840231336 |
| NED 1/9th arc-second: Minnesota-North Dakota Border | Elev_MN_ND_Border | -97.73661,46.35916 to -96.08243,49.05173 |
| NED 1/9th arc-second: Red River, Minnesota | Elev_MN_RedRiver | -97.24629,46.32519 to -95.21825,49.00004 |
| NED 1/9th arc-second: Carroll, Chariton, Lafayette, and Saline Counties, Missouri | Elev_MO_CarrollCharitonLafayetteSalineCounties | -94.118688,38.906512 to -92.687331,39.708472 |
| NED 1/9th arc-second: Cass County, Missouri | Elev_MO_CassCounty | -94.6155159863,38.4442430463 to -94.0632319915,38.8487183873 |
| NED 1/9th arc-second: Jackson County, Missouri | Elev_MO_JacksonCounty | -94.6167342191,38.8273278146 to -94.0991724493,39.238037724 |
| NED 1/9th arc-second: Mississippi-Missouri-Illinois Rivers | Elev_MS_MO_IL_Rivers | -97.5001851852,35.9998148139 to -87.9998148148,45.0001851843 |
| NED 1/9th arc-second: Lincoln, Nebraska | Elev_NE_Lincoln | -96.8869299992,40.6174976028 to -96.4858805844,41.0075593624 |
| NED 1/9th arc-second: Camden, New Jersey | Elev_NJ_Camden | -75.1498162299,39.5334499036 to -74.3830260451,40.1922771168 |
| NED 1/9th arc-second: Gloucester County, New Jersey | Elev_NJ_GloucesterCounty | -75.42794,39.51212 to -74.87669,39.88451 |
| NED 1/9th arc-second: Northeastern New Jersey | Elev_NJ_Northeast | -74.6251068115,40.2494316092 to -73.9012179226,41.2049871647 |
| NED 1/9th arc-second: North Carolina | Elev_NC_State | -84.3160108891,33.8406637681 to -75.4613195399,36.5828859876 |
| NED 1/9th arc-second: Southeastern North Dakota | Elev_ND_Southeast | -98.086231,45.590884 to -96.711607,46.499336 |
| NED 1/9th arc-second: Walsh County, North Dakota | Elev_ND_WalshCounty | -98.32075,48.01237 to -97.54317,48.55670 |
| NED 1/9th arc-second: Northern Ohio | Elev_OH_North | -85.00019,39.49981 to -79.99981,42.00019 |
| NED 1/9th arc-second: Sallisaw, Oklahoma | Elev_OK_Sallisaw | -94.9524321681,35.4222253303 to -94.6159506596,35.8121944973 |
| NED 1/9th arc-second: Deschutes River, Oregon | Elev_OR_DeschutesRiver | -122.03093,43.46196 to -120.63080,45.63592 |
| NED 1/9th arc-second: Oregon City, Oregon | Elev_OR_OregonCity | -122.6617280841,45.2875771485 to -122.5170984429,45.3894290085 |
| NED 1/9th arc-second: Portland, Oregon | Elev_OR_Portland | -123.2555734667,45.1977610685 to -122.6229190951,45.9049833473 |
| NED 1/9th arc-second: Sandy River, Oregon | Elev_OR_SandyRiver | -122.4255309074,45.3703191082 to -122.1034938447,45.5746709764 |
| NED 1/9th arc-second: South Fork John Day River, Oregon | Elev_OR_SouthForkJohnDayRiver | -119.6581786709,44.166313266 to -119.3624070423,44.4829182296 |
| NED 1/9th arc-second: Northern South Carolina | Elev_SC_North | -82.33146,33.17728 to -79.06691,35.18652 |
| NED 1/9th arc-second: Lincoln and Minnehaha Counties, South Dakota | Elev_SD_MinnehahaLincolnCounties | -97.12955,43.06334 to -96.43056,43.84949 |
| NED 1/9th arc-second: Missouri River, South Dakota | Elev_SD_MissouriRiver | -100.3691158618,43.0383073468 to -98.508283616,44.3582139831 |
| NED 1/9th arc-second: Aransas and Refugio Counties, Texas | Elev_TX_AransasRefugioCounties | -97.5387651332,27.812484512 to -96.7888885296,28.5625154362 |
| NED 1/9th arc-second: Brazoria County, Texas | Elev_TX_BrazoriaCounty | -95.8750154671,28.8208796004 to -95.0469598453,29.6034413915 |
| NED 1/9th arc-second: Cameron County, Texas | Elev_TX_CameronCounty | -97.87019,25.82873 to -97.13626,26.49997 |
| NED 1/9th arc-second: Chambers County, Texas | Elev_TX_ChambersCounty | -94.9870112096,29.499984541 to -94.3509309119,29.9062500056 |
| NED 1/9th arc-second: Galveston County, Texas | Elev_TX_GalvestonCounty | -95.2344311171,29.0833796215 to -94.3687211714,29.5998920085 |
| NED 1/9th arc-second: Harris County, Texas | Elev_TX_HarrisCounty | -96.00,29.4699999992 to -94.875,30.2199999992 |
| NED 1/9th arc-second: Jackson, Matagorda, and Victoria Counties, Texas | Elev_TX_JacksonMatagordaVictoriaCounties | -97.305602,28.386358 to -95.499985,29.267993 |
| NED 1/9th arc-second: Jefferson County, Texas | Elev_TX_JeffersonCounty | -94.4687651517,29.5604783389 to -93.8332712737,30.2187499965 |
| NED 1/9th arc-second: Kenedy and Kleberg Counties, Texas | Elev_TX_KenedyKlebergCounties | -98.0660093933,26.5914571214 to -97.2179229061,27.6446670821 |
| NED 1/9th arc-second: Texas-Mexico Border North | Elev_TX_MX_Border1 | -100.9326407313,28.7334591071 to -100.4727024229,29.3395085383 |
| NED 1/9th arc-second: Texas-Mexico Border South | Elev_TX_MX_Border2 | -100.5435282004,27.5622726489 to -99.5476021948,28.6968406409 |
| NED 1/9th arc-second: Orange County, Texas | Elev_TX_OrangeCounty | -94.125015,29.966451 to -93.687482,30.250015 |
| NED 1/9th arc-second: San Patricio County, Texas | Elev_TX_SanPatricioCounty | -97.910509,27.812485 to -97.132423,28.187546 |
| NED 1/9th arc-second: Iron County, Utah | Elev_UT_IronCounty | -113.201567,37.621018 to -112.802064,37.882704 |
| NED 1/9th arc-second: Salt Lake City, Utah | Elev_UT_SaltLakeCity | -112.0272069,40.5705428599 to -111.8231328096,40.9043700471 |
| NED 1/9th arc-second: Wasatch County, Utah | Elev_UT_WasatchCounty | -111.507655,40.333920 to -111.282213,40.616041 |
| NED 1/9th arc-second: Chittenden County, Vermont | Elev_VT_ChittendenCounty | -73.3102052565,44.2623421303 to -72.8075508953,44.7301199455 |
| NED 1/9th arc-second: Essex County, Vermont | Elev_VT_EssexCounty | -72.0130308669,44.338706957 to -71.4090493374,45.0423181244 |
| NED 1/9th arc-second: Lake Roosevelt, Washington | Elev_WA_LakeRoosevelt | -118.2336339447,48.47905669 to -117.7202079777,48.9570814196 |
| NED 1/9th arc-second: Mount Saint Helens, Washington | Elev_WA_MtStHelens | -123.0129938272,46.1249999991 to -121.9870061729,46.3999999991 |
| NED 1/9th arc-second: Northwest Washington | Elev_WA_Northwest | -122.8239294251,48.2923610327 to -121.0368613801,49.0107561519 |
| NED 1/9th arc-second: Puget Sound, Washington | Elev_WA_PugetSound | -125.01,46.4899999991 to -121.49,48.5099999991 |
| NED 1/9th arc-second: West Virginia | Elev_WV_State | -83.000185185189991,36.999802029771907 to -77.4998148147981,41.0001851851992 |
| NED 1/9th arc-second: Snake River, Wyoming | Elev_WY_SnakeRiver | -110.77216,43.62502 to -110.46733,43.87395 |
| Best Available Subset | *[Source Layer ID fragment] | Varies |