Keys to the USGS Seamless datasets:

Example:
http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=36.17,36.16,-115.16,-115.17&PL=LS702HZ

http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=36.17,36.16,-120.00,-121.00&PL=LS702HZ


NED03HZ...National Elevation Dataset (NED) 1 Arc Second
Output Format: BIL
NAD 83 Geographic

ND303HZ...National Elevation Dataset (NED) 1/3 Arc Second
Output Format: BIL
NAD 83 Geographic

ND903HZ...National Elevation Dataset (NED) 1/9 Arc Second (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: BIL
NAD 83 Geographic

SM303HZ...SRTM 1 arc sec - Shuttle Radar Topography Mission [Finished]
Output Format: BIL
WGS 1984 Geographic

SM903HZ...SRTM 3 arc sec - Shuttle Radar Topography Mission [Finished]
Output Format: BIL
WGS 1984 Geographic

QCE02HZ...DOQQ 1.0m Color - UTM Zone 10 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF
NAD 83 UTM Zone 10N

QCF02HZ...DOQQ 1.0m Color - UTM Zone 11 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF
NAD 83 UTM Zone 11N

QCB02HZ...DOQQ 1.0m Color - UTM Zone 18 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF
NAD 83 UTM Zone 18N

QBK02HZ...DOQQ 1.0m B&W - UTM Zone 11 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF
NAD 83 UTM Zone 11N

DGS02HZ...24k DRG (California) - UTM Zone 10 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF 
NAD_1927_California_Teale_Albers 
X cell Size: 01.524 Meters 
Y cell Size: 01.524 Meters 

DGA02HZ...24k DRG - UTM Zone 10 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF
NAD 27 UTM Zone 10N

DGB02HZ...24k DRG - UTM Zone 11 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF
NAD 27 UTM Zone 11N

DGI02HZ...24k DRG - UTM Zone 18 (not available everywhere: "There are no available products in the area that you indicated.")
Output Format: GeoTIFF
NAD 27 UTM Zone 18N

F0J02HZ...LANDFIRE 13 Anderson Fire Behavior Fuel Models
Output Format: GeoTIFF
USA Contiguous Albers Equal Area Conic USGS version
X cell Size: 30.00 METERS
Y cell Size: 30.00 METERS

F0K02HZ...LANDFIRE 40 Scott and Burgan Fire Behavior Fuel Models
Output Format: GeoTIFF
USA Contiguous Albers Equal Area Conic USGS version
X cell Size: 30.00 METERS
Y cell Size: 30.00 METERS

LS702HZ...Landsat Mosaic
Output Format: GeoTIFF
NAD 83 Geographic
X cell Size: 00.00028 Degrees
Y cell Size: 00.00028 Degrees

IC302HZ...National Atlas Forest Cover Types
Output Format: GeoTIFF
National Atlas Albers
X cell Size: 1,000.00 Meters
Y cell Size: 1,000.00 Meters

ICA02HZ...National Atlas Nighttime Lights
Output Format: GeoTIFF
National Atlas Albers
X cell Size: 769.478 Meters
Y cell Size: 769.478 Meters

ICN03HZ...National Atlas North American Atlas - Bathymetry
Output Format: BIL
National Atlas Albers
X cell Size: 1,000.00 METERS
Y cell Size: 1,000.00 METERS

ICL02HZ...National Atlas Ocean Depth - Bathymetry
Output Format: GeoTIFF
National Atlas Albers
X cell Size: 3,107.68022 METERS
Y cell Size: 3,107.68022 METERS

IB904HZ...National Atlas Streams
Output Format: Shapefile
NAD 83 Geographic

V2202HZ...Jan 2006 Color Orthoimagery - Los Angeles County, CA
Output Format: GeoTIFF
NAD 83 UTM Zone 11N
X cell Size: 00.3048 Meters
Y cell Size: 00.3048 Meters

BTS04HZ...Bureau of Transportation Statistics (BTS) Roads
(WGS 84)
Output Format: Shapefile
NAD 83 Geographic

IB704HZ...National Atlas Railroads
(WGS 84)
Output Format: Shapefile
NAD 83 Lambert Conformal Conic

IB104HZ,IBA04HZ,IAA04HZ...National Atlas Waterbodies
(WGS 84)
Output Format: Shapefile
NAD 83 Geographic

IB804HZ...National Atlas Roads
(WGS 84)
Output Format: Shapefile
NAD 83 Geographic

u1o02HZ...Mar 2005 Color Orthoimagery - Washington, DC
(WGS 84)
Output Format: GeoTIFF
NAD 83 State Plane Maryland FIPS 1900
X cell Size: 00.16 Meters
Y cell Size: 00.16 Meters

DOQ02HZ...Sep 2005 Color Orthoimagery - Washington, DC
(WGS 84)
Output Format: GeoTIFF
NAD 83 UTM Zone 18N
X cell Size: 00.50 Meters
Y cell Size: 00.50 Meters

http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=39.0,38.9,-76.9,-77.0&CS=250&PR=0&PL=DFI02HZ
DFI02HZ...100k DRG - UTM Zone 18
(WGS 84)
Output Format: GeoTIFF
NAD 27 UTM Zone 18N
X cell Size: 10.16 Meters
Y cell Size: 10.16 Meters

http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=39.0,38.9,-76.9,-77.0&CS=250&PR=0&PL=DER02HZ
DER02HZ...250k DRG - UTM Zone 18
Output Format: GeoTIFF
NAD 27 UTM Zone 18N
X cell Size: 25.40 Meters
Y cell Size: 25.40 Meters

########################################################################################################################
Working URL:

querySeamless.Format("http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=7  &key=SM3&ras=1&rsp=1&pfm=BIL      &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=%f     &rgt=%f     &top=%f    &bot=%f    &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=SRTM1FIN  &mdf=HTML&arc=ZIP&sde=SRTM.C_US_1_ELEVATION_SHIFT                                    &msd=SRTM.c_national_1_elevation_meta&zun=      &prj=0&csx=0.0002777777778      &csy=0.0002777777778      &bnd=&bndnm=&RC=%s",
########################################################################################################################
Proposed URL for "National Elevation Dataset (NED) 1 Arc Second":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=1  &key=NED&ras=1&rsp=1&pfm=BIL      &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=NED_&lft=-115.17&rgt=-115.16&top=36.17 &bot=36.16 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=NED       &mdf=HTML&arc=ZIP&sde=NED.conus_ned                                                  &msd=NED.CONUS_NED_METADATA          &zun=METERS&prj=0&csx=2.777777777999431E-4 &csy=2.777777777999431E-4 &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "Landsat Mosaic":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=52 &key=LS7&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-121.00&rgt=-120.00&top=40.00 &bot=39.00 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=L7        &mdf=HTML&arc=ZIP&sde=WEBMAP.LANDSAT_LZ77                                            &msd=                                &zun=NULL  &prj=0&csx=2.7777000000000005E-4&csy=2.7777000000000005E-4&bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "DOQQ 1.0m B&W - UTM Zone 11":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=7  &key=QBK&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-117.92&rgt=-117.90&top=33.81 &bot=33.78 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=DOQQBW    &mdf=HTML&arc=ZIP&sde=DOQQ.DOQQ_035_BW                                               &msd=DOQQ.doqqbw_meta                &zun=null  &prj=0&csx=1.0                  &csy=1.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "DOQQ 1.0m Color - UTM Zone 11":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=26 &key=QCF&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-118.31&rgt=-118.29&top=34.13 &bot=34.11 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=DOQQ      &mdf=HTML&arc=ZIP&sde=DOQQ.DOQQ_034                                                  &msd=DOQQ.doqq_meta                  &zun=null  &prj=0&csx=1.0                  &csy=1.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "Jan 2006 Color Orthoimagery - Los Angeles County, CA":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=36 &key=V22&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-118.30&rgt=-118.29&top=34.12 &bot=34.11 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=ST_104_003&mdf=HTML&arc=ZIP&sde=ORTHO_ST.ST_ORTHO_104_005                                      &msd=                                &zun=null  &prj=0&csx=0.3048               &csy=0.3048               &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "National Atlas Streams":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=1  &key=IB9&ras=0&rsp=0&pfm=Shapefile&imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-118.30&rgt=-118.29&top=34.12 &bot=34.11 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=IB9       &mdf=HTML&arc=ZIP&sde=ATLAS.atlas_streams_waterbodies_l                              &msd=null                            &zun=null  &prj=0&csx=0.0                  &csy=0.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "Bureau of Transportation Statistics (BTS) Roads":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=1  &key=BTS&ras=0&rsp=0&pfm=Shapefile&imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-118.33&rgt=-118.21&top=34.14 &bot=34.05 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=BTS       &mdf=HTML&arc=ZIP&sde=webmap.bts_roads                                               &msd=                                &zun=null  &prj=0&csx=0.0                  &csy=0.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "National Atlas Railroads":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=1  &key=IB7&ras=0&rsp=0&pfm=Shapefile&imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-118.33&rgt=-118.21&top=34.14 &bot=34.05 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=IB7       &mdf=HTML&arc=ZIP&sde=ATLAS.atlas_railroad                                           &msd=null                            &zun=null  &prj=0&csx=0.0                  &csy=0.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "National Atlas Waterbodies":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=1  &key=IBA&ras=0&rsp=0&pfm=Shapefile&imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-118.33&rgt=-118.21&top=34.14 &bot=34.05 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=IBA       &mdf=HTML&arc=ZIP&sde=ATLAS.atlas_streams_waterbodies_p                              &msd=null                            &zun=null  &prj=0&csx=0.0                  &csy=0.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "National Atlas Roads":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=1  &key=IB8&ras=0&rsp=0&pfm=Shapefile&imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-118.33&rgt=-118.21&top=34.14 &bot=34.05 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=IB8       &mdf=HTML&arc=ZIP&sde=ATLAS.atlas_roads                                              &msd=null                            &zun=null  &prj=0&csx=0.0                  &csy=0.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "National Elevation Dataset (NED) 1/9 Arc Second":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=1  &key=ND9&ras=1&rsp=1&pfm=BIL      &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-76.5  &rgt=-76.475&top=38.99 &bot=38.97 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=NED19     &mdf=HTML&arc=ZIP&sde=NED.CONUS_NED_19_MD                                            &msd=NED.conus_ned_19_metaplygn      &zun=METERS&prj=0&csx=3.08641975309901E-5  &csy=3.08641975309901E-5  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "Mar 2005 Color Orthoimagery - Washington, DC":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=140&key=u1o&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-77.039&rgt=-77.034&top=38.899&bot=38.895&wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=UA_346_06 &mdf=HTML&arc=ZIP&sde=WEBMAP.UA_ORTHO_346_06                                         &msd=                                &zun=null  &prj=0&csx=0.16                 &csy=0.16                 &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "QCB02HZ...DOQQ 1.0m Color - UTM Zone 18" (Washington, DC):

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=163&key=QCB&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-76.9  &rgt=-76.85 &top=39.1  &bot=39.05 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=DOQQ      &mdf=HTML&arc=ZIP&sde=DOQQ.DOQQ_281                                                  &msd=DOQQ.doqq_meta                  &zun=null  &prj=0&csx=1.0                  &csy=1.0                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "Sep 2005 Color Orthoimagery - Washington, DC:

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=157&key=u1s&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-77.1  &rgt=-77.05 &top=38.85 &bot=38.825&wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=UA_346_05 &mdf=HTML&arc=ZIP&sde=WEBMAP.UA_ORTHO_346_05                                         &msd=                                &zun=null  &prj=0&csx=0.5                  &csy=0.5                  &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "24k DRG - UTM Zone 18":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=85 &key=DGI&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-77.18 &rgt=-77.11 &top=39.01 &bot=38.90 &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=DRG24kZ18 &mdf=HTML&arc=ZIP&sde=DRG.Z18_24                                                     &msd=DRG.Z18_24_meta                 &zun=null  &prj=0&csx=2.4384               &csy=2.4384               &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "DFI02HZ...100k DRG - UTM Zone 18":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=108&key=DFI&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-77.0  &rgt=-76.9  &top=39.0  &bot=38.9  &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=DRG100kZ18&mdf=HTML&arc=ZIP&sde=DRG.Z18_100                                                    &msd=DRG.Z18_100_meta                &zun=null  &prj=0&csx=10.16                &csy=10.16                &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "DER02HZ...250k DRG - UTM Zone 18":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=3  &key=DER&ras=1&rsp=0&pfm=GeoTIFF  &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-77.0  &rgt=-76.9  &top=39.0  &bot=38.9  &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=DRG250kZ18&mdf=HTML&arc=ZIP&sde=DRG.Z18_250                                                    &msd=DRG.Z18_250_meta                &zun=null  &prj=0&csx=25.4                 &csy=25.4                 &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "ND303HZ...National Elevation Dataset (NED) 1/3 Arc Second":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=47 &key=ND3&ras=1&rsp=1&pfm=BIL      &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-77.3  &rgt=-76.8  &top=39.1  &bot=38.7  &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=NED13     &mdf=HTML&arc=ZIP&sde=NED.conus_ned_13e                                              &msd=NED.CONUS_NED_13_METADATA       &zun=METERS&prj=0&csx=9.259259260000041E-5 &csy=9.259259260000041E-5 &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################
Proposed URL for "SM903HZ...SRTM 3 arc sec - Shuttle Radar Topography Mission [Finished]":

                      http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=83 &key=SM9&ras=1&rsp=1&pfm=BIL      &imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=    &lft=-125.0 &rgt=-119.5 &top=42.0  &bot=37.0  &wmd=1&mur=http://extract.cr.usgs.gov/distmeta/servlet/gov.usgs.edc.MetaBuilder&mcd=SRTM3FIN  &mdf=HTML&arc=ZIP&sde=SRTM.C_1TO19_3_ELEVATION_SHIFT, SRTM.C_20TO43_3_ELEVATION_SHIFT&msd=SRTM.c_world_3_elevation_meta   &zun=      &prj=0&csx=8.333333332999158E-4 &csy=8.333333332999158E-4 &bnd=&bndnm=&RC=e8b07f8e39b168d22eb287729c18b7ebd62a54
########################################################################################################################


White House, maximum resolution:
http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=38.899,38.895,-77.034,-77.039&CS=250&PR=0&PL=ND303HZ,u1o02HZ
########################################################################################################################
http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=39.1,39.0,-77.2,-77.3&PL=NED03HZ
http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=38.899,38.895,-77.034,-77.039&PL=DOQ02HZ
########################################################################################################################
