GeoExpress reads and maintains accurate georeferencing for images in USGS DOQ format. DOQ files contain metadata information in an ASCII header file contained within the file.
GeoExpress can read images in both old and new DOQ header formats. The less common “exponential” DOQ header format is not supported.
The following is an example of the current standard USGS DOQ header format:
BEGIN_ USGS_ DOQ_ HEADER *
QUADRANGLE_ NAME “QUINCY WEST” 3.75 or 7.5-min. name*
QUADRANT NE quadrant indicator if cell size = 3.75minutes*
WEST_ LONGITUDE -91 26 15.000 signed deg., min. & sec.*
EAST_ LONGITUDE -91 22 30.000 signed deg., min. & sec.*
NORTH_ LATITUDE 40 0 0.000 signed deg., min. & sec.*
SOUTH_ LATITUDE 39 56 15.000 signed deg., min. & sec.*
PRODUCTION_ DATE 1995 07 13 yyyy mm dd*
RASTER_ ORDER LEFT_ RIGHT/TOP_ BOTTOM video display order*
BAND_ ORGANIZATION SINGLE FILE single file or BSQ, or BIL or BIP*
BAND_ CONTENT BLACK& WHITE black& white or red green blue*
BITS_ PER_ PIXEL 8 *
SAMPLES_ AND_ LINES 6076 7641 number of columns and rows*
HORIZONTAL_ DATUM NAD83 primary horizontal datum*
HORIZONTAL_ COORDINATE_ SYSTEM UTM *
COORDINATE_ ZONE 15 coordinate system zone number*
HORIZONTAL_ UNITS METERS coordinate system units*
HORIZONTAL_ RESOLUTION 1.0 coordinate system geometric resolu. in horiz. units*
SECONDARY_ HORIZONTAL_ DATUM NAD27 secondary horizontal datum*
XY_ ORIGIN 633063.000 4429328.000 coord.of upper left pixel-pri. datum*
SECONDARY_ XY_ ORIGIN 633079.000 4429113.000 coor.-upper left pixel-sec datum*
NATION USnation code*
STATE IL state fips codes*
STATE MO state fips codes*
NW_ QUAD_ CORNER_ XY 633377.438 4428926.385 X-Y coords. of pri. NW quad corner*
NE_ QUAD_ CORNER_ XY 638712.782 4429021.805 X-Y coords. of pri. NE quad corner*
SE_ QUAD_ CORNER_ XY 638839.205 4422084.460 X-Y coords. of pri. SE quad corner*
SW_ QUAD_ CORNER_ XY 633498.995 4421989.077 X-Y coords. of pri. SW quad corner*
SECONDARY_ NW_ QUAD_ XY 633380.942 4428716.377 X-Y coords. -sec. NW quad cor.*
SECONDARY_ NE_ QUAD_ XY 638716.426 4428811.800 X-Y coords. -sec. NE quad cor.*
SECONDARY_ SE_ QUAD_ XY 638842.847 4421874.579 X-Y coords. -sec. SE quad cor.*
SECONDARY_ SW_ QUAD_ XY 633502.497 4421779.193 X-Y coords. -sec. SW quad cor.*
RMSE_ XY 0.82 doq horiz.accuracy*
IMAGE_ SOURCE ìblack & white film b& w, color, infrared or other*
SOURCE_ IMAGE_ ID NAPP 2231-2" source image identification*
SOURCE_ IMAGE_ DATE 1991 03 24 source image date as yyyy mm dd*
SOURCE_ DEM_ DATE 1995 07 00 source DEM date*
AGENCY WesternMappingCenter (WMC) name of oversight agency*
PRODUCER WesternMappingCenter (WMC) name of DOQ producer*
PRODUCTION_ SYSTEM ìDV1.2 03/ 93 OV1.1 04/ 93” name of the production HW & SW*
STANDARD_ VERSION 1996 12 version of DOQ standard*
METADATA_ DATE 1996 7 13 date created or changed, yyyy mm dd*
DATA_ FILE_ SIZE 46432792 data set size in bytes*
BYTE_ COUNT 6076 header byte count*
*
*
END_ USGS_ HEADER *