San Francisco Bay Area Regional Database (BARD)

Using New Header DOQs (keywords) in ARC/INFO and ARCVIEW

You can make use of several utilities for creating .hdr files 
      for  viewing DOQs in ARC/INFO or ARCVIEW.  
You can ftp an AML routine for ARC 7.X from our site. doqnewhdr.aml 
You can ftp a menu driven Windows program(95 or NT). Doq2Arc2.exe
   But, You will need to ftp 3 other files:   1.tb510.dll  
                                              2.xnmba420.dll  
                                              3.xnmte420.dll  
Note: If your browser changes the .dll extension to .exe you 
          must rename them for the program to work.


Here's how to prepare a DOQ to be read into ArcView.  The information you need
for the .hdr file (steps 2 and 3 below) is contained in the header of the DOQ.
You can view this information by opening the DOQ file in a word processor, like
wordpad. You can also create the .hdr file by using one of the utilities I have
included in the links above.  The example used here uses the  "Napa_swm.doq" DOQ.
The header file contained in it is attached below for you to follow along.  


1. Naming of the DOQ image file:
     - use .bil extension for single band gray scale images
     - use .bip extension for 3 band color images 
       example: rename "napa_swm.doq" to "napa_swm.bil"
2. Create a text header file, it must be an ASCII text file:
     - use the same name as the .bil but with a .hdr extension 
       example  "napa_swm.hdr"  
     - be sure the word processor doesn't add ".txt" at the end 
       example  "napa_swm.hdr.txt"  won't work 
3. Add lines to the .hdr text file that contain the following information:

nrows        #number of rows or lines in image
ncols        #number of columns or samples in image
ulxmap       #upper left corner x value of pixel 1,1
ulymap       #upper left corner y value of pixel 1,1
skipbytes    #Number of bytes to skip that make up the header 
xdim 1       #dimension of pixel in x direction
ydim 1       #dimension of pixel in y direction
nbands 1     #number of bands in image, nbands 3 for color images

nrows and ncols are "must have" values.  They are contained in
"SAMPLES_AND_LINES" in the DOQ header (LINES = nrows and SAMPLES = ncols)

ulxmap and ulymap are used to geo-reference the DOQ in UTM coordinates.  
   They are contained in "XY_ORIGIN" in the DOQ header 
   (the first value is X and the second value is Y)

skipbytes is used to avoid display of the header information found at the top of
each DOQ.  This value is called "BYTE_COUNT" in the DOQ header.

xdim and ydim refers to the dimension of the pixels, the default is 1 by 1. 
If you omit the xdim and ydim items you will see no change in your DOQ display.

nbands is 1 if the image is a gray scale image. For a color image nbands is 3 and 
           the extension on the name of the DOQ should be .bip


So napa_swm.hdr looks like this:

nrows 7601
ncols 6221
ulxmap 554240.000
ulymap 4241020.000
skipbytes 6221
xdim 1
ydim 1
nbands 1

The following is the header information from "napa_swm.doq" data file:


BEGIN_USGS_DOQ_HEADER                                                         *
QUADRANGLE_NAME               "NAPA"                                          *
QUADRANT                      SW                                              *
WEST_LONGITUDE                -122 22 30.0                                    *
EAST_LONGITUDE                -122 18 45.0                                    *
NORTH_LATITUDE                  38 18 45.0                                    *
SOUTH_LATITUDE                  38 15  0.0                                    *
PRODUCTION_DATE               1997  9 15                                      *
RASTER_ORDER                  LEFT_RIGHT/TOP_BOTTOM                           *
BAND_ORGANIZATION             "SINGLE FILE"                                   *
BAND_CONTENT                  BLACK&WHITE                                     *
BITS_PER_PIXEL                8                                               *
SAMPLES_AND_LINES             6221  7601                                      *
HORIZONTAL_DATUM              NAD83                                           *
HORIZONTAL_COORDINATE_SYSTEM  UTM                                             *
COORDINATE_ZONE               10                                              *
HORIZONTAL_UNITS              METERS                                          *
HORIZONTAL_RESOLUTION         1.0                                             *
SECONDARY_HORIZONTAL_DATUM    NAD27                                           *
XY_ORIGIN                       554240.000  4241020.000                       *
SECONDARY_XY_ORIGIN             554336.454  4240823.773                       *
NATION                        US                                              *
STATE                         CA                                              *
NW_QUAD_CORNER_XY               554639.911  4240673.227                       *
NE_QUAD_CORNER_XY               560103.961  4240712.028                       *
SE_QUAD_CORNER_XY               560155.516  4233777.073                       *
SW_QUAD_CORNER_XY               554686.779  4233738.292                       *
SECONDARY_NW_QUAD_XY            554641.288  4240466.818                       *
SECONDARY_NE_QUAD_XY            560105.475  4240505.620                       *
SECONDARY_SE_QUAD_XY            560157.029  4233570.810                       *
SECONDARY_SW_QUAD_XY            554688.154  4233532.029                       *
RMSE_XY                          0.987                                        *
IMAGE_SOURCE                  "Black and White film"                          *
SOURCE_IMAGE_ID               "NAPP 6359-203"                                 *
SOURCE_IMAGE_DATE             1993 7 6                                        *
SOURCE_DEM_DATE               1980 1 1                                        *
AGENCY                        "WESTERN MAPPING CENTER (WMC)"                  *
PRODUCER                      "Hammon, Jensen, Wallen & Associates"           *
PRODUCTION_SYSTEM             "ORTHOVIEW"                                     *
STANDARD_VERSION              1996 12                                         *
METADATA_DATE                 1997  9 15                                      *
DATA_FILE_SIZE                  47292042                                      *
BYTE_COUNT                      6221                                          *

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