User's Guide

DOQ2GEOTIFF

Convert a Digital Orthophoto Quadrangle (DOQ) to a GeoTIFF image.

Function:

Convert a new or old format Digital Orthophoto Quadrangle (DOQ) image disk file to GeoTIFF format.

Parameters:

INFILE

The name of the DOQ file. The DOQ must conform to the published USGS standards. See User Note 1. No windowing or sub-banding is allowed.

DATUM

Datum to use for output image. The (new) DOQ format contains coordinate information based on both the NAD27 and NAD83 datums. The user may select which datum to use for the output image.

OUTFILE

The output GeoTIFF file. This file will be created using the directory and filename specified. If an extension is not specified then .tif will be used.

WOPT("NO" )

Flag indicating if the ascii world file should be created. See User Note 2.

Examples:

1. LAS> doq2geotiff infile=/sg1/csb/fsd.doq datum=nad27 outfile=/sg1/csb/fsd_out wopt="yes"

   The input DOQ file fsd.doq located in directory /sg1/csb will be converted to the GeoTIFF file fsd_out.tif. The output GeoTIFF file will be located in the directory /sg1/csb. Datum NAD27 will be used. The world file fsd_out.tfw will be created.

2. LAS> doq2geotiff infile=fsd.doq datum=nad83 outfile=fsd_out.tif

   The input DOQ file fsd.doq will be converted to the GeoTIFF file fsd_out.tif. Both the infile and outfile are located in the current working directory. Datum NAD83 will be used. A world file will not be created.

Description/Algorithm:

The input DOQ file will be converted to a LAS image using the routine doq2las. This LAS image will be converted to the output GeoTIFF file by using las2geotiff. The intermediate LAS files will be deleted.

Nonfatal Error Messages:

1. [informational] Deleting intermediate LAS files

   After doq2las has run successfully, this informational message is displayed to let the user know that the LAS files are going to be deleted. The intermediate LAS file names will be displayed by cmdel.

2. [informational] Deleting files created by this application

   If a fatal error occurs during processing and DELFLG is set to "yes", then this informational message is displayed to let the user know that the files just created will be removed. The file names will be displayed by cmdel.

Fatal Error Messages:

1. [doq2geotiff-fatal] Fatal error encountered

   A fatal error was encountered during processing. The error message that is displayed immediately preceding this message is the specific error that was encountered.

User Notes:

1. This application calls doq2las then las2geotiff. Refer to the User Notes for these applications.

2. The world file contains the geographic affine transformation values.