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Identification Information

Title

NAIP 2019 DOQQ Download

Date

2020-04-21

Date Type

publication

Edition

Organization Name

U.S. Geological Survey

Role

originator

Presentation Form

mapDigital

Abstract

2019 Digital Orthophotos Quarter-Quads downloadable as JPEG compressed geotiffs. CS: EPSG 4326 LL WGS84 ************************************************************* Digital Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a 1-meter ground resolution, quarter-quadrangle (3.75-minutes of latitude by 3.75-minutes of longitude) image cast on the Universal Transverse Mercator Projection (UTM) on the North American Datum of 1983 (NAD83).The geographic extent of the DOQ is equivalent to a quarter-quad plus The overedge ranges a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The overedge is included to facilitate tonal matching for mosaicking and for the placement of the NAD83 and secondary datum corner ticks. The normal orientation of data is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of the lines from north to south. The standard, archived digital orthophoto is formatted as four ASCII header records, followed by a series of 8-bit binary image data records. The radiometric image brightness values are stored as 256 gray levels ranging from 0 to 255. The metadata provided in the digital orthophoto contain a wide range of descriptive information including format source information, production instrumentation and dates, and data to assist with displaying and georeferencing the image. The standard distribution format of DOQs will be JPEG compressed images on CD-ROM by counties or special regions. The reconstituted image from the CD-ROM will exhibit some radiometric differences when compared to its uncompressed original but will retain the geometry of the uncompressed DOQ. Uncompressed DOQs are distributed on tape.

Purpose

DOQ's serve a variety of purposes, from interim maps to field references for earth science investigations and analysis. The DOQ is useful as a layer of a geographic information system and as a tool for revision of digital line graphs and topographic maps.

Status

onGoing

Descriptive Keywords

rectified photograph, DOQQ, 7.5- x 7.5-minute orthophoto, 1-meter orthophoto, digital orthophotoquad, aerial photograph, 2-meter orhtophoto, orthophoto, 3.75- x 3.75-minute orthophoto, rectified image, DOQ, quarter-quadrangle orthophoto, digital image map, digital orthophoto, Land Grids, quarter-quad, FIPS code of State or Province, FIPS code for county or counties., OK, US

Access Constraints

otherRestrictions

Other Constraints

access constraints: None

Use Constraints

otherRestrictions

Other Constraints

Language

eng

Topic Category Code

Geographic Bounding Box

	North bound latitude
	37.00
West bound longitude		East bound longitude
-103.125		-94.375
	South bound latitude
	33.50

Distribution Information

Name	USGS_DOQ
Version	unknown
Individual Name
Organization Name	OK Office of Geographic Information
Position Name
Voice	405-521-4813
Facsimile
Address
City	Oklahoma City
State	OK
Postal Code	73105
Country
Electronic mail address
Hours of Service	0800-1600
Role	pointOfContact
Fees
Ordering Instructions
Transfer Size	5

Spatial Representation Information

Geometric Object Type	complex
Geometric Object Count	5048

Reference System

Code

Data Quality

Evaluation Method
Topological Consistency
Absolute Positional Accuracy	The DOQ horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process. These inputs consist of the digital elevation model (DEM),aerotriangulation control and methods, the photo source camera calibration, scanner calibration, and aerial photographs that meet National Aerial Photography Program (NAPP) standards. The vertical accuracy of the verified USGS format DEM is equivalent to or better than a USGS level 1 or 2 DEM, with a root mean square error (RMSE) of no greater than 7.0 meters. Field control is acquired by third order class 1 or better survey methods sufficiently spaced to meet National Map Accuracy Staandards (NMAS) for 1:12,000-scale products. Aerial cameras have current certification from the USGS, National Mapping Division, Optical Science Laboratory. Test calibration scans are performed on all source photography scanners.
Attribute Accuracy	During photographic reproduction of the source photography, limited analog dodging is performed to improve image quality. Analog dodging consists of holding back light from certain areas of the sensitized photographic material to avoid overexposure. The diapositive is inspected to insure clarity and radiometric uniformity. Diapositive image brightness values are collected with a minimum of image quality manipulation. Image brightness values may deviate from brightness values of the original imagery due to image value interpolation during the scanning and rectification processes. Radiometry is verified by visual inspection of the digital orthophoto quadrangle with the original unrectified image to determine if the digital orthophoto has the same or better image quality as the original unrectified input image. Slight systematic radiometric differences can be detected between adjacent DOQ files due primarily to differences in source photography capture dates and sun angles of aerial photography along flight lines. These differences can be observed in an image's general lightness or darkness when compared to adjacent DOQ file coverages.
Process Step	Metadata imported.
Source	Elevation data in the form of an ortho-DEM regridded to user-specified intervals and bounds.
Responsible Party	U.S. Geological Survey
Role	originator

Metadata

Metadata Standard	ISO 19115:2003/19139
Version	1.0