Identification Information

Title MRCOG 2010 Sandoval County Digital Orthophotography Mosaic

Date 2023-05-19

Date Type Publication

Cited Responsible Party

Organization Name Bohannan-Huston, Inc.

Role identify

Presentation Form raster digital data

Abstract This image is a mosaic of orthophotography covering Sandoval County. The project is known as the 2010 Digital Orthophotography and Elevation Data project. The project was begun and completed in 2010. The overlapped tiles of orthophotography are images which depict color digital aerial photographs acquired in the spring of 2010 during leaf-off conditions and in the early summer of 2010 over the mountainous areas to minimize snow cover. Lens and terrain distortion have been removed and tonal differences between adjacent images have been minimized to form a mosaic of the entire project area. The project area includes the Albuquerque Metropolitan area and both Western Plains, Central Mountains, and Rio Grande River Valley adjacent to the metro area. Orthorectified imagery is assumed to depict features at ground level, so above ground features may show some distortion from elevation. The only exceptions to this are bridges and elevated roads, which have been checked for distortion and true orthorectified when distortion was encountered. Each orthorectified pixel is exactly one half foot square throughout the project areas. Quality and accuracy of this orthophotography was evaluated with control independent from the photogrammetric solutions. The image products conform to American Society for Photogrammetry and Remote Sensing (ASPRS) Class I Standards for 1"=200' horizontal mapping. Project coordinate systems were based off the New Mexico State Plane Central Zone projection with the horizontal datum North American Datum 1983 (1992)/HARN and vertical datum North American Vertical Datum 1988 and units of US Survey Feet. Transformed projections and datums available in this project include Universal Transverse Mercator Zone 13 NAD83 (1992)/HARN, Meters.

Purpose The orthophotography is useful as a layer in a Geographic Information System (GIS) or in CAD environments and is intended to aid in planning, digital map revision, position representation, and spatial analysis. It is not intended to furnish measurements accurate enough for engineering design work.

Supplemental Information The orthophotography is also available in compressed ERDAS ER Mapper ECW and MrSID file formats.

Data Set Credit A consortium of 16 governmental and private partners headed by the Mid Region Council of Governments.

Status Complete

Point of Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

Maintenance and Update Frequency None planned

Descriptive Keywords aerial photographs, aerial photos, air photos, orthoimagery, orthophotographs, photography, remote sensing, mosaic

Access Constraints None.

Use Constraints Neither EDAC/RGIS, the MRCOG, nor Bohannan-Huston, Inc. (BHI) assumes liability for misuse of the data. Data should be used at the scale for which they were intended. No warranty, expressed, or implied, is made by EDAC/RGIS, MRCOG nor BHI regarding the utility of the data on any other system, nor shall the act of distribution constitute such warranty.

Language English

Topic Category imageryBaseMapsEarthCover

Extent

Geographic Bounding Box

West Bound -107.207763
East Bound -106.249128
North Bound 35.635785
South Bound 35.207865

Temporal Extent

Beginning Position 2010-03-12
Ending Position 2010-05-21

Data Quality Information

Attribute Accuracy Report

Report This raster data set contains no attribute data.

Quantitative Attribute Accuracy Assessment

Attribute Accuracy Value
Attribute Accuracy Explanation

Horizontal Positional Accuracy Report

Report The horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process (elevation data, aerotriangulation control and methods, camera calibration, and source imagery parameters). These parameters are reviewed post orthorectification against the output imagery and initially validate the product is in compliance with ASPRS standards. Additionally, NSDI Part 3 Chapter 3 - (http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/chapter3) outlines process for determining horizontal RMSE and 95% confidence level for accuracy. Data deemed useful for this validation include independent higher accuracy geodetic control, GPS ground surveys, photogrammetric methods, and databases of high accuracy point coordinates. Check point locations are generally distributed more densely in the vicinity of important features and more sparsely in areas that are of little or no interest. This data set has uniform positional accuracy thus the points are spaced so 20% of the check points are located in each quadrant of the dataset. Tested 2.31 feet horizontal accuracy at 95% confidence level.

Quantitative Horizontal Positional Accuracy Assessment

Horizontal Positional Accuracy Value 0
Horizontal Positional Accuracy Explanation This value was validated with NSDI processes defined in part3 Chapter 3 - National Standard for Spatial Data Accuracy. ASPRS Class 1 Mapping Standards for 1"= 200' horizontal require an RMSE of 2.0' be achieved. Control points that were used to aerotriangulate the positions of the images at time of exposure were identified in the orthorectified images and found to be displaced not more than three pixels. All other ground features therefore should not be displaced from their true locations by more than an average of three pixels. Features not on the ground, such as building rooftops or trees, may be displaced.

Vertical Positional Accuracy Report

Report Vertical accuracy does not apply to the orthophotography data set.

Quantitative Vertical Positional Accuracy Assessment

Vertical Positional Accuracy Value
Vertical Positional Accuracy Explanation

Logical Consistency Report Horizontal accuracy of all ground control visible in imagery shows a displacement of not more than three pixels (one and a half feet). Color balance is consistent across the project.

Completeness Report Aerotriangulation results for all raw imagery was checked for horizontal accuracy. All visible control points were checked in orthorectified imagery for horizontal accuracy. All bridges were checked for warping during the orthorectification process and corrected. All imagery was checked for consistency of color balance across the entire project area. Twenty percent of final tiles were chosen at random for total visual inspection at full resolution to determine frequency of misplaced seamlines and other potential quality issues.

Lineage

Source Information

Source Citation

Source Scale Denominator 12400

Type of Source Media disc

Source Time Period of Content

Beginning Position 2010-03-12
Ending Position 2010-05-21
Source Currentness Reference ground condition

Source Citation Abbreviation IMAGE

Source Contribution Raw aerial image data was captured and controlled using an Zeiss/Intergraph Digital Mapping Camera (DMC) system having a focal length of 120mm, an effective charge coupled device (CCD) array size of 168mm across track (left to right) by 95mm along track (top to bottom), and a pixel size in its panchromatic band of 12 by 12 microns. Multiple DMC sensors where used on this project.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media disc

Source Time Period of Content

Beginning Position 2010-03-12
Ending Position 2010-05-21
Source Currentness Reference ground condition

Source Citation Abbreviation ABGPSIMU

Source Contribution Airborne GPS positions and Intertial Measurement Unit attitudes were computed by the acquisition company and used as control in the aerotriangulation process.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media disc

Source Time Period of Content

Beginning Position 2010-03-12
Ending Position 2010-05-06
Source Currentness Reference ground condition

Source Citation Abbreviation DEM

Source Contribution Elevation data derived from two sources was used as input to provide ground elevations for the orthorectification process. Primary source of elevation data comes from a LiDAR aerial survey conducted with the 2010 Digital Orthophotography and Elevation Data project. The secondary source of DEM was existing elevation models built from previous LiDAR projects and autocorrelation techniques. The DEM data (elevation data) is suitable for most terrain analysis applications with the exception of engineering design.

Process Step

Process Description Ground Control targets (panels) were laid down at predetermined locations and their positions recorded with static GPS. Positions were then corrected and network adjusted via the federal government Online Positioning User System (OPUS) to the project coordinate system. Other methodology included RTK GPS techniques corrected with the local Vectors network subscription. All control related processes and metrics are recorded in the project survey control report. Project coordinate systems were based off the New Mexico State Plane Central Zone projection with the horizontal datum North American Datum 1983 (1992)/HARN and vertical datum North American Vertical Datum 1988 and units of US Survey Feet. Transformed projections and datums used in this project include Universal Transverse Mercator Zone 13 NAD83, Meters.

Process Date 2010

Process Time

Process Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

Process Step

Process Description Raw image data was captured using up to three Intergraph Digital Mapping Cameras (DMCs) having a focal length of 120mm, an effective charge coupled device (CCD) array size of 168mm across track (left to right) by 95mm along track (top to bottom), and a pixel size in its panchromatic band of 12 by 12 microns. Output images were created using post-processing software which removes lens distortion and pan-sharpens color data with a panchromatic image taken at the same instant. Each image had its histogram clipped to optimize contrast, and was sliced to reduce it from a 12 bit image (4096 values per band) to an 8 bit image (256 values per band).

Process Date 2010

Process Time

Process Contact

Individual Name

Organization Name Surdex Corporation

Position Name

Role Point of contact

Voice 636-368-4400

Facsimile

Address

Delivery Point 520 Spirit of St. Louis Blvd.
City Chesterfield
Administrative Area MO
Postal Code 63005
Country USA

Electronic Mail Address info@surdex.com

Process Step

Process Description Airborne GPS/IMU data were collected in flight as images were captured and post-processed and network adjusted.

Process Date 2010

Process Time

Process Contact

Individual Name

Organization Name Surdex Corporation

Position Name

Role Point of contact

Voice 636-368-4400

Facsimile

Address

Delivery Point 520 Spirit of St. Louis Blvd.
City Chesterfield
Administrative Area MO
Postal Code 63005
Country USA

Electronic Mail Address info@surdex.com

Process Step

Process Description Images were aerotriangulated to finalize their external orientation. Intergraph ISAT and GeoMedia Pro were used to perform digital point matching/mensuration/block adjustments and quality control queries respectively. Final block adjustments were evaluated at sub pixel accuracy. Processing was completed May - August 2010.

Process Date 2010

Process Time

Process Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

Process Step

Process Description Images were orthorectified to remove distortions caused by changes in the elevation of the terrain. The orthorectification process used an exponential interpolation method and a ground elevation sampling interval of thirty two pixels. Intergraph ISBR was employed for the orthorectification.

Process Date 2010-08

Process Time

Process Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

Process Step

Process Description Images were color balanced and color corrected individually to ensure color consistency between flight lines, times of day, and dates of capture.

Process Date 2010-08

Process Time

Process Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

Process Step

Process Description Images were mosaiced into large aggregate tiles and automatic seamlines were used to combine the most nadir components of individual images.

Process Date 2010-08

Process Time

Process Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

Process Step

Process Description Aggregate tiles were again tonally balanced and color corrected with the entire project in view. A second global color adjustment was performed to minimize color changes across images. Project deliverable tiles were cut from the mosaic and formatted for delivery.

Process Date 2010-08

Process Time

Process Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

Process Step

Process Description Images were checked for errors. All identified errors were corrected and the image tile re-created. Above ground features obscuring ground features such as excessive building lean were corrected by replacing the building with less distorted versions from overlapping unrectified photos. Obvious color differences that remained between source images were feathered. Twenty percent of images selected at random were reviewed at full resolution for any other issues.

Process Date 2010-08

Process Time

Process Contact

Individual Name

Organization Name Bohannan-Huston, Inc.

Position Name Senior Vice President & Managing Principal

Role Point of contact

Voice 505-798-7925

Facsimile 505-798-7932

Address

Delivery Point 7500 Jefferson St NE
Delivery Point Courtyard I
City Albuquerque
Administrative Area NM
Postal Code 87109-4335
Country USA

Electronic Mail Address dsandin@bhinc.com

MRCOG 2010 Sandoval County Digital Orthophotography Mosaic

Metadata from the RGIS Metadata Repository

Identification Information

Distribution Information

Spatial Reference Information

Data Quality Information

Metadata Reference Information