Originator

MARKHURD

Abstract

This Dataset contains 267 black and white, Color, and Color Infrared orthophoto quarter-quadrangles (DQQs), 3.75' x 3.75' covering the 7 county Twin Cities (Minneapolis and St. Paul) Metropolitan Area in Minnesota. A quarter-quadrangle is included if it coverage includes any portion of the Twin cities 7 county area. The orthophotos are in UTM, Zone 15, NAD83 projection. Each black and white image is approximately 115Mb with a 0.6 meter image pixel (2 ft) in TIFF and MrSid format. The color and CIR images are approximately 350 Mb with a 0.6 meter pixel (2 ft) in TIFF and MrSid format. These orthophotos were produced using the USGS DOQ specifications except for file format and pixel size (0.6m rather than 1 meter). The original imagery was collected at 20,000 ft. and centered on USGS quarter-quads.

Browse Graphic

none available

Time Period of Content Date

04/2005

Currentness Reference

The dates of the original aerial photography were April 8, 2005, Aril 13, 2005 and April 14, 2005.

Access Constraints

Subject to License Agreement with the Markhurd.

Use Constraints

Subject to License Agreement with Markhurd.

Distributor Organization

Markhurd

Ordering Instructions

For more information about licensing and purchasing the data, go to http//markhurd.com or call Markhurd 763-420-9606

Online Linkage

none available

Section 1

Identification Information

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Originator

MARKHURD

Title

2005 Digital Orthophotos, Twin Cities Metropolitan Area

Abstract

This Dataset contains 267 black and white, Color, and Color Infeared orthophoto quarter-quadrangles (DQQs), 3.75' x 3.75' covering the 7 county Twin Cities (Minneapolis and St. Paul) Metropolitan Area in Minnesota. A quarter-quadrangle is included if its coverage includes any portion of the Twin cities 7 county area. The orthophotos are in UTM, Zone 15, NAD83 projection. Each black and white image is approximately 115Mb with a 0.6 meter image pixel (2 ft) in TIFF and MrSid format. The color and CIR images are approximately 350 Mb with a 0.6 meter pixel (2 ft) in TIFF and MrSid format. These orthophotos were produced using the USGS DOQ specifications except for file format and pixel size (0.6m rather than 1 meter). The original imagery was collected at 20,000 ft. and centered on USGS quarter-quads.

Purpose

The digital orthophotos will be used for many mapping and analysis functions.

Time Period of Content Date

04/2005

Currentness Reference

The dates of the original aerial photography were April 8, 2005, Aril 13, 2005 and April 14, 2005.

Progress

Complete

Maintenance and Update Frequency

Unknown

Spatial Extent of Data

Twin Cities 7 County Metropolitan Area. This includes the counties of Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and Washington in Minnesota.

Bounding Coordinates

-94.06
-92.69
45.44
44.44

Place Keywords

Twin Cities, Anoka County, Carver County, Dakota County, Hennepin County, Ramsey County, Scott County, Washington County.

Theme Keywords

orthophotography, ortho, orthophotos, DOQ, DOQQ, imagery, images, digital ortho, aerial photography, aerial photos, digital aerial photography

Theme Keyword Thesaurus

Access Constraints

Subject to License Agreement with the Markhurd.

Use Constraints

Subject to License Agreement with Markhurd.

Contact Person Information

Mr. Dan knutson,
Markhurd
13400 68th Ave N
Maple Grove, Minnesota 55311-3515
Phone: 763-420-9606
FAX: 763-420-9584
E-mail: dknutson@markhurd.com

Browse Graphic

none available

Browse Graphic File Description

Associated Data Sets

2000 Metropolitan Council Digital Orthophotos
1997 Metropolitan Council Digital Orthophotos
1991 USGS DOQs

Section 2

Data Quality Information

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Attribute Accuracy

Logical Consistency

Completeness

Entire seven county metro area is covered

Horizontal Positional Accuracy

NMAS @ 1:12,000 scale, 90% of well-defined points fall within 33.3 ft

Vertical Positional Accuracy

Not applicable

Lineage

Markhurd acquired new Digital black and white, color, and color infrared, photography at an altitude of 20,000 ft photo scale of 1''= 4,233' with a 0.6m pixel (2 ft) with Ziess DMC (Digital Mapping Camera) flight lines were N-S with a 60% forward overlap and a 30% side Lap. There were 22 flight lines, 1,132 exposures.

The DMC camera consists of 8 sensors: 4 panchromatic sensors and 4 multi-spectral sensors. The multi-spectral sensors are 3K x 2K in size, with one sensor capturing red data, one capturing blue data, one capturing green data, and one capturing near-infrared data (IR band pass 740-850nm). The four panchromatic sensors each capture one image of a particular area (7K x 4K), which slightly overlap one to another and are used to produce one large mosaicked image, 7680 x 13824 in size.

A Fully Analytical Aerotraiangulation (AT) of the aerial images was developed to be used in the orthorectification process. The original photo targets were recaptured along with probed data points from the 2000 orthophoto project to complete the (AT) solution.

The council provided the USGS 30 Meter DEM to Markhurd in UTM, NAD83, horizontal units in meters, vertical units (Z-units) in feet, tiled by USGS quadrangle. The DEM files are used in the orthorectification process.

Markhurd used a softcopy process to create the final digital orthophotos. Digital Orthophots Quarter-Quads were developed following the USGS standards for digital orthophotos (DOQs) with the exception of pixel resolution 0.6 meters (2 ft), file format (TIFF with world files). USGS header (.hrd) file were not included as a deliverable.

Each black and white image is approximately 115 Mb with a 0.6 meter image pixel (2 ft).

Each black and white MrSid image is approximately 6 Mb.

Each color and CIR image is approximately 350 Mb with a 0.6 meter image pixel (2').

Each Color and CIR MrSid image is approximately 18 Mb.

The original imagery was collected at 20,000 ft with centered exposures at the quarter quad edges, quarter quad center, and one in-between with a 12um (0.6 meter) pixel.

Source Scale Denominator

51000

Section 3

Spatial Data Organization Information

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Native Data Set Environment

Geographic Reference for Tabular Data

Spatial Object Type

Raster

Vendor Specific Object Types

Tiling Scheme

3.75 minute quadrangle sheets (USGS 7.5 minute 'quarter quads')

Section 4

Spatial Reference Information

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Horizontal Coordinate Scheme

UTM

Ellipsoid

GRS80

Horizontal Datum

NAD83

Horizontal Units

Meters

Distance Resolution

Altitude Datum

NAVD88

Altitude Units

Meters

Cell Width

0.6

Cell Height

0.6

UTM Zone Number

15

Section 5

Entity and Attribute Information

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Entity and Attribute Overview

Entity and Attribute Detailed Citation

Section 6

Distribution Information

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Publisher

Markhurd

Publication Date

Contact Person Information

Mr. Dan Knutson

Markhurd
13400 68th Ave N
Maple Grove, Minnesota 55311-3515
Phone: 763-420-9606
FAX: 763-420-9584
E-mail: info@markhurd.com

Distributor's Data Set Identifier

Met Orthos2005

Distribution Liability

See Markhurd GIS Data Base License Agreement

Transfer Format Name

TIFF (.tif) with world files (.tfw) for geographic reference. MrSid

Transfer Format Version Number

TIFF ver 6.0 MrSid ver

Transfer Size

Approximately 115 Mb for black and white, 350 Mb for Color and Color IR per quarter-quadrangle MrSid for Color and CIR 18 Mb, MrSid black white 6 Mb.

Ordering Instructions

For more information about licensing and purchasing the data, go to http//markhurd.com or call Markhurd 763-420-9606

Online Linkage

none available

Section 7

Metadata Reference Information

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Metadata Date

Contact Person Information

,


,
Phone:
FAX:
E-mail: none available

Metadata Standard Name

Metadata Standard Version

1.2

Metadata Standard Online Linkage

http://www.lmic.state.mn.us/gc/stds/metadata.htm