Metadata for Helena, Montana 2004 Color Orthophotographs
Identification Information:
Citation:
Originator:
SurDex Corporation
520 Spirit of St. Louis Blvd.
Chesterfield, MO 63005
(636) 532-3427
http://www.surdex.com
Publication date: 01/14/2005
Title: Helena, Montana 2004 Color Orthophotographs
Edition: 2004
Publication place: Helena, Montana
Publisher: Montana State Library
Online linkage: http://apps.msl.mt.gov/Geographic_Information/Data/Aerial_Photos/helena_hrcolor_2004.aspx

Abstract:
This data set was prepared for the City of Helena, Lewis and Clark County, and the U.S. Geological Survey by Surdex Corporation of Saint Louis, Missouri. It is an orthorectified mosiac of natural-color aerial photos from April 26, 2004. The horizontal resolution of the images are one foot. This data was originally provided to the State Library in UTM coordinates as TIFF images in UTM coordinates with a resolution of 0.3 meters. The Library converted the images to State Plane Coordinates and re-sampled the resolution to one foot (0.3048 meters).
Purpose:
Digital images or aerial photographs were captured to support various governmental, municipal, tribal, and emergency management GIS activities. Orthorectified imagery products will be used to identify and collect geospatial information about structures, transportation, infrastructure, facilities and other information relative to multiple GIS applications.

Time period of content:
Calendar date: 04/26/2004
Currentness reference: ground condition
Status:
Progress: Complete
Maintenance and update frequency: None planned
Access constraints: None
Use constraints:
Users must assume responsibility to determine the usability of this data for their purposes. Detailed information on varying horizontal accuracy is provided to facilitate appropriate use of the raster digital information

The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.
Point of contact:
RJ Zimmer
GIS Center Manager
City of Helena and Lewis & Clark County, MT
316 North Park Ave.
Helena, MT 59624


Telephone: (406) 447-8367
Fax: (406) 447-8386
E-Mail: RJZIMMER@co.lewis-clark.mt.us


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Data Quality Information:
Attribute accuracy report:
Rigorous QC procedures are applied during photographic acquisition and inspection to ensure minimal amounts of radiometric variability in images. A global color balance is performed on final mosaicked images. Slight radiometric differences may occur between adjacent orthoimages due to the following; source photography capture dates, times and sun angles of aerial photography along flight lines.
Quantitative attribute accuracy assessment:
Attribute accuracy value: 0
Attribute accuracy explanation: none

Logical consistency report:
All tiles will be butt-matched and delivered in GEOTIFF format on DVD-ROM
Completeness report:
All data was accounted for and prepared as specified in the contract between Lewis & Clark County and Surdex Corporation.


Horizontal Positional Accuracy Report: Helena Fully Analytical Aerial Triangulation Report (FAAT)
Quantitative horizontal positional accuracy assessment:
Horizontal positional accuracy value: 2.03
Horizontal positional accuracy explanation: See section 3.1 of FAAT Report

Vertical positional accuracy report:
No explicit vertical accuracy requirements apply to the orthophotos generated on this project.


Lineage:
Source information:
Originator: Surdex Corporation
Publication date: 04/26/2004
Title: Surdex Aerial Photography
Source scale denominator: 1667
Type of source media: stable base material
Source contribution: Imagery Source
Calendar date: 04/26/2004
Source information:
Originator: Surdex Corp
Publication date: Unpublished Material
Title: Surdex compiled DTM
Type of source media: digital file
Source contribution: Provides ground elevations for orthorectification process.
Calendar date: 04/26/2004
Source information:
Originator: DJ&A
Publication date: Unpublished Material
Title: Control Input
Source contribution:
ground control used to establish positions for reference and correlation purposes and as input to the aerotriangulation process. Control consists of both airborne GPS to provide camera station positions and photoidentifiable surveyed ground control for ground reference.
Calendar date: 04/26/2004
Source information:
Originator: U.S. Geological Survey
Publication date: 10/02/2002
Title: Report of Calibration
Source contribution: camera calibration parameters
Calendar date: 10/02/2002

Process step:
The process description for the source information is detailed in the Analytical Aerial Triangulation report for Helena, MT. Any other process description regarding how the digital orthophoto data was produced can be obtained from Surdex Corporation. The complete processes used by Surdex contains sensitive business procedures that are proprietary to Surdex. Surdex is willing to release this information to interested parties provided a binding Non-Disclosure Agreement has been executed.
Process date: 10/01/2004
Process contact:
Wade Williams
Project Manager
Surdex Organization
520 Spirit of St. Louis Blvd.
Chesterfield, MO 63005


Telephone: (636) 532-3427
Fax: (636) 537-9638
E-Mail: wadew@surdex.com


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Spatial Data Organization Information:
Raster object information:
Raster object type: Pixel
Row count: 50720
Column count: 56810
Number of bands: 3
Vertical count: 1
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Spatial Reference Information:
Horizontal coordinate system definition:
Projected coordinate system name: Montana State Plane
Grid coordinate system name: State Plane Coordinate System
SPCS zone identifier: 2500
Lambert conformal conic:
Standard parallel: 45.000
Standard parallel: 49.000
Longitude of central meridian: -109.500000
Latitude of projection origin: 44.250000
False easting: 60000.000
False northing: 0.000
Planar distance units: meters
Geodetic model:
Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 1980
Semi-major axis: 6378137.000000
Denominator of flattening ratio: 298.257222
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Distribution Information:
Distributor:
Montana State Library
PO Box 201800
Helena, MT 59620-1800


Telephone: 406-444-5354
TDD/TTY telephone: 406-444-4799
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov


Resource description: Downloadable Data


Distribution liability:
The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.

Standard order process:
Digital form:
Format name: MrSID Image
Online option:
http://apps.msl.mt.gov/Geographic_Information/Data/Aerial_Photos/helena_hrcolor_2004.aspx
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Metadata Reference Information:
Metadata date: 07/19/2013
Metadata review date: 04/17/2013
Metadata review date: 12/10/2004
Metadata contact:
Edward D'Sousa
Project Manager
Surdex Corporation
520 Spirit of St. Louis Blvd
Chesterfield, MO 63005


Telephone: (636) 532-3427
Fax: (636) 537-9638
E-Mail: dsousa@surdex.com


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