ortho_hf
Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Distribution_Information
Metadata_Reference_Information
Identification Information
Section Index
Citation:
Citation Information:
Originator: GlobeXplorer, Maine Library of Geographic Information (MLGI), Maine Office of Geographic Information Systems (MEGIS)(comp.)
Publication Date: 200307
Title: ortho_hf
Edition: 200104
Series Information:
Series Name: CITIPIX Ortho-rectified Digital Images (ODI)
Issue Identification: 2001
Publication Information:
Publication Place: Augusta ME
Publisher: Maine Office of Geographic Information Systems (MEGIS)
Other Citation Details:
1:1200 (MEGIS) ORTHO_HF consists of 906 tiles of high resolution, 24-bit color aerial photography. These GLOBEXPLORER CITIPIX digital images have a pixel resolution (or ground sample distance) of 1/2 foot, are precision geo-referenced and ortho-rectified, and accurate for 1"=100' mapping applications. Flown in April 2001, from Portland to Auburn ME the ortho-rectified digital imagery covers all of Cumberland County and part of Androscoggin County, Maine.
Online Linkage: http://megis.maine.gov/catalog/
Description:
Abstract:
ORTHO_HF contains high resolution 24-bit color CITIPIX Ortho-rectified Digital Images (ODIs) from GLOBEXPLORER. These digital images result from ortho-rectification and mosaicking of scanned color aerial photographs. Each pixel represents a planimetric square 1/2 foot on a side on the ground. Digital file features include high quality ground-level georeferencing, derived from accurate positioning and geometric corrections, and provide a digital photographic map suitable for applications requiring a 1:1200 National Map Accuracy Standard (NMAS). Based on the CITIPIX nation-wide standard for urban aerial coverage, georeference and distribution, CITIPIX ODIs serve the GIS industry, state and local governments as well as private sector, supplying 6-inch (15-cm) ground pixel size map-accurate continuous digital photographic coverage. An Internet ORTHO viewer is available at http://megisims.state.me.us/website/orthomap/viewer.htm .
Purpose:
Based on the CITIPIX nation-wide standard for urban aerial coverage, georeference and distribution, CITIPIX ODIs serve the GIS industry, state and local governments as well as private sector, supplying 6-inch (15-cm) ground pixel size map-accurate continuous digital photographic coverage.
The seamless presentation is available to Maine GIS users through direct connection to the MEGIS Oracle/ArcSDE database, for viewing through an internet ArcIMS application at http://megisims.state.me.us/website/orthomap/viewer.htm and for free download from the Maine GIS Internet Data Catalog.
Information in this document on the CITIPIX ODIs presented in ORTHO_HF was drawn from: GlobeXplorer. 2003. CITIPIX Ortho-rectified Digital Image (ODI) Product Description. March 2003, Walnut Creek, CA. CITIPIX is a trademarked product of GlobeXplorer. For more information about GlobeXplorer see http://www.globexplore.org/citipix.html.
Supplemental Information:
ORTHO_HF is available from Maine GIS in three presentation formats. First as a seamless mosaic of 906 ODIs in .TIFF format stored in Oracle 9i for users of ArcSDE; second in the ArcIMS ORTHO viewer available at http://megisims.state.me.us/website/orthomap/viewer.htm, and third as 3624 quarter images, in MrSID compression format, available for free download from the Maine GIS Data Catalog.
The image names of the MrSID files were created so that the first 3 digits in the name increase by one from west to east. The last 4 digits increase by one from south to north. Images in the southwest location will always have the lowest numbered name and images in the northeast will always have the highest numbered name. A file index with the same names is also available in ArcSDE, in the ArcIMS presentation, and for download in the Maine GIS Internet Data Catalog.
Both ArcExplorer 4.0.1 (free for download from http://www.esri.com/software/arcexplorer/index.html) and the ArcGIS 9.x module ArcMap accept a URL for "adding" data from an Internet location. Open ArcCatalog, select "GIS Servers", select "Add ArcIMS Server", at URL of server type http://megisims.state.me.us and select "Get List", select "orthomap" or "basemap", etc. Use the connection in created in ArcMap to access high resolution orthophotography and data from other MEGIS Internet Map Services without data storage or data management costs.
Time Period of Content:
Time Period Information:
Currentness Reference: flight date
Status:
Progress: Complete
Maintenance and Update Frequency: unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -70.84727
East Bounding Coordinate: -69.86047
North Bounding Coordinate: 44.17948
South Bounding Coordinate: 43.46049
Keywords:
Theme:
Theme Keyword Thesaurus: ISO Keyword Thesaurus
Theme Keyword: imageryBaseMapsEarthCover
Theme:
Theme Keyword Thesaurus: Maine GIS Thesaurus-Theme
Theme Keyword: aerial photograph
Theme Keyword: ortho-rectified digital image
Theme Keyword: color imagery 24-bit
Theme Keyword: ground sample distance 1/2 foot
Place:
Place Keyword Thesaurus: Maine GIS Thesaurus-Place
Place Keyword: Maine
Place Keyword: United States
Stratum:
Stratum Keyword Thesaurus: GCMD Parameter Keyword
Stratum Keyword: land surface
Stratum Keyword: radiance or imagery
Access Constraints:
Secondary distribution by permission only. Please see Maine Office of Geographic Information Systems (MEGIS) License Agreement at http://megis.maine.gov/ . Any secondary distribution must have this documentation appended.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: (MEGIS) Maine Office of Geographic Information Systems
Contact Position: GIS Coordinator
Contact Address:
Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA
Contact Voice Telephone: (207) 624-7700
Contact Facsimile Telephone: (207) 287-3842
Hours of Service: Monday through Friday 0800 - 1700 EST
Data Set Credit: Credit should always be given to the data source and/or originator when the data is transferred or printed.
Native Data Set Environment:
(GLOBEX) 906 CITIPIX Ortho-rectified Digital Image Mosaics were delivered by GlobeXplorer in a TIFF raster file format (with World file). Each original image is 2030 meters x 2030 meters with a 15 meter overlap, and image file size in .TIFF format is approximately 530 MB. For distribution in the Maine GIS Data Catalog, the images have been quartered and compressed using MrSID compression software. The compressed quarter images represent 1 square kilometer, are approximately 10 MB in size. Maine Office of Information Technology (OIT) Oracle 9i, Maine Office of Geographic Information Systems (MEGIS), Maine GIS SDE, SDEUSER, SDE.DEFAULT, Maine GIS Internet Data Catalog http://megis.maine.gov/catalog/, Maine GIS ArcIMS http://megisims.state.me.us/website/orthomap/viewer.htm
Cross Reference:
Citation Information:
Originator: Maine Department of Environmental Protection (MEDEP)
Publication Date: 20031028
Publication Time: Unknown
Title: index_hf
Geospatial Data Presentation Form: vector digital data
Series Information:
Series Name: Maine GIS
Issue Identification: SDE server; Internet Data Catalog
Publication Information:
Publication Place: Augusta ME
Publisher: Maine Office of Geographic Information Systems (MEGIS)
Other Citation Details: 1:1200
Online Linkage: http://megis.maine.gov/catalog/
Data Quality Information
Section Index
Logical Consistency Report:
The CITIPIX Ortho-rectified Digital Images (ODIs)presented in ORTHO_HF covers all of Cumberland County and some of Androscoggin County. The aerial photography was flown in April 2001at a photoscale of 1:10,800. The orthoimages produced from the photography have a pixel resolution (or ground sample distance) of 1/2 foot. CITIPIX ortho-rectification used high accuracy digital terrain models, geometric correction, and a mosaic process to create 2030 meter x 2030 meter georeferenced tiles that overlap the UTM NAD83 grid by ~15 meters in all directions. In ORTHO_HF these tiles are presented as a single mosaic.
ORTHO_HF is available at Maine GIS in two presentation formats. The first is a seamless mosaic of 906 ODIs stored in Oracle 9i for users of ArcSDE 8.x and ArcIMS. The second consists of 3624 quarter images, in MrSID compression format, available for distribution through the Maine GIS Data Catalog. There is some loss of resolution in compression. The image names of the MrSID files were created so that the first 3 digits in the name increase by one from west to east. The last 4 digits increase by one from south to north. Images in the southwest location will always have the lowest numbered name and images in the northeast will always have the highest numbered name. A file index with the same names is also available in ArcSDE 8.x and in the ArcIMS presentaion.
Completeness Report:
The CITIPIX ODIs in ORTHO_HF were acquired as part of a larger effort by the Maine Library of Geographic Information (established April 9, 2002 by L.D.2116) to obtain and/or create new high resolution digital orthophotography for Maine. CITPIX ODI were flown in 2001 and cover all of Cumberland County and some of Androscoggin County.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
The accuracy and quality of the CITIPIX ODIs in ORTHOS_HF meet National Map Accuracy Standards 1:1,200 scale, plus/minus 1 meter or 3.33 feet, and is accurate for mapping applications at 1" = 100'.
Quantitative Horizontal Positional Accuracy Assessment:
Horizontal Positional Accuracy Value: 1
Horizontal Positional Accuracy Explanation:
Digital file features include high quality ground-level georeferencing, derived from accurate positioning and geometric corrections, and provide a digital photographic map suitable for applications requiring a 1:1200 National Map Accuracy Standard (NMAS).
Lineage:
Source Information:
Source Citation:
Citation Information:
Originator: GlobeXplorer
Publication Date: 20030303
Title: (CITIPIX)CitiPix
Geospatial Data Presentation Form: remote-sensing image
Publication Information:
Publication Place: Walnut Creek CA
Publisher: GlobeXplorer
Other Citation Details: High resolution, 6-inch and 1-foot ground resolution, 24-bit color imagery, precision geo-referenced and ortho-rectified aerial photography, accurate for 1"=100' mapping applications
Online Linkage: http://www.globexplore.org/citipix.html
Source Time Period of Content:
Source Citation Abbreviation: citipix
Source Contribution: ORTHO_HF contains high resolution 24-bit color CITIPIX Ortho-rectified Digital Images (ODIs). Flown in April 2001, from Portland to Auburn ME.
Process Step:
Process Description:
The ArcSDE in Oracle version of ORTHO_HF is a seamless mosaic of CITIPIX (GlobeXplorer trademark) Ortho-rectified Digital Images (ODIs). CITIPIX ODIs are derived from color photographs, taken from an altitude of approximately 10,800 feet (3,300 meters) above mean terrain, using a 12 inch (305-mm) focal length Zeiss TOP30 aerial camera. The aircraft is equipped with a high accuracy dual frequency GPS2 receiver operating in kinematic relative mode and camera orientation is measured by inertial3 sensor technology. The 12-inch (305 mm) focal length lens, when compared to the usual six-inch, minimizes the perspective distortion in high buildings down town contexts. The nominal scale of the photography is approximately 1:10,800. Since ODIs are mosaics and considering flight overlaps, only the central portion of each aerial photograph is used in the final assembly, representing approximately 28% of each photo's coverage.
Zeiss-Intergraph PhotoScan TD high-resolution photogrammetric scanners are used to scan 10-inch wide color negative film rolls in a controlled environment room (temperature, humidity and dust). Scanner aperture (pixel size) is 1,814 dots per inch or 14 *m4 which, when used on a 1:10800 photo-scale image, yields a ground pixel size of approximately 6 inches (15 cm), and which produces a color image of 16,700 by 16,700 24-bit pixels. This level of scanning resolution closely matches the film grain, which is between 10 and 12 *m, thus very close to 100% of the information present on the film itself is recorded in the digital file. Accuracy of these scanners is better than 2 *m, and lens distortion falls within the same order of magnitude. This insures that each measured pixel is right where it should be.
Ortho-rectification was performed by Kodak Global Imaging, a former Eastman Kodak Company no longer in operation, using it's own technology involving high accuracy digital terrain models (DTMS) (created from CITIPIX stereo-models), geometric corrections and mosaicking processes. Each of these operations was performed by highly trained personnel, operating a tailor-made computerized processing chain.
Once assembled in a continuous image covering sometimes thousands of photographs, base image data is separated in 2 km x 2km tiles, cut along Universal Transverse Mercator (UTM) even-numbered coordinate grid lines. A typical tile overlaps the UTM grid by an added 15 meters in all directions, the result being 2030 meters x 2030 meters tiles, overlapping each other by 30 meters: this is the default format of all ODI tiles produced and archived...
Georeference for each tile is computed from accurate ortho-rectification and mosaicking processes. Each tile is given a pixel/ground transformation matrix (with zero-rotation), included in the file georeferencing parameters. UTM or State Plane Coordinate System (SPCS7), North American Datum (NAD83) or NAD27, X and Y coordinates are computed for each tile...Due to the high level of accuracy in the ortho-rectification and georeferencing processes, seam lines are often hardly visible to untrained eyes, thanks to operator-controlled, computer assisted seam line positioning on the final mosaic.
Process Date: 2001
Process Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: (GLOBEX) GlobeXplorer
Contact Address:
Address Type: physical address
Address: 3021 Citrus Circle Suite 150
City: Walnut Creek
State or Province: CA
Postal Code: 94598
Contact Voice Telephone: 800 417 7808 or 925 280 8765
Contact Facsimile Telephone: 925 280 8760
Contact Electronic Mail Address: info@globexplorer.com or http://www.globexplorer.com
Process Step:
Process Description:
The MrSid versions of the ORTHO_HF images were cropped and compressed using LizardTech's GeoExpress Command Line 3.1 software (www.lizardtech.com). The original 2km x 2km .tif images from Globexplorer were provided to MEGIS as multi-band TIFF images with no compression. The images were cropped to 1km x 1km tiles using 1000-meter UTM boundaries, plus a 2-pixel (.3m) buffer. Images were compressed at a ration of 12:1 using 5 zoom levels and were stored as MrSID Generation 2 files. The compression and cropping were all done in a single operation using command-line tools in the software. The images were done in batches of roughly 100GB and processed using an ArcInfo Arc Macro Language (AML) script which determined the UTM coordinates and passed the appropriate arguments to the GeoExpress software.
Process Date: 2003
Process Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Maine Department of Environmental Protection
Contact Position: Senior Database Analyst
Contact Address:
Address Type: mailing address
Address: SHS 17
City: Augusta
State or Province: ME
Postal Code: 04333
Country: USA
Contact Voice Telephone: (207)287-4292
Contact Facsimile Telephone: (207)287-7896
Spatial Data Organization Information
Section Index
Indirect Spatial Reference: 906 images all of Cumberland County
Direct Spatial Reference Method: Raster
Raster Object Information:
Raster Object Type: Pixel
Row Count: 506868
Column Count: 546867
Spatial Reference Information
Section Index
Horizontal Coordinate System Definition:
Planar:
Grid Coordinate System:
Grid Coordinate System Name: Universal Transverse Mercator 1983
Universal Transverse Mercator:
UTM Zone Number: 19
Transverse Mercator:
Scale Factor at Central Meridian: 0.9996
Longitude of Central Meridian: -69
Latitude of Projection Origin: 0
False Easting: 500000
False Northing: 0
Planar Coordinate Information:
Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:
Abscissa Resolution: 1
Ordinate Resolution: 1
Planar Distance Units: meters
Geodetic Model:
Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257
Distribution Information
Section Index
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization: (MEGIS) Maine Office of Geographic Information Systems
Contact Position: GIS Coordinator
Contact Address:
Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA
Contact Voice Telephone: (207) 624-7700
Contact Facsimile Telephone: (207) 287-3842
Hours of Service: Monday through Friday 0800 - 1700 EST
Distribution Liability:
Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
Standard Order Process:
Digital Form:
Digital Transfer Information:
Format Name: MrSID
Format Version Number: 1.3.1 Geospatial Encoder
Format Specification: Portable Image Format
Format Information Content:
Multiple options exist for viewing images in MrSID format which consist of .sid and .sdw georeferencing files. For the GIS community, viewers exist for or are built into ArcView, ArcInfo Desktop 9.x, MapInfo, MapObjects, GeoMedia, IRAS-C, cadcorp Map Modeller, MicroStation, Photoshop, and other major imaging applications.
File Decompression Technique:
Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/.
Digital Transfer Option:
Online Option:
Computer Contact Information:
Access Instructions:
These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog. Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/ . Files compressed with MrSID software are usable in many GIS environments, by default or by extension. If you are not already a GIS user, a link to free software for viewing of these files, ArcExplorer from Environmental Systems Research Institute, Inc. (ESRI), is available at http://megis.maine.gov/links/ . Trial viewing software for MrSID files is also available from the software developer LizardTech at http://www.lizardtech.com/download/dl_download.php?detail=geo_geoexpressview&platform=win .
Digital Transfer Option:
Online Option:
Access Instructions: Where file size and Internet access permit, data requests can be made available via File Transfer Protocol (FTP).
Fees: Data may be downloaded from Maine GIS Internet Data Catalog at no charge.
Standard Order Process:
Distribution Information
Section Index
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization: (MEGIS) Maine Office of Geographic Information Systems
Contact Position: GIS Coordinator
Contact Address:
Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA
Contact Voice Telephone: (207) 624-7700
Contact Facsimile Telephone: (207) 287-3842
Hours of Service: Monday through Friday 0800 - 1700 EST
Distribution Liability: Users must assume responsibility to determine the usability of this data for their purposes.
Standard Order Process:
Digital Form:
Digital Transfer Information:
Format Name: ARCSDE
Format Version Number: ArcSDE 9.x
Format Information Content: Oracle 9i
Digital Transfer Option:
Online Option:
Access Instructions: Please contact the Maine Office of GIS (MEGIS) for access instructions.
Fees: Access is available through Maine's wide area network; WAN users may contact the Maine Office of Information Technology, Maine Office of Geographic Information Systems (MEGIS) for a login.
Distribution Information
Section Index
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization: (MEGIS) Maine Office of Geographic Information Systems
Contact Position: GIS Coordinator
Contact Address:
Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA
Contact Voice Telephone: (207) 624-7700
Contact Facsimile Telephone: (207) 287-3842
Hours of Service: Monday through Friday 0800 - 1700 EST
Distribution Liability: Users must assume responsibility to determine the usability of this data for their purposes.
Standard Order Process:
Digital Form:
Digital Transfer Information:
Format Name: WMS
Format Version Number: 1.1
Format Specification: OpenGIS (OGC) Web Map Service (WMS )
Format Information Content:
MEGIS has created a web based application for Maine GIS data that adheres to the OpenGIS Consortium (OGC) Web Mapping Specification (WMS 1.1.1) which allows map servers to create and send standard map images over the Web.
Digital Transfer Option:
Online Option:
Computer Contact Information:
Access Instructions: This metadata document contains embedded URLs that can be used to make OGC WMS 1.1.1 compliant map requests of the framework layers in the Maine GeoLibrary.
Fees: None
Ordering Instructions:
Currently OGC WMS 1.1.1 access is available for CONTOURS, DOQQ, E911RDS, HYD24L, HYD24P, INDEX_HF, MECNSLND, MEDOQINDEX, MEDOTPUB, MERAIL24, METWP24L, METWP24P, ORTHO_HF, ORTHO_FF, ORTHO_1F, ORTHO_2F, INDEX_FF, INDEX_1F, INDEX_2F, OTRANS. These images are available to the Web and client software for overlay and display of multiple maps using first of the URLS listed above. Access the OGC: WMS Framework "WMT_MS Get Capabilities" in XML using Internet browser or other XML friendly viewer.
Metadata Reference Information
Section Index
Metadata Date: 7/11/2003
Metadata Review Date: 9/25/2007
Metadata Future Review Date:
Metadata Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Maine Office of Geographic Information Systems
Contact Position: GIS Coordinator
Contact Address:
Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA
Contact Voice Telephone: 207 624-7700
Contact Facsimile Telephone: 207 287-4563
Hours of Service: Monday through Friday 0800 - 1700 EST
SMMS Metadata report generated Wednesday, 26/September/2007