Maine Orthoimagery Regional SPOT 2004 (Imagery Layer)

Identification Information:
Citation:
Citation Information:
Publication Date: 20181026
Title: Maine Orthoimagery Regional SPOT 2004 (Imagery Layer)
Online Linkage: https://gis.maine.gov/arcgis/rest/services/imageryBaseMapsEarthCover/orthoRegionalSpot2004/ImageServer
Description:
Abstract: These data are panchromatic satellite data from the French SPOT-5 satellite. They represent a black-and-white "picture" of Earth from the satellite using 5-meter pixels (5m x 5m squares) as the minimum unit for imaging. The collection dates are mostly during the leaf-on season in 2004. Two scenes are from winter collects and snow/ice can be seen. This dataset was created through orthorectification of SPOT imagery using USGS Digital Orthophoto Quadrangles and Maine DEMs in ERDAS OrthoBASE 8.7. The orthorectified imagery was then warped using Space Imaging's proprietary Autowarp software. Autowarp computes tie points between two images based on correlation between similar points in the images and then applies a locally varying warp based on the tiepoints. The program was given an initial set of ground control points to create a coarse quadratic warp which was then refined through the addition of more points selected by the program. This work was done by Space Imaging and Sanborn staff. Certain high-elevation areas were further orthorectified by i-cubed to reduce horizontal error. Color balancing for the mosaic was done using GIMP image processing software by Maine DEP GIS staff. Note that balancing was done to enhance vegetated areas. In most cases, this means loss of contrast in urban areas. The raw data are much darker, but would provide more detail in urban areas than these processed data (at the expense of loss of contrast in vegetated areas). These data are part of the MELCD 2004 landcover and impervious mapping project for Maine. The data are LICENSED to the following entities: -Federal Government organizations when working with Maine on joint projects -All State Government departments and agencies within Maine -Regional county and local governments within Maine -K-12 schools, State Colleges and Universities within Maine. These data were the base imagery for the MELCD 2004 project. They were merged with LandSat TM data to create sharpened multispectral data for landcover mapping.
Purpose: These data are panchromatic satellite data from the French SPOT-5 satellite. They represent a black-and-white "picture" of Earth from the satellite using 5-meter pixels (5m x 5m squares) as the minimum unit for imaging. The collection dates are mostl
Time Period of Content:
Time Period Information:
Single Date/Time:
Calendar Date: 2004
Currentness Reference: Unknown
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -71.1770999999988
East Bounding Coordinate: -66.54089999999887
North Bounding Coordinate: 47.48329999999919
South Bounding Coordinate: 42.98399999999926
Keywords:
Theme:
Theme Keyword Thesaurus: ISO 19115 Topic Categories
Theme Keyword: imageryBaseMapsEarthCover
Place:
Place Keyword Thesaurus: None
Place Keyword: Maine
Access Constraints: None
Use Constraints: Access: Public Use: User assumes risk. Download and redistribution of these data is prohibited without SPOT Image Corp approval.
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Maine GeoLibrary
Contact Position: GIS Coordinator
Contact Address:
Address Type: mailing and physical
Address: 51 Commerce Dr, 3rd floor
City: Augusta
State or Province: ME
Postal Code: 04330
Country: US
Contact Voice Telephone: 207-624-7700
Contact Electronic Mail Address: GeolibraryBoard.OIT@maine.gov
Data Set Credit: SPOT Image Corp, MaineGeoLibrary, Space Imaging, Sanborn Mapping
Metadata Reference Information:
Metadata Date: 20181026
Metadata Contact:
Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Time Convention: local time