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Orthophoto, Raster
The Maine GeoLibrary Board (MEGIS) has developed a statewide, 5-year, rotating orthoimagery acquisition program for Maine to facilitate state, regional and local government GIS base mapping in an efficient and cost effective program. The State of Maine will use digital orthoimagery for the development of various base map products in a computerized GIS that will support the needs of the state and multiple stakeholders through applications, such as, multi-jurisdictional homeland security mapping applications, state and county emergency management applications, regional and local planning, state and local public safety applications, economic development and other GIS business objectives.
All imagery was collected during the 2012 Spring flying season during leaf-off conditions for deciduous vegetation in the State of Maine. The sun angle was at 30-degrees or greater, and streams were within their normal banks. During the flight planning and acquisition, a significant effort was made to limit clouds, snow, fog, haze, smoke, or other ground obscuring conditions in the imagery. In no case does the maximum cloud cover exceed 5% per image. Within the immediate areas of power plants, factories, or controlled agricultural burns some steam or smoke and/or shadows may be visible on imagery. Supplemental flights were flown over the City of Portland central business district to minimize building lean.
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No restrictions apply to this data.
Extent
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| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:50,000 |
ground condition
Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user's sole risk.
No restrictions apply to this data.
No restrictions apply to this data.
ground condition
Monday through Friday
All imagery was collected during the 2012 Spring flying season during leaf-off conditions for deciduous vegetation in the State of Maine. The sun angle was at 30-degrees or greater, and streams were within their normal banks. During the flight planning and acquisition, a significant effort was made to limit clouds, snow, fog, haze, smoke, or other ground obscuring conditions in the imagery. In no case does the maximum cloud cover exceed 5% per image. Within the immediate areas of power plants, factories, or controlled agricultural burns some steam or smoke and/or shadows may be visible on imagery. Supplemental flights were flown over the City of Portland central business district to minimize building lean.
The Maine GeoLibrary Board (MEGIS) has developed a statewide, 5-year, rotating orthoimagery acquisition program for Maine to facilitate state, regional and local government GIS base mapping in an efficient and cost effective program. The State of Maine will use digital orthoimagery for the development of various base map products in a computerized GIS that will support the needs of the state and multiple stakeholders through applications, such as, multi-jurisdictional homeland security mapping applications, state and county emergency management applications, regional and local planning, state and local public safety applications, economic development and other GIS business objectives.
ground condition
No restrictions apply to this data.
No restrictions apply to this data.
Digital imagery was flown within prescribed parameters having proper orientation and the highest radiometric quality.
All digital imagery are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images.
The orthoimagery meets the American Society for Photogrammetry and Remote Sensing (ASPRS) Accuracy Standards for Class 1 Map Accuracy.
Meets or exceeds (ASPRS) Class 1 Map Accuracy for 1:600 scale mapping. Well defined ground features represented on the orthophotos are within a 0.5 foot planimetric limiting RMSE of their true coordinate position.
Digital aerial imagery was acquired to produce 4-band, 8-bit ortho-imagery. This imagery was orthorectified to the LiDAR of the Northeast program data and the ground control survey.
The imagery was acquired on April 19, 17, and 16 2012 using Leica ADS80 sensor 31105 multispectral scanner with a fundamental image resolution of 0.24-feet over the project area. The ADS80/SH82 uses Leica IPAS direct positioning and orientation system that is based on airborne GPS and inertial measurement unit (IMU) technology. Airborne GPS and IMU data were post-processed using IPAS Pro 1.3 software package while all source imagery was processed using Leica XPro 5.0.1 software package. This package provides the capability to perform digital image processing, aerial triangulation and image rectification. Image mosaicking and final tiling was performed using OrthoVista 4.5 software.
Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user's sole risk.