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WMS
Tags
aerial photograph, land surface, ortho-rectified digital image, imageryBaseMapsEarthCover, Maine
This photography was aquired for eelgrass, oil spill response planning, and other intertidal and shallow subtidal mapping applications.
The Low Tide service is an OGC-compliant web mapping service (WMS) which contains high resolution 24-bit color Ortho-rectified Digital Images (ODIs) collected and processed by J. W. Sewall Co. These digital images result from ortho-rectification and mosaicking of digital color aerial photographs. 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 1:2400 National Map Accuracy Standard (NMAS). This service is available as a seamless mosaic. The imagery covers a portion of the Maine coastline at low tide (low water). Imagery created from scanned analog photography which was processed to for ortho-rectified mosaicks.
James W. Sewall Co., Sanborn Mapping Co., Maine Dept. of Marine Resources.
There are no licensing limitations.
Extent
There is no extent for this item.
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Monday through Friday
James W. Sewall Co., Sanborn Mapping Co., Maine Dept. of Marine Resources.
flight date
Users must assume responsibility to determine the usability of this data for their purposes.
The seamless presentation is available to Maine GIS users through an OGC-compliant WMS service presented by the Maine Office of GIS and the Maine GeoLibrary Board.
There are no licensing limitations.
Monday through Friday
Monday through Friday
The Low Tide service is an OGC-compliant web mapping service (WMS) which contains high resolution 24-bit color Ortho-rectified Digital Images (ODIs) collected and processed by J. W. Sewall Co. These digital images result from ortho-rectification and mosaicking of digital color aerial photographs. 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 1:2400 National Map Accuracy Standard (NMAS). This service is available as a seamless mosaic. The imagery covers a portion of the Maine coastline at low tide (low water). Imagery created from scanned analog photography which was processed to for ortho-rectified mosaicks.
This photography was aquired for eelgrass, oil spill response planning, and other intertidal and shallow subtidal mapping applications.
flight date
The seamless presentation is available to Maine GIS users through an OGC-compliant WMS service presented by the Maine Office of GIS and the Maine GeoLibrary Board.
There are no licensing limitations.
James W. Sewall Co., Sanborn Mapping Co., Maine Dept. of Marine Resources.
The Coastal Maine Low Water Ortho-rectified Digital Images (ODIs)presented in ORTHO_LW cover a portion of the Maine coast from Eastern Penobscot Bay to Schoodic Point. The aerial photography was flown in 2008. The orthoimages produced from the photography have a pixel resolution (or ground sample distance) of 0.5 meters.
Digital file features provide a digital photographic map suitable for applications requiring a 1:2400 National Map Accuracy Standard (NMAS).
Data captured.
A proprietary software program from Space Imaging was used to re-calculate some pixel values in the images. Pixels in which 1 or 2 of the 3 bands had values of zero were re-calculated to one. If all 3 bands equaled zero than the zero values were left untouched.
Before loading into the ArcSDE database, the pixels in the .tiff images were adjusted to each other so that the pixels overlapped, allowing mosaicking. To adjust the pixels, an ESRI program name world_file_adjuster was used.
The sderaster command was used to load the images into the ArcSDE database to create the ORTHO_MCP mosaic. During the load, the sderaster -o option was used for values equaled to zero. This loaded the images with a mask for pixels with a value of zero (one, two, or three bands).
The individual tiles were converted to MrSID imagery using LizardTech software. The original tiles were then resampled to create overview images for WMS. The resulting data are served from a MapServer-based system over the Internet.
Users must assume responsibility to determine the usability of this data for their purposes.
The Maine Office of GIS and the GeoLibrary Board provide web mapping services to distribute aerial photos and other digital data. A WMS is not a web application which you can see in a web browser; rather, it requires you to add the service to a GIS software application.
http://www.maine.gov/geolib/wms.htm