collection curated by joecohen https://academictorrents.com/collection/massgis-datasets @article{, title = {Massachusetts USGS 15cm Color Ortho Imagery (2008/2009) - JPEG2000 Format}, journal = {}, author = {MassGIS }, year = {2008/2009}, url = {http://www.mass.gov/anf/research-and-tech/it-serv-and-support/application-serv/office-of-geographic-information-massgis/datalayers/colororthos2008.html}, abstract = { This data was converted from the MassGIS coq2008_15cm_sid data. Converted by Joseph Paul Cohen 2014 In spring 2008, the U.S. Geological Survey, as part of its Boston 133 Cities Urban Area mapping program, contracted for true-color imagery covering the metropolitan Boston area and beyond. Image type for the entire region (more than 1.7 million acres) is 24-bit, 3-band (red, green, blue) natural color. Each band has pixel values ranging 0-255. Pixel resolution is 30 cm., or approximately one foot. Additionally, 30 municipalities participated in the Boston Upgrade of the USGS project; these cities and towns contributed funding for separate flights to produce 4-band (red, green, blue, near-infrared) imagery. Pixel resolution for these images is 15 centimeters (approximately 6 inches). In spring 2009, USGS continued the project and 4-band 30cm imagery was obtained for the remainder of the state. Additionally, 14 municipalities provided funding for 4-band 15cm imagery to cover their communities. This digital orthoimagery can serve a variety of purposes, from general planning, to field reference for spatial analysis, to a tool for data development and revision of vector maps. It can also serve as a reference layer or basemap for myriad applications inside geographic information system (GIS) software. Images are available for download in the MrSID Generation 2 format, at 15:1 lossy compression ratio, 3 bands (RGB), as 1,500 meters × 1,500 meters tiles (based on the 2008/2009 USGS Color Ortho Index coq2008-09_index.pdf tiling scheme; refer to the 8-digit numbers in each tile).} } https://academictorrents.com/download/2080e36b9ba96a3736de959c28db6e039e5a8bc1 @article{, title = {Massachusetts USGS 30cm Color Ortho Imagery (2013) - JPEG2000 Format}, journal = {}, author = {MassGIS }, year = {2013}, url = {http://www.mass.gov/anf/research-and-tech/it-serv-and-support/application-serv/office-of-geographic-information-massgis/datalayers/colororthos2013.html}, abstract = {In spring 2013, the U.S. Geological Survey contracted for true-color imagery covering three urban areas in Massachusetts as defined by the USGS. Those areas are the metropolitan Boston area (and beyond), the greater Worcester area, and the greater Springfield area. Image type for all of the areas is 24 bit, 4-band (red, green, blue, and near-infrared RGBN) portions of the spectrum. Each band has pixel values ranging 0-255. Pixel resolution is 0.3 meters (30 centimeters), or approximately one foot. This digital orthoimagery can serve a variety of purposes, from general planning, to field reference for spatial analysis, to a tool for data development and revision of vector maps. It can also serve as a reference layer or basemap for myriad applications inside geographic information system (GIS) software. It was created to provide easily accessible geospatial data which is readily available to enhance the capability of Federal, State, and local emergency responders, as well as plan for homeland security efforts. These data also support The National Map. Aerial Acquisition The raw ADS80 image data were collected by Fugro EarthData, Inc. at about 2,896 meters above mean terrain during mid to late April 2013. The source imagery is cloud free, and was acquired in generally leaf-off conditions. Images are available for download in the JPEG2000 format, at a 20:1 compression ratio, 4 bands (RGBN), as 1,500 meters × 1,500 meters tiles. } } https://academictorrents.com/download/82c64b111b07ff855b8966701a13a25512687521 @article{, title= {Massachusetts USGS 15cm Color Ortho Imagery (2008/2009) - MrSID Format}, journal= {}, author= {MassGIS }, year= {2008/2009}, url= {http://www.mass.gov/anf/research-and-tech/it-serv-and-support/application-serv/office-of-geographic-information-massgis/datalayers/colororthos2008.html}, abstract= {In spring 2008, the U.S. Geological Survey, as part of its Boston 133 Cities Urban Area mapping program, contracted for true-color imagery covering the metropolitan Boston area and beyond. Image type for the entire region (more than 1.7 million acres) is 24-bit, 3-band (red, green, blue) natural color. Each band has pixel values ranging 0-255. Pixel resolution is 30 cm., or approximately one foot. Additionally, 30 municipalities participated in the Boston Upgrade of the USGS project; these cities and towns contributed funding for separate flights to produce 4-band (red, green, blue, near-infrared) imagery. Pixel resolution for these images is 15 centimeters (approximately 6 inches). In spring 2009, USGS continued the project and 4-band 30cm imagery was obtained for the remainder of the state. Additionally, 14 municipalities provided funding for 4-band 15cm imagery to cover their communities. This digital orthoimagery can serve a variety of purposes, from general planning, to field reference for spatial analysis, to a tool for data development and revision of vector maps. It can also serve as a reference layer or basemap for myriad applications inside geographic information system (GIS) software. Images are available for download in the MrSID Generation 2 format, at 15:1 lossy compression ratio, 3 bands (RGB), as 1,500 meters × 1,500 meters tiles (based on the 2008/2009 USGS Color Ortho Index coq2008-09_index.pdf tiling scheme; refer to the 8-digit numbers in each tile).}, keywords= {MassGIS}, terms= {}, license= {}, superseded= {} } https://academictorrents.com/download/166bf2b135167e5af37a35c4f09c25b453936496 @article{, title = {Massachusetts 1:5,000 Color Ortho Imagery (2005) - JPEG 2000 Format (Original)}, journal = {}, author = {MassGIS }, year = {}, url = {}, abstract = {Overview These medium resolution true color images are considered the new "basemap" for the Commonwealth by MassGIS. The photography for the entire commonwealth was captured in April 2005 when deciduous trees were mostly bare and the ground was generally free of snow. Image type is 4-band (RGBN) natural color (Red, Green, Blue) and Near infrared in 8 bits (values ranging 0-255) per band format. Image horizontal accuracy is +/-3 meters at the 95% confidence level at the nominal scale of 1:5,000. This digital orthoimagery can serve a variety of purposes, from general planning, to field reference for spatial analysis, to a tool for development and revision of vector maps. It can also serve as a reference layer or basemap for myriad applications inside geographic information system (GIS) software. The project was funded by the Executive Office of Environmental Affairs, the Department of Environmental Protection, the Massachusetts Highway Department, and the Department of Public Health.. Production Sanborn LLC of Colorado Springs, CO, performed all work for this project. The source imagery was acquired with a Vexcel Ultracam digital camera at a flying height of 5,070 meters above mean terrain and an approximate pixel resolution of 45 cm. Forward overlap was approximately 60%, except 80% in areas with tall structures (downtown Boston, Worcester, and Springfield), in order to reduce building lean, with sidelap of 33%. The entire state was covered by about 5500 image frames, captured over seven days from April 9 through April 17, 2005. The ground control used to support the mapping was collected by photographic identification of strategic points. The ground control coordinates were collected via GPS ground survey techniques. Aerial Triangulation was performed on softcopy workstations using Intergraph ISAT software for photo measurement and matching. The final bundle adjustment was performed using BINGO 5.2 software. A new digital elevation model was stereo compiled for the entire State from the newly acquired 2005 imagery. The DTM includes mass points, soft breaklines and hard breaklines. The images were ortho-rectified using METRO, Sanborn's proprietary software. Bridges were modeled in 3-D using standard photogrammetric stereo-compilation techniques on softcopy workstations. Sanborn's Metro process rectifies the bridges using the 3-Dimensional model using similar methodologies for correcting the positional accuracy of other ground features. The bridges were uniquely coded and later removed from the final deliverable DTM file. Imagery is georeferenced to Massachusetts State Plane Mainland (Lambert Conformal Conic Projection) NAD83 coordinate system, denominated in meters. Color balancing was performed using METRO_NICE software. The resulting images were mosaicked into one seamless database of imagery and extracted to match the existing MassGIS Orthophoto Index Grid tile layout (each image tile covers 4,000x4,000 meters on the ground.). Images were quality-controlled by Sanborn using Adobe PhotoShop software. Final deliverables included 1/2-meter pixel resolution GeoTiff images with supplementary tfw files and metadata. MassGIS quality assurance included rigorous independent checks of the spatial accuracy using other datasets of significantly higher accuracy, and field work that included the capture of highly accurate GPS points that were compared to the same locations appearing on the deliverables. MassGIS also assessed the visual quality and appearance of the images. Distribution Due to the large size of the original half-meter GeoTIFF images, MassGIS is also making these images available in the compressed MrSID and JPEG 2000 (JP2) formats. Options include images tiled by the orthophoto index as wells as large regional mosaics, which comprise from 26 to 73 ortho index tiles. Users may access the JPG2000 data by free download from the MassGIS ftp server or by ordering the Mosaics and MrSID tiles data on CD or DVD. Details are provided below. Original vs. "Contrast Stretched" Imagery MassGIS has produced a set of "Contrast Stretched" MrSID and JP2 data for users who do not have the software tools to modify the appearance of the original imagery. This second set of compressed data was produced from a set of GeoTIFFs that MassGIS modified with a 2.75 standard deviation linear contrast stretch in Erdas Imagine software. A linear contrast stretch is a simple way to improve the visible contrast of an image by changing the individual values of the pixels in the image. Usually, a contrast stretch is performed only on the display device (screen, printer, etc.), so that the data file values do not change. In this case, the stretched pixel values were saved to the tiffs and the tiffs were used to make the second set of MrSID and JP2 files. MassGIS is making this second set of images available for those whose software does not permit display adjustments, or who simply prefer not to adjust the contrast. These contrast stretched images may help solve some of the problems that some users encountered with getting the original images to look the way they wanted. These new images have a much greater contrast when compared to the originals. The drawback is that the stretch is "fixed", so that you cannot recoup the original pixel values. With the original set of images (GeoTIFF, MrSID, and JP2 formats), the user can achieve the same type of contrast adjustment seen in the second set of imagery and still make use of the full range of data values acquired by the digital cameras. Here are screen shots that compare the same area in the original MrSIDs (with no stretch or modification) and the contrast stretched imagery. To learn how to adjust the appearance of the original imagery to your liking, see the Display Options page pdf format of COQ 2005 Display Options doc format of COQ 2005 Display Options DOC file size 1MB . Free Download Images in the following formats are available for download as 4 km tiles (based on the Ortho Index tiling scheme) JPEG 2000, lossy, at 16:1 compression ratio, 4 bands (RGB and IR).15 MB each. Two sets: From original GeoTIFFs From contrast stretched GeoTIFFs } } https://academictorrents.com/download/6b4075043dc071daa380dc1668a0ad79b2bb52b3 @article{, title = {Massachusetts 1:10,000 Coastal Color Orthophoto Images (1994) - MrSID Format}, journal = {}, author = {MassGIS}, year = {}, url = {}, abstract = {Overview These color coastal orthophotographs were generated through a cooperative effort between the Massachusetts Coastal Zone Management Office, the NOAA Photogrammetry Division and the National Geodetic Survey. The data covers most of the coastal zone region. Digital orthophoto production was provided by Photo Science Inc. of Gaithersburg Maryland. The data set is tiled identically to the MassGIS black and white orthophotos for both the mainland and island regions (398 images; see the Coastal Color Orthophotos Index datalayer description). Additionally, one more image was created for Noman's Land and is not based on the same index. Needs Title-coqimg Click to see the full size image. Methodology The color aerial photography was captured in September and October of 1994 by the Photogrammetry Division of NOAA. The scale of the original photography is 1:48,000. Differential airborne GPS was used for control. Approximately 31 flight lines were conducted, with the orientation of the flight lines designed to cover the maximum area of shoreline. Approximately 360 were captured. Approximately 16 ground panels were placed in the field and surveyed. Aerotriangulation was conducted by the Photogrammetry Division utilizing analytical stereo plotters. The control was processed using 3 block areas: A) North of Boston, B) Boston south including the Elizabeth Islands, and C) Martha?s Vineyard with Nantucket. Control was developed to provide an accuracy that exceeds NMAS of 1:10,000. In large portions of the area, control exceeds the NMAS for 1:7,000. Diapositives were scanned for a final output resolution of 1.0 meter. Scanning was done to match the diapositives as closely as possible. Bulk radiometric adjustments of the imagery was conducted using Adobe Photoshop "auto levels" to remove the green haze and to stretch the contrast. Mass point and breakline elevations were created and used in the production. Only mass point elevations are available for the area. Elevation data was developed primarily for the purpose of orthorectification, and not for detailed contouring. Images for Martha's Vineyard and Nantucket were originally georeferenced to the Massachusetts State Plane Island Zone coordinate system, but have been projected in ArcInfo to the Mainland Zone for consistency with other MassGIS data layers. These mainland-zone images for the islands became available in June 2001; the images for all other areas were released in February, 1998. The original one-meter images are 48 MB per tile. Two-meter versions of the images, resampled in ArcInfo, are 12 MB each. The tiles are in TIFF format and are accompanied by .tfw header files for georeferencing in GIS software. In addition, versions of the one-meter images in the MrSID format have been created at 30:1 compression with 8 zoom levels. These are available with .sdw header files as individual MrSID images as well as one single mosaic comprising the entire coastline, including Martha's Vineyard and Nantucket. The one-meter SIDs may be downloaded or ordered on DVD (from the Digital Data Products section of the order form). The MrSID mosaic may be purchased on DVD because of file size considerations.} } https://academictorrents.com/download/ddd95cb0ff0ecca12d4803e4890596f26e1218d0