![aerial map aerial map](https://landiscor.com/wp-content/uploads/2014/09/NashvilleStandard-ClassicScale.jpg)
Radiometric correction software and techniques created orthophoto files that minimize the appearance of image seams without loss of feature signature.
![aerial map aerial map](https://www.mapsland.com/maps/asia/south-korea/large-satellite-map-of-korean-peninsula.jpg)
This step resulted in spatial and radiometric transformation of the digital images from line/sample space into NAD 1983 2011 UTM zones 18N (for the western part of the state) and 19N (for the eastern part of the state). Utilizing all four bands, Quantum Spatial performed digital orthorectification using bilinear interpolation algorithms. Horizontal accuracy tested 0.1 meters RMSEx, RMSEy and RMSEr. These values were then compared to the surveyed control point x and y values. The x and y positions of where the check points fell on the orthoimagery were collected. In order to post process the imagery data to meet task order specifications and meet ASPRS horizontal accuracy guidelines, Quantum Spatial used 132 ground control/check points that were distributed throughout the project area and were surveyed using GPS techniques.
![aerial map aerial map](https://landiscor.com/wp-content/uploads/2014/09/DenverStandard-ClassicScale.jpg)
The imagery was exposed at altitudes between 7,200 and 8,500 ft above mean terrain across 183 flight lines.
![aerial map aerial map](https://printablemapforyou.com/wp-content/uploads/2019/03/united-states-map-and-satellite-image-live-satellite-map-california.jpg)
The imagery was supplemented with the simultaneous acquisition of airborne GPS/IMU data, which captured the ground coordinate for the nadir point of each photograph. Imagery was collected between March 24 and April 25, 2019, before most deciduous trees were in bloom, and while no snow was on the ground and rivers were at or below normal levels. using Vexcel UltraCam Eagle M1 and M3 digital mapping cameras. ProductionĪerial imagery was acquired by Quantum Spatial, Inc. The imagery can also serve as a reference layer or basemap for myriad applications inside geographic information system (GIS) software and web-based maps. These images 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. These data also support The National Map. This digital orthoimagery was created to provide easily accessible geospatial data which are readily available to enhance the capability of federal, state, and local emergency responders, as well as to plan for homeland security efforts. The data were developed based on a horizontal projection/datum of NAD 1983 2011 UTM zones 18N and 19N meters and a vertical projection/datum of NAVD 88 (GEOID 12B) meters. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. National Grid (USNG), taking the coordinates of the southwest corner of the tile. The tile naming convention is based on the U.S.
Aerial map free#
To allow for easier distribution of this free imagery, MassGIS compressed the GeoTIFFS into the JPEG 2000 format, which retains the IR band. The data were delivered in early 2020 as 10,218 individual 1,500 m x 1,500 m tiles in a GeoTIFF format. Funding was provided by MassDOT, the Executive Office of Energy and Environmental Affairs, the State 911 Department, the Executive Office of Technology Services and Security (EOTSS) and the Massachusetts office of the Natural Resources Conservation Service (NRCS). Geological Survey for statewide, 15 cm resolution, 16-bit, 4-band (RGB-IR) digital orthophotos. In spring 2019, MassGIS partnered with the U.S.