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#Free mrsid download usgs map upgrade
#Free mrsid download usgs map series

Well within the 3.0m tolerance defined in the Statement of Work. Theĭiagonal RMSE (XY) was 0.44m (NSSDA statistic was 0.75m). Values read for the corresponding image in the ortho product. Surveyed coordinates for the points were compared with coordinate

Used to test the horizontal accuracy of the 30cm imagery. This fell within the 0.6m tolerance defined in the Statement ofįorty-nine points also acquired by the MassHighway Survey Section were The diagonal RMSE (XY) wasĠ.21m (NSSDA statistic was 0.36m). The surveyedĬoordinates were compared with coordinate values read for theĬorresponding image in the ortho product. Used to test the horizontal accuracy of the 15cm imagery. Twenty-one points acquired by the MassHighway Survey Section were Detailed accuracy reports were delivered to MassGIS. Positional accuracy not to exceed 3 meters RMSE.Įrror XY does not exceed 2.12 meter RMSE in X or Y. The 30cm orthophotos were created to be fully compliant with a horizontal Were created to be fully compliant with a horizontal positionalĪccuracy not to exceed 0.6 meters Root Mean Squared Error (RMSE).Įrror XY does not exceed 0.424 meter RMSE in X or Y. Spatial Data Quality - Horizontal Positional Accuracy The groundĬontrol points were established using GPS for vertical (NAVD 88 Meters) and horizontal (NAD83(NSRS2007) coordinate values (UTM Zone 19N in 2008, Massachusetts Stateplane Mainland US Survey Meters in 2009). Was contracted by the USGS to acquire photo identifiable groundĬontrol points (50 in 2008 and 109 in 2009) during the acquisition of aerial imagery.

This DSM surface is used in the rectification of the orthoimagery.

#Free mrsid download usgs map series

The technician then selected a series of areas from theĭataset and inspected them where adjacent flight lines met. Verified that there were no voids, and that the data covered the To verify that the flight lines met correctly.

Using the DSM, a technician performed a visual inspection of the data.

The auto correlatedĭSM surface represents the initial surface model. Pixel-matching system within the ISTAR software. ISTAR digital surface modeling is based on an auto correlated To process a digital surface model (DSM) for orthorectification of the All imagery was collected using the Leica ADS40-52 digital pushbroom sensor.įor both years' imagery, Fugro EarthData used ISTAR There were eleven sorties and 225 flight lines. The orthophotography was created for use by the USGS, The National Geospatial-Intelligence Agency, and MassGIS. The aerial photography used to create the 2009 digital images was acquired by Fugro Earthdata, Inc. In downtown Boston a "true ortho" method was used to reduce the effects of tall building lean. Photography was flown during leaf-off inĭeciduous vegetation regions. Was collected using a Leica ADS40 digital pushbroom sensor. There were 120Īpproximately 9,440 feet AMT. The 15cm imagery was acquired in seven flights, atĪpproximately 4,800 feet above mean terrain (AMT).

#Free mrsid download usgs map upgrade

acquired the aerial imagery from April 10-18, 2008, flying north-south to support the creation of digital orthophotography with a 15cm pixel (Boston Upgrade areas) and a 30cm pixel (entire Boston MassGIS stores the 2008 portion of the 30cm imagery in ArcSDE as a single raster dataset named IMGCOQ2008_30CM.įugro Earthdata, Inc. It can also serve as a reference layer or basemap for myriad applications inside geographic information system (GIS) software. 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. Additionally, 14 municipalities provided funding for 4-band 15cm imagery to cover their communities. In spring 2009, USGS continued the project and 4-band 30cm imagery was obtained for the remainder of the state. Pixel resolution for these images is 15 centimeters (approximately 6 inches). Pixel resolution is 30 cm., or approximately one foot.Īdditionally, 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. Each band has pixel values ranging 0-255. Image type for the entire region (more than 1.7 million acres) is 24-bit, 3-band (red, green, blue) natural color. 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. The Official Website of the Office of Geographic Information (MassGIS)Ĭolor Ortho Imagery (2008/2009) - April 2008/2009