Planimetry_2017 (FeatureServer)

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Service Description: Planimetric features derived from aerial photoagraphy for Easton, Massachusetts

Service ItemId: 4b724415a5e0480e83b036c82858a285

Has Versioned Data: false

Max Record Count: 2000

Supported query Formats: JSON

Supports applyEdits with GlobalIds: True

Supports Shared Templates: True

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Description: This dataset was created to provide vector mapping of planimetric features derived from aerial photography.

Photo Acquisition - The aerial photographic mission was carried out on April 12, 2017. 459 exposures were taken in 16 flight lines at 3300' AMT resulting in a pixel resolution of 0.22' . The photography was collected with 60% overlap to ensure proper stereo viewing
Aerial Triangulation - The digital photographs were triangulated using KLT software. The interior orientations of each photo were measured, the photos were tied togther within flight lines and lastly each flight line was tied, creating one single unified block. This block was then projected into Massachusetts State Plane NAD 83 coordinates using the14 aerial photo ground control points that were collected by traditional survey. RMS formulas were used to compute error propagation and reduce error.
Data Capture - Vector data was collected using the subsequent aerial triangulation which allows photogrammetrists to view the photography in stereo. Data was captured using KLT sofware which allows the user to collect in 3D space in the coordinate system established during aerial triangulation. Each data set was collected on its own layer, which allows the data to be imported into the GIS database. The data was collected at scale of 1"= 40'
CAD processing - The vector data collected through the stereocompilation process is edited in KLT Atlas software. Data is checked for errors and then converted into AutoCAD .dxf format.
GIS geodatabase production- The AutoCAD .dxf file is imported into ESRI ArcGIS 10.5.1 where a topology is run to eliminate any gaps that may exist in the data. The data is then separated into the appropriate layers as defined in the database design. A topology check is then run on the data prior to delivery to check for inconsistencies.

Copyright Text: Town of Easton, MA

Spatial Reference: 102686 (2249)

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Units: esriFeet

Child Resources: Replicas Info SharedTemplates

Supported Operations: Query ConvertFormat Get Estimates Create Replica Synchronize Replica Unregister Replica