How to Set an Autocad Drawing to State Plane Massachusetts

Tile Grid and Coordinate Arrangement

Click image to view full-size reference image.

File Name: BOS3D Tile Filigree
Updated: July 6, 2021
Formats: Autodesk DXF, Trimble Sketchup, ESRI Shapefile, GeoJSON

Tiling Strategy

The tiling scheme for the BPDA's 3D model serves every bit a framework for sharing a detailed model of metropolitan extent with design tools that are limited in terms of spatial extent and file-size. By dividing the city-wide model components into snap-together modules, the tile grid provides a framework for registering model collections and terrain meshes that can be precisely snapped together and draped with a variety tiled groundplan images.

Metro Boston 3D Coordinate System

Surveyors and engineers in Massachusetts prepare their official drawings using the Massachusetts Country Plane Coordinate System with coordinates expressed in Feet. The origin of the Country Plane grid lies outside the state, which makes coordinate references much larger numbers than near most 3D modeling tools tin can bargain with gracefully. The creators of AutoCAD, 3DsMax, Rhino, SketchUp and Blender all recommend moving geospatially referenced geometry closer to the origin to avoid problems of precision when creating, transforming or rendering.

To facilitate on-going commutation of 3D models, the BPDA has chosen a default offset that places the origin to the South-West of Boston and neighboring cities. We expect modelers to apply projection-specific coordinate origins. Preserving the Metro3D insertion point and a tile boundary with models will make it easy to incorporate updates and substitution models with other Metro 3D Boston users whith perfect geo-registration.

Projected Coordinate System: State Airplane Massachusetts Mainland (Anxiety), N American Datum of 1983.
Vertical Coordinate System for 3D data: North American Vertical Datum, 1988 (NAVD 88) Feet (Height)
Origin / Kickoff / Insertion Point
The origin of the Metro 3D Boston coordinate system serves as the insertion bespeak for models.

• Country Plane Coordinates:
  • X:731,100 anxiety
  • Y:2,902,900 feet
• Geographic:
  • Longitude: 71.223391 Due west
  • Latitude: 42.213379 Northward

To align Metro 3D Boston filigree with True Northward: Rotate 0.34 Degrees clockwise.

To georeference SketchUp tiles for interoperability with SketchUp's geolcoation tools, run into the Notes at the bottom of the SketchUp Models page.

Tips for Geo-Location and Integrating Updates

Maintain geolocation in your models to easily integrate updates from other Metro Boston 3D collaborators.

• When importing this reference grid into your model be sure to specify units of Feet and check the tile-width (5000 feet) to be sure.
• Define your model origin, orientation, and calibration to suit your project's requirements.
• Keep the Metro 3D insertion point and tile purlieus in your project to assure easy and precise registration of updates from other Metro Boston 3D sources with your projection and vice-versa.
• To import new models from Metro 3D Boston users, snap to the original insertion point. Information technology may no longer be at 0,0,0, just it is the relative location that counts.
• To prepare your models for exchange with other Metro Boston 3D collaborators:
  1. shift selected geometry with the insertion point dorsum to 0,0,0. Scale and united nations-rotate, if necessary, to marshal the upper-right corner of your tile boundary with the reference filigree.
  2. Now you can export or import geometry for easy snap-in registration!

Download City-Wide Tile Grid Resources

• ArcGIS Projection file for Metro 3D Boston coordinate system.
• Tile reference paradigm in .OBJ format or JPEG.
• Tile Polygons and Points (including insertion-point and bounding rectangle)
  • SketchUp format.
  • DXF format Metro Boston 3D coordinate system or Un-shifted State Airplane Anxiety -- useful for registering data layers from unshifted Country-Airplane information-sets.
  • Shapefile format. useful for clipping ground plan images or vector data to precisely register with tiled models.
  • GeoJSON format. Helpful for automating processes that involve coordinate transformation of tiled models (see Data Dictionary, beneath.

Data Lexicon for Tile Grid Aspect Table

This aspect tabular array is a reference for tile identifiers and tile-center coordinates.

Since the tiles are 5000 feet and square with the State Plane grid, eht state-plane coordinates fom the corners can be calculated by adding or subtracting 2500 feet frm the heart coordinate.

Field Name	Blazon	Description
Town_Code	Text	A 3 letter abbreviation of the town name.
Tile_Label	Text	a hyphenated label consisting of the alphabetic character designating the tile column and the number reflecting the tile row.
Tile_ID	Text	A concatenation of the Town_Code, underscore, and the Tile_Label string. This identifier is used for naming tiled models and folders elminates tile name conflicts for modeling projects that span multiple towns.
Center_Lat	Text	The latitude of the center of the tile. Assuming the WGS84 globe model.
Center_Lon	Text	The longitude of the center of the tile. Assuming the WGS84 earth model.
BosShift_X	Text	The Ten coordinate of the tile middle. Metro Boston 3D coordinate arrangement
BosShift_Y	Text	The Y coordinate of the tile middle. Metro Boston 3D coordinate system
MASP_X	Text	The X coordinate of the tile center. Massachusetts State Plane (Mainland, Anxiety) coordinate system
MASP_Y	Text	The Y coordinate of the tile centre. Massachusetts State Plane (Mainland, Feet) coordinate organization

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Source: https://maps.bostonplans.org/3d/catalog/tile_grid.htm