2009 National Renewable Energy Labratory/Boston Redevelopment Authority Topographic
LiDAR: Boston, Massachusetts
This kmz file shows the extent of coverage for the 2009 NREL/ASE/BRA Boston, MA lidar
The Alliance for Sustainable Energy, LLC contracted with Sanborn to provide LiDAR
mapping services for the Boston area. Utilizing multi-return systems, Light Detection
and Ranging (LiDAR) data in the form of 3-dimensional positions of a dense set of
mass points was collected for approximately 90 square miles. All systems consist of
geodetic GPS positioning, orientation derived from high-end inertial sensors and high-accurate
lasers. The sensor is attached to the aircraft?s underside and emits rapid pulses
of light that are used to determine distances between the plane and terrain below.
Specifically, the Leica ALS-50 LiDAR system was used to collect data for the survey
campaign. The LiDAR system is calibrated by conducting flight passes over a known
ground surface before and after each LiDAR mission. During final data processing,
the calibration parameters are inserted into post-processing software. Lidar Acquisition
Parameters: Instrument: Leica ALS50 Flight Altitude: ~ 1500m AGL Airspeed: ~ 120 Knots
Scan Frequency: 46 Hertz Pulse Rate: 74,400 Hertz Scan Width Half Angle: 25 Degrees
Sidelap: 30% This Lidar survey acheived a point spacing of 1.0 meter.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
- DOE/EERE/NREL > National Renewable Energy Labratory, Office of Energy Efficiency and
Renewable Energy, U.S. Department of Energy
- Alliance for Sustainable Energy, LLC (ASE)
- Boston Redevelopment Authority (BRA)
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||This LiDAR operation was designed to create a data sets that will establish an authoritative
source for elevation information for the city of Boston.
||2009-11-10 to 2009-11-11
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Remote Sensing
- Suffolk County
- Middlesex County
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- Sanborn Map Company performed: 1. Pre and post-flight sensor calibration tests 2.
Data collection 3. Data accuracy validation 4. Final Lidar processing For detailed
information regarding Sanborn's lidar processing steps please see the Lidar Report
in the Supplemental_Information section above for a detailed accuracy report.
- The NOAA Coastal Services Center (CSC) received topographic files in .las V1.1 format.
The files contained lidar elevation measurments, intensity measurements, classification
information, flightline information and return information. The data were received
in Massachusetts State Plane Mainland Zone 2001, NAD83 coordinates and were vertically
referenced to NAVD88 using the Geoid03 model. The vertical units of the data were
feet. CSC performed the following processing for data storage and Digital Coast provisioning
purposes: 1. The topographic las files were converted from las V1.1 to las V1.2. 2.
The topographic las files' GPS Week Time was converted to Adjusted Standard GPS Time.
3. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal
heights using Geoid03. 4. The topographic las files were converted from a Projected
Coordinate System (MA SP Mainland) to a Geographic Coordinate System (NAD83). 5. The
topographic las files' vertical units were converted from feet to meters. 6. The topographic
las files' horizontal units were converted from feet to decimal degrees. 7. The data
were converted to LAZ format.
- The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are currently
being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS or LAZ
The LAS format is an industry standard for LiDAR data developed by the American Society
of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version
LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively
in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically
the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most
up to date geoid model when transforming to orthometric heights.
Metadata Last Modified: 2013-10-17
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