2007 JALBTCX Topographic Lidar: Saipan, CNMI
These files contain topographic lidar data collected by the CHARTS system in Saipan,
CNMI. This file contains both first and last returns. The data points representing
bare earth have been classified as such using TerraScan. Classification values are:
Class 1: Unclassified Class 2: Ground
Cite this dataset when used as a source.
|Search and Download
||NOAA Coastal Services Center
Documentation links not available.
- Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA),
National Ocean Service (NOS), Coastal Services Center (CSC)
- Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX)
- NOAA's Ocean Service, Coastal Services Center (CSC)
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||This data set was collected for the CNMI Coastal Resources Management Office, CNMI
Department of Public Works, and the CNMI Emergency Management Office. The U.S. Army
Corps of Engineers, Honolulu District project manager was Milton Yoshimoto (contact
number: 808-438-2250). A footprint of this data set may be viewed in Google Earth
||The purpose of this survey is to collect topographic lidar across the island of Saipan
to support the production of 2-foot contours.
| Use Limitations
- Any conclusions drawn from the analysis of this information are not the responsibility
of JALBTCX, the Coastal Services Center, or its partners. Disclaimer While every
effort has been made to ensure that these data are accurate and reliable within the
limits of the current state of the art, NOAA cannot assume liability for any damages
caused by any errors or omissions in the data, nor as a result of the failure of the
data to function on a particular system. NOAA makes no warranty, expressed or implied,
nor does the fact of distribution constitute such a warranty.
||2007-05-06 to 2007-05-09
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- United States Territory
- Commonwealth of the Northern Marianas Islands (CNMI)
| Use Constraints
- Use Constraints: Users should be aware that temporal changes may have occurred since
this data set was collected and some parts of this data may no longer represent actual
surface conditions. Users should not use this data for critical applications without
a full awareness of its limitations.
| Access Constraints
|| Fee information not available.
2007 CNMI Saipan CHARTS Survey
- Description of Source: Source Contribution: LidarSource Type: hard drive
- Temporal extent used:
2007-05-06 to 2007-05-09
|| Lineage statement not available.
- NOAA Coastal Services Center
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| Processing Steps
- These data were collected using the CHARTS system. It is owned by the Naval Oceanographic
Office (NAVO) and operated through contract. The system collects topographic lidar
data at 20kHz and hydrographic data at 3kHz. The system also collects RGB imagery
at 1Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well.
Aircraft position, velocity and acceleration information are collected through a combination
of Novatel and POS A/V equipment. Raw data are collected and transferred to the office
for downloading and processing in SHOALS GCS software. GPS data are processed using
POSPac software and the results are combined with the lidar data to produce 3-D positions
for each lidar shot. These data are edited using Fledermaus software where anomalous
data are removed from the dataset. The edited data are written to the national grid
system 1 km tiles using chartsLAS, a program written by NAVO. This program reads data
from the original binary format files and produces separate ASCII files for first
and last return data. Using a model calculated by NAVO, data were converted from ellipsoid
to Mean Sea Level heights using the program datum_shift, written by NAVO. The model
file Saipan_Adjustment.fin was used for the corrections. The LAS files output form
chartsLAS were read into TerraScan and filters were applied to classify ground points.
Points designated as ground are assigned a classification value "2" and all other
points are assigned the classification value "1" which represents an unclassified
- The NOAA Coastal Services Center (CSC) received files in LAS format. The files contained
Lidar intensity and elevation measurements. CSC performed the following processing
on the data for storage and provisioning purposes within Digital Coast: 1. The data
were converted from UTM coordinates to geographic coordinates (WGS84). 2. The LAS
georeferencing information was updated to reflect the tidal vertical datum Mean Sea
Level (MSL). 3. The LAS headers were updated and sorted by latitude.
- The NOAA National Geophysical Data Center (NGDC) received Lidar data files by ftp.
The data received compressed containing LiDAR data from the NOAA Coastal Services
Center. The data are currently being served via Digital Coastl at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are provided in LAS format.
LAS format is an industry standard for serving LiDAR data. The data are exclusively
in geographic coordinates, however, the datums used vary. Most are NAD 83, however
some are in ITRF. Vertical systems include both ellipsoid (ITRF and NAD 83) and NAVD
88. For NAVD 88 values, Geiod 03 is primarily used; however, data received in NAVD
88 prior to 2003 was processed using Geoid 99.
Metadata Last Modified: 2011-11-19
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