New York State Department of Environmental Conservation, Division of Water, Watershed GIT Support Group
20090921
Oneida County 2009 LiDAR Data Collection, NY (NYSDEC)
tabular digital data
Albany, NY
NYSDEC
Summary of the surface elevation data collection project in Oneida County, NY (NYSDEC) 2009. Products generated include LiDAR point data in LAS Binary format v1.1.
Support of FEMA's Floodplain Map Modernization Program. Multiple other uses expected.
In the spring of 2009, the Sanborn Map Company, Inc. (Sanborn) acquired 20 square miles of terrestrial LiDAR data in Oneida County, NY. The Leica ALS50 Airborne LiDAR sensors were used for the collection of Oneida County, NY only. The LiDAR data associated with this metadata file is in LAS binary format, version 1.1 (ASPRS specification, see Cross References).
en
20090502
20090502
ground condition
None planned
42.7450
43.9551
47.87300
47.76700
585000.000000604500.0000004574250.0000004595250.000000
EDI Thesaurus
LiDAR Point Cloud
LiDAR
ISO 19115 Topic Category
elevation
006
GCMD Science Keywords
EARTH SCIENCE > Land Surface > Topography > Terrain Elevation
none
custodial
Geographic Names Information System
New York
Oneida
None
1. The NYS DEC asks to be credited in derived products.
2. Secondary Distribution of the data is not allowed.
3. Any documentation provided is an integral part of the data set. Failure to use the documentation in conjunction with the digital data constitutes misuse of the data.
4. Although every effort has been made to ensure the accuracy of information, errors may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other condidions.
New York State Department of Environmental Conservation, Division of Water
mailing and physical address
625 Broadway, 4th floor
Albany
NY
12233-3504
USA
518-402-8185
watergis@gw.dec.state.ny.us
NYSDEC Classification System Aug.06
Unclassified
None
Federal Emergency And Management (FEMA)FEMA Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix A: Guidance for Aerial Mapping and Surveying20030430documentWashington, DCFEMAIn Guidelines and Specifications for Flood Hazard Mapping Partners, FEMA defines technical requirements, product specifications for Flood Hazard Maps and related National Flood Insurance Program (NFIP) products, and associated coordination and documentation activities.http://www.fema.gov/library/file;jsessionid=D0EF44533EDCE583281BE729E8827AA3.WorkerLibrary?type=publishedFile&file=frm_gsaa.pdf&fileid=67b09a60-95e8-11db-b057-000bdba87d5bLAS_Binary v1.1Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.4.1420Sanborn20080523Oneida County Network SurveydocumentOneida County network adjustment results can be found in the document titled "OneidaCo_AdjustReport.html" On record at Sanborn, 1935 Jamboree Dr. Suite 100, Colorado Springs, CO 809201935 Jamboree Drive, Colorado Springs, CO 80920SanbornNational Geodetic Survey20080221Oneida NGS DatasheetsdocumentNational Geodetic SurveySilver Spring, MDThe following NGS control stations were used in the network survey and aerial data collection for the Oneida County LiDAR campaign:
OE0678; AA7914; OE1686; AA7945
Information on these control stations can be found on the NGS datasheets.http://www.ngs.noaa.gov/cgi-bin/ds_pid.prlLiDAR Exchange Format - LAS version 1.1http://www.asprs.org/society/committees/standards/asprs_las_format_v11.pdfAmerican Society for Photogrammetry & Remote Sensing 20050307UnknowndocumentAll information regarding the LAS file format and attribution information can be found in the .pdf file titled "LAS Specification Version 1.1 March 07, 2005"Bethesda, Maryland 20814-2160The American Society for Photogrammetry & Remote Sensing
1. LiDAR data was collected and processed in accordance with FEMA guidelines as published in Appendix A (see Cross References)
2. See vertical position accuracy below.
The 2009 Oneida County LiDAR data associated with this metadata file completely covers the project-specified boundary with no data voids caused by acquisition or sensor issues.
The LiDAR data horizontal accuracy is in compliance with the National Standard for Spatial Data Accuracy (NSSDA) RMSE estimation of elevation data in support of 2ft. contour mapping products as it is referenced in the FEMA guidelines for flood hazard mapping, appendix A (see Cross References).
1.000 m RMSE
Horizontal error associated with this LiDAR data set is a function of several factors including acquisition practices, height of the sensor above terrain, point spacing, diameter of the pulse footprint, network control station coordinates, kinematic GPS solutions, IMU calibration and post-processing functions.
The LiDAR data vertical accuracy is in compliance with the National Standard for Spatial Data Accuracy (NSSDA) RMSE estimation of elevation data in support of 2ft. contour mapping products as it is referenced in the FEMA guidelines for flood hazard mapping, appendix A (see Cross References). The Sanborn Map Company has performed a data accuracy validation and found this data to be in compliance. Additionaly, The New York State Department of Environmental Conservation performed a ground control analysis of the Oneida LiDAR data using ground control checkpoints in several land cover classes and found the resultant RMSE in the exposed ground class to be within the contract specifications of 0.185 meters.
0.185 m RMSE
Vertical error associated with this LiDAR data is a function of several factors including acquisition practices, height of the sensor above terrain, point spacing, diameter of the pulse footprint, network control station coordinates, kinematic GPS solutions, IMU calibration and post-processing functions.
Sanborn
20080718
Report of Survey - Ground Control
document
Ground Control points in UTM Zone 18 North referenced to NAD83 and NAVD88 (Geiod03) in meters.
On record at Sanborn, 1935 Jamboree Drive, Suite 100, Colorado Springs, CO 80920
1935 Jamboree Drive, Colorado Springs, CO 80920Sanborn
Not Applicable
20080504
ground condition
Oneida County Ground Control Points
Ground Control: X,Y,Z
459133.151,4769045.349,218.742
464445.106,4752460.779,376.923
452914.288,4769551.896,165.632
452130.025,4767549.58,188.531
458199.748,4763981.579,253.89
458714.144,4754541.98,371.848
461532.65,4754161.554,327.562
456035.649,4769730.293,193.898
449748.963,4769514.902,144.413
457818.884,4757734.459,381.875
462243.392,4754061.286,298.69
475882.681,4774700.129,131.495
475654.892,4748942.646,464.32
480333.653,4755969.32,332.68
477724.073,4766701.171,186.013
469521.309,4769705.044,170.806
461245.37,4769043.657,212.862
446985.148,4777174.482,137.354
441010.711,4780576.686,114.791
443043.037,4787320.571,128.487
451636.488,4786085.881,122.372
464260.827,4782206.147,135.351
469380.093,4780641.582,165.187
472734.225,4778830.78,132.899
470511.849,4751038.98,383.255
479995.361,4749190.784,372.268
479196.405,4761458.242,245.876
474992.195,4769472.171,170.213
453804.306,4774092.631,170.3
441891.27,4778259.985,120.114
440884.897,4783686.38,114.373
447314.203,4788124.531,117.326
456190.216,4786053.433,126.347
465980.488,4786372.014,145.986
484449.39,4791826.874,243.087
479339.6,4787769.116,197.708
478467.621,4794957.413,277.604
456686.535,4789190.954,136.839
449042.613,4795245.528,185.157
440046.796,4798566.404,146.664
447652.832,4804380.148,297.463
454183.238,4804793.288,341.903
463265.463,4807759.035,413.632
470113.54,4812589.911,407.368
478435.603,4810770.572,376.869
482489.585,4801115.548,377.095
473533.702,4814411.363,343.384
464550.778,4790047.934,146.722
467725.316,4793684.28,170.573
470943.473,4796931.586,181.683
474982.311,4796258.923,266.351
478299.294,4791232.784,299.496
482096.828,4789424.806,268.547
484693.738,4795022.135,343.94
481855.445,4807201.539,364.649
452413.019,4792324.391,164.44
443423.592,4795754.59,167.997
442640.463,4802960.551,252.058
452143.665,4802687.312,319.717
457447.468,4807061.454,406.726
467061.207,4809925.199,469.662
Data collection:
Using Sanborn's Leica ALS50 (SN# 49) Light Detection And Ranging (LiDAR) system, 12 flight lines of standard density (1.4 meter ground sample distance) data were collected over areas in Oneida County, NY (approximately 20 square miles). Multiple returns were recorded for each laser pulse along with an intensity value for each return. The data acquisition occurred in missions between May 02, 2009. During the LiDAR campaign, the Sanborn field crew conducted a GPS field survey to establish final coordinates of the ground control stations for final processing of the base-remote GPS solutions.2009Jamie YoungSanborn Map Company, Inc.LiDAR General Managermailing and physical address1935 Jamboree Drive Suite 100Colorado SpringsColorado80920United States719.264.5602N/A719.264.5637jyoung@sanborn.com8:00 AM - 5:00 PM MSTAirborne GPS processing:
Airborne GPS data was differentially processed and integrated with the post processed IMU data to derive a smoothed best estimate of trajectory (SBET). The SBET was used to reduce the LiDAR slant range measurements to a raw georeferenced point.
Airborne GPS is differentially processed using the GrafNAV v7.50 software by Waypoint Consulting of Calgary, Alberta, Canada.
The georeferenced point cloud was generated in ALTM software by Leica Inc.2009Jamie YoungSanborn Map Company, Inc.LiDAR General Managermailing and physical address1935 Jamboree Drive Suite 100Colorado SpringsColorado80920United States719.264.5602N/A719.264.5637jyoung@sanborn.com8:00 AM - 5:00 PM MSTWaypoint Consulting - GrafNav v7.50IMU data processing:
IMU data provides information concerning roll, pitch and yaw of collection platform during collection event. IMU information allows the pulse vector to be properly placed in 3D space allowing the distance from the aircraft reference point to be properly positioned on the elevation model surface. IMU data is processed using the POSPac v4.2 software by Applanix Corporation of Richmond Hill, Ontario, Canada.2009Jamie YoungSanborn Map Company, Inc.LiDAR General Managermailing and physical address1935 Jamboree Drive Suite 100Colorado SpringsColorado80920United States719.264.5602N/A719.264.5637jyoung@sanborn.com8:00 AM - 5:00 PM MSTApplanix - POSPac v4.2LiDAR point classification
The classification and quality control (QC) of LiDAR data is carried out using TerraScan software v. 8.003 by Terrasolid Limited of Helinski, Finland. The bare earth extraction from the point cloud is the result of a morphological processing routine run in TerraScan. A set of user-defined distances and angles are used by the software to build a ground surface from established 'aerial low seed points'. The reclassifying of the data in areas of overlapping scans is done before the classification of the LAS ground points (DEM). This means the point cloud from which the ground points are extracted is more uniform in terms of point density.
The 'cut-overlap' process is performed with the aid of the aircraft trajectory (reduced to the sensor's trajectory) and the scan angle value within the LAS data. For this project, the value used for cutting the overlap was 25 degrees. This means that data from a single scan greater than 12.5 degrees off nadir was classified to class 12 overlap. Using the trajectory and embedded angle information, the software (TerraScan) is able to properly reclassify the overlap points so that the remaining point cloud is edge-matched. That is to say, there are no data voids within the point cloud with class 12 overlap points turned off. 2009Jamie YoungSanborn Map Company, Inc.LiDAR General Managermailing and physical address1935 Jamboree Drive Suite 100Colorado SpringsColorado80920United States719.264.5602N/A719.264.5637719.264.56378:00 AM - 5:00 PM MSTTerraSolid - TerraScan v.8.000Output LAS files
The tiling and final LAS file creation was performed using LiDAR CuePac v5.0 from GeoCue Corporation of Madison, Alabama, USA. By client specification, the LiDAR point cloud data were cut to square, 750 x 750 meter (~56 Ha, 140 acres) tiles. The naming convention used for the tiles is based on the truncated grid coordinate at the southwest corner point of origin of the tile.2009Jamie YoungSanborn Map Company, Inc.LiDAR General Managermailing and physical address1935 Jamboree Drive Suite 100Colorado SpringsColoradoColoradoUnited States719.264.5602N/A719.264.5602jyoung@sanborn.com8:00 AM - 5:00 PM MSTGeoCue - LiDAR CuePac v5.0Summary and algorithms for filtering data:
The classification algorithms used on the LiDAR point cloud involved several iterative steps including the removal of low points and other outlyers, the culling of overlap data, and finally the classification of the LiDAR DEM. This process begins with automated routines and ends with a 100% manual edit and QC check of the data. Once the data set classification accuracy was deemed sufficient and no quality issues were found, a final vertical accuracy assessment was performed on the LiDAR DEM.2009Jamie YoungSanborn Map Company, Inc.LiDAR General Managermailing and physical address1935 Jamboree Drive Suite 100Colorado SpringsColorado80920United States719.264.5602N/A719.264.5637jyoung@sanborn.com8:00 AM - 5:00 PM MSTData Validation
The final LiDAR LAS 1.1 was created in UTM Zone 18 North, referenced to NAD83 and NAVD 88, in meters. The final LiDAR DEM was verified against FEMA checkpoints in order to perform a redundency check against the GPS solutions. These accuracy checks also verified that the data meets the guidelines outlined in FEMA's Guidelines and Specifications for Flood Hazard Mapping Partners and Appendix 4B, Airborne Light Detection and Ranging Systems.
Not Applicable2009Not ApplicableLiDAR Acquisition ParametersThe following values are nominal and were taken directly from the LiDAR flight planning software for the Optech system (ALTM-NAV PLanner v.2.0.52) and the Leica system (ALS50 spreadsheet). Several variables could have affected these figures including wind speed, air turbulence, pilot error and subtle changes in terrain.
Optech: The areas of interest were flown at an altitude of 1200 meters (3937 feet) above mean terrain.
Airspeed - 120 knots.
Laser Pulse Rate - 50,000 Hz,
Full Field of View - 40 degrees,
Scane Rate - 32 Hz,
Swath Width - 1019 meters.
Leica: The areas of interest were flown at an altitude of 1500 meters (4921 feet) above mean terrain.
Airspeed - 120 knots.
Laser Pulse Rate - 55,000 Hz,
Full Field of View - 40 degrees,
Scane Rate - 32 Hz,
Swath Width - 1092 meters.Sanborn20080220UnknownOneida County LiDAR Acquisition Parameters1935 Jamboree Drive, Suite 100, Colorado Springs, CO 80920SanbornLiDAR Acquisition Plan for Oneida County, NY
On record at Sanborn, 1935 Jamboree Drive, Suite 100, Colorado Springs, CO 8092020080220publication date
The 2009 Oneida County LiDAR data associated with this metadata file has met all quality checks in terms of relative accuracy, absolute accuracy, coverage. and point and file format. The relative accuracy of the LiDAR data refers to how well the data set matches within itself. That is to say, adjacent LiDAR scans are in alignment with each other with no vertical or horizontal shifts caused by improper calibration and/or georeferencing. The absolute elevation has been validated by both Sanborn and NYS DEC. This was done by comparing the LiDAR ground surface against known ground control points. The data file format and point attribution is in compliance with the LAS version 1.1 specifications (see ASPRS LAS1.1 cross reference).
Point
coordinate pair
0.01
0.01
meters
Universal Transverse Mercator180.999600-75.0000000.000000500000.0000000.000000
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
0.2982572221010
GCS_North_American_1983NAD_1983_UTM_Zone_18N
North American Vertical Datum of 1988 (Geoid03)
0.01
meters
Implicit coordinate
New York State Department of Environmental Conservation
DIS GIS Unit
mailing and physical address
625 Broadway
3rd Floor
Albany
NY
12233-2750
USA
(518) 402-9860
Downloadable Data
New York State Department of Environmental Conservation (NYS DEC) provides these geographic data "as is." NYS DEC makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. NYS DEC further makes no warranty, either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on a computer system at NYSDEC, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. NYS DEC shall not be held liable for improper or incorrect use od the data described and/or contained herein.
0.0020.00220091921
20090921
Sanborn Map Company, Inc.
Shawn Benham
Project Manager
mailing and physical address
1935 Jamboree Dr. Suite 100
3rd floor
Colorado Springs
CO
80920
USA
719-502-1296
719-528-5093sbenham@sanborn.com8:00 AM - 5:00 PM MSTN/A
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
enhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile
2008071515510600FALSE2009092111165000{931C7148-4C30-4826-87D4-DDEDD3EE7E6B}2008071515574900Local Area Network0020.002Shapefile20090921Raw LAS binary
NAD83 UTM Zone 18, NAVD88 - Geiod03 - Meters
LAS Version 1.1
Classification:
1 - Unclassified
2 - Bare Earth
7 - Low Points
12 - OverlapThe LAS file is version 1.1 (see ASPRS LAS 1.1 cross reference) and includes the following information at the file level: GUID (project identifier), file creation day and year, Variable Length Records (VLR) which include file projection information. The LAS 1.1 file contains the following information at the point level: Grid coordinate (x,y,z), 8-bit intensity value, return number, scan direction, classification value, Point Source ID (flight-line delineator), GPS Time (GPS seconds of the week). The Point Source ID is an arbitrarily assigned number that is only used to delineate LAS data between different LiDAR scans. The Point Source IDs in this dataset were incremented in chronological order following the LiDAR collection. That is to say line No. 36 was collected after line No. 35. GPS seconds of the week are referenced to UTC time and begin at 00:00:01 Sunday morning and end at 24:00:00 Saturday midnight.
ClassificationStandard ASPRS classifications as defined in the values below.LAS Version 1.1, POINT DATA RECORD FORMATN/AN/A20080504200805071Unclassified PointSanborn2Bare Earth PointSanborn7Low Points (noise) - Outlyer Point ClassSanborn12Overlap: Flight Line Overlap PointSanbornIrregularElevationGrid Z CoordinateLAS Version 1.1, POINT DATA RECORD FORMAT0.185 m RMSEBare Earth points checked against ground control points in flat, open terrain2008050420080507N/ASanborn does not have at present tools to provide the min/max elevation across all classes or each class independentlySanbornIrregularIntensity8-bit LiDAR return intensity valueLAS Version 1.1, POINT DATA RECORD FORMAT2008050420080507N/AN/A0255N/AN/AN/A1IrregularAirborne LiDAR Data Point RecordsLiDAR for Oneida County, NYSanbornReturn NumberIrregularLAS Version 1.1, POINT DATA RECORD FORMATLiDAR Return Number1First returnAirborne LiDAR System2Second returnAirborne LiDAR System3Third ReturnAirborne LiDAR System4Fourth ReturnAirborne LiDAR System2008050420080507N/AN/AScan Direction FlagDenotes direction of scanner mirror at time of output pulseLAS Version 1.1, POINT DATA RECORD FORMATN/AN/AIrregular200805041positive scan direction - mirror scanning to the right of aircraft along direction of flightAirborne LiDAR System0negative scan direction - mirror scanning to the left of aircraft along direction of flightAirborne LiDAR System20080507GPS TimestampGPS seconds of the week are referenced to UTC time and begin at 00:00:01 Sunday morning and end at 24:00:00 Saturday midnight.LAS Version 1.1, POINT DATA RECORD FORMATN/AN/AIrregular200805040604,799N/AN/AN/A0.00000120080507Point Source IDThe Point Source ID is an assigned number delineating flightline information. The point source ID is sequential and chronological in the order the flightlines were collected. The correlated point source ID is also found in the 'num' field of the associated flighline shapefiles: "2008_Oneida_LiDAR_Optech_Collect.shp" and "2008_Oneida_LiDAR_Leica_Collect.shp"LAS Version 1.1, POINT DATA RECORD FORMATN/AN/AIrregular200805041 - 127flightline sequential number Terrasolid Limited20080507Total Returns by PulseThe total number of returns for a given pulse. Directly follows Return Number attribute in the LAS file architecture.LAS Version 1.1, POINT DATA RECORD FORMATN/AN/AIrregular200805041One total return for pulseAirborne LiDAR SystemAirborne LiDAR System2Two total returns for pulseAirborne LiDAR System3Three total returns for pulseAirborne LiDAR System4Four total returns for pulse20080507Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.4.1420OneidaDEC2008585000604500459525045742501-73.98447-73.74791741.5043741.3129491ISO 19115 Geographic Information - MetadataDIS_ESRI1.0datasetNAD_1983_UTM_Zone_18N1