20200225
08401600
1.0
FALSE
Con NormalizedFirstReturns_REF_VoidFill.img 0 R:\Imagery\LiDAR\DerivedData\FirstReturnProcessing\NormalizedFirstReturns_REF_VoidFillCon.img NormalizedFirstReturns_REF_VoidFill.img "VALUE < 0"
nDSM_NH.img
file://R:\Imagery\LiDAR\DerivedData\FirstReturnProcessing\nDSM_NH.img
Local Area Network
208335.852430
361867.852430
4729191.274952
5020367.274952
1
002
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_UTM_Zone_19N
<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/2.9.0'><WKT>PROJCS["NAD_1983_UTM_Zone_19N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-69.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26919]],VERTCS["NAVD88 - Geoid09 (Meters)",VDATUM["unknown"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>-9998100</YOrigin><XYScale>450445547.3910538</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>26919</WKID><LatestWKID>26919</LatestWKID></ProjectedCoordinateSystem>
32
FALSE
None
1
IMAGINE Image
TRUE
continuous
floating point
-3.4028235e+38
20220505
14053000
20220505
14055900
150000000
5000
FGDC
NH GRANIT Database Manager
Earth Systems Research Center
NH GRANIT Database Manager
603-862-1792
603-862-0188
8 College Rd
Durham
New Hampshire
03824
US
granit@unh.edu
20220505
ArcGIS Metadata
1.0
NH GRANIT Database Manager
Earth Systems Research Center
NH GRANIT Database Manager
603-862-1792
603-862-0188
Morse Hall, University of New Hampshire
Durham
NH
03824
US
granit@unh.edu
8:30AM-5PM, EST
No charge when downloaded from the Internet.
ERDAS .img file
Ability to read/import Esri file geodatabase format.
56832.0
Network_Resource_Name: <URL:http://www.granit.unh.edu>
<URL:ftp://ftp.granit.sr.unh.edu/pub/GRANIT_Data/Raster_Data/LiDAR_Derived_nDSM/nDSM_NH.zip>
Raster Dataset
nDSM_NW_HS_NH
2020-06-15
Earth Systems Research Center, University of New Hampshire
Earth Systems Research Center, University of New Hampshire
Durham, New Hampshire
raster digital data
None
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>This data set represents a 2-meter resolution LiDAR-derived normalized Digital Surface Model (nDSM) or Canopy Height Model (CHM) for New Hampshire. It was derived from a statewide LAS Dataset which comprised 8 separate LiDAR collections that covered the state as of January, 2020. The LAS Dataset was used as input to the ArcGIS "LAS Dataset to Raster" geoprocessing tool which converted the LAS first return values to raster values in the output data set. Subsequent processing subtracted the corresponding "bare earth" surface values to produce estimated feature height. It is recognized that this is a simplistic approach to the challenge of estimating LiDAR-based first return heights. Users should recognize this and keep it in mind when using the data. In some areas, users may notice unusual linear edges which appear unlikely or anomalous. The LiDAR vendor explained that these anomalies may be the result of changes in the degrees of tree canopy closure that occurred between the times adjacent flight lines were completed. Although leaf-off conditions were specified for data collection, strict adherence to the project specifications was not possible in all locations and exceptions occurred in order to complete data acquisition in a timely manner. As a result, abrupt discontinuities may be noticeable where data were collected on different dates. Eamples of these anomalies can be found in the areas of Cave Mountain in Bartlett and to the west of Woodstock.</SPAN></P></DIV></DIV>
This data set estimates feature heights above the ground surface, and is one of a suite of topographic datasets available from
NH GRANIT that convey the shape of the Earth's surface.
NH GRANIT LiDAR-Derived Normalized Digital Surface Model - NH (nDSM), 2020, Earth System Research Center, University of NH (http://www.granit.unh.edu)
NH GRANIT Database Manager
Earth Systems Research Center
Database Manager
603-862-1792
603-862-0188
Morse Hall, University of New Hampshire
Durham
NH
03824
US
granit@unh.edu
8:30AM-5PM, EST
United States
Northeast
New England
New Hampshire
ISO 19115 Topic Categories
elevation
first returns
elevation
LiDAR
New Hampshire
first returns
elevation
LiDAR
New Hampshire
United States
Northeast
New England
New Hampshire
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>Please cite NH GRANIT (See Data_Set_Credit). Not for Legal use.</SPAN></P></DIV></DIV>
Digital data in NH GRANIT represent the efforts of the contributing agencies to record information from the cited
source materials. Earth Systems Research Center, under contract to the NH Office of Strategic Initiatives, and in
consultation with cooperating agencies, maintains a continuing program to identify and correct errors in these
data. OSI, ESRC, and the cooperating agencies make no claim as to the validity or reliability or to any implied uses of
these data.
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.6.1; Esri ArcGIS Pro 2.3.3
true
-72.718537
-70.686573
45.323213
42.659909
None
2011-05-06
2018-05-24
One companion data set representing LiDAR-based first return elevations (DSM_NH.img) is also available from NH GRANIT.
1
-72.718537
-70.686573
45.323213
42.659909
The critical attribute of this data is the raster cell elevation, the absolute accuracy of which has been affected by a number of
processing steps. The original LiDAR elevation source DEMs had a 0.7 - 2 meter or better nominal post spacing (GSD).
None
Floating point
None
Data are complete for the State of New Hampshire, and reflect the content of the source datasets.
Created an Esri LAS Dataset comprising Coastal_LiDAR_LAS, Connecticut_River_LiDAR_LAS, Merrimack_LiDAR_LAS, Nashua_LiDAR_LAS,
Umbagog_LiDAR_LAS, WMNF_2011_LiDAR_LAS, WMNF_2012_LiDAR_LAS, and WMNF_2014_LiDAR_LAS.
2019
Coastal_LiDAR_LAS, Connecticut_River_LiDAR_LAS, Merrimack_LiDAR_LAS, Nashua_LiDAR_LAS, Umbagog_LiDAR_LAS, WMNF_2011_LiDAR_LAS,
WMNF_2012_LiDAR_LAS, WMNF_2014_LiDAR_LAS
LAS
Using an ArcGIS model iterator, for each Quarter Quad (QQ) in QQs, ran an in-house ArcGIS Desktop model comprising the
following steps: Buffer the selected QQ polygon by 500 meters - QQ_1; Set process extent to the QQ_1 shape; converted BREAKLINES
to raster - r_BREAKLINES; ran the ArcGIS LAS to Raster tool using LAS first return values as input with an Interpolation Type set
to "Binning", Cell Assignment set to "IDW", and the Void Fill Method set to "Natural Neighbor" - r_DSM; ran the Con tool where
areas within r_BREAKLINES received BAREEARTHDEM elevations while all other areas received values from r_DSM - r_DSM_xxx; subtracted
BAREEARTHDEM from r_DSM_xxx - nDSMxxx.
QQs, BREAKLINES, LAS
nDSMxxx
Final processing included; created a Mosaic Dataset into which all nDSMxxx rasters were loaded - nDSMNHi;
created a Refereced Mosaic Dataset from nDSMNHi and added an Elevation Void Fill Function - nDSMNH_REF_VoidFill;
copied nDSMNH_REF_VoidFill to final statewide ERDAS .img raster - nDSMNH.
nDSMxxx
nDSMNH
Provided hydrography boundaries to hydro-flatten first resturn raster.
Hydro Breaklines
BREAKLINES
Earth Systems Research Center, University of New Hampshire
ground condition
2011-05-06
2018-05-24
Input LiDAR LAS
Coastal New Hampshire 2011 LiDAR collection
Coastal_LiDAR_LAS
2011
Photo Science, Inc.
ground condition
2011-05-06
2011-06-30
Input LiDAR LAS
USGS Connecticut River NH State Plane LiDAR
Connecticut_River_LiDAR_LAS
2016
Quantum Spatial, Inc.
ground condition
2015-10-24
2016-04-29
Input LiDAR LAS
TERRAIN, Merrimack HUC 8 Watershed, Massachusetts and New Hampshire
Merrimack_LiDAR_LAS
2012-09-14
Federal Emergency Management Agency
ground condition
2012-09-14
Input LiDAR LAS
TERRAIN, Nashua, Massachusetts
Nashua_LiDAR_LAS
2011-07-15
Federal Emergency Management Agency
ground condition
2011-01-28
LiDAR LAS
Umbagog NH/ME 2016 LiDAR
Umbagog_LiDAR_LAS
2018-08-30
Quantum Spatial, Inc.
ground condition
2016-04-06
2018-05-24
LiDAR LAS
White Mountain National Forest Lidar (USGS Contract: G10PC00026 Task Order Numbers: G10PD01309 and G10PD00088)
WMNF_2011_LiDAR_LAS
Photo Science, Inc.
ground condition
2010-11-11
2012-04-19
LiDAR LAS
White Mountain National Forest Lidar (USGS Contract: G10PC00026 Task Order Numbers: G12PD00775)
WMNF_2012_LiDAR_LAS
Photo Science, Inc.
ground condition
2012-11-06
2012-11-17
LiDAR LAS
G14PD01014 - White Mountain National Forest3 LiDAR - FY2014
WMNF_2014_LiDAR_LAS
2015-04-10
Quantum Spatial, Inc.
ground condition
2014-10-28
2014-11-06
Tile processing extent
USGS Quarter Quads
QQs
USGS
ground condition
2015
Bare earth DEM
LiDAR_Bare_Earth_DEM_NH
BAREERTHDEM
2019
Earth Systems Research Center, University of New Hampshire
ground condition
2011-05-06
2018-05-24
2
145588
2.000000
76766
2.000000
1
0
208335.852430 4729191.274952
208335.852430 5020367.274952
361867.852430 5020367.274952
361867.852430 4729191.274952
285101.852430 4874779.274952
Data represents LiDAR-based first returns for New Hampshire.
Cell values represent first return elevation in meters.
dataset
EPSG
6.11(3.0.1)
Layer_1
1936.825806
-0.000000
32