2m 3x3 DEMs

Raster Dataset - GRID


Keywords
Theme: LAS, LIDAR, Grid
Place: South Central Nebraska
Temporal: 2009

Description

Abstract

2 meter resolution ESRI rasters were created from the ground classified lidar points. They were based on the original tiling system and were exported to be 3 tiles by 3 tiles in size. Not all tiles were full tiles, so not all of these DEMs will be the full 15,000m by 15,000m.

Purpose

These were created to provide the partners with an additional format for the LiDAR data that requires less storage.


Status of the data
Complete
Data update frequency: None planned

Time period for which the data is relevant
Date and time: 20100602
Description:

ground condition


Publication Information
Who created the data: Nebraska Department of Natural Resources
Date and time: 20100603

Data storage and access information
File name: a10
Type of data: raster digital data
Location of the data:
  • http://dnr.ne.gov/floodplain/lidar.html
Data processing environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850
Accessing the data
Size of the data: 174.836 MB
Data transfer size: 174.836 MB

Constraints on accessing and using the data
Access constraints: Unknown
Use constraints:

Unknown


Details about this document
Contents last updated: 20100604 at time 09535000
Who completed this document
Staci L. B. Parent
REQUIRED: The person responsible for the metadata information.
Nebraska Department of Natural Resources
REQUIRED: The organization responsible for the metadata information.
physical:

301 Centennial Mall South

Lincoln, NE 68509

402-471-2363 (voice)

Standards used to create this document
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention used in this document: local time
Metadata profiles defining additonal information

Spatial

Horizontal coordinate system
Projected coordinate system name: NAD_1983_UTM_Zone_14N
Geographic coordinate system name: GCS_North_American_1983
Details

Altitude System Definition
Datum Name: North American Vertical Datum of 1988
Resolution: 0.001
Distance Units: meters
Encoding Method: Implicit coordinate

Bounding coordinates
Horizontal
In decimal degrees
West: -100.91
East: -96.8
North: 41.4
South: 39.9
In projected or local coordinates
Left: 535000.000000
Right: 550000.000000
Top: 4439999.633518
Bottom: 4428081.633518

Lineage
FGDC lineage
Process step 1
Process description: Using MARS software 2 meter ESRI floatgrid (.flt) files are exported based on the tile scheme. The ESRI .flt files are converted to ESRI grids using the Arcinfo Float to Raster tool.
Source used: LIDAR
Process date: completed 20100602
Who did this process
Staci L. B. Parent
Department of Natural Resources
physical:

301 Centennial Mall South

Lincoln, NE 68509

402-471-2363 (voice)

Process step 2
Process description: Metadata imported.
Source used: C:\MetaMan\2m_3x3_DEMs.xml
Process date: 20100604 at time 09534600
Sources
Source 1: Ground Control (Ground_Control)
Media: disc
Contribution: GPS control network for LIDAR acquisition and processing.
Currentness of this source
Source 2: LIDAR (LIDAR)
Media: disc
Contribution: LIDAR points form the basis of the DEM.
Currentness of this source
Beginning date and time: 20090120 at time unknown
Ending date and time: 20090315 at time unknown

Spatial data quality
Horizontal positional accuracy

For the LAS, horizontal accuracy is verified in three tests. During boresighting, adjoining flightlines are view in profile and hard edged features are observed and if necessary the flightlines are adjusted for good relative horizontal and vertical fit. The second test for horizontal accuracy is by comparing raw contours from each flightline against adjoining flightlines at specific points. The final test is the vertical LIDAR control report.

Estimated accuracy: 6 meters RMSE
How this value was determined:

Horizontal accuracy of the LAS will meet or exceed 0.6m RMSE (Accuracyr = 1.04m at the 95% confidence level).

Vertical positional accuracy

Survey control points were used to validate the accuracy of the LIDAR surface model after automatic and hand filtering. This surface exceeds the NSSDA vertical accuracy specifications of .185 meters RMSE.

Estimated accuracy: 0.185 meters RMSE
How this value was determined:

Vertical elevation for LAS will meet or exceed 0.185m RMSE (Accuracyz = 0.36m at the 95% confidence level)

Spatial data description
Raster dataset information
Raster format: GRID
SDTS raster type: Grid Cell
Number of raster bands: 1
Raster properties
Origin location: Upper Left
Has pyramids: TRUE
Has colormap: FALSE
Data compression type: Default
Display type: matrix values
Cell information
Number of cells on x-axis: 7500
Number of cells on y-axis: 5959
Number of cells on z-axis: 1
Number of bits per cell: 32
Cell Size
X distance: 2.000000
Y distance: 2.000000

Attributes

Details for ESRI 2 meter grids
Description
ESRI 2 meter grids
Source: NDNR

Overview

ESRI grids made from the ground classified lidar points

Overview citation

ESRI grids made from the ground classified lidar points