This is collection level metadata for LAS and ASCII data files from the statewide Iowa Lidar Project. The Iowa Light Detection
and Ranging (LiDAR) Project collects location and elevation (X, Y, Z) data to a set standard for the entire state of Iowa.
LIDAR is defined as an airborne laser system, flown aboard rotary or fixed-wing aircraft, that is used to acquire x, y, and
z coordinates of terrain and terrain features that are both manmade and naturally occurring. LIDAR systems consist of a light-emitting
scanning laser, an airborne Global Positioning System (GPS) with attendant GPS base station(s), and an Inertial Measuring
Unit (IMU). The laser scanning system measures ranges from the scanning laser to terrain surfaces by measuring the time it
takes for the emitted light (LIDAR return) to reach the earth's surface and reflect back to the onboard LIDAR detector. The
airborne GPS system ascertains the in-flight three-dimensional position of the sensor, and the IMU delivers precise information
about the attitude of the sensor. The LIDAR system incorporates data from these three subsystems to produce a large cloud
of points on the land surface whose X, Y, and Z coordinates are known within the specified accuracy. This collection consists
of ASCII files of bare earth elevations and intensity (x,y,z,i) and, LAS (version 1.0 lidar data interchange standard) binary
files that include all 1st and last returns, intensity and bare earth classification.
Citation
Title Iowa LiDAR Mapping Project
publication Date
2007-01-01
presentationForm
FEMA-DCS-TERRAIN
cited responsible party
-
publisher
organisation Name
Iowa Lidar Consortium
Contact information
Address
, State of Iowa
cited responsible party
-
originator
organisation Name
Iowa LiDAR Consortium
cited responsible party
-
originator
organisation Name
Federal Emergency Management Agency
This digital, geographically referenced data set was developed by the Iowa Department of Natural Resources to carry out agency
responsibilities related to management, protection, and development of Iowa's natural resources.
Resource language:
eng; USA
Resource progress code:
completed
Resource Maintenance Information
maintenance or update frequency:
notPlanned
Constraints on resource usage:
Constraints
Use limitation statement:
All data available on this site are currently undergoing quality assurance testing by the U.S. Geological Survey (USGS). While
this testing is underway, this data are being provided as-is, with no guarantee of accuracy. If USGS testing indicates data
do not meet accuracy specs, those data will immediately be removed from this site. Until USGS certification is received, users
should verify data accuracies for themselves.
Constraints on resource usage:
Legal Constraints
use constraint:
otherRestrictions
Other constraints
Use Constraints: The development of the coverages in the NRGIS Library represents a major investment of staff time and effort.
As a professional responsibility, the Iowa DNR expects to receive proper credit when these GIS coverages are utilized. he
Department also expects that the original documentation will remain with any redistribution of these coverages.
Constraints on resource usage:
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Access Constraints: None
Spatial representation type code:
vector
Processing environment:
Native Dataset Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.3500
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude
-96.684901
eastBoundLongitude
-90.069432
northBoundLatitude
43.557019
southBoundLatitude
40.332776
Temporal Extent
2007-01-01
Credits:
The Iowa Lidar Consortium consists of the Iowa Department of Agriculture and Land Stewardship, Iowa Department of Natural
Resources, Iowa Department of Transportation, the USDA Natural Resources Conservation Service (NRCS), and the US Geological
Survey (USGS).
point of contact
-
pointOfContact
individual Name Chris Ensminger
organisation Name
Iowa Department of Natural Resources
source description
Source Contribution: Bare Earth LAS point files named according to Iowa Tile IndexSource Type DIGITAL
source citation
Title Terrain Bare_Earth
publication Date
2007-01-01
cited responsible party
-
originator
organisation Name
The Iowa LiDAR Project
Resource extent
Temporal Extent
2007-04-26
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy Report
evaluation Method Description
LiDAR data are currently undergoing quality assurance testing by the U.S. Geological Survey (USGS). While this testing is
underway, these data are being provided as-is, with no guarantee of accuracy. If USGS testing indicates data do not meet accuracy
specs, those data will immediately be removed from distribution. Until USGS certification is received, users should verify
data accuracies for themselves. Standard LiDAR Specifications: -Sanborn prepares flight plans as parallel flight lines with
at least one cross flight line to assure positional accuracy and quality control. -Sanborn uses only automated filtering for
Standard LiDAR products with the following minimum performance for bare earth elevation models: -89% of artifacts or more
removed depending on terrain and vegetation -90% of all outliers removed -90% of all vegetation removed -93% of all buildings
removed -1.4 meter average point spacing -Scan frequency and angles based on project area terrain and landcover -1 meter RMSE
-No independent field verification FEMA Compliant LiDAR Specifications: -Sanborn flight plans are parallel flight lines with
at least one cross flight line to assure positional accuracy and quality control, and collection verified with both kinematic
and static collections. -Sanborn uses automated and manual filtering for LiDAR products with the following minimum performance
for bare earth elevation models: -90% of artifacts or more removed depending on terrain and vegetation -95% or better of all
outliers removed -95% of all vegetation removed -98% of all buildings removed In addition to Standard LiDAR specifications:
-Sanborn field verification -3 classes, 20 pts. each
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy Report
evaluation Method Description
UNI
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy
measure Description
The vertical accuracy will meet the requirements of NSSDA at the 95% confidence interval (1.96 x RMSE).
Quantitative Result
result value 18
value Units
Completeness Commission
evaluation Method Description
Data will continue to be collected until a complete set is obtained. See the Cross-referece citations for files that track
the completeness of the project.
Completeness Omission
evaluation Method Description
Data will continue to be collected until a complete set is obtained. See the Cross-referece citations for files that track
the completeness of the project.
notes: This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version
FGDC-STD-001-1998) using the 2012-06-20T17:21:00 version of the FGDC RSE to ISO 19115-2 transform.
Metadata Constraints
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Metadata Access Constraints: None
Metadata Constraints
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Metadata Use Constraints: None
Metadata contact
-
pointOfContact
individual Name GIS Librarian
organisation Name
Iowa Geological Survey, DNR
Contact information
Telephone
Voice 319-335-1575
Address
109 Trowbridge Hall, Iowa City, IA, 52242-1319
Country USA