2012 MN DNR Lidar: Central Lakes, MN
OCM Partners
Data Set
(DS)
| ID: 68691
| Published / External
Created: 2022-12-07
|
Last Modified: 2023-10-17
Project (PRJ) | ID: 49401
ID: 68691
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | 2012 MN DNR Lidar: Central Lakes, MN |
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Short Name | mn2012_cntrl_lakes_m9676_metadata |
* Status | Completed |
Creation Date | 2012 |
Revision Date | |
• Publication Date | 2013 |
* » Abstract |
The project vendor, Woolpert, Inc., acquired highly accurate Light Detection and Ranging (lidar) elevation data for the Central Lakes area of Minnesota in Spring 2012. The data cover Aitkin, Cass, Hubbard, Itasca, Todd and Wadena counties, along with a portion of Koochiching County. Lidar data are in the UTM Zone 15 coordinate system, NAD83 96, NAVD88 Geoid09, meters. The tiling scheme is 16th USGS 1:24,000 quadrangle tiles. The vendor delivered the data to the Minnesota Department of Natural Resources (DNR) in several formats: 1) One-meter digital elevation model 2) Edge-of-water breaklines 3) Classified LAS formatted point cloud data DNR then quality checked the data and created two additional products: two-foot contours and building outlines. The original metadata record was created at the Minnesota Geospatial Information Office using information supplied by Woolpert and DNR. This metadata supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the Entwine Point Tiles (EPT) hosted by USGS on Amazon Web Services. |
* Purpose |
The Minnesota Elevation Mapping Project was initiated to support the development of high accuracy land surface information for the purposes of improving water quality, flood emergency preparedness and response, floodplain mapping, transportation planning and design, recreational planning and design, urban planning and to provide more efficient and effective project planning and execution. This project was primarily funded by the Clean Water Fund of the Clean Water, Land and Legacy Amendment. For more about the Project, see: https://www.mngeo.state.mn.us/committee/elevation/mn_elev_mapping.html |
Notes | |
Other Citation Details | |
• Supplemental Information |
Central Lakes region, Minnesota |
DOI (Digital Object Identifier) | |
DOI Registration Authority | |
DOI Issue Date |
Keywords
Theme Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Science Keywords | EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION |
ISO 19115 Topic Category | elevation |
Temporal Keywords
Thesaurus | Keyword |
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* Spatial Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Location Keywords | CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA |
Global Change Master Directory (GCMD) Location Keywords | CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MINNESOTA |
Global Change Master Directory (GCMD) Location Keywords | VERTICAL LOCATION > LAND SURFACE |
Stratum Keywords
Thesaurus | Keyword |
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Instrument Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Instrument Keywords | LIDAR > Light Detection and Ranging |
Platform Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Platform Keywords | Airplane > Airplane |
Physical Location
• » Organization | Office for Coastal Management |
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• » City | Charleston |
• » State/Province | SC |
• Country | |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | Elevation |
• Maintenance Frequency | Unknown |
Maintenance Note | |
» Data Presentation Form | Model (digital) |
• Entity Attribute Overview | |
Entity Attribute Detail Citation | |
Entity Attribute Detail URL | |
Distribution Liability |
1. Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user's sole risk. 2. The Minnesota Department of Natural Resources General Geographic Data License Agreement is online: https://www.dnr.state.mn.us/sitetools/data_software_license.html 3. MnGeo's data disclaimer: https://www.mngeo.state.mn.us/chouse/disclaimer.html Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners |
Data Set Credit | Minnesota Department of Natural Resources and Woolpert, Inc. |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2022 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Distributor |
---|---|
* » Date Effective From | 2022 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Distributor |
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* » Date Effective From | 2012 |
Date Effective To | |
Organization | U.S. Geological Survey |
Address |
12201 Sunrise Valley Drive Reston, VA 20191 USA |
Email Address | |
Phone | |
Fax | |
Mobile | |
URL | https://usgs.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2022 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Point of Contact |
---|---|
* » Date Effective From | 2022 |
Date Effective To | |
Organization | NOAA Office for Coastal Management (NOAA/OCM) |
Address |
2234 South Hobson Ave Charleston, SC 29405-2413 |
Email Address | coastal.info@noaa.gov |
Phone | (843) 740-1202 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | |
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* » Date Effective From | |
Date Effective To | |
* » Contact | |
* Contact Instructions |
* » Support Role | |
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* » Date Effective From | |
Date Effective To | |
* » Contact | |
* Contact Instructions |
* » Support Role | |
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* » Date Effective From | |
Date Effective To | |
* » Contact | |
* Contact Instructions |
Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -95.312416 |
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* » E° Bound | -93.000201 |
* » N° Bound | 48.687949 |
* » S° Bound | 45.709332 |
* » Description |
Extent Group 1 / Vertical Extent
EPSG Code | |
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Vertical Minimum | |
Vertical Maximum |
Extent Group 1 / Time Frame 1
* » Time Frame Type | Range |
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* » Start | 2012-04-10 |
End | 2012-04-12 |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Extent Group 1 / Time Frame 2
* » Time Frame Type | Discrete |
---|---|
* » Start | 2012-04-14 |
End | |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Extent Group 1 / Time Frame 3
* » Time Frame Type | Range |
---|---|
* » Start | 2012-04-19 |
End | 2012-04-20 |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Extent Group 1 / Time Frame 4
* » Time Frame Type | Range |
---|---|
* » Start | 2012-04-23 |
End | 2012-04-24 |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Extent Group 1 / Time Frame 5
* » Time Frame Type | Range |
---|---|
* » Start | 2012-04-05 |
End | 2012-04-06 |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Extent Group 1 / Time Frame 6
* » Time Frame Type | Range |
---|---|
* » Start | 2012-04-26 |
End | 2012-04-28 |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Spatial Information
Spatial Resolution
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Equivalent Scale Denominator | |
Level of Detail Description |
Spatial Representation
Grid Representation Used? | |
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Vector Representation Used? | Yes |
Text / Table Representation Used? | |
TIN Representation Used? | |
Stereo Model Representation Used? | |
Video Representation Used? |
Grid Representation
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Vector Representation
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Point Object Present? | |
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Surface Object Count |
Reference Systems
Reference System
EPSG Code | EPSG:3857 | ||||||||||||||||||||||||||||
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Reference System
EPSG Code | EPSG:5703 | ||||||||||||||||||||||||||||
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Access Information
Data License | |
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Data License URL | |
Data License Statement | |
* » Security Class | Unclassified |
* Security Classification System | |
Security Handling Description | |
• Data Access Policy | |
» Data Access Procedure |
Data is available online for bulk and custom downloads. |
• » Data Access Constraints |
None |
• Data 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. |
Metadata Access Constraints | |
Metadata Use Constraints |
Distribution Information
Start Date | 2022-12-07 |
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End Date | Present |
» Download URL | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9676/details/9676 |
Distributor | NOAA Office for Coastal Management (NOAA/OCM) (2022 - Present) |
File Name | Customized Download |
Description |
Create custom data files by choosing data area, product type, map projection, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base. Change to an orthometric vertical datum is one of the many options. |
File Date/Time | |
File Type (Deprecated) | Zip |
Distribution Format | |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | 2022-12-07 |
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End Date | Present |
» Download URL | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_MN_CentralLakes_Block1_2012_LAS_2016/ |
Distributor | U.S. Geological Survey (2012 - Present) |
File Name | Bulk Download - Block 1 |
Description |
Bulk download of the Block 1 data files in LAZ format, based on a horizontal datum/projection of UTM Zone 15, NAD83, meters and a vertical datum of NAVD88 (GEOID09) and units in meters. This url links to the USGS copy of the files, from which the Entwine Point Tile files originated. These have not been reviewed by OCM and the link is provided here for convenience. |
File Date/Time | |
File Type (Deprecated) | LAZ |
Distribution Format | LAS/LAZ - LASer |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | 2022-12-07 |
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End Date | Present |
» Download URL | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_MN_CentralLakes_Block2_2012_LAS_2016/ |
Distributor | U.S. Geological Survey (2012 - Present) |
File Name | Bulk Download - Block 2 |
Description |
Bulk download of the Block 2 data files in LAZ format, based on a horizontal datum/projection of UTM Zone 15, NAD83, meters and a vertical datum of NAVD88 (GEOID09) and units in meters. This url links to the USGS copy of the files, from which the Entwine Point Tile files originated. These have not been reviewed by OCM and the link is provided here for convenience. |
File Date/Time | |
File Type (Deprecated) | LAZ |
Distribution Format | LAS/LAZ - LASer |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | 2022-12-07 |
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End Date | Present |
» Download URL | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_MN_CentralLakes_Block3_2012_LAS_2016/ |
Distributor | U.S. Geological Survey (2012 - Present) |
File Name | Bulk Download - Block 3 |
Description |
Bulk download of the Block 3 data files in LAZ format, based on a horizontal datum/projection of UTM Zone 15, NAD83, meters and a vertical datum of NAVD88 (GEOID09) and units in meters. This url links to the USGS copy of the files, from which the Entwine Point Tile files originated. These have not been reviewed by OCM and the link is provided here for convenience. |
File Date/Time | |
File Type (Deprecated) | LAZ |
Distribution Format | LAS/LAZ - LASer |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | 2022-12-07 |
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End Date | Present |
» Download URL | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_MN_CentralLakes_Block4_2012_LAS_2016/ |
Distributor | U.S. Geological Survey (2012 - Present) |
File Name | Bulk Download - Block 4 |
Description |
Bulk download of the Block 4 data files in LAZ format, based on a horizontal datum/projection of UTM Zone 15, NAD83, meters and a vertical datum of NAVD88 (GEOID09) and units in meters. This url links to the USGS copy of the files, from which the Entwine Point Tile files originated. These have not been reviewed by OCM and the link is provided here for convenience. |
File Date/Time | |
File Type (Deprecated) | LAZ |
Distribution Format | LAS/LAZ - LASer |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | 2022-12-07 |
---|---|
End Date | Present |
» Download URL | https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_MN_CentralLakes_Block5_2012_LAS_2016/ |
Distributor | U.S. Geological Survey (2012 - Present) |
File Name | Bulk Download - Block 5 |
Description |
Bulk download of the Block 5 data files in LAZ format, based on a horizontal datum/projection of UTM Zone 15, NAD83, meters and a vertical datum of NAVD88 (GEOID09) and units in meters. This url links to the USGS copy of the files, from which the Entwine Point Tile files originated. These have not been reviewed by OCM and the link is provided here for convenience. |
File Date/Time | |
File Type (Deprecated) | LAZ |
Distribution Format | LAS/LAZ - LASer |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
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End Date | |
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Archive Information
Location | |
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File Identifier | |
File Name | |
URL | |
Description | |
DOI | |
Archive Date | |
Archive Update Frequency |
Location | |
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URL | |
Description | |
DOI | |
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URLs
URL | https://coast.noaa.gov/dataviewer/ |
---|---|
Name | NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV) |
URL Type | Online Resource |
File Resource Format | HTML |
Description |
The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer. |
URL | https://usgs.entwine.io/data/view.html?r=%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block1_2012_LAS_2016%22 |
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Name | USGS 3D Potree View - Block/Delivery 1 |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to view the Block/Delivery 1 point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. |
URL | https://usgs.entwine.io/data/view.html?r=%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block2_2012_LAS_2016%22 |
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Name | USGS 3D Potree View - Block/Delivery 2 |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to view the Block/Delivery 2 point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. |
URL | https://usgs.entwine.io/data/view.html?r=%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block3_2012_LAS_2016%22 |
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Name | USGS 3D Potree View - Block/Delivery 3 |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to view the Block/Delivery 3 point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. |
URL | https://usgs.entwine.io/data/view.html?r=%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block4_2012_LAS_2016%22 |
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Name | USGS 3D Potree View - Block/Delivery 4 |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to view the Block/Delivery 4 point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. |
URL | https://usgs.entwine.io/data/view.html?r=%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block5_2012_LAS_2016%22 |
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Name | USGS 3D Potree View - Block/Delivery 5 |
URL Type | Online Resource |
File Resource Format | |
Description |
Link to view the Block/Delivery 4 point cloud (using the Entwine Point Tile (EPT) format) in the 3D Potree viewer. |
URL | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block1_2012_LAS_2016/ept.json |
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Name | USGS Entwine Point Tiles (EPT) - Block/Delivery 1 |
URL Type | Online Resource |
File Resource Format | json |
Description |
Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud. |
URL | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block2_2012_LAS_2016/ept.json |
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Name | USGS Entwine Point Tiles (EPT) - Block/Delivery 2 |
URL Type | Online Resource |
File Resource Format | json |
Description |
Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud. |
URL | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block3_2012_LAS_2016/ept.json |
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Name | USGS Entwine Point Tiles (EPT) - Block/Delivery 3 |
URL Type | Online Resource |
File Resource Format | json |
Description |
Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud. |
URL | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block4_2012_LAS_2016/ept.json |
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Name | USGS Entwine Point Tiles (EPT) - Block/Delivery 4 |
URL Type | Online Resource |
File Resource Format | json |
Description |
Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud. |
URL | https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_Block5_2012_LAS_2016/ept.json |
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Name | USGS Entwine Point Tiles (EPT) - Block/Delivery 5 |
URL Type | Online Resource |
File Resource Format | json |
Description |
Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud. |
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Accuracy | |
Analytical Accuracy | |
Horizontal Positional Accuracy |
Compiled to meet +/- 3.8 ft horizontal accuracy at 95 percent confidence level. |
Vertical Positional Accuracy |
1. Woolpert: The lidar data vertical accuracy RMSE is 5.0 cm (0.16 ft). The data collected under this Task Order meets the National Standard for Spatial Database Accuracy (NSSDA) accuracy standards. The NSSDA standards specify that vertical accuracy be reported at the 95 percent confidence level for data tested by an independent source of higher accuracy: https://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/index_html Tested 9.8cm (0.31ft) fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (RMSE) x 1.96000 Tested against the TIN using independent check points. 2. Report from DNR: The lidar collected for this task order was tested using independent, locally provided validation points. The vertical accuracy (Z-RMSE): Block 1: 15.4 cm. Block 2: 13.7 cm. Block 3: 12.0 cm. Block 4: 18.6 cm. Block 5: 11.1 cm. See detailed reports in each block folder, for example, for Block 1: https://resources.gisdata.mn.gov/pub/data/elevation/lidar/projects/central_lakes/block_1/Central_Lakes_block_1_validation_report.pdf |
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Completeness Report |
The lidar data is visually inspected for completeness to ensure that are no gaps between flight lines. |
Conceptual Consistency |
All formatted data are validated using commercial GIS software to ensure proper formatting and loading prior to delivery. |
» Quality Control Procedures Employed |
Data Management
» Have Resources for Management of these Data Been Identified? | Yes |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | Unknown |
» Do these Data Comply with the Data Access Directive? | Yes |
» Is Access to the Data Limited Based on an Approved Waiver? | |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» Actual or Planned Long-Term Data Archive Location | NCEI-CO |
» Approximate Delay Between Data Collection and Archiving | |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
Data is backed up to tape and to cloud storage. |
Lineage
» Lineage Statement |
The Central Lakes, MN lidar was ingested into the Data Access Viewer for custom product generation by leveraging USGS hosted Entwine Point Tiles. |
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Sources
Citation Title | Entwine Point Tiles on AWS |
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Contact Role Type | Originator |
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Contact Name | USGS |
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Citation URL | https://usgs.entwine.io/ |
Citation URL Name | USGS Entwine Point Cloud |
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Process Steps
Process Step Number | 1 |
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» Description |
Vendor Processing Steps: Using Light Detection And Ranging (lidar) systems, 442 flight lines of high density data, at a nominal pulse spacing (NPS) of 1.5 meter, were collected over Minnesota counties of Aitkin, Cass, Hubbard, Itasca, Todd, Wadena and a portion of Koochiching (approximately 11,690 sq. miles), along with a 100 meter buffer beyond the project tile boundary. Multiple returns were recorded for each laser pulse along with an intensity value for each return. A total of thirty one (31) missions were flown from April 05, 2012 through April 28, 2012. A minimum of six (6) airborne global positioning system (GPS) base stations were used in support of the lidar data acquisition. All data for this task order is referenced to UTM 15N, NAD83, NAVD88, in meters. 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 reflective surface for each flight line. The coverage was classified to extract a bare earth digital elevation model (DEM) and separate last returns. In addition to the LAS deliverables, one layer of coverage was delivered in the ArcGrid binary format: bare-earth. System Parameters for 1.5 NPs: ALS60 Specifications Post Spacing (Minimum): 4.92 ft / 1.5 m AGL (Above Ground Level) average flying height: 7,800 ft / 2,377.4 m MSL (Mean Sea Level) average flying height: 9,000 ft / 2712.7 m Average Ground Speed: 150 knots / 172.6 mph Field of View (full): 40 degrees Pulse Rate: 99 kHz Scan Rate: 38 Hz Side Lap (Minimum): 25% ALS70 Specifications Post Spacing (Minimum): 4.92 ft / 1.5 m AGL (Above Ground Level) average flying height: 7,800 ft / 2,377.4 m MSL (Mean Sea Level) average flying height: 9,075 ft / 2766 m Average Ground Speed: 150 knots / 172.6 mph Field of View (full): 40 degrees Pulse Rate: 115.3 kHz Scan Rate: 25.1 Hz Side Lap (Minimum): 25% Optech ALTM Gemini Specifications Post Spacing (Minimum): 4.92 ft / 1.5 m AGL (Above Ground Level) average flying height: 6,800 ft / 2,072.6 m MSL (Mean Sea Level) average flying height: 9,000 ft / 2712.7 m Average Ground Speed: 150 knots / 172.6 mph Field of View (full): 40 degrees Pulse Rate: 99.1 kHz Scan Rate: 38 Hz Side Lap (Minimum): 25% The ALS60, ALS70 and Optech Gemini calibration and system performance is verified on a periodic basis using Woolpert's calibration range. The calibration range consists of a large building and runway. The edges of the building and control points along the runway have been located using conventional survey methods. Inertial measurement unit (IMU) misalignment angles and horizontal accuracy are calculated by comparing the position of the building edges between opposing flight lines. The scanner scale factor and vertical accuracy is calculated through comparison of lidar data against control points along the runway. Field calibration is performed on all flight lines to refine the IMU misalignment angles. IMU misalignment angles are calculated from the relative displacement of features within the overlap region of adjacent (and opposing) flight lines. The raw lidar data is reduced using the refined misalignment angles. Once the data acquisition and GPS processing phases are complete, the lidar data was processed immediately to verify the coverage had no voids. The GPS and IMU data was post processed using differential and Kalman filter algorithms to derive a best estimate of trajectory. The quality of the solution was verified to be consistent with the accuracy requirements of the project. |
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Process Step Number | 2 |
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» Description |
The individual flight lines were inspected to ensure the systematic and residual errors have been identified and removed. Then, the flight lines were compared to adjacent flight lines for any mismatches to obtain a homogenous coverage throughout the project area. The point cloud underwent a classification process to determine bare-earth points and non-ground points utilizing "first and only" as well as "last of many" LiDAR returns. This process determined The LiDAR LAS files for this task order have been classified into the Default (Class 1), Ground (Class 2), Low Vegetation (Class 3 (less than 1.1 m)), Medium Vegetation (Class 4 (1.11 - 2.4 m)), High Vegetation (Class 5 (2.41 - 200 m)) Buildings (Class 6), Noise (Class 7), Model Keypoints (Class 8), Water (Class 9), Ignored Ground (Class 10), bridges (Class 14), and Overlap (Class 17) classifications. The bare-earth (Class 2 - Ground) LiDAR points underwent a manual QA/QC step to verify that artifacts have been removed from the bare-earth surface. The surveyed ground control points are used to perform the accuracy checks and statistical analysis of the LiDAR dataset. |
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Process Step Number | 3 |
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» Description |
Additional Products Generated by Minnesota DNR staff: These products are in the geodatabase for each of the tiles: 1. Two-foot contours were created by resampling the 1-meter DEM to 3 meters, then smoothing the 3-meter grid using a neighborhood average routine, and then creating contours from this surface using standard ArcGIS processing tools. 2. Building outlines were created by extracting from the LAS files those points with Classification 6 (buildings), then grouping those points within 3 meters of each other into a single cluster and then creating an outline around those points. This was done using standard ArcMap tools. 3. Hillshades were created from the one- and three-meter DEMs using standard ArcMap tools. Azimuth value = 215, Altitude = 45, Z-Factor = 1 |
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Process Step Number | 4 |
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» Description |
Original point clouds in LAS/LAZ format were restructured as Entwine Point Tiles and stored on Amazon Web Services. The data were reprojected horizontally to WGS84 web mercator (EPSG 3857) and no changes were made to the vertical (NAVD88 GEOID09 meters). |
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Process Contact | U.S. Geological Survey |
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Process Step Number | 5 |
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» Description |
The NOAA Office for Coastal Management (OCM) created references to the Entwine Point Tiles (EPT) that were ingested into the NOAA Digital Coast Data Access Viewer (DAV). No changes were made to the data. The DAV will access the point cloud as it resides on Amazon Web Services (AWS) under the usgs-lidar-public container. These are the AWS URLs being accessed: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_B1_2012_LAS_2016/ept.json https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_B2_2012_LAS_2016/ept.json https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_B3_2012_LAS_2016/ept.json https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_B4_2012_LAS_2016/ept.json https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MN_CentralLakes_B5_2012_LAS_2016/ept.json |
Process Date/Time | 2022-12-05 00:00:00 |
Process Contact | Office for Coastal Management (OCM) |
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Acquisition Information
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Child Items
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Catalog Details
Catalog Item ID | 68691 |
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Metadata Record Created By | Rebecca Mataosky |
Metadata Record Created | 2022-12-07 19:04+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2023-10-17 16:12+0000 |
Metadata Record Published | 2022-12-08 |
Owner Org | OCMP |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2022-12-08 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2023-12-08 |
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