LiDAR Elevation, Stearns County, Minnesota, 2006

This page last updated: 04/29/2014
Metadata created using Minnesota Geographic Metadata Guidelines


Go to Section:
1. Overview
2. Data Quality
3. Data Organization
4. Coordinate System
5. Attributes
6. Distribution - Get Data
7. Metadata Reference

Section 1 Overview
Originator Stearns County, Minnesota
Title LiDAR Elevation, Stearns County, Minnesota, 2006
Abstract The LiDAR data for Stearns County was collected under contract by the county. Thus, the data format is not entirely consistent with some of the other LiDAR data collected by the State of Minnesota. Specifically, the Stearns County collect required classification of only Bare Earth returns in the LiDAR LAS files, so there is no information on buildings, vegetation, or model key points.

Breaklines captured as part of this effort are also a bit different. In Stearns County, the breaklines are 3D Polyline features rather than 3D Polygon features. They also include road centerlines, stream courses and other features that are not part of the Statewide collect specifications.

The following data was delivered to the Minnesota Department of Natural Resources (DNR):

1. Bare Earth LAS files
2. 1-foot DEMs
3. Breaklines (edge of water, curb and centerlines)

DNR staff created the two-foot contours.

Note: This metadata record was created at the Minnesota Geospatial Information Office using information supplied by DNR.
Purpose
Time Period of Content Date 2006
Currentness Reference
Progress Complete
Maintenance and Update Frequency Unknown
Spatial Extent of Data Stearns County, Minnesota
Bounding Coordinates -95.13
-94.05
45.79
45.27
Place Keywords Minnesota, MN, Stearns County
Theme Keywords elevation, LiDAR, DEM, digital elevation model, contour, topographic, topo, DTM, LAS, breakline
Theme Keyword Thesaurus ISO 19115
Access Constraints None.
Use Constraints This data was purchased from Stearns County by the State of Minnesota to put it into the public domain. This data can be shared and distributed free of charge.

See Disclaimer field for complete use conditions.
Contact Person Information Tim Loesch, GIS Section Manager
Minnesota Department of Natural Resources
500 Lafayette Rd
St. Paul, MN  551554011
Phone: 651-259-5475
Email: tim.loesch@state.mn.us
Browse Graphic None available
Associated Data Sets For more information about elevation data for Minnesota, see: www.mngeo.state.mn.us/chouse/elevation/index.html

Section 2 Data Quality
Attribute Accuracy
Logical Consistency
Completeness
Horizontal Positional Accuracy
Lineage The data was delivered to the DNR in 2K by 2K tiles that were referenced to the Stearns County coordinate system. This included:

Bare Earth LAS files
1-foot DEMs
Breaklines (edge of water, curb and centerlines)

LAS file processing:
Projected from Stearns county coordinates to UTM Zone 15.
Reformatted into 1/16 USGS 1:24,000-scale tiles.

Breakline Processing:
Breaklines were imported from DXF files into a single, merged dataset.
Breaklines were then projected from Stearns county coordinates to UTM Zone 15, NAD83 Datum.
Breakline Z Values were then scaled from feet to meters.

Terrain Processing:
An ESRI Terrain Dataset was then created using the Bare Earth Points from the projected LAS files and the projected and scaled breaklines.

DEM Generation:
New DEMs were generated rather than projecting the existing DEMs because the DEM is already an interpolated product and projecting this data would result in additional interpolation. Projecting the discrete point data and recreating the DEMs using the breaklines to enforce hydro-flattening was done.

- DEM01 - was created from the Terrain dataset. Cellsize 1 and nearest neighbor options were used in the ArcGIS command and the extent was snapped to an integer meter grid.
- DEM01HS - Hillshade was created from DEM01 - Altitude 45, Azimuth 215.
- DEM03 - was created from the Terrain dataset. Cellsize 3 and nearest neighbor options were used in the ArcGIS command and the extent was snapped to the state 3-meter grid for consistency with other products.
- DEM03HS - Hillshade was created from DEM03 - Altitude 45, Azimuth 215.
- DEM03_aspect - Land Surface aspect was generated from DEM03.
- DEM03slope_degrees - Land Surface slope in degrees was generated from DEM03.
- DEM03slope_percent - land surface slope in percent was generated from DEM03.

DEM Processing:
DEMs were merged into a single county raster.
Raster was then projected to UTM Zone 15, NAD 83 Datum with a cell size of 1-meter using a bilinear interpolation (DEM01).
One-meter raster was then generalized to 3-meter cell size (DEM03).
Three-meter DEM was smoothed using a 3x3 mean filter to facilitate contouring.
2-foot contours were created from the smoothed 3-meter raster - the smoothed raster was deleted when complete.


Processing Summary:

1) LAS files were projected from county coordinates to UTM Zone 15, NAD83
2) LAS point Z values were scaled from feet to meters
3) LAS files were retiled into the state tile scheme (1/16 of a USGS 1:24,000 scale quadrangle)
4) Breakline features were merged together into a single feature class
5) Breakline features were projected from county coordinates to UTM Zone 15, NAD83
6) Breakline Z Values were scaled from feet to meters
7) LAS Bare Earth Points and breaklines were used to create a Terrain data type
8) 1-meter DEM was derived from Terrain using nearest neighbor interpolation option (DEM01)
9) Hillshade was derived from 1-meter DEM Altitude 45, Azimuth 215 (DEM01HS)
10) 3-meter DEM was derived from Terrain using nearest neighbor interpolation option (DEM03)
11) Hillshade was derived from 3-meter DEM Altitude 45, Azimuth 215 (DEM03HS)
12) Aspect was derived from 3-meter DEM (DEM03ASPECT)
13) Slope in degrees was derived from 3-meter DEM (DEM03SLOPE_DEGREES)
14) Slope in percent was derived from 3-meter DEM (DEM03SLOPE_PERCENT)
15) DEM03 was smoothed using a 3x3 mean smoothing filter
16) 2-foot contours were created from the smoothed 3-meter DEM

All DEMS are hydro-flattened and enforced using the breakline features.

All processing was done using ESRI ArcGIS V10 software and LP360 Extensions software by QCoherent.

Section 3 Spatial Data Organization (not used in this metadata)

Section 4 Coordinate System
Horizontal Coordinate Scheme Universal Transverse Mercator
UTM Zone Number 15
Horizontal Datum NAD83
Horizontal Units meters

Section 5 Attributes
Overview
Detailed Citation
Table Detail:

Section 6 Distribution
Publisher Minnesota Department of Natural Resources
Publication Date
Contact Person Information Nancy Rader, GIS Data Coordinator
Minnesota Geospatial Information Office (MnGeo)
658 Cedar Street, Room 300
St. Paul, MN  55155
Phone: 651-201-2489
Fax: 651-296-6398
Email: gisinfo.mngeo@state.mn.us
Distributor's Data Set Identifier Stearns LiDAR 2006
Distribution Liability 1. Minnesota Department of Natural Resources General Geographic Data License Agreement is online: www.dnr.state.mn.us/sitetools/data_software_license.html

2. MnGeo's data disclaimer is online: www.mngeo.state.mn.us/chouse/disclaimer.html
Ordering Instructions The LiDAR data provided by DNR may be viewed online or downloaded in several ways:

1. MnTOPO website: www.dnr.state.mn.us/maps/mntopo/index.html

- view data online
- download data in Esri and open formats (tiles for most data formats will be mosaicked together during download)
- see the help file for details: files.dnr.state.mn.us/aboutdnr/gis/mntopo/mntopo_help_document.pdf


2. MnGeo's FTP site
Use the tile_index.pdf maps to locate the tiles you need. Except for the county file, tiles will not be mosaicked.

a. From the county folder: ftp.lmic.state.mn.us/pub/data/elevation/lidar/county/stearns/
The county mosaic is named elevation_data.gdb.zip For details of its contents and size, see this table: geoint.lmic.state.mn.us/lidar.php

b. In the 250k tiles folder: ftp.lmic.state.mn.us/pub/data/elevation/lidar/q250k/


For more help with Minnesota's LiDAR data, see www.mngeo.state.mn.us/chouse/elevation/lidar.html
Online Linkage I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process or link to download information. See "Ordering Instructions" above for details.

Section 7 Metadata Reference
Metadata Date 04/29/2014
Contact Person Information Nancy Rader, GIS Data Coordinator
Minnesota Geospatial Information Office (MnGeo)
658 Cedar Street, Room 300
St. Paul, MN  55155
Phone: 651-201-2489
Fax: 651-296-6398
Email: gisinfo.mngeo@state.mn.us
Metadata Standard Name Minnesota Geographic Metadata Guidelines
Metadata Standard Version 1.2
Metadata Standard Online Linkage http://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm


This page last updated: 04/29/2014
Go back to top