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This Open-File Report contains the bathymetry data from the 2001 Lidar survey of the Selected reefs in Northern Lake Michigan. The data are provided in two formats (XYZ and ArcInfo GRID) that can be used in a number of GIS and other software packages.
Data
XYZ format
The data are available in comma delimited XYZ (x-coordinate, y-coordinate, value) format.
Disclaimer: Downloading files from the Internet can sometimes be problematic. Different web browsers and operating systems act differently. The instructions above may vary from system to system or may not work at all.
Instructions
- Click on the links below to download the files to the desktop.
- Uncompress the files. The files are compressed with WinZip 8.0.
- The uncompression will result in a new comma delimited file (bathy.csv, mos.csv).
Boulder Reef
| Download Bathymetry |
Specs |
FGDC Compliant Metadata for ASCII XYZ format |
| boulder.zip |
value = depth: min = 148.000m,
max = 171.025 m
4-m spatial resolution
24 Mb compressed,
81 Mb uncompressed |
FAQ
HTML
TEXT |
Gull Island Reef
| Download Bathymetry |
Specs |
XYZ Metadata |
| gull.zip |
value = depth: min = -174.490m,
max = --149.065m
4-m spatial resolution
11 Mb compressed,
38 Mb uncompressed |
FAQ
HTML
TEXT |
Trout Island Reef
| Download Bathymetry |
Specs |
XYZ Metadata |
| trout.zip |
value = depth: min = -197.738m,
max = -149.065m
4-m spatial resolution
12 Mb compressed,
41 Mb uncompressed |
FAQ
HTML
TEXT |
High Island Reef
| Download Bathymetry |
Specs |
XYZ Metadata |
| high.zip |
value = depth: min = -209.799m,
max = -149.065m
4-m spatial resolution
9 Mb compressed,
31 Mb uncompressed |
FAQ
HTML
TEXT |
Hog Island Reef
| Download Bathymetry |
Specs |
XYZ Metadata |
| hog.zip |
value = depth: min = 144.080m,
max = 197.253m
4-m spatial resolution
15 Mb compressed,
50 Mb uncompressed |
FAQ
HTML
TEXT |
Dahlia Shoals
| Download Bathymetry |
Specs |
XYZ Metadata |
| dahlia.zip |
value = depth: min = -180.200m,
max = -146.200m
4-m spatial resolution
12 Mb compressed,
41 Mb uncompressed |
FAQ
HTML
TEXT |
Little Traverse Bay
| Download Bathymetry |
Specs |
XYZ Metadata |
| traverse.zip |
value = depth: min = -213.052m,
max = -147.570m
4-m spatial resolution
12 Mb compressed,
32 Mb uncompressed |
FAQ
HTML
TEXT |
Projection Information
Projection: Geographic
Units: Decimal Degrees
Zunits: Meters
Datum: WGS84
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ArcInfo GRID format
The data are also available in ArcInfo GRID format that can be used directly in ESRI ArcInfo, ArcView, or any other GIS or remote sensing software package that supports ESRI GRID format. In ArcView, the GRID files will be most useful with the Spatial Analyst Extension.
Disclaimer: Downloading files from the Internet can sometimes be problematic. Different web browsers and operating systems act differently. The instructions below may vary from system to system or may not work at all.
One known problem is sometimes Netscape Navigator automatically changes the .tgz suffix to .tar during the download. If this happens change the .tar suffix back to .tgz after the download. Double click on the icon and Winzip should start up.
Instructions
- Click on the links below to download the files to the desktop.
- Uncompress and unbundle the files. Since ESRI GRIDs are directories of files the directories have been bundled into a single file for downloading. Each bundled file is also compressed for faster downloading.
- Windows - Double click on each file. Winzip 8.0 will recognize the file is compressed and bundled.
- UNIX - Uncompress using "gunzip" then unbundle using "tar xf".
- The bathymetry and acoustic backscatter GRID files (i.e nbathyg and nmosg) are contained within each respective folder (nbathy and nmos).
Boulder Reef
| Download Bathymetry |
Specs |
FGDC Compliant Metadata for ArcInfo GRID format |
| bouldergrd.tgz |
value = depth: min = 148.000m,
max = 171.025 m
4-m spatial resolution
7.1 Mb compressed,
15.4 Mb uncompressed |
FAQ
HTML
TEXT |
Gull Island Reef
| Download Bathymetry |
Specs |
ArcInfo GRID metadata |
| gullgrd.tgz |
value = depth: min = -174.490m,
max = --149.065m
4-m spatial resolution
3.3 Mb compressed,
6.21 Mb uncompressed |
FAQ
HTML
TEXT |
Trout Island Reef
| Download Bathymetry |
Specs |
ArcInfo GRID metadata |
| troutgrd.tgz |
value = depth: min = -197.738m,
max = -149.065m
4-m spatial resolution
3.6 Mb compressed,
7.27 Mb uncompressed |
FAQ
HTML
TEXT |
High Island Reef
| Download Bathymetry |
Specs |
ArcInfo GRID metadata |
| highgrd.tgz |
value = depth: min = -209.799m ,
max = -149.065m
4-m spatial resolution
2.6 Mb compressed,
5.67 Mb uncompressed |
FAQ
HTML
TEXT |
Hog Island Reef
| Download Bathymetry |
Specs |
ArcInfo GRID metadata |
| hoggrd.tgz |
value = depth: min = 144.080m,
max = 197.253m
4-m spatial resolution
3.8 Mb compressed,
8.0Mb uncompressed |
FAQ
HTML
TEXT |
Dahlia Shoals
| Download Bathymetry |
Specs |
ArcInfo GRID metadata |
| Dahliagrd.tgz |
value = depth: min = -180.200m,
max = -146.200m
4-m spatial resolution
4.0 Mb compressed,
11.8 Mb uncompressed |
FAQ
HTML
TEXT |
Little Traverse Bay
| Download Bathymetry |
Specs |
ArcInfo GRID metadata |
| traversegrd.tgz |
value = depth: min = -213.052m,
max = -147.570m
4-m spatial resolution
3.1 Mb compressed,
13.7 Mb uncompressed |
FAQ
HTML
TEXT |
Projection Information
Projection: UTM
Zone: 16
Datum: WGS84
Units: Meters
Zunits: Meters
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U.S. Department of the Interior |
U.S. Geological Survey