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Open-File Report 03-120

Bathymetry and selected perspective views of 6 reef and coastal areas in Northern Lake Michigan.

Lidar Bathymetry Data
 

Home
Intro
Map Views
  Boulder Reef
  Gull Island Reef
  Little Traverse Bay
  Trout and High Island Reefs
  Hog Island Reef
  Dahlia Shoals
Data
  XYZ
  Grid
Posters

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

  1. Click on the links below to download the files to the desktop.
  2. Uncompress the files. The files are compressed with WinZip 8.0.
  3. 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

  1. Click on the links below to download the files to the desktop.
  2. 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".
  3. 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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Page Last Modified: Wednesday, April 02, 2014, 03:25:30 PM