The above map shows some of my completed island mapping projects. Each icon contains the name of the primary island associated with the project and a link to the post. Once all of my projects are posted, the map will be covered with icons. To productively use the map, zoom into a region of interest. Then select an icon.

Each of my maps is constructed of numerous layers of information. All of the layers are vector files. I will make these files available upon request. You are free to use them with certain restrictions - 1) Don't sell them. You can use them on research projects, post them to your website or things of that nature. If you aren't sure about the use of my maps, drop me a line and we can discuss your idea. 2) Give me credit when you use my vectors or images of my maps. Credit them to Peter Minton @ EVS-Islands

If I have the island vector file(s) and based upon your need, I will make them available. Images of my maps are yours to download and use, with the above restrictions applicable. Enjoy!

Saturday, July 07, 2007

Little Sitkin Island US - These are "WOW" Images

Little Sitkin - View North (ISS Image)

Little Sitkin Island - View North (ISS Image Mosaic)

Little Sitkin Island US - A GE Tour

I'm not a Google Earth (GE) mashup person. The only way I could think to share my work posted in Google Earth was using screen shots. I am making use of Flickr slideshow feature. It will give you an idea on how a brief tour in GE might be.

The two images that makeup my overlay are from two ISS005 Images (18288 & 18289). I patched them together to create this virtually cloud-free image of Little Sitkin. Cloud-free and the Aleutians is a weather anomoly. If you do get a clear day, the islands are often shrouded in snow. These images are exquisite for clarity of ground detail. The images gets their 3D effect from the underlying data (SRTM/DEM) in GE. The western shoreline has been stretched to accomodate the underlying SRTM/DEM data. Consequently, the lat/lon's for that shoreline are off by a few hundred meters. If you want to make a map, you will need to get in touch with me and I'll send you a GEOTIFF image of the island. With that you can make a map.

The photos were taken during a research trip in 2005. The photographer is unidentified. Images are courtesy of AVO/U.S. Geological Survey. Please cite the photographer and Alaska Volcano Observatory / U.S. Geological Survey when using these images.

Follow this link and you can take the tour in GE.

View Little Sitkin Island on Google Maps

Enjoy!

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Monday, July 02, 2007

Nikumaroro Atoll KR - Third Time is the Charm

Nikumaroro Atoll KR - Marplot Map (1-30,000)

Nikumaroro Atoll - Marplot Map (1:30,000)

This is my third time posting this. I received an e-mail from a representative of TIGHAR, a group that has visited this atoll searching for clues to the whereabouts of Amelia Earhart. He asked that I post the following information to discourage visits to the island. The only way one is allowed to visit is with permission of Kiribatian authorities. Read on.

"The best landing place, marked by a white pyramidal concrete structure, is about 0.3 mile S of the village. A boat channel has been cut through the reef in a 054˚ direction and in line with the concrete beacon. Landing should be attempted just after HW when there is less surf than on a rising tide. With a SE wind, landing can be effected in the lee of the wreck at any stage of the tide."

(Sailing Directions Pub-126)

Comment from Pat Thrasher at TIGHAR: The beacon is long gone. It was cleaned off by a storm in 1990 or so. The wreck is gone except for the shell of the triple expansion steam engine. No lee.

BUT. It is completely, utterly ILLEGAL for anyone to land there at all. It is a protected area, bird sanctuary, and about to become a World Heritage Site. No fishing, no landing, no nothing, except as sanctioned by the government of the Republic of Kiribati. We have permission and will have a Customs officer with us. No equipment may be landed without strict adherence to environmental concerns about introduction of insects, bacteria, molds, etc.

Nikumaroro is a sensitive archeological and cultural site. I hope you will discourage landings rather than promoting them with information about when and where to make them!

Nikumaroro Atoll KR

Nikumaroro Atoll (Gardner Island) (4˚40'S., 174˚31'W.) is a wooded, wedge-shaped atoll lying about 137 miles W of Orona Atoll (Hull Island). The atoll is surrounded by a fringing reef, which dries at LW, extending about 0.2 mile offshore. The NW and SE extremities of the reef appears to be extending. Depths off the atoll, which is steep-to except at its NW and SE extremities, average 366m, 0.3 mile from the reef. Nikumaroro Atoll (Gardner Island) encloses a lagoon into which there is no navigable passage. With the exception of two breaks, a large one on the W side and a narrow one on the S side, the land rim of the atoll entirely surrounds the lagoon.

The lagoon is encumbered with coral heads, but seaplanes have landed successfully.

A conspicuous stranded wreck lies close W of the N extremity of the atoll. The wreck was reportedly breaking up.

Tides—Currents.—Off the atoll the set is W, and varies in direction and strength with the prevailing wind. Close inshore, the current follows the trend of the land to the W. There is a deserted village on the W side of the atoll, about 1 mile S of the N extremity, off which anchorage may be obtained by small vessels, very close inshore. Two small beacons N of the village indicate the approach.

Directions.—The best landing place, marked by a white pyramidal concrete structure, is about 0.3 mile S of the village. A boat channel has been cut through the reef in a 054˚ direction and in line with the concrete beacon. Landing should be attempted just after HW when there is less surf than on a rising tide. With a SE wind, landing can be effected in the lee of the wreck at any stage of the tide. The reef is extremely slippery and wide, and the landing is not recommended if any equipment is to be landed or brought off. (SD Pub-126)


This is a redo of a previous post dated 2/25/2006. I wanted to bring in my current colors and include the standard images and maps (1:200,000, 1:100,000, 1:50,000 and 1:25,000). In addition, I wanted to show the Ikonos image that was used to help in digitizing the vectors that makeup this map.

If you have difficulties reading the Flash presentation, go directly to my Flickr account and check out the set of images with the same name as the title of this post.

Enjoy!

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Nice treatment of Nikumaroro, but visitors (if any) should know that the pyramidal concrete channel marker you mention was destroyed in a storm in about 1990. This of course makes it a good deal trickier to find one's way in through the channel cut in the reef flat.

By Anonymous Tom King, at 12/19/2006 01:59:00 PM  

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Comparison - EVS-R and WVS

World Vector Shorelines (WVS) is the default shoreline for most government produced maps. It is also used extensively by many in the commercial mapping arena to produce their products. It is an excellent vector map file that shows shorelines of the world in exquisite detail.

That said, I searched for a detailed map of the Tokelau Islands at a large enough scale that all three of the atolls (Atafu, Nukunonu and Fakaofo) could be displayed.

Google Image Search Results -  Tokelau map

Google Image Search Results - Tokelau Map

Every readily available map used the same data source for their shorelines - WVS. The best scale to display all three atolls is 1:750,000. I thought that WVS would be the ideal source - Wrong! Knowing what I know about atoll shapes and the importance of including the reef as part of the shoreline, WVS was woefully inadequate.

The answer was simple - merely create a new vector file of these three atolls. Using Global Mapper and Landsat ETM+ as base imagery, I worked at a scale of 1:62,750 and digitized the land areas and reefs of these three atolls. Using Marplot I created this new layer of mapping information called Enhanced Vector Shoreline-Rough (EVS-R).

EVS-R and WVS (1-1,000,000)

EVS-R and WVS (1-1,000,000)

EVS-R and WVS (1-250,000)

EVS-R and WVS (1-250,000)

Not only is the EVS-R a more detailed image, but it is accurately plotted at this scale. You will notice that the WVS is misplotted further north than it should be.

It is a major improvement over WVS. What do you think?

Enjoy!

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