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, September 09, 2006

Baker & Howland Islands US

Baker and Howland Islands US

Two small chunks of real estate in the middle of the Pacific Ocean. I would image the shipwrecked sailor would be ecstatic to land on either of them. That would be for a short while. Once that sailor determined that neither island has any water, their joy would turn to desperation. As I teach my students, the absolute first prerequisite people require to sustain life is water. Sure, you can drink filtered urine. You can even drink unfilter urine. But that is a temporary measure. This is a part of the Pacific that doesn't generate much moisture laden clouds.  No rain, no water.

The islands are great for seabirds, they can discover water where you and I wouldn't. Consequently, these islands are for the birds, literally. They are both classified as a National Wildlife Refuge maintained by the US Fish and Wildlife Service.

Both Howland Island and Baker Island have great Wikipedia entries. They require special permission to visit. About the only people traveling to the islands today, besides the shipwrecked sailor, are ornithologists, radio amateurs and Amelia Earhard researchers.

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Darnley Island (aka Erub) AS

Darnley Island (aka Erub) AS

Darnley Island (9°35'S., 143°46'E.) lies 7.5 miles S of Brown Reef. The island rises to a height of 181m and, in clear weather, may be seen from a distance of 25 to 30 miles from seaward. A coral reef, approximately 0.5 mile in diameter, lies 3.2 miles W of Darnley Island.

Anchorage.—Anchorage may be taken in Treacherous Bay, on the N side of the island, in 26 to 27m, about 0.5 mile offshore. The anchorage is protected from SE winds.

(SD Pub-128)

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Darnley Island (aka Erub Island) has a small population that earns it's living from farming and fishing.  The island is part of the Torres Strait Islands, a group of 274 small islands that form stepping stones between New Guinea to the north and Australia to the south.  Darnley Island is located near New Guinea.  You can learn more about the Torres Islanders by checking out this Wikipedia link.

The mapping was relatively fast.  Nothing really complex about the project.  I do enjoy mapping the reefs the ring the islands in this area.

Enjoy!

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Friday, September 08, 2006

Thoughts - "EVS" Means "Whatever."

Still many of you are cruising onto this site wondering what Islands has to do with the Aussie slang expression "Evs".  So, if you want to see island maps and images or discuss mapping topics you are at the right place.  If you want to know all about Aussie slang, Like roo or dingo or "Evs", this ain't the place.

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Wednesday, September 06, 2006

Comparison - Navteq River vs. EVS River

Ili River KZ - A Comparison of Navteq vs. EVS

I mentioned in previous posts that the best global river shorelines that I have encountered are Navteq shorelines. It looks like they might have used Landsat imagery to create their river shorelines. If someone associated with these river creations wishes to comment, go for it. The rivers are good, but they do not compare to EVS precision. My river shorelines and island details are excellent and extremely precise compared to Navteq's efforts. See for yourself.

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Thoughts - To All of You Searching For "EVS, Australia"

About 25 curious folks from throughout the United States have visited EVS-Islands over the last 3-days.  They searched for "EVS, Australia" and ended up visiting "EVS-Islands".  I am not sure if they were actually hunting for Electric Vechicles or the EVS Knee Brace Company.  I do know that they stopped in and most of them visited my post about Australian Estuaries.  I hope if you were or are one of the visitors you enjoyed you visit at my site.  Come again!

By the way, does anyone know what they would have been hunting for in the first place?  Just curious. 

4 Comments:

"evs" is apparently Australian slang, made popular by a performer on the American reality TV show "Rockstar: Supernova".

Australians have some cool lingo; a guy on the same webhost as me has an Aussie slang dictionary with more examples, though evs isn't there yet.

-J

By Anonymous Jason Birch, at 9/06/2006 06:58:00 PM  

Uh, I meant "made popular among north american youth by"... Obviously it was popular in Melbourne before that show :)

-J

By Anonymous Jason Birch, at 9/06/2006 07:00:00 PM  

It's slang for "whatever", in a petulat teenager way. :)

By Anonymous Anonymous, at 9/07/2006 07:22:00 AM  

It was said quite a few times by Toby Rand of Australia (a contestant on cbs's rockstar:supernova). He said it means "whatever" as the previous commenter said.

By Anonymous Anonymous, at 9/14/2006 08:58:00 PM  

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Lake Kapchagai KZ - An Ambitious Digitizing Project

Lake Kapchagai KZ

This is a very old project. It predates my EVS-Islands blog. Why post it now and on an islands blog site? I just felt that it would be interesting. This lake is one of the largest in the world. At the western end of the lake is a dam that helped to dry up the river to the north of it. Not a good thing. The river that flows to the north is the Ili River. I mapped the river as well as the lake. It was very time-consuming to complete both the lake and the river.

Enjoy the slideshow. It shows the lake from 1:400,000 down to 1:50,000 at three sites within the lake.

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Monday, September 04, 2006

Minami-Daito Jima JA

Minami-Daito Jima JA

This looks like Thomas the Train's island of Sodor. Look at all of the plots of land. This island is heavily cultivated. It has some interesting features - the windbreaks made up of trees that form two concentric rings around the island, the remnant of the lagoon, that is now small lakes (not sure if they are brackish or not). This looks like a nice, tidy island that most probably gets beat to death from the typhoons that rip into Japan and China from the south.

Enjoy the island!

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Sunday, September 03, 2006

How To Make a Map of a River at EVS Precision

African River

How do you make a map of a river?  The same way you create a map of an island, carefully and with precision.  I have made river maps before and they are challenging. Riverine shorelines are more dynamic then island shorelines.  They have these swampy shores that are half river and half shore.  Where does the river end and the shoreline begin?   Rapids offer a different challenge.  Are you mapping rapids formed by below water features or above water features?  How many of the above water features should you digitize?  And riverine islands are most often half river and half shore continuing the challenge of river mapping.

My real objective was to determine a reasonable length of river that I might be able to digitize in a typical work day.  It turns out that this 150-kilometer stretch of river took one work day to complete.

Now for the "How To" part.  First you must determine the resolution you will work from to create the maps at the scale your client requires.  Working from Landsat ETM+, I determined that 1:12,500 was a good resolution to work from to create 1:25,000 scale river shorelines.  For some features I work at 1:6,250.  The digitizing is a slow steady progression of vectors being placed on the shoreline image.  The order of feature digitizing is one shoreline and then the other moving in down-river direction.  Finally, the riverine islands and above water features are digitized.  The secret is to work steady and not try to do too much with the shoreline.

Digitizing the River Shoreline

If the digitizing line (yellow line), which is about 5-meters thick (on-screen), covers the indentation make a straight line.  If the shoreline indentation extends beyond the digitizing line, follow the indentation.

Do you realize how poorly mapped most rivers are?  The only consistent river mapping that I am aware of at 1:25,000 scale is country topographics. Few of these are digitized and the costs are prohibitive.  The Digital Chart of the World (DCW) rivers consist of thin blue lines, not good for detailed studies.  Navteq shows rivers that are roughly approximations of the underlying rivers as depicted on Landsat. However, they aren't EVS precision.  However, rivers, such as the one in this post mapped at EVS precision are as good as the base imagery they are taken from.

1 Comments:

Looks like a great undertaking!

Just out of curiosity, what is the methodology you are using to correlate imagery resolution and zoom level to digitized accuracy? It looks like you stay at a consistent zoom level and pan from scene to scene, which would allow a computed accuracy and precision value.

With regard to inaccurate streams, there may be many reasons for this - shorelines tend to vary quite a bit from season to season, and from year to year, particularly if there have been flood events or in flat areas, such as river deltas. Or are you more typically finding shorelines which are wholly misplaced (such as outside of the observed floodplain?

By Blogger Dave Smith, at 9/04/2006 12:01:00 PM  

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