The Book

Journey to Te-Ika-a-Maui Cover
Journey to Te-Ika-a-Maui Cover

Update May 2023

About time to make some money off this, so please go to a book store (in real or online) to order the book: Buy Now (EPUB) or Buy Now (AZW3) as an e-book for €9.00 or on paper for €36.99. Thanks.

Update May 2018

The book is there again! After much gnashing of teeth etc I decided to go with epubli in the final analysis, because their binding was much better. All the spelling mistakes have been corrected, and all the images were “recast”, i.e. using a new technique which I am calling gtx. This attempts to automatically adjust the gamma to a midpoint of around 0.5 on one clone of the image, does the contrast/saturation intensifier and advanced tone mapping on another, then it is left up to me to mix the two images and adjust the gamma again to around 0.5. Most pictures are now much brighter on the computer screen than is comfortable, but seeing them printed in trial runs leads me to believe that a gamma midpoint of 0.55 wouldn’t have hurt either. Anyway the result is viewable. The book is also available from Hugendubel, or Thalia. Several new pictures, several pictures printed in a larger size, and a few extra pages, all for €36.99. Read more…

Debriefing the Other Tramps

Tongariro Northern Circuit

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Buy Tongariro Northern Circuit Great Walk Topo Set – €3

Admittedly: The walk can be done in two days. But…

That would be turning into a raceway. If the weather is good, then the excursions to the Taranaki Falls and the Tama Lakes are indispensable. Since most of the track is very open, views from anywhere can be pretty spectacular, but these two sights should not be missed.

The Crossing itself passes between the two mountain peaks of Tongariro and Ngauruhoe and the question remains whether to climb these peaks. If the day’s section is only from Mangatepopo to Oturere or vice versa, then there would be time to attempt one peak. Ngauruhoe being much higher (2291 m) is more tempting than Tongariro (1978 m). However the surface of Ngauruhoe is loose scree and there is a real danger of snow falling at any time of the year, so that Tongariro is the better bet.

The condition of the “Hole” (Mangatepopo – Whakapapa) should be considered carefully. Recent rain will make this section almost impassable and in this case it is advisable to start or finish the track at the Mangatepopo carpark. Just make sure to arrange transport before starting the track. The bus that drops off the day hikers for the Crossing leaves at around 8:30. Read more…

Epilogue: Maps…

On topographical and geodetic maps, and PHP and JavaScript scripts for converting between the two

First day of the Milford Track
First day of the Milford Track. Buy the Milford Track Great Walk Topo Set (2013) – €5

I’ve occasionally said in jest that the earth is flat, at least for the purposes of drawing small scaled maps, such as those that appear in the pages of this blog.

But what I’ve somehow missed up until now is that there are two types of flatness.

For everyone with a GPS machine, let’s see what you have got and what you are missing. Your machine will produce degrees east or west of the meridian and north or south of the equator. That’s called geodetic data, and it’s fine. That’s what the elevation data produced by the SRTM (Shuttle Radar Topography Mission) are mapped out as, it’s the data that GEOrgET works with.

But it’s not the data that mapmakers express themselves in. They deal in things called Transverse Mercator projections, and they function a little differently from taking one “square degree” and squishing it into approximately its physical dimensions. Starting from a reference longitude (the north-south line), they branch off at various latitudes, initially directly to the east or west and map out a rectangular grid. Can you see what is going to be off kilter here? The further south you go, the more the line you are following, the tangent (to the east or west) will deviate southwards from the arc of the latitude. In the same way true north starts to deviate (in the Southern Hemisphere) to the east or west corresponding to how far east or west of the reference longitude you are. Read more…

Epilogue: Introducing GEOrgET 1.0

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GEOrgET 1.0, new 3D logo

By now the maps and charts derived from the GPS tracks that I’ve recorded have become part and parcel of the blog. The software responsible for this is GEOrgET (GoogleEarth Organiser, Editor & Toolkit). However, with the gradual publication of 1 arc second elevation data, it was time to have another look at the program to see if the greater resolution was worth accommodating.

Three areas needed reviewing: The first was cosmetic – the logos and how the program looked and felt; the second was introducing the 1 arc second data and adapting the program accordingly; and the third was the under-the-hood question of the coding.

The cosmetic improvements included the new 3D logos which were fun to design and implement. Then the program handling had to be addressed. Directory and file selection are now achieved with a single click which automatically reloads the page; and to avoid clutter the latest version of multi-version files is only ever shown, and non-editable files are never shown. Read more…

Technical Epilogue: Very Simple Method for Enhancing Saturation and Contrast

Introducing CSI

I have recently been revising the photo processing business in the hope of coming to terms with all of the photos from the last visit, perhaps even in time for a new trip. New life appears to have been breathed into PHP’s Imagick project so that it will now do a number of things that haven’t yet even appeared in the official documentation, although, if you scratch beneath the surface they are there. This means that my photo processing stuff can be developed with Imagick, which is preferable from a programming point of view (repeat after me: (I (do (not (like (lisp…)))))). After sorting out the median pixel business I was finding out how to get Imagick to do GIMP “grain extract” layering when I made an interesting discovery. Read more…

Technical Epilogue: On the Purple Fringe

A problem that arises in high contrast photography is purple fringing due to short wavelength light being refracted around a dark/bright transition. This is different from chromatic aberration of the lens which results in green/purple fringing at such transitions. The latter can be largely removed by resizing the red and blue channels. The classical fix for pure purple fringing has been to use Darla’s Purple Fringe script for the GIMP, but the results are rather modest and require fiddling with afterwards, as shown in these two images:

Lake Waikaremoana
Fig. 1: Lake Waikaremoana, March 20, high contrast snapshot with substantial purple fringing
Waikaremoana Darla PF
Fig. 2: Purple Fringe reduction with Darla’s Purple Fringe for GIMP. Note residual fringing

Read more…

Epilogue: Debriefing the Great Walks – Whanganui River Journey

Index

I’ve dealt with the kayak operators in the previous blog, now’s the time to look at my (our) side of things.

Travel Planning

Whanganui River Journey
Buy Whanganui River Journey GPS track here for €5
Although the general suggestion is to do either Taumarunui to Pipiriki (150 km) in five days or start further down the river at Whakahoro and do the trip in three days, these are very condensed trips with little room for error. I think the worst mistake made was to schedule the first overnight stop in Poukaria.

The big problem here is that leaving Cherry Grove just after 11:00 for a 36 km leg is just too much for one day. The kayaking alone takes a good five hours, so only two rather restricted stops could be scheduled in order to get to Poukaria by dusk. Also, this is the roughest part of the whole trip, with at least two major rapids, the result of which is that everything is wet, and Poukaria Campsite lies so close to the river that overnight drying of kit is impossible.

A much better strategy would have been to schedule the stopover in Ohinepane (22 km), after taking at least one full lunch break beforehand, and an afternoon stop at Laurens Lavender (1381 River Rd, Aukopae 3991, laurenslavender.com, signposted on the river) for a cuppa and a slice of cake. This would mean a mid afternoon arrival at the campsite, after which everything could be dried, the dry bags repacked, etc. The following day Whakahoro could be reached after 35 km – again about five hours of paddling – but this time with a departure at around 9:00 (or even earlier) and two breaks along the way and arrival at the campsite by around 4:00 which seems realistic. Here again I would make better use of the Blue Duck Café (blueduckstation.co.nz, evening meals by prior arrangement) here to get some fresh food to eat, and of the location of the campsite and hut on higher ground just outside of the valley proper to allow the gear to dry. Read more…

Epilogue: Debriefing Kayak Operators

Index

A question that has been asked, and will no doubt continue to be asked, was: “What kayak operators can you recommend?” I directly experienced eight in all (with queries being sent to another five), so while that may not be enough for a double-blind, randomly assigned, controlled clinical study, but it is sufficient to glean a few pointers from. Read more…

57. Kuala Lumpur – Amsterdam – Home

Wednesday, April 8: Amsterdam: Foggy, otherwise cloudy

This time I had one spare seat next to me, so the armrest went up as soon as we were in the air and I could spread myself out a bit. The departure had been delayed on the runway for GKW reason, and I was doubtful about getting out of Schiphol Airport on the train by 8:30.

But first the flight had to be dealt with. I took in the latest incarnation of The Great Gatsby, which I thought was not only overly detailed, but extravagant to the point of revoking my suspense of disbelief. Then there was the Dead Poets Society as an expression of respect for the newly deceased, but as I say there wasn’t that much to choose from. Was sorry to have missed Birdman on the way over. Read more…

56. Auckland – Kuala Lumpur

Tuesday, April 7: Auckland: Sunny & warm
Kuala Lumpur: Showers & warm

Couldn’t sleep much past 7:30 but by around 8:00 all five human inhabitants were up and about and I had my vitamin tablet, the last muesli bars and some coffee for breakfast, sorted out the last rubbish and the last stuff to leave behind (which would have been: Salt, sugar, rice, margarine, milk & bread for food, and the bed roll and tent in equipment) and surprisingly by not much later than 9:00 the suitcase had everything else I wanted & needed to take back in it and could be closed without any major compression. Read more…

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