|  Author | Topic: Corregidor Digital Ordnance Mapping Project (Read 341 times) |
EXO
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|  | Corregidor Digital Ordnance Mapping Project
« Thread Started on Oct 26, 2008, 1:28pm » | |
The Corregidor season for most of us is coming up - January/February. Some of us are making lists, and checking them twice - not of what we want Santa Claus to bring us (we've all been nice, haven't we?). Our lists are of those places we'll be researching when we are back on Corregidor "next time."
One project name I hope you will be hearing more about, and which will be well progressed by then, is the recently created C-DOM PROJECT - "CORREGIDOR DIGITAL ORDNANCE MAPPING". This project is being coordinated by Martyn Keen, who has been wowing a small group of us by his output of brilliant cartography. Assisting us in the project are John Moffitt and Karl Welteke. Already, C-DOM is proofing a number of maps in the latter stages of preparation. They include:
* 1921 Map, involving a Master Sheet and eight sectional maps;
* 1921 Map as a single sheet, incorporating all the data from the eight sectional maps;
* 1941 Roads and Trails, aka the Emergency Defense Map of 1941 - as a single sheet;
* 1932 Map, the comprehensive basis for what we variously call the '36 or '37 Map. This map, the grail of Corregidor maps, is to be reproduced with its five foot contours! A small team of us will be on Corregidor to assist in enhancing the utility of this map by making it as accurate as GPS can assist.
The intention is that these maps, which Martyn has licenced to the Corregidor Historic Society, can be used to raise funds for the enhancement of the website.
There are a classified number of overlays being produced too - we are working on "as designed" plans of Malinta and Middleside tunnels, and will be attempting to allign them with the known exterior portals, and thus producing an accurate "as constructed" inventory.
One blind spot that we are still suffering from - nowhere have any of us ever seen any authotitative drawings of the Navy Tunnels - Queen, Roger, Sugar and Tare. The USN sure either knows how to keep a secret, or has managed to mis-file the drawings.
Each time a new map or update arrives from Martyn, I am constantly amazed at the magnificence of what he's producing. Just now, he sent the following rough draft of the area around San Jose, as drawn in 1932. The pic is only at 30% - can you imagine what it's like being able to zoom into it, and take a digital walk through it?
I hope it excites you as much as it excites me.
![[image]](http://corregidor.org/bb/1932_san_jose_trial_plot.jpg)
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micahwcollins
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| | Re: Corregidor Digital Ordnance Mapping Project
« Reply #1 on Nov 4, 2008, 1:46pm » | |
Wow that is impressive!! Martyn is doing an excellent job with that i must say! Im new to this forum if you're wondering! I grew up in the Philippines and am now in the US going to college but during my high school years in Manila I went out to Corregidor more times than I can count. I had lousy maps so pretty much i just explored on my own and found what I could. This digital map can provide endless possibilities as far as locating specific places with a GPS. I mean if this map has coordinates, it would be easy to find anything on the Island with a GPS. That is something to be excited about!
Micah
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mapmaster
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| | Re: Corregidor Digital Ordnance Mapping Project
« Reply #2 on Sept 17, 2009, 7:16pm » | |
Hi Everyone
I have nearly finished digitising the 1936 Corregidor Map and I have been thinking about how to prepare a copy of the map for loading onto a GPS. We will still need to do a lot of work collecting waypoints on Corregidor before we have a really good GPS map.
However, as a challenge for me, I decided to start looking to see how easy or hard it would be to put a copy of the 1932 Corregidor Map on a Garmin GPSMap 60CSx. There is a bit of work involved as well as four programs needed, but it is a relatively straight forward process.
As a result of the challenge, I was able to prepare a map file and load it onto my Garmin 60CSx using shareware and temporary program licenses. The result is a test GPS map that we can use on the GPS belonging to the mapping project group members.
![[image]](http://i367.photobucket.com/albums/oo117/mgk0951/Mapping/new-3.jpg)
Screen shot of Garmin GPS with Lorcha Dock and North Mine Wharf visible
![[image]](http://i367.photobucket.com/albums/oo117/mgk0951/Mapping/new-4.jpg)
Screen shot of Garmin GPS with the Hospital visible
This will be handy for finding lesser known structures and features. These can then be recorded as a waypoint to help geo-reference the final GPS map.
The test map is a background map. Points of interest can be determined from a hard copy or digital copy of the a Corregidor map and then located on the screen of the GPS. A temporary waypoint can then be placed over the point and 'navigated to' using the GPS.
The test map is basically a conversion of a simplified copy of the 1932 Corregidor Map. Text and all but the 50 foot contour intervals have been removed. However, all the buildings, roads, railways, batteries and other defence structures are visible.
The only problem is the resolution/map placement of a Garmin map is 2.4 metres. The digital Corregidor map contains structures positioned to 0.01 metres. The result is that line work and structure outlines are somewhat zigzagged.
However, we now have a simple test map to aid in the GPS map preparation and I now know how to prepare the future GPS map.
Regards
mapmaster
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fots2
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| | Re: Corregidor Digital Ordnance Mapping Project
« Reply #3 on Sept 17, 2009, 8:42pm » | |
I have been waiting for a detailed map to use on my GPS for two years. Previous to this, all that was available was a map showing a rough coastline, a couple roads and a handful of useless waypoints.
If you are at a group of structures in the low visibility jungle, this new map will let me know exactly which one I am looking at and I can accurately decide which direction my next destination is. No more counting buildings as I walk along and then guessing.
Another advantage is if I have to detour around something such as a stand of bamboo etc, I can do that and when in the clear again, just glance at the GPS for the correct direction in which to continue.
With a little bit of common sense, Corregidor is not a place where you can get lost. The advantage of GPS is you can approach any remote structure or tunnel from any direction and find it the first time. No more wandering around the area or zig zagging to find it.
Although this map is the first one produced and not 100% accurate, I should get quite close to where ever I am heading for. It will be interesting to put it through its paces. That opportunity will come next month. By collecting more waypoints the map accuracy will even improve over time.
Thank-you mapmaster for all your efforts in creating this map.
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EXO
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| | Re: Corregidor Digital Ordnance Mapping Project
« Reply #4 on Sept 17, 2009, 11:08pm » | |
Mapmaster,
A triumph! Your GPS 'proof of concept' is magnificent.
Congratulations to the usual suspects!
I am presently in Phoenix AZ at 503d PRCT Reunion, where I have introduced them to your digital wonders. Copies of the jump map are a hit. Unfortunately, no on has offered to trade in his old one on a new digital model.
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