weiaun's blog

New Data Sources

There are now newer versions of data available:

ASTER-GDEM v2 (Oct 2011)

http://asterweb.jpl.nasa.gov/gdem.asp

TanDEM-X (not yet available; not sure if it will be public)

http://www.dlr.de/eo/en/desktopdefault.aspx/tabid-5727/10086_read-21046/

GSHHG (Jan 2013)

http://www.ngdc.noaa.gov/mgg/shorelines/gshhs.html

SWBD (Feb 2005)

http://dds.cr.usgs.gov/srtm/version2_1/SWBD/

64-bit Windows

For users of 64-bit Windows, please note that the registry files need to be slightly amended to include "Wow6432Node", for example:

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Garmin\MapSource\Families\xxxxx

I've included amended versions of all these reg files under each of the mapping products.

Malfreemaps Forum

As I don't have the time to maintain users and comments on this web-site, please use the Malfreemaps forum for discussions related to these mapping products:

http://www.malfreemaps.com/viewtopic.php?f=23&t=4616&start=0

Difficulties Downloading

If you have difficulties downloading the large zip files (e.g. dropped connections), I suggest using wget.

New developments

After some months of inactivity, decided to update some of the maps on this web-site. Here are the main changes:

1. Compatibility with more current versions of Mapsource

I finally decided to upgrade my own version of Mapsource so I had to figure out how to make the maps work on versions later than 6.13.7. In the end, it was actually not that difficult - just some minor changes with the registry. I'm viewing all the maps that I updated on version 6.16.1 and it seems to be fine - even the Indonesian map which is made out of 400+ tiles totalling 2Gb.

Thailand is coming very soon

Managed to figure out a way of making the map as a batch. So I managed to compile all 161 tiles of the up and coming Thailand map with very little user intervention but a lot of computing time - seven days just to vectorise the data, for example. This Thailand map also includes substantial bits of the surrounding the countries - for example it includes these cities: Rangoon, Phnom Penh, Hanoi, Ho Chi Minh city and Vientiane.

It's huge - 1Gb.

Compiling the ASTER GDEM, what I've learnt

Here is what I've learnt during the three steps required to compile the ASTER GDEM into a topographic map viewable on a Garmin GPSr.

ASTER GDEM v1 to be reworked

I've realised that I used a less than ideal setting for the Level0 setting. I should have used 24 but I used 22. I believe this value relates to the number of bits allocated to addressing points on Level 0 - the level in which the detailed 10m contours reside. 24 bits corresponds to a resolution of 2.4m vs 9.6m for 22 bits. Perhaps this explains why there was a considerable loss in the resolution of the contours after converting it with cgpsmapper.

Will re-compile and upload an updated map soon. Am expecting it to be bigger but with more detail preserved.

South East Asia Topographic Map

Am in the final stages of producing a topograpic map of much of South East Asia using the SRTM 4 data. For practical reasons, have reduced the vertical resolution to 50m contour line intervals. Will publish this soon ...

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