[talk-ph] request for testing 10m contour for garmin (was Re: Groundtruth.)
Rally de Leon
ralleon at gmail.com
Fri Jul 30 07:18:20 BST 2010
Groundtruth (contour) runs on my mapsource. I initially loaded 6 tiles
(from east to west -- Quezon sierra madre, Rizal to Batangas, NCR to
Bataan) on my 76CSx, together with the latest osmph_garmin. They show
on top of each other (transparent). Didn't crash on my garmin.
However, with the low-res screen of 76CSx (Details set to Normal), the
contours on the mountain portion is only usable (readable) at
zoomscale 2km & below. At 3km above, the 100m contour lines tends to
clutter the mountainous portion of the map (fortunately there aren't
many roads & POI's there).
Redraw speed was ok. I didn't notice any problem (on normal
street-level zoom), but I'm doing only around 30kmh, coz i'm also
collecting tracks at that time. But on 'over zoom mode' (12-20meters
scale), redraw speed slows down a bit, but still acceptable (while
driving); Although this will not be an issue at walking-pace of
mountain-hiking gps users. I don't know what will happen if I load the
entire groundtruth map (around 180mb) together with osmphgarmin map.
let's see later if my unit will crash :-)
76CSx with External Antenna on top of car (roughly 1-1/2 meter above ground)
GPS signal availability & strength was very good (EPE alternating
between 2 to 4 meters)
On initial test on Antipolo Hills this morning (an area above
120meters elevation), I parked my car exactly on top of a few
10m-contour lines that I crossed along the road, and compared their
Elevations with the readings of Barometric Sensor Elevation of 76CSx.
Not bad !!! (there's only 3-5 meters difference, sometimes exactly the
same like on the 10meter contour lines).
Well, considering other factors like height/location of antenna on top
of my car & low EPE of gps, initial test says we can possibly navigate
in zero-visibility mountain area (using STRM 10meter contour data)
with lesser chance of falling of a cliff.
I wish other people can test this (STRM data) map on other higher
areas to verify my findings (if high-accuracy is same on other
On Wed, Jul 28, 2010 at 8:31 PM, maning sambale
<emmanuel.sambale at gmail.com> wrote:
> Anyone interested to test this?
> 10m contour interval for Garmin devices. Download the link below (~200 MB):
> The contour were generated from SRTM data using Groundtruth. The data
> was divided into 0.75 grid tile.
> Beware: Loading the full Philippine map crashed my device! Please
> test if this works for your own device.
> I am interested in the following scenarios:
> 1. If you only add a limited number of contour tiles, does it crash your unit?
> 2. If you add only the contour and not the osm-ph map, does it crash as well?
> 3. At what zoom level does it crash (watch the map scale)?
> On Tue, Jul 27, 2010 at 11:41 AM, maning sambale
> <emmanuel.sambale at gmail.com> wrote:
>> Last time I checked, groudtruth uses the cgpsmapper to compile garmin
>> maps. The free cgpsmapper has a lot of limitations (i.e. limited
>> routing), unless you but the pro version. However, I used groundtruth
>> to generate contour maps based on SRTM. I intend to provide free
>> download soon. If anyone wants them for testing, let me know. My
>> unit crashed when I loaded the whole country's 10m elevation contour!
>> On Tue, Jul 27, 2010 at 12:47 AM, Eugene Alvin Villar <seav80 at gmail.com> wrote:
>>> Here's the original blog post (Dec. '08) by Ground Truth's creator about the
>>> difference between his tool and the popular mkgmap tool, which maning uses
>>> to create the OSM-PH Garmin maps.
>>> Take note that the post is back in 2008. Things probably changed a lot since
>>> On Mon, Jul 26, 2010 at 7:59 PM, Jim Morgan <jim at datalude.com> wrote:
>>>> Just found this tool for making Garmin images from OSM data
>>>> GroundTruth v220.127.116.11 by Igor Brejc
>>>> Generates Garmin maps from OpenStreetMap data
>>>> Visit http://wiki.openstreetmap.org/wiki/GroundTruth for more info
>>>> Also a helpful step-by-step guide.
>>>> I don't have a Garmin. But I thought it might be useful. Looks quite
>>>> customisable as well. You can make eg a hiking map using a different set of
>>>> groundtruth makemap
>>>> datalude: information security
>>>> e: jim at datalude.com
>>>> Philippines: +63 2 403 1311 / mob: +63 920 912 5830
>>>> Hong Kong: +852 6840 6693
>>>> w: http://www.datalude.com/
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>>>> talk-ph at openstreetmap.org
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>> blog: http://epsg4253.wordpress.com/
> "Freedom is still the most radical idea of all" -N.Branden
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