PHOTO POSTER: RAFA POBO
already is near the Marathon XIII Penyagolosa Castelló i Mitja. Since yesterday, March 7 until next May 7, are open enrollment. Complete all the info, locations and registration form, prices, etc ... is available on the WEB CLUB MiM
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| This is my "masterpiece" to date. DOUBLE CLICK TO ENLARGE. If you want to download the highest resolution, can be done from the club's website MiM |
I asked him to do a profile to be posted on the official website and I accepted gladly. It was almost a challenge, given my limited knowledge in design. After a few sketches and some beauty tips from Rafa Pobo, the result (I) has been more than satisfactory.
have accepted my proposals for rectification with respect to official numbers, mileage, positive and negative slope. Therefore, we must be clear that the path is exactly the same and the references from your previous years are completely valid. What has changed is the measurement of travel. At about the methodology of measurement, I thought proper to make the following clarification to avoid confusion or artificial controversy.
MEASUREMENTS of the Marathon I MITJÀ (MiM)
A GPS measuring distance based on triangulation, ie not only connects to a satellite, but and several measures the distance traveled by the distance GPS receiver on between the different satellites to which it is connected. Therefore, the accuracy depends on the number of satellites that can connect to (can influence the geographical places, ravines, or weather conditions etc.). Typically, an accuracy of between 7 and 12 meters. I have even 3m accuracy with 12 satellites connected. Therefore, the accuracy is not invariable, but it is tolerable limits.
On the other hand, as it is realized the track, the device is storing points every few meters of which stores the length latitude, altitude and time of day. The longitude and latitude it gives the satellite. The height can give the satellite, the GPS if you have the same barometric altimeter, or if a GPS map with maps in (topography). Later, once the route is convenient to analyze the recorded track with specific software.
Problems with the GPS recorded track can come when it is done very slowly and have excessive points as they may appear small "fluctuations" that artificially increase the distance. The solution to this problem is to filter the track and remove points which increases the distance from point to point and can be avoided "Swings." Remove excessive points (such as simplified tracks 500 points) may have the added problem that can be eliminated curved sections of the route due to oversimplification and decrease the distance traveled. Therefore, as usual, is right to find the midpoint. My experience tells me that for a mixed track track-road travel as the MiM, may be sufficient between 50 and 70 points per km (less points the faster it runs) as predominant track or path.
The other major problem in analyzing the subsequent track recorded with software is to get the accumulated slope. There are plenty of small promotions and declines to say that "the GPS was invented." Even when traveling on flat terrain, the precision of GPS or a small loss of coverage can cause the GPS store what is called a point "aberrant." All these small imperfections can be corrected stored relief post with the software and topographic maps. Some of these maps have built a layer called layer "d" in 3D. It's like if you stopped to drop a sheet over the prominence of the peninsula and then acquired the form of such relief, the pudieses transport to your home computer. Thus, for any point you mark on the map (on the screen PC) automatically assigns latitude, longitude and height. This layer "d" is reliable as official maps National Geographic Institute (IGN). Topographic maps as Garmin V.3 TopoEspaña have built this layer tracks to analyze retrospectively the Mapsource software. In addition, this layer can also be charged in another specific software as fairly reliable and prestigious Compe GPS. Finally, another software as "Perfils" and "SportTracks" enjoying enough prestige and reliability, can correct heights on-line through internet connection via international databases (including NASA).
Therefore, and not get my fingers burnt with MiM measurements, should seek to make sure.
had several tracks recorded in different years, 3 with the Garmin Forerunner 305, 1 engraved with the Garmin Forerunner 310 XT and one engraved with the Garmin Dakota 20. I measured the amount of original points, the filter several times to remove points, even on the same track and on the computer screen, hand-drew the route to map layer data "d" 3D. This both Mapsource software as in the Compe GPS. Also checked the total distance I was in another type of software as "Perfils" or "SportTracks."
With respect to accumulated ascent, the procedure was similar: Analysis with Mapsource and GPS Compe (including hand-shaped), and updating of heights "on line" software " Perfils "and SportTracks.
The values \u200b\u200bshown in the triptych of the year 2011 are more reliable mean values \u200b\u200bobtained with the scheme described.
I do not think (much less) in possession of absolute truth, but it is true that the people who will run the MiM today and the curators of the federation do with GPS and they will get results very similar to mine (not the same, of course taking the tolerances)
I think the most important thing for everyone is to make clear that the course has not changed, or modified. Thus the references of previous years of each corridor are still valid.
In conclusion, I would say that the only thing I tried is to get the most reliable results possible with the technological tools currently available.
I hope this clarification will help solve some doubts.
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