Hi, Test of "my" .hgt files completed, right now. Background: ---------------------------------------------- - I'm not involved in your project, but I appreciate it very much !!! - I don't speak Java, but a bit JavaScript - I wanted to enrich my .gpx files out from Basecamp with height-data. - Project: WWW-Solution, NAS on my desk. http://tinyurl.com/yact8gm6 - 1. Try: Google Elevation service: Forget it in the mountains :-( - 2. Try: Use .hgt files, started with 3sec files from Viewfinderpanorama, not satisfactoring :-( - 3. Try: Use 1sec files from USGS http://dwtkns.com/srtm30m/ Hey, did work fine, but no files for the North available. - 4. Try: For the North, add files from Viewfinderpanorama Questions: ---------------------------------------------- Do I need all this if you add height-data to the OSM-maps ??? Will the results be comparable with using the original 1sec .hgt data ??? Dit you really find better height-data from Copernicus, will the .hgt-files be available ??? Results of my void-Test: ---------------------------------------------- look Attachment !!! - 3 sec files fro Viewfinder-Panoramas have a lot of void's - In the 1sec files from USGS I didn't find any void lg Peter Am 11.01.2018 um 15:29 schrieb Gerd Petermann:
Hi Nick,
you need the program DemDisplay from the display tool, source is here: https://svn.mkgmap.org.uk/svn/display/trunk Binary is here: http://files.mkgmap.org.uk/download/386/display.jar
Usage on a windows machine : java -cp d:\display\dist\display.jar;d:\mkgmap\dist\mkgmap.jar test.display.DemDisplay [--verbose] input-file > dem.txt (adapt the paths, I think on linux you need : instead of ; as a separator) input-file can be *.DEM or *.IMG containing a dem file.
The values are displayed in the "DEM sector header" as "map units between points (latitude):" and "map units between points (longitude)"
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von osm@pinns <osm@pinns.co.uk> Gesendet: Donnerstag, 11. Januar 2018 15:16:18 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] option --show-profiles and DEM
Hi Gerd,
Interesting ; some time ago , you mentioned that you were able to extract these values from the dem file structure.
Are they set in the headers? If so where so I can check some of the TOPO's
I'm having a problem with my gps64 , not the oregons, where I find its better to opt for a higher starting distance , ie 6628 for 1''
Nick
On 11/01/2018 14:10, Gerd Petermann wrote:
Hi Nick,
I also wondered why Garmin prefers 3312 while 3314 looks the exacter value. Found no explanation so far.
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von osm@pinns <osm@pinns.co.uk> Gesendet: Donnerstag, 11. Januar 2018 15:04:32 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] option --show-profiles and DEM
Hi Gerd
should 3312 logically be 3314 (2^32/(360*3600)) ?
Not that it matters much.
r
Nick
On 11/01/2018 13:48, Gerd Petermann wrote:
Hi Andreas,
you are right, thanks for the hint. I took those from the transalpin demo map, but the last two levels are empty. So, r4045 now says Example which should work with levels="0:24, 1:22, 2:20, 3:18": --dem-dists=3312,13248,26512,53024
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von andreas.schmidt.hetschbach@t-online.de <andreas.schmidt.hetschbach@t-online.de> Gesendet: Donnerstag, 11. Januar 2018 14:38:24 An: Development list for mkgmap Betreff: [mkgmap-dev] option --show-profiles and DEM
Hi Gerd,
I got a bit confused when I read the doc/example
--dem-dists=number[,number] If given, the option specifies the resolution(s) or zoom level for the DEM data. If not given, mkgmap tries to determine a reasonable value based on the resolution found in the *.hgt files. For PC programs like MapSource or Basecamp you only need one zoom level, for gps devies you need one for each resolution given with the --levels option. The actual values are given as distance between two DEM points. Higher disances mean lower resolution and thus fewer bytes in the map. Reasonable values for the highest resolution are somewhere between 1648 and 5520, 3312 is often used. Example which should work with levels="0:24, 1:22, 2:20, 3:18, 4:16": --dem-dists=3312,13248,26512,53024 This was found in a Garmin Demo map for transalpin data created 2009.
There are only 4 values for –dem-dist ,although there are 5 „Levels“. This seems to be in contrast to „…for gps devies you need one for each resolution given with the --levels Option ?
Regards
Andreas
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Von: Henning Scholland<mailto:osm@hscholland.de> Gesendet: Donnerstag, 11. Januar 2018 12:55 An: mkgmap-dev@lists.mkgmap.org.uk<mailto:mkgmap-dev@lists.mkgmap.org.uk> Betreff: Re: [mkgmap-dev] option --show-profiles and DEM
Hi all,
I don't see a reason to have this option at all. It should be set automatically to 1 if either contour data or DEM is written. If this data is in the map, you always want to have it and if those are not in the map, you don't need it. Or am I wrong?
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