Author Topic: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain  (Read 1259 times)

Offline sonny

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Dear Locus map creators and users!

I want to tell you, that I've created several Digital Terrain Models (DTMs), which are based on precise Opendata LiDAR-elevation data of the country's Geographical Institutes. Right now these are:
The improvements in accuracy, quality and fine details of my model's elevations compared to those of the popular SRTM-datasets are enormous. Especially in mountainous terrain.

You can use these new DTMs to create improved, more accurate contour lines in maps. Or you can copy the files for the area of your interest into the correct folder of Locus to improve dynamic elavation values and the shading of the maps in these areas.

The latest versions of Openandromaps in these countries are already based on my DTMs and people say the improvement of contour lines' (and dynamic elevation as well as hill shading) quality in the new maps are excellent.

Have a look at some map comparisons: Map using SRTM-DTM >>> Map using Laser-DTM: http://goo.gl/DM2YxD

There's also a thread regarding the implementation of these DTMs into Openandromaps (in German):
http://www.openandromaps.org/oam-forums/topic/neues-genaueres-hoehenmodell-fuer-oesterreich
« Last Edit: September 11, 2016, 21:26:32 by sonny »
 
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Offline Andrew Heard

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #1 on: September 12, 2016, 10:14:57 »
Top effort @Sonny. I checked some routes I planned in Slovenia a few months ago, and the visual improvement in calculated gradient is amazing. Much less noise too. Are there plans for other countries, for example France, Switzerland, and the remainder of Italy?

Maybe a question for @Arndt, I presume for BRouter to make better routing decisions involving elevation the RD5 files would need to incorporate the new HGT/ GeoTIFF data?
« Last Edit: September 12, 2016, 10:33:17 by Andrew Heard »
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Offline sonny

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #2 on: September 12, 2016, 10:31:20 »
If the country's Lidar-elevation data is Opendata, then maybe. But those of Switzerland, France are not available free. And for Italy (exempt South Tyrol) I'm unsure about the situation. And if Opendata - where to find LiDAR sources of the whole country.
 

Offline balloni55

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #3 on: September 12, 2016, 12:52:51 »
Hi sonny
screenshots looks very good 8) thanks

before i start testing a few small questions
Quote
Or you can copy the files for the area of your interest into the correct folder of Locus
- data/strm ??
- if so, should be the availabe hgt files of this area deleted?
- all files of unpacked zip, or only tif file?
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Offline sonny

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #4 on: September 12, 2016, 13:13:19 »
First of all:
- Just download the 1"-sec versions of the DTMs (or if you have little available memory on your phone: 3"-sec).
Not the 20m and 50m-versions, Locus can not use them.

- Yes, copy the .hgt-files into data/srtm folder of Locus.

- If there are already equal named files in this directory, just overwrite them (they have been automatically downloaded by Locus before and are based on less accurate SRTM-data)

You don't have to copy each .hgt-file of a country, just for the areas you are interested in.
Each elevation file (.hgt) represends exactly 1° x 1°, which could automatically derived from the filename. The filename specifies the southwest corner, e.g. "N47E014.hgt" represends an area from N47° to N48° latitude and E14° to E15° longitude.

- If you copied them I recommend to start Locus and once execute
Menu > Settings > Miscellaneous > Clear temporary data > (check all points)
to make sure, no old cached elevation or shading remain.
 

Offline Dejan Jeremić Jera

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #5 on: September 12, 2016, 13:51:50 »
Can you please make 1"-sec versions of those for Serbia, Montenegro, Bosnia, Macedonia and Croatia  :)
 

Offline michaelbechtold

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #6 on: September 12, 2016, 18:32:05 »
The first step is a site to download the LIDAR raw data free of charge.
Do you have links to those data sets ??
 

Offline Andrew Heard

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #7 on: September 13, 2016, 01:04:11 »
If the country's Lidar-elevation data is Opendata, then maybe. But those of Switzerland, France are not available free. And for Italy (exempt South Tyrol) I'm unsure about the situation. And if Opendata - where to find LiDAR sources of the whole country.
OK thanks for reply. One day...
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Offline jonny.blue

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #8 on: September 13, 2016, 11:52:39 »
Thanks ... works great.
 

Offline Talbi

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #9 on: November 21, 2016, 17:17:38 »
One of the best improvements for Locus since i use it,
all my tracks (the elevation data) are much more realistic than before, tipi-topi!!

THANKS A LOT !!
 

Offline Christian

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #10 on: November 21, 2016, 21:31:44 »
Thanks from me also.
The elevation gain of my alpine tracks got.... lower ;)
 

Offline sonny

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Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
« Reply #11 on: February 28, 2017, 01:07:05 »
 
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