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Content & Tools => Maps => Topic started by: sonny on September 11, 2016, 21:17:19

Title: Precise LiDAR Terrain Models of Austria and other European countries
Post by: sonny on September 11, 2016, 21:17:19
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  (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 (http://www.openandromaps.org/oam-forums/topic/neues-genaueres-hoehenmodell-fuer-oesterreich)
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: Andrew Heard 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?
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: sonny 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.
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: balloni55 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?
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: sonny 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.
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: Dejan Jeremić Jera on September 12, 2016, 13:51:50
Can you please make 1"-sec versions of those for Serbia, Montenegro, Bosnia, Macedonia and Croatia  :)
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: michaelbechtold 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 ??
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: Andrew Heard 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...
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: jonny.blue on September 13, 2016, 11:52:39
Thanks ... works great.
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: Talbi 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 !!
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: Christian on November 21, 2016, 21:31:44
Thanks from me also.
The elevation gain of my alpine tracks got.... lower ;)
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: sonny on February 28, 2017, 01:07:05
I added terrain models of Luxembourg and some German provinces:

http://data.opendataportal.at/dataset/dtm-germany (http://data.opendataportal.at/dataset/dtm-germany)
http://data.opendataportal.at/dataset/dtm-luxembourg (http://data.opendataportal.at/dataset/dtm-luxembourg)
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: tapio on April 17, 2017, 13:05:00
Is there an all-in-one package? It's not too much data (in terms of megabytes) AFAICS...
But first and foremost I have to thank you!
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: sonny on April 17, 2017, 13:12:03
Sorry, no.
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: erfi on April 17, 2017, 22:53:28
Hallo sonny, the LiDAR Terrain Models are wonderful. Many thanks!
Is it planned to create a LiDAR 1" Terrain Model of "Sächsische Schweiz" (N50E014.hgt)?
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: sonny on April 17, 2017, 23:54:25
I'll probably do if there are once Opendata Lidar sources of this German province (Sachsen). Right now I'm afraid there's no such data available for free use.
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: tapio on April 18, 2017, 05:19:30
No free data for Sachsen, that's sad, I'm sometimes @ Erzgebirge.

Oh what a difference, I reset the height levels in Locus pro for some tracks and the Höhenmeter up/down (elevation gain ?) values went down e.g. from 9xx to 500 something...  :o But I cannot say for sure if I really used the old SRTM data or GPS data pulled by my phone. However, what a big difference. It's overall like 30-40% difference.
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: uatschitchun on December 19, 2017, 10:47:54
Is it possible to use the 20/50m models with Locus?
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: sonny on December 19, 2017, 17:52:01
i'm afraid not. But the 1"  models (.hgt files) are about as precise as the 20m models
Title: Re: Precise LiDAR Terrain Models of Austria, Germany, Slovenia, Spain
Post by: uatschitchun on December 19, 2017, 23:27:27
Ah ok, the hgt work well :-)

Thx for that!
Title: Re: Precise LiDAR Terrain Models of Austria and other European countries
Post by: sonny on April 15, 2018, 20:22:35
Switzerland and France are available now too:

http://data.opendataportal.at/dataset/dtm-france (http://data.opendataportal.at/dataset/dtm-france)
http://data.opendataportal.at/dataset/dtm-switzerland (http://data.opendataportal.at/dataset/dtm-switzerland)
Title: Re: Precise LiDAR Terrain Models of Austria and other European countries
Post by: sonny on May 18, 2018, 10:55:29
I spent many hours and weeks to collect and edit the source data for creating a DTM for the whole country of Italy. Most of the Italian regions provide more or less high quality data. For those who don't, I used 1" SRTM data.
Now the project is finished and available here:

http://data.opendataportal.at/dataset/dtm-italy (http://data.opendataportal.at/dataset/dtm-italy)
Title: Re: Precise LiDAR Terrain Models of Austria and other European countries
Post by: voldapet on May 18, 2018, 11:04:59
@sonny ...you're awesome!  We'll use it for LoMaps as your previous datasets. Thank you