LiDAR- Digital Terrain Models (DTM) as ZIP possible ?

Locus does need the hgts as files, not embedded in a ZIP as far as I know.

In the end, ZIP files are useless anyway, because the hgt is needed on the fly - and as FAAAST as possible. Ergo: no ZIP, because expanding takes time and battery - times 10 or 100s, depending on the size of the area you are researching.

Very interesting, hence I immediately did a test:

1) zipped a hgt file into the srtm folder

2) deleted the hgt file

3) started Locus, dynamic elevation activated

4) rather than using the zip file, Locus downloaded the missing hgt file ...

What is the difference between our Locus?

Cheers

Michael

I don't believe it's a caching issue. My SRTM folder contains all the Sonny ZIP files for Ireland. It never contained the raw .HTG files. Menion may care to confirm whether .ZIP is supported.

I did same test and it doesn't work for me neither with full France (only zip from Sonny, 1'', and no hgt). Dynamic elevation is not displayed.

It would have been very nice indeed

@Menion: can you please advice?

Thank you and cheers Michael

Hi guys,

there is probably some magic on the Andrew side, because zipped SRTM files are not supported 😊. Interesting idea. We will probably discuss native support for download 1'' files soon and here zipped files may help. But it will be necessary to work in similar way as map themes (as mentioned by Michael) > a lot of extraction to private directory.

PS: and when you extract to private directory, the space explosion will happen there, in particular for the 1" variant.

In other words: there is no magic at hand at all.

PPS: the ZIP approach would ease one problem, though: exploding download volumes (for the 1" ones) by the Locus internal automatic download from your servers.

Yes, that is correct. And mainly during shading in the higher zoom, this may cause a massive slowdown ...

Not ideal ... sorry.

--

So, this feature is not supported and I currently do not see any major benefit to doing it (sure, except saved space).

PPS: data are of course already downloaded compressed.

Weird - what magic would that be/ what more can I check? I have again checked tablet & phone - both currently only have 24 x *.ZIP (Sonny's Ireland) + WW15MGH.DAC in locus/data/srtm. I've also done a Solid Explorer search for *.HGT with no results. My test is to create a short route with the route planner then check the elevation profile - which looks reasonable, and LM4 does not complain of missing data files.

Andrew, are you talking about elevation in route planners?

And we are speaking about dynamic elevation display on the map dynamically.

I tried without hgt, and no dynamic altitude, but route planning is calculated with altitudes.

Difference may be there.

@Mick FU - yes, elevation in route planner.

>Difference may be there.

yes, maybe

so where does elevation for the Route Planner come from? if not from HGT, then RD5 file(s)? surely more than just dynamic elevation display?

Elevation in route planner computed by the BRouter or LoRouter does not need an offline elevation data. The router already includes these data inside (based on 3`` HGT files!

Simply try to "Update elevation" on any saved route ...