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activityworkshop / GpsPrune

GpsPrune is a map-based application for viewing, editing and converting coordinate data from GPS systems.
GNU General Public License v2.0
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wishlist: elevation data #46

Open PezzeyRaus opened 2 years ago

PezzeyRaus commented 2 years ago

First of all: I have noted with great satisfaction that it is still possible in the latest version 21.1 to create elevation profiles in SVG format. I have one, no two suggestions for the wish list:

  1. the option to delete elevation data of a track file to replace it with new, more precise elevation data (for example Lidar-based instead of NASA-SRTM1) is missing.
  2. A menu option under "Settings/Set program paths" for the SRTM files path would be helpful.

I know all this can be achieved by other means (editing the gpx file with regex, copying every time the Lidar SRTM files from mine to the GPSPrune default folder), but it would be nice to have these features integrated in GPSPrune. Rolf

activityworkshop commented 2 years ago

it is still possible in the latest version 21.1 to create elevation profiles in SVG format.

You're right, nothing has changed there.

the option to delete elevation data of a track file

Of course, just select the range (or everything), then Range -> Delete field values and then select Altitude. You can then replace the altitude data with data from either SRTM1 or SRTM3 depending on how you have configured it.

for example Lidar-based ... is missing.

I'm not sure what you mean by that. You mean not from NASA, not from SRTM but from some airborne surveying data maybe? If you can point me towards some examples this might be possible.

A menu option under "Settings/Set program paths" for the SRTM files path would be helpful.

Currently GpsPrune downloads and stores the srtm data inside the tile cache, set by Settings -> Save maps to disk. It sounds like you have already obtained your altitude data by some other mechanism? In which case, yes, maybe it would make sense for GpsPrune to also look in your data directory. This is the first time I've heard of using height data from other sources though. Are the formats used by your source(s) identical to those of SRTM? Can you give examples?

I would propose that this path would be set in the "Configure SRTM sources" panel though, because it isn't a path to a program like the other items in "Set program paths" are. And maybe "SRTM" isn't a good term any more if your sources aren't from SRTM?

PezzeyRaus commented 2 years ago

Thanks for description how to easily delete elevation data in GPSPrune.This is really much easier than fiddling around with regex in Notepad++. I should read through twice before posting something :-). First, yes, the hgt tiles are in a directory of the local copy of my website and I would like to point GPSPrune to this directory. 2. I meant of course elevation tiles in hgt format, not SRTM. There is Sonny from Austria who turns lidar terrain models available in Europe into hgt files that can be easily exchanged for SRTM.hgt tiles. Sonny's server, which also offers elevation data available in GeoTIFF, is currently moving to a new (EU Commission ?) operator and is therefore offline. If you want to get an impression, you can have a look at https://data.europa.eu/data/datasets/dtm-germany?locale=en. Sonny's mail address is sonnyy7@gmail.com. The comparison https://bit.ly/comparisons-lidar-srtm between Lidar-DTM and SRTM-DTM is impressing!

edit 3 hours later: pointing to my local SRTM directory works perfect! I am busy right now with a hiking path in Romania. There lidar measurements are to be published by the government only from 2024 inshallah! If you noticed the info about Sonny's Lidar.hgt files, we can close this issue.

activityworkshop commented 1 year ago

Last year I wasn't able to find any files from "Sonny", as everything was offline, but I recently discovered this site: https://sonny.4lima.de/ which I assume is offering the same sources you were talking about.