Muntertool is a python command line tool for reading GPS tracks and finding the Munter Method rate parameters for that track.
The Munter method is a technique to take a cross country travel route and estimate the time it will take to travel using the topography of the route and a set of customizable rate parameters. This technique often produces useful estimates and is integrated directly into popular mapping tools like CalTopo. The basic formula for munter method estimation is:
TIME [hours] = (DISTANCE [km] + (ELEVATION [meters]/100)) / RATE
Since rate is variable by grade, a different rate parameter is used for Uphill, Flat, and Downhill segments. For example, Caltopo defaults to rate parameters (UP=4 FLAT=6 DOWN=10) for backcountry skiing and (UP=4 FLAT=6 DOWN=6) for hiking on a trail. Since every group travels at a different pace, these parameters usually have to be tweaked to get more accurate estimates. The purpose of this tool is to assist that guesswork by taking an actual recording from a previous trip and analyzing the track to show your munter rates. These rates can then be plugged back into the formula when planning a future trip.
Install muntertool directly from this repo by running:
$ python -m pip install "git+https://github.com/jackdeansmith/muntertool"
You can then run muntertool directly:
$ muntertool --help
Usage: muntertool [OPTIONS] COMMAND [ARGS]...
Options:
--help Show this message and exit.
Commands:
chunks Break GPXFILE into chunks and output details.
stats Analyze GPXFILE and output rate statistics.
stats breaks your file into chunks, classifies those chunks by their grade, and calcualtes summary statistics. By default, the chunk-length and grade-cutoff parameters are the same ones used by Caltopo so the rates are directly comparable.
Usage: muntertool stats [OPTIONS] GPXFILE
Analyze GPXFILE and output rate statistics.
Options:
--chunk-length FLOAT Length of chunk in meters that track is broken into
for analysis. [default: 50.0]
--grade-cutoff INTEGER Grade in degrees used to decide if a chunk is
uphill, downhill, or flat. [default: 5]
--percentile FLOAT Calculate this percentile for each chunk type.
Multiple uses allowed. [default: 0.5]
--progress Show a progress bar as gpx points are processed
--help Show this message and exit.
Example, simple analysis:
$ muntertool stats ExampleData/TrailRun.gpx
Grade #Chunks Mean Rate 50.0th Percentile Rate
------- --------- ----------- ------------------------
UP 46 11.1854 11.0837
FLAT 34 13.1513 12.754
DOWN 68 24.9152 25.3367
Example, getting conservative 20th percentile estimate:
$ muntertool stats ExampleData/TrailRun.gpx --percentile .2 --percentile .5
Grade #Chunks Mean Rate 20.0th Percentile Rate 50.0th Percentile Rate
------- --------- ----------- ------------------------ ------------------------
UP 46 11.1854 10.3015 11.0837
FLAT 34 13.1513 11.201 12.754
DOWN 68 24.9152 22.266 25.3367
chunks breaks your track into chunks and prints the information about every single chunk. It's useful if you want to see the distribution of rates or do your own analysis.
Example: Show all the chunks used to calculate munter rates for a trail run
$ muntertool chunks ExampleData/ShortTrailRun.gpx
Chunk Distance Elevation Time Grade Category Munter Rate
------- ---------- ----------- ------- ------- ---------- -------------
0 51.9948 7 0:00:52 7.7° UP 8.44579
1 55.2028 17 0:01:14 17.1° UP 10.9558
2 57.5539 14 0:01:09 13.7° UP 10.3072
3 58.1904 22 0:01:42 20.7° UP 9.81849
4 57.1072 19 0:01:33 18.4° UP 9.56544
5 55.9127 21 0:02:27 20.6° UP 6.51215
6 70.3727 29 0:02:48 22.4° UP 7.72227
7 50.4321 7 0:10:01 7.9° UP 0.72139
8 58.6931 -12 0:00:32 -11.6° DOWN 20.103
9 75.2313 -8 0:01:00 -6.1° DOWN 9.31388
10 81.741 -5 0:00:26 -3.5° FLAT 18.2411
11 65.0443 -7 0:00:22 -6.1° DOWN 22.0982
12 55.8014 -9 0:00:28 -9.2° DOWN 18.7459
13 85.2872 -5 0:00:54 -3.4° FLAT 9.01914
14 58.1878 -18 0:00:36 -17.2° DOWN 23.8188
15 54.8248 -17 0:00:36 -17.2° DOWN 22.4825
16 51.3016 -14 0:00:29 -15.3° DOWN 23.7478
Example: Show all the chunks used to calculate munter rates for a trail run and show start and end points for each chunk
$ muntertool chunks ExampleData/ShortTrailRun.gpx --showcordinates
Chunk Start End Distance Elevation Time Grade Category Munter Rate
------- -------------------------- -------------------------- ---------- ----------- ------- ------- ---------- -------------
0 (-120.7060764, 48.6941843) (-120.7055795, 48.6944802) 51.9948 7 0:00:52 7.7° UP 8.44579
1 (-120.7055795, 48.6944802) (-120.7051350, 48.6948639) 55.2028 17 0:01:14 17.1° UP 10.9558
2 (-120.7051350, 48.6948639) (-120.7047126, 48.6952632) 57.5539 14 0:01:09 13.7° UP 10.3072
3 (-120.7047126, 48.6952632) (-120.7042211, 48.6956084) 58.1904 22 0:01:42 20.7° UP 9.81849
4 (-120.7042211, 48.6956084) (-120.7038888, 48.6960668) 57.1072 19 0:01:33 18.4° UP 9.56544
5 (-120.7038888, 48.6960668) (-120.7035100, 48.6964223) 55.9127 21 0:02:27 20.6° UP 6.51215
6 (-120.7035100, 48.6964223) (-120.7030980, 48.6969418) 70.3727 29 0:02:48 22.4° UP 7.72227
7 (-120.7030980, 48.6969418) (-120.7026837, 48.6971308) 50.4321 7 0:10:01 7.9° UP 0.72139
8 (-120.7026837, 48.6971308) (-120.7019108, 48.6972488) 58.6931 -12 0:00:32 -11.6° DOWN 20.103
9 (-120.7019108, 48.6972488) (-120.7009376, 48.6973775) 75.2313 -8 0:01:00 -6.1° DOWN 9.31388
10 (-120.7009376, 48.6973775) (-120.6998594, 48.6975271) 81.741 -5 0:00:26 -3.5° FLAT 18.2411
11 (-120.6998594, 48.6975271) (-120.6989766, 48.6975518) 65.0443 -7 0:00:22 -6.1° DOWN 22.0982
12 (-120.6989766, 48.6975518) (-120.6982461, 48.6974178) 55.8014 -9 0:00:28 -9.2° DOWN 18.7459
13 (-120.6982461, 48.6974178) (-120.6971219, 48.6975453) 85.2872 -5 0:00:54 -3.4° FLAT 9.01914
14 (-120.6971219, 48.6975453) (-120.6964779, 48.6972659) 58.1878 -18 0:00:36 -17.2° DOWN 23.8188
15 (-120.6964779, 48.6972659) (-120.6958755, 48.6970033) 54.8248 -17 0:00:36 -17.2° DOWN 22.4825
16 (-120.6958755, 48.6970033) (-120.6952226, 48.6968485) 51.3016 -14 0:00:29 -15.3° DOWN 23.7478
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