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Snowdonia Half Marathon, 2024 course map and altimetry

Snowdonia Half Marathon: 2024 route, altimetry, gpx

Note: "Snowdonia Half Marathon" is NOT organized by goandrace.com

Snowdonia Half Marathon course map. Lenght: 21.098 km (13.1 mi).

21.098 km (13.1 mi) course map of the event "Snowdonia Half Marathon" in Llanrwst (Sunday, May 12, 2024). Explore the route!

Do you want to fly over the path with a Google Earth 3D video? Click on the following link: Snowdonia Half Marathon, fly over the path (3D video).

GPS track - .gpx file download

Download the gps race path by clicking here. You can send the .gpx file to your Garmin watch or other compatible device and follow the path. For instructions on how to upload the GPX file onto your Garmin watch click here.

 .gpx file download

NB: it is possible that the length calculated from the gpx file is greater than that of the race, with an error typically of 1-2%, so for example a half-marathon could be 2-300 meters longer.

Click the following link to visit the Snowdonia Half Marathon event page.

Snowdonia Half Marathon: route altimetric information


Snowdonia Half Marathon: GNR-GAP index (v 1.0, experimental, see more)

Snowdonia Half Marathon: interactive route

You can set the km (or mile) markers and you can select different types of layers (Satellite or Openstreetmap).

Snowdonia Half Marathon: altimetry graph

Snowdonia Half Marathon: slope graph

Snowdonia Half Marathon: percentage distribution of slope

Snowdonia Half Marathon: Km by km route altimetry analysis

Lap Start Alt. End Alt. Diff. Alt. Aver. Slope Min Alt. Max Alt. Tot Climb Tot Descent
KM 0-1 7 65 +58 +5.8% 6 66 59 1
KM 1-2 65 139 +74 +7.4% 50 132 89 15
KM 2-3 139 207 +68 +6.8% 141 208 69 1
KM 3-4 207 210 +3 +0.3% 206 223 16 13
KM 4-5 210 192 -18 -1.8% 189 209 4 22
KM 5-6 192 188 -4 -0.4% 188 192 2 6
KM 6-7 188 275 +87 +8.7% 189 275 87 0
KM 7-8 275 284 +9 +0.9% 276 320 45 36
KM 8-9 284 198 -86 -8.6% 202 283 0 86
KM 9-10 198 191 -7 -0.7% 169 194 20 27
KM 10-11 191 202 +11 +1.1% 190 205 11 0
KM 11-12 202 201 -1 -0.1% 197 206 9 10
KM 12-13 201 192 -9 -0.9% 193 221 17 26
KM 13-14 192 187 -5 -0.5% 186 193 1 6
KM 14-15 187 131 -56 -5.6% 135 186 0 56
KM 15-16 131 86 -45 -4.5% 87 132 0 45
KM 16-17 86 62 -23 -2.3% 65 84 3 26
KM 17-18 62 144 +82 +8.2% 42 144 98 16
KM 18-19 144 149 +5 +0.5% 151 175 30 25
KM 19-20 149 60 -89 -8.9% 50 148 8 97
KM 20-21 60 6 -54 -5.4% 6 67 1 55
KM 21-21.10 6 7 +1 +0.1% 7 7 1 0

GNR-GAP index - Go&Race Algorithm Estimate

Based on the elevation profile analysis, running on this course is estimated to result in a pace that is 13.3% slower.


For example, a runner who maintains a pace of 5'00"/km (8'03"/mi) on a flat 21.1 km course, corresponding to a finish time of 1h45'29", is estimated to complete this course in 1h59'31". The recalculated average pace (GAP) improves to 5'40"/km (9'07"/mi), making it 0'40"/km (1'04"/mi) slower.


The following graph illustrates the Pace Adjustment (PA) factor applied to the pace along the course. The horizontal red line represents a PA of 1, meaning no pace adjustment. Above the line, the pace is slower; below the line, it is faster. The table below also provides estimates for other pace ranges.



Predict your race or analyze your performance!

This following table shows simulations for paces between 3 and 6'/km.


RACE PREDICTION
To estimate a possible race time, use the "Pace" or "Time without slopes" column, which are valid for a flat course.
For example, if you think you can cover this distance on a flat course at a pace of 4'40"/km (or 7'31"/mi), i.e. in a time of 1h38'27", the estimate is to complete this course in 1h51'33", corresponding to a pace of 5'17"/km (or 8'31"/mi).

PERFORMANCE ANALYSIS
If you have run this race, use the table to estimate the equivalent time on a flat course. Check the "GAP" column and find the value closest to your pace, or compare the "Time with slopes" column with your time: on the same row you will find the pace and the equivalent time on a flat course in the "Pace" and "Time without slopes" columns.
For example, a time of 1h47'34" (pace of 5'06"/km or 8'12"/mi) corresponds to a time of 1h34'56" on a flat course (pace of 4'30"/km or 7'15"/mi).

Pace (min/km) Pace (min/mile) Time without slopes (hh:mm:ss) Time with slopes (hh:mm:ss) GAP (min/km) Δ Pace (min/km) GAP (min/mile) Δ Pace (min/mile)
3'00"4'50"1h03'17"1h11'43"3'24"0'24"5'28"0'39"
3'10"5'06"1h06'48"1h15'42"3'35"0'25"5'46"0'41"
3'20"5'22"1h10'19"1h19'41"3'47"0'27"6'05"0'43"
3'30"5'38"1h13'50"1h23'40"3'58"0'28"6'23"0'45"
3'40"5'54"1h17'21"1h27'39"4'09"0'29"6'41"0'47"
3'50"6'10"1h20'52"1h31'38"4'21"0'31"6'59"0'49"
4'00"6'26"1h24'23"1h35'37"4'32"0'32"7'18"0'51"
4'10"6'42"1h27'54"1h39'36"4'43"0'33"7'36"0'54"
4'20"6'58"1h31'25"1h43'35"4'55"0'35"7'54"0'56"
4'30"7'15"1h34'56"1h47'34"5'06"0'36"8'12"0'58"
4'40"7'31"1h38'27"1h51'33"5'17"0'37"8'31"0'60"
4'50"7'47"1h41'58"1h55'32"5'29"0'39"8'49"1'02"
5'00"8'03"1h45'29"1h59'31"5'40"0'40"9'07"1'04"
5'10"8'19"1h49'00"2h03'30"5'51"0'41"9'25"1'06"
5'20"8'35"1h52'31"2h07'29"6'03"0'43"9'44"1'09"
5'30"8'51"1h56'02"2h11'28"6'14"0'44"10'02"1'11"
5'40"9'07"1h59'33"2h15'27"6'25"0'45"10'20"1'13"
5'50"9'23"2h03'04"2h19'27"6'37"0'47"10'38"1'15"
6'00"9'39"2h06'35"2h23'26"6'48"0'48"10'56"1'17"
6'10"9'55"2h10'06"2h27'25"6'59"0'49"11'15"1'19"
6'20"10'12"2h13'37"2h31'24"7'11"0'51"11'33"1'21"
6'30"10'28"2h17'08"2h35'23"7'22"0'52"11'51"1'24"
6'40"10'44"2h20'39"2h39'22"7'33"0'53"12'09"1'26"
6'50"10'60"2h24'10"2h43'21"7'45"0'55"12'28"1'28"
7'00"11'16"2h27'41"2h47'20"7'56"0'56"12'46"1'30"
7'10"11'32"2h31'12"2h51'19"8'07"0'57"13'04"1'32"
7'20"11'48"2h34'43"2h55'18"8'19"0'59"13'22"1'34"
7'30"12'04"2h38'14"2h59'17"8'30"0'60"13'41"1'36"
7'40"12'20"2h41'45"3h03'16"8'41"1'01"13'59"1'38"
7'50"12'36"2h45'16"3h07'15"8'53"1'03"14'17"1'41"
8'00"12'52"2h48'47"3h11'14"9'04"1'04"14'35"1'43"

Notes on the calculation of the length of the route, on the altimetry and on the slope

Note 1: the length of the route is calculated using the geographic coordinates of the points that compose it, thanks to a specific formula. This value may differ slightly from the official length declared by the organizers of the race, which is valid in case of discrepancies.
Note 2: the altimetry may not correspond exactly to the real values. For routes obtained via Google API, it is possible that the altitude is that of the terrain, without considering the presence of any tunnels or viaducts. If, however, the route was obtained from GPS tracking (for example with sports watches), the error is arbitrary and may depend both on the GPS coverage at the time it was recorded and on the performance of the device used.
Note 3: the percentage slope is found by calculating considering sections of at least 50 meters and is subsequently subjected to a "smoothing" process to reduce the possibility of artifacts and obtain a more realistic trend. For classification purposes, roads with gradients between -3% and +3% are considered flat, those with gradients between +3% and +7% are uphill, and those with gradients greater than +7% are considered steep. The same classification applies to descents. This classification is to be considered arbitrary and is a choice of goandrace.com.