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Rock ‘n’ Roll San Antonio Marathon 2021, course map and altimetry

Rock ‘n’ Roll San Antonio Marathon 2021: route, altimetry, gpx

Note: "Rock ‘n’ Roll San Antonio Marathon 2021" is NOT organized by goandrace.com

Rock ‘n’ Roll San Antonio Marathon 2021 course map. Lenght: 42.195 km (26.2 mi).

42.195 km (26.2 mi) course map of the event "Rock ‘n’ Roll San Antonio Marathon 2021" in San Antonio, Texas (Sunday, December 5, 2021). Explore the route!

Do you want to fly over the path with a Google Earth 3D video? Click on the following link: Rock ‘n’ Roll San Antonio Marathon 2021, 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 Rock ‘n’ Roll San Antonio Marathon 2021 event page.

Rock ‘n’ Roll San Antonio Marathon 2021: route altimetric information


Rock ‘n’ Roll San Antonio Marathon 2021: GNR-GAP index (v 1.0, experimental, see more)

Rock ‘n’ Roll San Antonio Marathon 2021: interactive route

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

Rock ‘n’ Roll San Antonio Marathon 2021: altimetry graph

Rock ‘n’ Roll San Antonio Marathon 2021: slope graph

Rock ‘n’ Roll San Antonio Marathon 2021: percentage distribution of slope

Rock ‘n’ Roll San Antonio Marathon 2021: Km by km route altimetry analysis

Lap Start Alt. End Alt. Diff. Alt. Aver. Slope Min Alt. Max Alt. Tot Climb Tot Descent
KM 0-1 198 198 +1 +0.1% 197 200 3 2
KM 1-2 198 200 +2 +0.2% 198 201 3 1
KM 2-3 200 201 +1 +0.1% 199 201 1 0
KM 3-4 201 201 0 0% 201 202 2 1
KM 4-5 201 201 -1 -0.1% 200 203 3 3
KM 5-6 201 202 +1 +0.1% 200 202 2 1
KM 6-7 202 207 +5 +0.5% 202 209 6 2
KM 7-8 207 211 +5 +0.5% 203 208 8 4
KM 8-9 211 209 -3 -0.3% 206 212 4 6
KM 9-10 209 217 +9 +0.9% 209 217 9 0
KM 10-11 217 240 +23 +2.3% 219 241 23 0
KM 11-12 240 232 -8 -0.8% 236 240 0 8
KM 12-13 232 228 -5 -0.5% 228 232 0 5
KM 13-14 228 212 -16 -1.6% 213 228 1 17
KM 14-15 212 214 +2 +0.2% 203 210 10 8
KM 15-16 214 202 -12 -1.2% 201 218 4 16
KM 16-17 202 207 +5 +0.5% 202 207 6 1
KM 17-18 207 204 -3 -0.3% 205 207 2 5
KM 18-19 204 205 +1 +0.1% 202 204 2 1
KM 19-20 205 205 +1 +0.1% 206 206 1 0
KM 20-21 205 209 +4 +0.4% 204 207 5 1
KM 21-22 209 221 +12 +1.2% 212 222 12 0
KM 22-23 221 222 +1 +0.1% 219 223 4 3
KM 23-24 222 216 -6 -0.6% 217 221 0 6
KM 24-25 216 214 -2 -0.2% 214 216 2 4
KM 25-26 214 213 -1 -0.1% 204 214 8 9
KM 26-27 213 193 -20 -2.0% 192 213 1 21
KM 27-28 193 184 -9 -0.9% 182 193 1 10
KM 28-29 184 183 0 0% 183 189 5 5
KM 29-30 183 183 0 0% 181 189 5 5
KM 30-31 183 181 -2 -0.2% 177 186 6 8
KM 31-32 181 182 +1 +0.1% 174 183 7 6
KM 32-33 182 216 +34 +3.4% 181 215 34 0
KM 33-34 216 209 -7 -0.7% 211 224 5 12
KM 34-35 209 198 -12 -1.2% 199 207 0 12
KM 35-36 198 195 -3 -0.3% 193 197 1 4
KM 36-37 195 199 +5 +0.5% 195 199 5 0
KM 37-38 199 201 +2 +0.2% 201 201 2 0
KM 38-39 201 202 +1 +0.1% 201 201 1 1
KM 39-40 202 203 +1 +0.1% 202 204 2 1
KM 40-41 203 200 -2 -0.2% 199 203 1 3
KM 41-42 200 200 -1 -0.1% 198 201 2 3
KM 42-42.20 200 199 0 0% 199 199 0 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 1.4% slower.


For example, a runner who maintains a pace of 5'00"/km (8'03"/mi) on a flat 40.4 km course, corresponding to a finish time of 3h21'59", is estimated to complete this course in 3h24'52". The recalculated average pace (GAP) improves to 5'04"/km (8'10"/mi), making it 0'04"/km (0'07"/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 8'/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 3h08'31", the estimate is to complete this course in 3h11'12", corresponding to a pace of 4'44"/km (or 7'37"/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 3h04'22" (pace of 4'34"/km or 7'21"/mi) corresponds to a time of 3h01'47" 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"2h01'11"2h02'55"3'03"0'03"4'54"0'04"
3'10"5'06"2h07'55"2h09'45"3'13"0'03"5'10"0'04"
3'20"5'22"2h14'39"2h16'34"3'23"0'03"5'26"0'05"
3'30"5'38"2h21'23"2h23'24"3'33"0'03"5'43"0'05"
3'40"5'54"2h28'07"2h30'14"3'43"0'03"5'59"0'05"
3'50"6'10"2h34'51"2h37'03"3'53"0'03"6'15"0'05"
4'00"6'26"2h41'35"2h43'53"4'03"0'03"6'32"0'05"
4'10"6'42"2h48'19"2h50'43"4'14"0'04"6'48"0'06"
4'20"6'58"2h55'03"2h57'33"4'24"0'04"7'04"0'06"
4'30"7'15"3h01'47"3h04'22"4'34"0'04"7'21"0'06"
4'40"7'31"3h08'31"3h11'12"4'44"0'04"7'37"0'06"
4'50"7'47"3h15'15"3h18'02"4'54"0'04"7'53"0'07"
5'00"8'03"3h21'59"3h24'52"5'04"0'04"8'10"0'07"
5'10"8'19"3h28'43"3h31'41"5'14"0'04"8'26"0'07"
5'20"8'35"3h35'27"3h38'31"5'25"0'05"8'42"0'07"
5'30"8'51"3h42'11"3h45'21"5'35"0'05"8'59"0'08"
5'40"9'07"3h48'55"3h52'11"5'45"0'05"9'15"0'08"
5'50"9'23"3h55'39"3h59'00"5'55"0'05"9'31"0'08"
6'00"9'39"4h02'23"4h05'50"6'05"0'05"9'48"0'08"
6'10"9'55"4h09'07"4h12'40"6'15"0'05"10'04"0'08"
6'20"10'12"4h15'51"4h19'30"6'25"0'05"10'20"0'09"
6'30"10'28"4h22'35"4h26'19"6'36"0'06"10'37"0'09"
6'40"10'44"4h29'19"4h33'09"6'46"0'06"10'53"0'09"
6'50"10'60"4h36'03"4h39'59"6'56"0'06"11'09"0'09"
7'00"11'16"4h42'47"4h46'49"7'06"0'06"11'26"0'10"
7'10"11'32"4h49'31"4h53'38"7'16"0'06"11'42"0'10"
7'20"11'48"4h56'15"5h00'28"7'26"0'06"11'58"0'10"
7'30"12'04"5h02'59"5h07'18"7'36"0'06"12'15"0'10"
7'40"12'20"5h09'43"5h14'07"7'47"0'07"12'31"0'11"
7'50"12'36"5h16'27"5h20'57"7'57"0'07"12'47"0'11"
8'00"12'52"5h23'11"5h27'47"8'07"0'07"13'03"0'11"

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.