Heat Module benchmarks
The DPRA Heat stress report includes reference information on the city of Wageningen on 02-08-2013. It is deemed relevant to the report because it can be related to actual measurements made for the city of Wageningen. The PET measurements for this exceptionally hot day are comparable to the default 01-07-2015 reference case for Wageningen.
The performed benchmark has an average difference below 0.68% for the selected measurement points.
Results
The PET Benchmark result overlays can be seen below:
Point Measurement Analysis
Several points have been compared for results. These points across the map have been selected based on fact that their spatial situation (i.e. input data like foliage and vegetation fraction) is similar for both the Wageningen calculated PET and Tygron generated PET.
| id | Wageningen PET | Tygron PET | Difference (%) |
|---|---|---|---|
| 01 | 46.12 | 46.13 | 0.022 |
| 02 | 47.44 | 48.04 | 1.26 |
| 03 | 47.11 | 47.52 | 0.87 |
| 04 | 44.70 | 44.99 | 0.65 |
| 05 | 40.53 | 40.48 | -0.12 |
| 06 | 38.69 | 38.67 | -0.05 |
| 07 | 42.52 | 42.45 | -0.16 |
| 08 | 44.87 | 44.03 | -1.87 |
| 09 | 43.62 | 43.02 | -1.38 |
| 10 | 46.79 | 46.58 | -0.45 |
| 11 | 38.70 | 38.79 | 0.23 |
| 12 | 44.40 | 44.00 | -0.90 |
| 13 | 46.34 | 46.29 | -0.11 |
| 14 | 45.58 | 45.77 | 0.42 |
| 15 | 39.05 | 39.42 | 0.95 |
| 16 | 38.22 | 38.28 | 0.16 |
| 17 | 43.23 | 43.88 | 1.50 |
| 18 | 46.34 | 46.49 | 0.32 |
| 19 | 45.59 | 44.84 | -1.65 |
| 20 | 46.21 | 45.96 | -0.54 |
| Average | 0.68 |
So on average for points that in both cases have a similar spatial situation the difference in calculated PET is 0.68%.
Setup
Weather data from weatherstation Herwijnen has been used for this test case. The used values are:
| Variable | Value |
|---|---|
| Date | 02-08-2013 |
| Hour of day | 14 |
| Sun altitude | 55.5 |
| Sun azimuth | 186.9 |
| Sun daily motion factor | 0.063 |
| Humidity (%) | 56 |
| Sun radiation (W/m2) | 774 |
| Temperature (°C) | 31.7 |
| Wind speed (m/s) | 4 |
| Wind direction (°) | 140 |
| Daily min. temperature (°C) | 18.9 |
| Daily max. temperature (°C) | 34.1 |
| Daily avg. radiation (W/m2) | 455 |
| Daily avg. wind speed | 3.17 |
The foliage height will be defined by a Geotiff. See the images (overview and zoomed in east-south-east corner) below:
Calculation time
The calculation time of the PET overlay of 1 timeframe on a 1x1 meter grid for a 4x4km area of Wageningen is approximately 5 seconds.
See also
- How to import KNMI weather data into Microsoft Excel
- For a more in depth variance analysis, see analysis;
