kurt-hectic https://api.github.com/users/kurt-hectic Cultivated area with regular cover of low crops, or moderately open country with occasional obstacles (e.g. low hedges, single rows of trees, isolated farms) at relative horizontal distances of at least 20 obstacle heights. (zo 0.10) Roughly open (Low crops; occasional large obstacles, x/H > 20) roughlyOpen Roughly open (Low crops; occasional large obstacles, x/H > 20) 2020-04-29T14:25:43.565Z Featureless land surface without any noticeable obstacles and with negligible vegetation; e.g. beaches, pack ice without large ridges, morass, and snow-covered or fallow open country. (zo 0.005) Smooth (Mud flats, snow; no vegetation, no obstacles) smooth Open sea or lake (irrespective of the wave size), tidal flat, snow-covered flat plain, featureless desert, tarmac and concrete, with a free fetch of several kilometers. (zo 0.0002) Sea (open water, tidal flat, snow with fetch above 3 km sea The surface roughness is unknown. unknown unknown Landscape totally and quite regularly covered with similar size large obstacles, with open spaces comparable to the obstacle heights; e.g. mature regular forests, homogeneous cities or villages. (zo 1.0) Closed (Regular large obstacle COVER (suburb, forest)) closed Recently-developed 'young' landscape with high crops or crops of varying height, and scattered obstacles (e.g. dense shelterbelts, vineyards) at relative distances of about 15 obstacle heights. (zo 0.25) Rough (High crops; scattered obstacles, 15 < x/H < 20) rough None of the codes in the table are applicable in the context of this particular observation inapplicable inapplicable Centres of large towns with mixture of low-rise and high-rise buildings. Also irregular large forests with many clearings. (zo ≥ 2) Chaotic (City centre with high and low-rise buildings) chaotic 2 Surface roughness (Davenport roughness classification) 2019-11-21T09:21:32.061Z Level country with low vegetation (e.g. grass) and isolated obstacles with separations of at least 50 obstacle heights; e.g. grazing land without windbreaks, heather, moor and tundra, runway area of airports. (zo 0.03) Open (Open flat terrain; grass, few isolated obstacles) open Surface roughness (Davenport roughness classification) 'Old' cultivated landscape with many rather large obstacle groups (large farms, clumps of forest) separated by open spaces of about 10 obstacle heights. Also low large vegetation with small interspaces, such as bushland, orchards, young densely-planted forest. (zo 0.5) Very rough (Parkland, bushes; numerous obstacles, x/H ~ 10) veryRough 2019-10-14T16:36:36.986Z roughlyOpen Cultivated area with regular cover of low crops, or moderately open country with occasional obstacles (e.g. low hedges, single rows of trees, isolated farms) at relative horizontal distances of at least 20 obstacle heights. (zo 0.10) 3 2020-04-29T14:26:21.352Z 2020-04-29T14:36:17.868Z SurfaceRoughnessDavenport kurt-hectic https://api.github.com/users/kurt-hectic 3 2019-10-14T16:36:36.979Z 2019-11-21T09:21:32.061Z Surface roughness (Davenport roughness classification) Surface roughness (Davenport roughness classification) Level country with low vegetation (e.g. grass) and isolated obstacles with separations of at least 50 obstacle heights; e.g. grazing land without windbreaks, heather, moor and tundra, runway area of airports. (zo 0.03) Open (Open flat terrain; grass, few isolated obstacles) 3 2020-04-29T14:25:43.564Z kurt-hectic https://api.github.com/users/kurt-hectic 2020-04-29T14:26:21.35Z 2019-10-14T16:36:36.988Z open Chaotic (City centre with high and low-rise buildings) 2020-04-29T14:25:43.561Z Centres of large towns with mixture of low-rise and high-rise buildings. Also irregular large forests with many clearings. (zo ≥ 2) 2020-04-29T14:26:21.347Z kurt-hectic https://api.github.com/users/kurt-hectic 2020-11-19T12:50:31.881Z chaotic 4 2019-10-14T16:36:36.987Z kurt-hectic https://api.github.com/users/kurt-hectic Landscape totally and quite regularly covered with similar size large obstacles, with open spaces comparable to the obstacle heights; e.g. mature regular forests, homogeneous cities or villages. (zo 1.0) 2019-10-14T16:36:36.983Z 3 2020-04-29T14:26:21.348Z 2020-04-29T14:25:43.562Z Closed (Regular large obstacle COVER (suburb, forest)) closed 2019-10-14T16:36:36.985Z 2020-04-29T14:25:43.563Z 2020-04-29T14:26:21.349Z 3 inapplicable kurt-hectic https://api.github.com/users/kurt-hectic None of the codes in the table are applicable in the context of this particular observation inapplicable Very rough (Parkland, bushes; numerous obstacles, x/H ~ 10) 3 2020-04-29T14:25:43.567Z kurt-hectic https://api.github.com/users/kurt-hectic 2019-10-14T16:36:36.99Z veryRough 2020-04-29T14:26:21.355Z 'Old' cultivated landscape with many rather large obstacle groups (large farms, clumps of forest) separated by open spaces of about 10 obstacle heights. Also low large vegetation with small interspaces, such as bushland, orchards, young densely-planted forest. (zo 0.5) unknown kurt-hectic https://api.github.com/users/kurt-hectic 3 2020-04-29T14:26:21.354Z 2020-04-29T14:25:43.567Z 2019-10-14T16:36:36.983Z unknown The surface roughness is unknown. Featureless land surface without any noticeable obstacles and with negligible vegetation; e.g. beaches, pack ice without large ridges, morass, and snow-covered or fallow open country. (zo 0.005) 2020-04-29T14:25:43.566Z 2020-04-29T14:26:21.353Z kurt-hectic https://api.github.com/users/kurt-hectic Smooth (Mud flats, snow; no vegetation, no obstacles) smooth 3 2019-10-14T16:36:36.981Z 2020-04-29T14:26:21.352Z 3 Open sea or lake (irrespective of the wave size), tidal flat, snow-covered flat plain, featureless desert, tarmac and concrete, with a free fetch of several kilometers. (zo 0.0002) Sea (open water, tidal flat, snow with fetch above 3 km sea kurt-hectic https://api.github.com/users/kurt-hectic 2019-10-14T16:36:36.982Z 2020-04-29T14:25:43.565Z 2019-10-14T16:36:36.984Z Rough (High crops; scattered obstacles, 15 < x/H < 20) 3 rough kurt-hectic https://api.github.com/users/kurt-hectic Recently-developed 'young' landscape with high crops or crops of varying height, and scattered obstacles (e.g. dense shelterbelts, vineyards) at relative distances of about 15 obstacle heights. (zo 0.25) 2020-04-29T14:26:21.351Z 2020-04-29T14:25:43.564Z