Fire risk values, analysed

In the decision support system Fire Risk Forest and Land, fire risk forecasts are calculated and meteorological data are reported to support decisions on fire in vegetation. Once the forecast has ended, a new calculation of the fire risk values is made based on the latest available weather data. This “analysis data” is stored. After each year’s fire season, the analysed historical data set of the model-calculated boxes of 11*11 km is saved with the midpoint given in x and y coordinates. Please note that the WMS service only contains the previous year’s data. Each 11*11 km square has the attributes listed below (some variation may occur from year to year): ID: Internal MSB Task Puncture: Internal MSB task for unique grid box. The data was added in 2015, before there was no value. Time: It was used until 2014 to indicate the date of statistical values. As of 2015, dates will be stored in the “Date” field. Temp: Temperature in degrees Celsius 2 m above ground at 12 UTC according to the calculation model for the current grid. RH: Relative humidity expressed in % 2 m above the ground at 12 UTC according to the calculation model for the current grid grid. Wind speed: Wind speed in m/s (medium wind) 10 m above the ground at 12 UTC according to the calculation model for the current grid pane. Downstairs: Precipitation current day 18 UTC-18 UTC the previous day according to the calculation model for the current grid grid. FFMC: Fine Fuel Moisture Code represents the humidity of leaves and grass. The maximum water storage in this layer is less than 1 mm. Included in the FWI model. DMC: The Duff Moisture Code represents the humidity in a slightly deeper layer than the most superficial in the FWI model, e.g. moss and the superficial soil layer. The storage in this layer corresponds to about 15 mm of water. DC: The Drought Code shows the moisture content of thick compact humus layers (about 100 mm water). DC is part of the FWI model. ISI: The initial spread index. A measure of the rate of spread of the fire. An index used to calculate an FWI. Calculated from FFMC and reinforced by wind speed. BUI: Buildup index. Can be seen as a general measure of humidity for the slightly deeper soil layers. An index value used to calculate a fire risk value, FWI. Weighted average of DMC and DC. FWI: Fire Weather Index. Fire risk value calculated from ISI and BUI, which in turn are based on three basic values for moisture content in different layers (FFMC, DMC and DC). The input to the calculation is the daily rainfall as well as temperature, relative humidity and wind speed in the middle of the day. FWI index: Index of spread risk and fire behaviour in forest land. Based on the basic value FWI (see above). Currently divided into six different index levels (1, 2, 3, 4, 5, 5E) where index 1 is the lowest risk and index 5E is the highest risk. Medium: Daily average temperature 2 m above ground according to SMHI calculation model for the current grid grid. HBV: Weighted soil moisture value based on the moisture in two soil layers calculated with HBV-Skog, which is a special adaptation of the hydrological runoff model HBV (Hydrological Agency’s Water Balance Department). The input to the model is daily rainfall and daily average temperature. HBV-ö: HBV upper ground layer (see HBV above) HBV-u: HBV lower ground layer (see HBV above) Gras: Fire risk levels for grass fires, the following indications are used: Snow — Snow-covered land Small — Small/moderate grass fire hazard Big — Big grass fire hazard Li A — Small/moderate grass fire hazard and declining grass fire season St A — Big grass fire hazard and declining grass fire season End of the Grass Fire Season Wind direction: Wind direction in degrees from where the wind comes from (division 360 degrees, 180 degrees equivalent to southern wind) at 12 UTC according to the calculation model for the current grid pane. E: The east-west position (centre) of the grid pane specified in SWEREF 99 TM. NOTE: prior to 2015, this information was entered in box ‘y’. N: The north-south position of the grid (centre point) specified in SWEREF99 TM. NOTE: prior to 2015, this information was entered in box “x”. Municipality: The commune code of the municipality within which the coordinate in the fields “E” and “N” is located.在森林土地火灾风险决策支持系统（Fire Risk Forest and Land）中，系统会计算火灾风险预报并上报气象数据，以支撑植被火灾相关决策制定。当单次预报结束后，系统将基于最新可用气象数据重新计算火灾风险值，并将该"分析数据"进行存储。每年火灾季结束后，系统会保存模型计算得到的11*11公里网格的历史分析数据集，其中心点以x、y坐标标注。请注意，WMS服务仅包含上一年度的数据集。 每个11*11公里的网格单元具备以下属性（各年度的属性可能存在细微差异）： ID：MSB内部任务编号 Puncture：用于唯一标识网格单元的MSB内部任务项。该数据自2015年起加入，此前无对应数值。 Time：该字段用于2014年及之前的统计值日期标注，自2015年起，日期信息将存储于"Date"字段中。 Temp：当前网格计算模型下，世界协调时12点、离地2米处的气温，单位为摄氏度。 RH：当前网格计算模型下，世界协调时12点、离地2米处的相对湿度，单位为百分比。 Wind speed：当前网格计算模型下，世界协调时12点、离地10米处的风速，单位为米/秒（代表中等风速）。 Downstairs：当前网格计算模型下，当日18时至前日18时的降水量。 FFMC（细可燃物湿度码，Fine Fuel Moisture Code）：表征叶片与草本植物的湿度，该层最大蓄水量小于1毫米，为FWI系统的组成部分。 DMC（腐殖质湿度码，Duff Moisture Code）：表征FWI模型中除最表层外稍深层的湿度，例如苔藓与浅层土壤，该层蓄水量约相当于15毫米降水量。 DC（干旱码，Drought Code）：表征紧实厚层腐殖质的含水量（约相当于100毫米降水量），为FWI系统的组成部分。 ISI（初始蔓延指数，Initial Spread Index）：用于衡量火灾蔓延速率的指标，是FWI值的计算依据之一，由FFMC推导得出并受风速影响修正。 BUI（蓄积指数，Buildup Index）：可视为稍深层土壤湿度的综合衡量指标，是FWI火灾风险值的计算依据之一，为DMC与DC的加权平均值。 FWI（火灾天气指数，Fire Weather Index）：由ISI与BUI计算得到的火灾风险值，而ISI与BUI又基于不同土层湿度的三个基础指标（FFMC、DMC与DC）推导得出。该计算的输入数据为当日降水量，以及当日正午的气温、相对湿度与风速。 FWI指数：表征林地火灾蔓延风险与火灾行为的指标，基于前述基础FWI值构建。目前该指数分为6个等级（1、2、3、4、5、5E），其中等级1代表最低风险，5E代表最高风险。 Medium：当前网格基于SMHI计算模型得到的、离地2米处的日平均气温。 HBV：基于HBV-Skog模型计算得到的两层土壤加权含水量。HBV-Skog是水文径流模型HBV（由水文署水量平衡部开发）的林地专用适配版本，该模型的输入数据为日降水量与日平均气温。 HBV-ö：HBV模型的地表上层含水量（详见前述HBV说明）。 HBV-u：HBV模型的地表下层含水量（详见前述HBV说明）。 Gras：草地火灾风险等级，采用以下标识： Snow：积雪覆盖区域 Small：轻度/中度草地火灾风险 Big：重度草地火灾风险 Li A：轻度/中度草地火灾风险，且草地防火季进入衰减阶段 St A：重度草地火灾风险，且草地防火季进入衰减阶段 End of the Grass Fire Season：草地防火季结束 Wind direction：当前网格计算模型下，世界协调时12点的风向，单位为度（风向以风的来向计量，360度全量程，180度对应南风）。 E：以SWEREF 99 TM坐标系标注的网格单元中心点东西向坐标。注意：2015年之前，该信息曾存储于"y"字段中。 N：以SWEREF99 TM坐标系标注的网格单元中心点南北向坐标。注意：2015年之前，该信息曾存储于"x"字段中。 Municipality：字段"E"与"N"所标注坐标所在的市镇代码。