coop

2012-07-20

FEWS_Taiwan工作日誌 2012.07.20

1.高屏溪流域與蘭陽溪流域流量系集預報確認完成
2.克利金法空間內插使用之集水區代表點需要重新確認是否更新到多邊形形心中心
3.六河局曾文水庫降雨量推估工作更新 1630P065;三角南山 1630P063;表湖測站資料來源
4.四河局濁水溪流域新增 1510H083南雲大橋

國立臺北科技大學土木工程系

2012-07-10

QGIS Field Calculator Functions

在QGIS中提供幾個在GIS常用的查詢語法來計算圖形資料數值

如面積、週長、長度與點位的x y坐標值

$area - area of polygon

$perimeter - perimeter of polygon

$length - length of line

$x - x coordinate of point

$y - y coordinate of point

更完整的資料請參考網址
http://hub.qgis.org/wiki/17/List_of_Field_Calculator_Functions

2012-07-01

Real-time updating and data assimilation information

http://www.nws.noaa.gov/oh/rfcdev/projects/rfcHMET_docs.html
DHI Comments
"Real-time updating or data assimilation are not mentioned in the
questionnaire or the general comments of the report. It has been our
experience that this process of correcting the forecast in real-time is
vital to achieving accurate and reliable information to use for making
critical decisions on flood warnings vs. flood alerts. Neither HEC-RAS
nor FLDWAV have the capability of performing this type of treatment on
the simulated data.
If you do come across a situation where you are evaluating the
performance of the flood forecasting systems and it appears that they
are not producing representative forecasts of water levels or flows,
then it may be something that could be resolved using the data
assimilation techniques available with the MIKE 11 system."

FEWS_Taiwan 相關國外參考文獻資料

在美國 NWS EVALUATION OF DIFFERENT HYDRAULIC MODELS IN SUPPORT OF
NATIONAL WEATHER SERVICE OPERATIONS （2007）評估報告中

提到 Flood Early Warning System (Delft-FEWS) that provides flood
forecasting and warning systems customized to the specific
requirements of an

individual flood forecasting agency. Some of the current Delft-FEWS
applications are in Germany, Taiwan, Vietnam, Thailand and Singapore.