Home > Thematic description of CGMS level 1 > Alternative entry for grid weather data

• Introduction
• Thematic description of CGMS level 1
• Goals and assumptions
• Acquisition, checks and processing daily station data
• Spatial Interpolation to regular climatic grid
• Alternative entry for grid weather data
• Thematic description of CGMS level 2
• Additional functionality in the CGMS software for yield forecast
• Overview of different CGMS versions
• CGMS 9.2 database
• CGMS User Interface
• References
• Annex A Using CGMS in batch mode
• Contacts
• Legal Notice

Thematic description of CGMS level 1

Alternative entry for grid weather data

CGMS has the possibility to enter grid weather through other tables than table GRID_WEATHER. The table GRID_WEATHER_MODEL_1, GRID_WEATHER_MODEL_10 and GRID_WEATHER_MODEL_30 store respectively model weather with a time step of a day, ten days or a month. Only mean temperature is extra and the 10-daily and monthly tables have a different date field. Because the crop growth model WOFOST in CGMS does need daily weather data, it is necessary to convert 10-daily and monthly data into daily values. Variables like temperature, given on a monthly or dekad basis, are simply interpolated to obtain daily values. A table RAINY_DAYS has been introduced which stores long term average rainy days per dekad and climatic grid cell. The rainy days are necessary to calculate daily rainfall by distributing the given monthly or dekadal rainfall over these rainy days.