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IoT-For-Beginners/translations/zh/2-farm/lessons/1-predict-plant-growth/code-notebook/gdd.ipynb

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"source": [
"# 生长积温天数\n",
"\n",
"此笔记本加载保存在 CSV 文件中的温度数据,并进行分析。它绘制温度图,显示每天的最高和最低值,并计算 GDD。\n",
"\n",
"使用此笔记本的方法:\n",
"\n",
"* 将 `temperature.csv` 文件复制到与此笔记本相同的文件夹中\n",
"* 使用上方的 **▶︎ 运行** 按钮运行所有单元格。这将运行选定的单元格,然后移动到下一个单元格。\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"在下面的单元格中,将 `base_temperature` 设置为植物的基准温度。\n"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {},
"outputs": [],
"source": [
"base_temperature = 10"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"现在需要使用pandas加载CSV文件\n"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"import pandas as pd\n",
"import matplotlib.pyplot as plt\n",
"\n",
"# Read the temperature CSV file\n",
"df = pd.read_csv('temperature.csv')"
]
},
{
"cell_type": "markdown",
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{
"cell_type": "code",
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"plt.figure(figsize=(20, 10))\n",
"plt.plot(df['date'], df['temperature'])\n",
"plt.xticks(rotation='vertical');"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"一旦数据被读取,可以按`date`列进行分组,并提取每个日期的最低和最高温度。\n"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# Convert datetimes to pure dates so we can group by the date\n",
"df['date'] = pd.to_datetime(df['date']).dt.date\n",
"\n",
"# Group the data by date so it can be analyzed by date\n",
"data_by_date = df.groupby('date')\n",
"\n",
"# Get the minimum and maximum temperatures for each date\n",
"min_by_date = data_by_date.min()\n",
"max_by_date = data_by_date.max()\n",
"\n",
"# Join the min and max temperatures into one dataframe and flatten it\n",
"min_max_by_date = min_by_date.join(max_by_date, on='date', lsuffix='_min', rsuffix='_max')\n",
"min_max_by_date = min_max_by_date.reset_index()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"GDD可以使用标准GDD公式计算\n"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"def calculate_gdd(row):\n",
" return ((row['temperature_max'] + row['temperature_min']) / 2) - base_temperature\n",
"\n",
"# Calculate the GDD for each row\n",
"min_max_by_date['gdd'] = min_max_by_date.apply (lambda row: calculate_gdd(row), axis=1)\n",
"\n",
"# Print the results\n",
"print(min_max_by_date[['date', 'gdd']].to_string(index=False))"
]
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"cell_type": "code",
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"\n---\n\n**免责声明** \n本文档使用AI翻译服务[Co-op Translator](https://github.com/Azure/co-op-translator)进行翻译。尽管我们努力确保准确性,但请注意,自动翻译可能包含错误或不准确之处。应以原始语言的文档作为权威来源。对于关键信息,建议使用专业人工翻译。我们对因使用此翻译而引起的任何误解或误读不承担责任。\n"
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