{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# 森林火灾模拟" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "之前我们已经构建好了一些基础,但是还没有开始对火灾进行模拟。" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 随机生长" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "- 在原来的基础上,我们要先让树生长,即定义 `grow_trees()` 方法\n", "- 定义方法之前,我们要先指定两个属性:\n", " - 每个位置随机生长出树木的概率\n", " - 每个位置随机被闪电击中的概率\n", "- 为了方便,我们定义一个辅助函数来生成随机 `bool` 矩阵,大小与森林大小一致\n", "- 按照给定的生长概率生成生长的位置,将 `trees` 中相应位置设为 `True`" ] }, { "cell_type": "code", "execution_count": 1, "metadata": { "collapsed": true }, "outputs": [], "source": [ "import numpy as np\n", "\n", "class Forest(object):\n", " \"\"\" Forest can grow trees which eventually die.\"\"\"\n", " def __init__(self, size=(150,150), p_sapling=0.0025, p_lightning=5.0e-6):\n", " self.size = size\n", " self.trees = np.zeros(self.size, dtype=bool)\n", " self.fires = np.zeros((self.size), dtype=bool)\n", " self.p_sapling = p_sapling\n", " self.p_lightning = p_lightning\n", " \n", " def __repr__(self):\n", " my_repr = \"{}(size={})\".format(self.__class__.__name__, self.size)\n", " return my_repr\n", " \n", " def __str__(self):\n", " return self.__class__.__name__\n", " \n", " @property\n", " def num_cells(self):\n", " \"\"\"Number of cells available for growing trees\"\"\"\n", " return np.prod(self.size)\n", " \n", " @property\n", " def tree_fraction(self):\n", " \"\"\"\n", " Fraction of trees\n", " \"\"\"\n", " num_trees = self.trees.sum()\n", " return float(num_trees) / self.num_cells\n", " \n", " @property\n", " def fire_fraction(self):\n", " \"\"\"\n", " Fraction of fires\n", " \"\"\"\n", " num_fires = self.fires.sum()\n", " return float(num_fires) / self.num_cells\n", " \n", " def _rand_bool(self, p):\n", " \"\"\"\n", " Random boolean distributed according to p, less than p will be True\n", " \"\"\"\n", " return np.random.uniform(size=self.trees.shape) < p\n", " \n", " def grow_trees(self):\n", " \"\"\"\n", " Growing trees.\n", " \"\"\"\n", " growth_sites = self._rand_bool(self.p_sapling)\n", " self.trees[growth_sites] = True" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "测试:" ] }, { "cell_type": "code", "execution_count": 2, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "0.0\n", "0.00293333333333\n" ] } ], "source": [ "forest = Forest()\n", "print forest.tree_fraction\n", "\n", "forest.grow_trees()\n", "print forest.tree_fraction" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 火灾模拟" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "- 定义 `start_fires()`:\n", " - 按照给定的概率生成被闪电击中的位置\n", " - 如果闪电击中的位置有树,那么将其设为着火点\n", "- 定义 `burn_trees()`:\n", " - 如果一棵树的上下左右有火,那么这棵树也会着火\n", "- 定义 `advance_one_step()`:\n", " - 进行一次生长,起火,燃烧" ] }, { "cell_type": "code", "execution_count": 3, "metadata": { "collapsed": true }, "outputs": [], "source": [ "import numpy as np\n", "\n", "class Forest(object):\n", " \"\"\" Forest can grow trees which eventually die.\"\"\"\n", " def __init__(self, size=(150,150), p_sapling=0.0025, p_lightning=5.0e-6):\n", " self.size = size\n", " self.trees = np.zeros(self.size, dtype=bool)\n", " self.fires = np.zeros((self.size), dtype=bool)\n", " self.p_sapling = p_sapling\n", " self.p_lightning = p_lightning\n", " \n", " def __repr__(self):\n", " my_repr = \"{}(size={})\".format(self.__class__.__name__, self.size)\n", " return my_repr\n", " \n", " def __str__(self):\n", " return self.__class__.__name__\n", " \n", " @property\n", " def num_cells(self):\n", " \"\"\"Number of cells available for growing trees\"\"\"\n", " return np.prod(self.size)\n", " \n", " @property\n", " def tree_fraction(self):\n", " \"\"\"\n", " Fraction of trees\n", " \"\"\"\n", " num_trees = self.trees.sum()\n", " return float(num_trees) / self.num_cells\n", " \n", " @property\n", " def fire_fraction(self):\n", " \"\"\"\n", " Fraction of fires\n", " \"\"\"\n", " num_fires = self.fires.sum()\n", " return float(num_fires) / self.num_cells\n", " \n", " def _rand_bool(self, p):\n", " \"\"\"\n", " Random boolean distributed according to p, less than p will be True\n", " \"\"\"\n", " return np.random.uniform(size=self.trees.shape) < p\n", " \n", " def grow_trees(self):\n", " \"\"\"\n", " Growing trees.\n", " \"\"\"\n", " growth_sites = self._rand_bool(self.p_sapling)\n", " self.trees[growth_sites] = True\n", " \n", " def start_fires(self):\n", " \"\"\"\n", " Start of fire.\n", " \"\"\"\n", " lightning_strikes = (self._rand_bool(self.p_lightning) & \n", " self.trees)\n", " self.fires[lightning_strikes] = True\n", " \n", " def burn_trees(self):\n", " \"\"\"\n", " Burn trees.\n", " \"\"\"\n", " fires = np.zeros((self.size[0] + 2, self.size[1] + 2), dtype=bool)\n", " fires[1:-1, 1:-1] = self.fires\n", " north = fires[:-2, 1:-1]\n", " south = fires[2:, 1:-1]\n", " east = fires[1:-1, :-2]\n", " west = fires[1:-1, 2:]\n", " new_fires = (north | south | east | west) & self.trees\n", " self.trees[self.fires] = False\n", " self.fires = new_fires\n", " \n", " def advance_one_step(self):\n", " \"\"\"\n", " Advance one step\n", " \"\"\"\n", " self.grow_trees()\n", " self.start_fires()\n", " self.burn_trees()" ] }, { "cell_type": "code", "execution_count": 4, "metadata": { "collapsed": false }, "outputs": [], "source": [ "forest = Forest()\n", "\n", "for i in range(100):\n", " forest.advance_one_step()" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "使用 `matshow()` 显示树木图像:" ] }, { "cell_type": "code", "execution_count": 5, "metadata": { "collapsed": false }, "outputs": [ { "data": { "image/png": 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"text/plain": [ "" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "import matplotlib.pyplot as plt\n", "from matplotlib import cm\n", "\n", "%matplotlib inline\n", "\n", "plt.matshow(forest.trees, cmap=cm.Greens)\n", "\n", "plt.show()" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "查看不同着火概率下的森林覆盖率趋势变化:" ] }, { "cell_type": "code", "execution_count": 6, "metadata": { "collapsed": false }, "outputs": [ { "data": { "image/png": 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TvdjHxwOtWikzrZejyCUOu3drYzyB1GJ/+jQPnVVryLwt5Po9jW5IrSKX2MfE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\nACVnJZcfS1FJEf0S90v5Q6C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X7BH7vXv5w9tb2QmJZMNey96d/PUAF/ShQytOORgZqb8x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\nRU5ErkJggg==\n", "text/plain": [ "" ] }, "metadata": {}, "output_type": "display_data" } ], "source": [ "forest = Forest()\n", "forest2 = Forest(p_lightning=5e-4)\n", "\n", "tree_fractions = []\n", "\n", "for i in range(2500):\n", " forest.advance_one_step()\n", " forest2.advance_one_step()\n", " tree_fractions.append((forest.tree_fraction, forest2.tree_fraction))\n", "\n", "plt.plot(tree_fractions)\n", "\n", "plt.show()" ] } ], "metadata": { "kernelspec": { "display_name": "Python 2", "language": "python", "name": "python2" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 2 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython2", "version": "2.7.10" } }, "nbformat": 4, "nbformat_minor": 0 }