【发布时间】:2017-12-06 23:37:14
【问题描述】:
目标
- 将 GIS、shapefile(县界)上传到底图
- 使用底图绘制县界
- 确定某个位置是否在边界内
- 为点分配权重,具体取决于它们所在的边界
- 使用 DBSCAN 根据坐标和权重发现聚类中心
方法
使用this tutorial on Basemap,上传shapefile进行映射。
#First, we have to import our datasets.
#These datasets include store locations, existing distribution locations, county borders, and real estate by county
walmartStores = pd.read_csv("data/walmart-stores.csv",header=0, encoding='latin1')
propertyValues = pd.read_csv("data/property values.csv")
shp = fiona.open('data/boundaries/Counties.shp')
#We need to create a workable array with Walmart Stores
longitude = walmartStores.longitude
latitude = walmartStores.latitude
stores = np.column_stack((longitude, latitude))
#We also need to load the shape file for county boundaries
extra = 0.1
bds = shp.bounds
shp.close()
#We need to assign the lower-left bound and upper-right bound
ll = (bds[0], bds[1])
ur = (bds[2], bds[3])
#concatenate the lower left and upper right into a variable called coordinates
coords = list(chain(ll, ur))
print(coords)
#define variables for the width and the height of the map
w, h = coords[2] - coords[0], coords[3] - coords[1]
print(coords) = [105571.4206781257, 4480951.235680977, 779932.0626624253, 4985476.422250552]
到目前为止一切都很好,但是我遇到了以下问题:
m = Basemap(
#set projection to 'tmerc' to minimize map distortion
projection='tmerc',
#set longitude as average of lower, upper longitude bounds
lon_0 = np.average([bds[0],bds[2]]),
#set latitude as average of lower,upper latitude bounds
lat_0 = np.average([bds[1],bds[3]]),
#string describing ellipsoid (‘GRS80’ or ‘WGS84’, for example).
#Not sure what this does...
ellps = 'WGS84',
#set the map boundaries. Note that we use the extra variable to provide a 10% buffer around the map
llcrnrlon=coords[0] - extra * w,
llcrnrlat=coords[1] - extra + 0.01 * h,
urcrnrlon=coords[2] + extra * w,
urcrnrlat=coords[3] + extra + 0.01 * h,
#provide latitude of 'true scale.'
#check the Basemap API
lat_ts=0,
#resolution of boundary database to use. Can be c (crude), l (low), i (intermediate), h (high), f (full) or None.
resolution='i',
#don't show the axis ticks automatically
suppress_ticks = False)
m.readshapefile(
#provide the path to the shapefile, but leave off the .shp extension
'data/boundaries/Counties.shp',
#name your map something useful (I named this 'srilanka')
'nyCounties',
#set the default shape boundary coloring (default is black) and the zorder (layer order)
color='none',
zorder=2)
错误:lat_0 必须介于 -90.000000 和 90.000000 之间
问题
- lat_0 和 lon_0 不在 -90 和 90 之间。但是,lon_0 不会引发错误。为什么会这样?
- 我已经在网上寻找其他面临类似问题的人,但都空手而归。我的笔记本有什么独特之处吗? (注意:
conda list显示 `basemap 1.0.7,所以我知道它已安装并正在运行)
谢谢!
【问题讨论】: