Fre*_*ial 5 gis geometry r qgis r-sf
我有飓风轨迹点,我将其转换为 QGIS 中的线:
https://i.stack.imgur.com/Gtt61.png
https://i.stack.imgur.com/6z8MO.png
我已将两者保存为 shapefile 并使用sf包将它们加载到 R 中。点将使用标准plot()函数绘制,但线不会。
我遇到了错误:
plot(hurricane_paths)
Error in CPL_geos_is_empty(st_geometry(x)) :
Evaluation error: IllegalArgumentException: point array must contain 0 or >1 elements.
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我使用时也出现同样的错误plot(st_geometry(hurricane_paths))
不过,R 肯定会加载到几何中:
> hurricane_paths
Simple feature collection with 1410 features and 5 fields
geometry type: LINESTRING
dimension: XY
bbox: xmin: -179.9 ymin: -4.9 xmax: 8 ymax: 70.7
epsg (SRID): 4269
proj4string: +proj=longlat +datum=NAD83 +no_defs
First 10 features:
N.A begin end Year N.A_1 geometry
1 1976143N24271 <NA> <NA> 1976 SUBTROP:UNNAMED LINESTRING (-89 24, -89.6 2...
2 1976155N11265 <NA> <NA> 1976 ANNETTE LINESTRING (-95 11.4, -95.2...
3 1976159N27281 <NA> <NA> 1976 UNNAMED LINESTRING (-79 26.8, -78.5...
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并st_geometry(hurricane_paths)返回
Geometry set for 1410 features
geometry type: LINESTRING
dimension: XY
bbox: xmin: -179.9 ymin: -4.9 xmax: 8 ymax: 70.7
epsg (SRID): 4269
proj4string: +proj=longlat +datum=NAD83 +no_defs
First 5 geometries:
LINESTRING (-89 24, -89.6 24.8, -90 25.4, -90.5...
LINESTRING (-95 11.4, -95.2 11.7, -95.3 12.1, -...
LINESTRING (-79 26.8, -78.5 28, -78.1 29.2, -77...
LINESTRING (-81 26.5, -78.5 28.2, -76.2 30, -73...
LINESTRING (-103 16, -104.1 15.8, -105.1 15.8, ...
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我已经在几何列中检查了 NA:
> which(is.na(hurricane_paths$geometry)==T)
integer(0)
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plot_sf()不返回任何错误消息,但它在绘图窗格中返回一个空白屏幕,因此这也是不行的。
但 ggplot2 很棒,并且返回图形,没问题:
> ggplot() +
+ geom_sf(data = hurricane_paths)
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Mapview 也很好:> mapview::mapview(hurricane_paths)
但基本plot()功能仍然顽固。问题可能是什么?
我遇到了和你一样的问题,问题似乎出在从点到线串的转换上。按照线程Create Multilines from Points, grouped by ID with sf package中找到的解决方案,您可能必须使用
summarise(do_union = FALSE) %>%
st_cast("LINESTRING")
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在将点数据集转换为线串之前。
我希望它有帮助。