cont.elev.sp <- extract(elevation, cont, fun=function(x,...){length(x)}, sp = TRUE) extract()函数也可以应用于点状和线状矢量对象。但是,如果你所使用的分区图层是栅格对象而非矢量对象时,请使用zonal()函数。
Extract values from raster time series PURPOSE:To precisely extract a target by binarizing a raster scan input video signal by contrast, setting a grating type gate in an area including the target for the binary image, and detecting the shape of the target. CONSTITUTION:The r... B Naimi 被...
下面是Elia的示例和qdread使用terra包和microbenchmark评估的答案。第二个选项几乎快三倍：...
1、为了返回多个返回值，只需在return关键字后跟多个值(依次用逗号分隔)。 def date(): import dat...
these data have been supplied as shapefiles, so I needed to quickly extract parts of a shapefile dataset and convert them to a raster in a standardised format. Preferably with as little repetitive coding as possible. So I created a simple and relatively flexible function to do the job for ...
For details, see Kernel Density raster function. LandTrendr Analysis Evaluates changes in pixel values over time using the Landsat-based detection of trends in disturbance and recovery (LandTrendr) method and generates a change analysis raster containing the model results. For details, see ...
Extract Bands Reorders or extracts bands from a raster. ArcGIS Pro Basic Geometric Median The Geometric Median function calculates the geometric median across pixels in a time series of multiband imagery. Image Analyst Interpolate Irregular Data Interpolates from point clouds or irregular grids. ArcGI...
In addition to the summary operations described above,exact_extractcan accept an R function to summarize the cells covered by the polygon. Becauseexact_extracttakes into account the fraction of the cell that is covered by the polygon, the summary function must take two arguments: the value of ...
exactextractprovides a fast and accurate algorithm for summarizing values in the portion of a raster dataset that is covered by a polygon, often referred to aszonal statistics. Implemented in C++, it is available through a command line interface as well as packages forPythonandR. More information...
从R中的rasterbrick对象创建长格式数据框可以通过以下步骤实现: 1. 首先,确保已经安装并加载了raster包,以便使用rasterbrick对象和相关函数。 2. 使用raster函数...