Kilometers squared of softbottom habitat. Within the exclusive economic sozne and dividing that sum by the Regions, then spatially standardized by summing each fishing coordinate The fisheries catch data is rasterizedĪnd overlaid onto polygons of exclusive economic zones for all OHI Habitat destruction was by using annual fisheries catch data as a proxyįor trawling and dredging activity, because these types of fishing The way the Ocean Health Index historically calculated soft bottom Index analysis of marine soft bottom habitat Let’s take a look at how my team and I converted the Ocean Health Also know as down-sampling.Ĭreate a frequency table of the values of a raster. The value for the resulting cells is computed withĪ user-specified function. Aggregation groups rectangular areas toĬreate larger cells. Terra::vect() then input that object intoĬombine cells of a raster to create a new raster with a lower Vectorize the geometry column of the polygons using The user cannot input the entire spatial dataframe, but rather needs to Object from which we are extracting is a geometry columns of polygons, Vector or matrix/dataframe of coordinates. For terra, the second spatial object must be a Raster(), the spatial objects can be points, lines, and Of another spatial object, such as points that fall within polygons. Pull values from a raster object where they intersect the locations The higher resolution of the second raster. If the same function is applied to each layer.Ĭonvert the origin and/or resolution of a raster to that of another.įor example, you might want to add two rasters, but need to convert theįirst raster from a resolution of 0.5 degrees to 0.01 degrees to match Terra has multiple functions with varying degrees ofįlexibility depending on if the function is applied across layers, and It can detect the quantity of spatRasters present, thenĪutomatically stacks them if there are multiple.Įxecute a function across a raster or raster stack. Terra::rast() is a more broadly applicable function since tif or a spatialĭataframe) into a rasterLayer (for the rasterĬreate raster stack to execute calculations across layers. Some examples of similar functions between raster and Tackled this spatial switch through the lens of Global Fishing Watch As a data scientist fellow at the Ocean Health Index, I Raster, but with faster processing speeds and more flexibleįunctions. Terra package is essentially the modern version of Trends in environmental science, the Ocean Health Index is making In an effort to stay up to date with the new hip The raster package to wrangle spatial data and produce Many data enthusiasts have historically utilized Resolutions and coordinate reference systems, it can be challenging to With so many different spatial file types Spatial data in R has a reputation for being tedious and
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