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Liz Sanderson

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Articles

Recent activity by Liz Sanderson

  • Simple Examples Using the RasterExpressionEvaluator Transformer

    IntroductionThe RasterExpressionEvaluator is a transformer that evaluates expressions on each cell in a raster, such as algebraic operations or conditional statements. This article will demonstrate...

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  • Polygon in Polygon Overlay

    IntroductionIn this exercise, you will learn how to perform a union between overlapping polygon features using the AreaOnAreaOverlayer. The AreaOnAreaOverlayer is typically used for three main oper...

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  • Raster Neighborhood Functions | Using the RasterConvolver

    IntroductionThe RasterConvolver is a transformer that applies a convolution filter to raster data. Convolution filters are applied using a kernel, specified as a matrix of weights for neighboring v...

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  • Line in Polygon

    IntroductionIn this exercise, you will use the SpatialFilter to set a spatial predicate that will determine which line features intersect polygon features. The SpatialFilter compares two sets of fe...

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  • Select Data by Area Masks

    IntroductionExtracting data using area masks in FME requires both a raster and a vector dataset, as well as the Clipper transformer. In this tutorial, you will select raster data within polygon fea...

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  • How to Create a TIN from Point Data

    IntroductionIn this tutorial, you will learn how to create a Triangulated Irregular Network (TIN) from a 3D point dataset using the TINGenerator in FME. The TINGenerator in FME can create TINs from...

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  • Generate Contour Data from Points

    Introduction In this tutorial, you will learn how to create contour lines using the ContourGenerator and a point dataset. The ContourGenerator in FME constructs a Delaunay triangulation based on th...

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  • Buffering Features for Spatial Relationship Analysis

    IntroductionWhen assessing spatial relationships, a common scenario is determining whether one feature is within X distance of another; for example, is there a fire station/hall within 5km of a pla...

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  • Shortest Route Calculations with the ShortestPathFinder

    IntroductionShortest route calculations are done in FME using the ShortestPathFinder transformer. This transformer calculates the shortest path between a source and a destination node in a given ne...

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  • Creating Time and Distance Isolines using the NetworkCostCalculator

    IntroductionIsolines are lines depicting constant values; for example, a contour is an isoline that depicts a line of constant elevation.Isodistances and isochrones are a form of isolines. Isodista...

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