Doing mappy and data things for City of Raleigh Parks, Recreation and Cultural Resources Department.
Published
Edited
May 9, 2022
4 stars
lineSplitByClipArea = {
// Setup an empty array to collect line segmets clipped by clip area
let linesArray = []
turf.featureEach(lineJSON, line => {
// Check if the line feature is fully within the clip area. If it is, add it to linesArray.
if (turf.booleanWithin(line, clipAreaJSON.features[0])) {
linesArray.push(line)
} else {
// If the feature is not fully within the clip area, split the line by the clip area
let splitResults = turf.lineSplit(line, clipAreaJSON.features[0])
// Take the resulting features from the split, calculate a point on surface, and check if the point is within the clip area. If it is, add the line segment to linesArray.
turf.featureEach(splitResults, splitResult => {
let pof = turf.pointOnFeature(splitResult)
if (turf.booleanWithin(pof, clipAreaJSON.features[0])) {
linesArray.push(splitResult)
}
})
}
})
return turf.featureCollection(linesArray)
}
dissolvedLineSplitByClipArea = {
// Flatten all features into an aray to explode any MultiLinestring features to LineString feature
let flattenedLines = lineSplitByClipArea.features
.map(feature => turf.flatten(feature))
.map(fc => fc.features).flat()
// Create FeatureCollection of flattened LineString features
let flattenedLinesFC = turf.featureCollection(flattenedLines)
// Combine LineString features into a single MultiLineString
return turf.combine(flattenedLinesFC)
}
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