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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | 1x 1x 8x 8x 4x 4x 3x 3x 3x 2x 2x 1x | const _ = require('lodash')
const OGC_WGS84 = 'ogc:1.3:crs84'
function getCollectionCrs (collection) {
const collectionCrs = _.get(collection, 'crs.properties.name')
if (!collectionCrs) return
const crs = collectionCrs.toLowerCase().replace(/urn:ogc:def:crs:/, '')
if (crs === OGC_WGS84) return
const crsRegex = /(?<authority>[a-z]+)(::|:)(?<srid>.+)/
const result = crsRegex.exec(crs)
if (!result) return
const { groups: { srid } } = result
return srid
}
module.exports = getCollectionCrs
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