geotrellis.stac.raster.StacAssetOps.scala Maven / Gradle / Ivy

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GeoTrellis Server is a set of components designed to simplify viewing, processing, and serving raster data from arbitrary sources with an emphasis on doing so in a functional style.

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/*
 * Copyright 2021 Azavea
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package geotrellis.stac.raster

import cats.syntax.apply._
import com.azavea.stac4s.StacAsset
import com.azavea.stac4s.syntax._
import geotrellis.proj4.CRS
import geotrellis.raster.{CellSize, Dimensions, GridExtent, RasterExtent}
import geotrellis.stac.extensions.proj.{ProjItemExtension, ProjTransform}
import geotrellis.vector._

case class StacAssetOps(self: StacAsset) {
  def projExtension: Option[ProjItemExtension] = self.getExtensionFields[ProjItemExtension].toOption

  def crs: Option[CRS] =
    projExtension
      .flatMap(_.epsgCode)
      .map(CRS.fromEpsgCode)
      .orElse {
        projExtension
          .flatMap(_.wktString)
          .flatMap(CRS.fromWKT)
      }

  def getGeometry: Option[Geometry] = projExtension.flatMap(_.geometry)
  def getExtent: Option[Extent] = getGeometry.map(geom => Extent(geom.getEnvelopeInternal))

  def transform: Option[ProjTransform] = projExtension.flatMap(_.transform)

  // https://github.com/radiantearth/stac-spec/blob/v1.0.0-rc.1/item-spec/common-metadata.md#gsd
  def gsd: Option[Double] = self.extensionFields("gsd").flatMap(_.as[Double].toOption)

  // the cellSize can be extracted from the transform object or derived from the given extent and shape
  def cellSize: Option[CellSize] =
    transform
      .map(_.cellSize)
      .orElse((getExtent, dimensions).mapN { case (e, Dimensions(c, r)) =>
        GridExtent(e, c, r).cellSize
      })
      .orElse(gsd.map(d => CellSize(d, d)))

  def gridExtent: Option[GridExtent[Long]] = (getExtent, cellSize).mapN(GridExtent.apply[Long])
  def rasterExtent: Option[RasterExtent] = gridExtent.map(_.toRasterExtent)
  def dimensions: Option[Dimensions[Long]] = projExtension.flatMap(_.shape).map(_.toDimensions)
}