geotrellis.stac.raster.StacItemAsset.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 geotrellis.stac._
import com.azavea.stac4s.{StacAsset, StacItem}
import geotrellis.proj4.CRS
import geotrellis.raster.{CellSize, Dimensions, GridExtent, RasterExtent}
import geotrellis.stac.extensions.proj.ProjTransform
import geotrellis.vector.{Extent, Geometry}

case class StacItemAsset(itemAsset: StacAsset, item: StacItem) {
  def href: String = itemAsset.href
  def bandCount: Option[Int] = item.bandCount
  def crs: Option[CRS] = itemAsset.crs.orElse(item.crs)

  // geometry can be taken from the proj extension or projected from the LatLng geometry
  def getGeometry: Option[Geometry] = itemAsset.getGeometry.orElse(item.getGeometry)
  def getExtent: Option[Extent] = itemAsset.getExtent.orElse(item.getExtent)

  def transform: Option[ProjTransform] = itemAsset.transform.orElse(item.transform)

  // https://github.com/radiantearth/stac-spec/blob/v1.0.0-rc.1/item-spec/common-metadata.md#gsd
  def gsd: Option[Double] = itemAsset.gsd.orElse(item.gsd)

  // the cellSize can be extracted from the transform object or derived from the given extent and shape
  def cellSize: Option[CellSize] = itemAsset.cellSize.orElse(item.cellSize)

  def gridExtent: Option[GridExtent[Long]] = itemAsset.gridExtent.orElse(item.gridExtent)
  def rasterExtent: Option[RasterExtent] = itemAsset.rasterExtent.orElse(item.rasterExtent)
  def dimensions: Option[Dimensions[Long]] = itemAsset.dimensions.orElse(item.dimensions)
}