Create terrain from a local raster

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Set the terrain surface with elevation described by a raster file.

Image of create terrain from a local raster

Use case

In a scene view, the terrain surface is what the basemap, operational layers, and graphics are draped onto. For example, when viewing a scene in a mountainous region, applying a terrain surface to the scene will help in recognizing the slopes, valleys, and elevated areas.

How it works

  1. Create an ArcGISScene and add it to a SceneView.
  2. Create a RasterElevationSource with a list of raster file paths.
  3. Add this source to the scene's base surface: ArcGISScene.baseSurface.elevationSources.add(RasterElevationSource).

Relevant API

  • RasterElevationSource
  • Surface

Additional information

Supported raster formats include:

  • ASRP/USRP
  • CIB1, 5, 10
  • DTED0, 1, 2
  • GeoTIFF
  • HFA
  • HRE
  • IMG
  • JPEG
  • JPEG 2000
  • NITF
  • PNG
  • RPF
  • SRTM1, 2

Offline data

  1. Download the data from ArcGIS Online.
  2. Extract the contents of the downloaded zip file to disk.
  3. Open your command prompt and navigate to the folder where you extracted the contents of the data from step 1.
  4. Execute the following command:

adb push MontereyElevation.dt2 /sdcard/ArcGIS/Raster/dt2/MontereyElevation.dt2

Link Local Location
Monterey Elevation Raster File <sdcard>/ArcGIS/Raster/dt2/MontereyElevation.dt2

Tags

3D, elevation, raster, surface, terrain

Sample Code

MainActivity.kt
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/*
 * Copyright 2019 Esri
 *
 * 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 com.esri.arcgisruntime.samples.createterrainfromalocalraster

import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
import com.esri.arcgisruntime.loadable.LoadStatus
import com.esri.arcgisruntime.mapping.ArcGISScene
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.RasterElevationSource
import com.esri.arcgisruntime.mapping.view.Camera
import com.esri.arcgisruntime.mapping.view.SceneView
import com.esri.arcgisruntime.samples.createterrainfromalocalraster.databinding.ActivityMainBinding
import java.util.*

class MainActivity : AppCompatActivity() {

    private val TAG = this::class.java.simpleName

    private val activityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    private val sceneView: SceneView by lazy {
        activityMainBinding.sceneView
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(activityMainBinding.root)

        // authentication with an API key or named user is required to access basemaps and other
        // location services
        ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY)

        // create and add a scene with an imagery basemap
        sceneView.scene = ArcGISScene(BasemapStyle.ARCGIS_IMAGERY)

        // specify the initial camera position
        sceneView.setViewpointCamera(Camera(36.525, -121.80, 300.0, 180.0, 80.0, 0.0))

        // raster package file paths
        val filePaths = ArrayList<String>()
        filePaths.add(getExternalFilesDir(null)?.path + getString(R.string.raster_package_location))

        try {
            // add an elevation source to the scene by passing the URI of the raster package to the constructor
            with(RasterElevationSource(filePaths)) {
                // add a listener to perform operations when the load status of the elevation source changes
                this.addLoadStatusChangedListener { loadStatusChangedEvent ->
                    // when elevation source loads
                    if (loadStatusChangedEvent.newLoadStatus == LoadStatus.LOADED) {
                        // add the elevation source to the elevation sources of the scene
                        sceneView.scene.baseSurface.elevationSources.add(this)
                    } else if (loadStatusChangedEvent.newLoadStatus == LoadStatus.FAILED_TO_LOAD) {
                        // notify user that the elevation source has failed to load
                        logErrorToUser(
                            getString(
                                R.string.error_raster_elevation_source_load_failure_message,
                                this.loadError
                            )
                        )
                    }
                }
                // load the elevation source asynchronously
                this.loadAsync()
            }
        } catch (e: IllegalArgumentException) {
            // catch exception thrown by RasterElevationSource when a file is invalid/not found
            logErrorToUser(
                getString(
                    R.string.error_raster_elevation_source_load_failure_message,
                    e.message
                )
            )
        }
    }

    private fun AppCompatActivity.logErrorToUser(message: String) {
        Toast.makeText(this, message, Toast.LENGTH_LONG).show()
        Log.e(TAG, message)
    }
}

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