Analyze hotspots

View on GitHub

Sample viewer app

Use a geoprocessing service and a set of features to identify statistically significant hot spots and cold spots.

Image of analyze hotspots

Use case

This tool identifies statistically significant spatial clusters of high values (hot spots) and low values (cold spots). For example, a hotspot analysis based on the frequency of 911 calls within a set region.

How to use the sample

Tap on Analyze, and select a date from the "FROM" DatePicker and "TO" DatePicker to get a date range from the BottomSheet and tap on Run analysis. The results will be shown on the map upon successful completion of the GeoprocessingJob.

How it works

Create a GeoprocessingTask with the URL set to the endpoint of a geoprocessing service.
Create a query string with the date range as an input of GeoprocessingParameters.
Use the GeoprocessingTask to create a GeoprocessingJob with the GeoprocessingParameters instance.
Start the GeoprocessingJob and wait for it to complete and return a GeoprocessingResult.
Get the resulting ArcGISMapImageLayer using GeoprocessingResult.mapImageLayer.
Add the layer to the map's operational layers.

Relevant API

GeoprocessingJob
GeoprocessingParameters
GeoprocessingResult
GeoprocessingTask

Additional information

This sample uses the GeoViewCompose Toolkit module to be able to implement a Composable MapView.

Sample Code

MainActivity.kt

MapViewModel.kt

BottomAppContent.kt

BottomSheetScreen.kt

MainScreen.kt

Use dark colors for code blocksCopy
/* Copyright 2023 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.arcgismaps.sample.analyzehotspots

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.runtime.Composable
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.esri.arcgismaps.sample.sampleslib.theme.SampleAppTheme
import com.esri.arcgismaps.sample.analyzehotspots.screens.MainScreen

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // authentication with an API key or named user is
        // required to access basemaps and other location services
        ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.ACCESS_TOKEN)

        setContent {
            SampleAppTheme {
                AnalyzeHotspotsApp()
            }
        }
    }

    @Composable
    private fun AnalyzeHotspotsApp() {
        Surface(
            color = MaterialTheme.colorScheme.background
        ) {
            MainScreen(
                sampleName = getString(R.string.analyze_hotspots_app_name)
            )
        }
    }
}