Use a geoprocessing service and a set of features to identify statistically significant hot spots and cold spots.
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
GeoprocessingTaskwith 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
GeoprocessingTaskto create aGeoprocessingJobwith theGeoprocessingParametersinstance. - Start the
GeoprocessingJoband wait for it to complete and return aGeoprocessingResult. - Get the resulting
ArcGISMapImageLayerusingGeoprocessingResult.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.
Tags
analysis, density, geoprocessing, geoviewcompose, hot spots, hotspots, toolkit
Sample Code
/* 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.API_KEY)
setContent {
SampleAppTheme {
AnalyzeHotspotsApp()
}
}
}
@Composable
private fun AnalyzeHotspotsApp() {
Surface(
color = MaterialTheme.colorScheme.background
) {
MainScreen(
sampleName = getString(R.string.app_name)
)
}
}
}