Step 1.
click emergency data
https://egis-lacounty.hub.arcgis.com/
Step 2.
click point of interest
https://data.lacounty.gov/pages/emergency
Why we need point of interest data ?
User call 911, usually don't know their address, not all police department can track user location by user's cell phone signal.
User may call or text 911, for example, " I am at motel 6 parking lot, I don't know what street is...."
911 should use "motel 6" to quickly locate user's location.
Step 3.
Arcgis REST api endpoint is here
https://data.lacounty.gov/maps/c5a91c789041455485de39a45d0aae0c/about
Step 3.1
https://services.arcgis.com/RmCCgQtiZLDCtblq/arcgis/rest/services/Points_of_Interest/FeatureServer
Step 4.
view all layers on map click here
Step 5.
https://www.arcgis.com/home/item.html?id=c5a91c789041455485de39a45d0aae0c
Step 6.
all layers is on ESRI map now
https://www.arcgis.com/apps/mapviewer/index.html?layers=c5a91c789041455485de39a45d0aae0c
Step 7.
all layers is on Google map with Street view is always on, click here
https://transparentgov.net/json2tree/esri/server/folder2.html?org=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices%2FPoints_of_Interest%2FFeatureServer&url=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices%2FPoints_of_Interest%2FFeatureServer&arcgis_online_token=&select_folder=1&select_folder_text=Points_of_Interest+%3Csup%3EMapServer%3C%2Fsup%3E&select_layer=5&select_layer_text=5+%26%23x21E2%3B+Public+Safety+%3Csup%3EFeature+Layer%3Csub%3E+esriGeometryPoint%3C%2Fsub%3E%3C%2Fsup%3E
Step 8.
public safty layer
https://transparentgov.net/json2tree/datahub.io/embed/google_streetview_fullscreen.html?layer_id=5&layer=Public+Safety¢er_lat=33.33946599399052¢er_long=-118.3289781221033¢er_zoom=20&url=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices%2FPoints_of_Interest%2FFeatureServer&panto=0
Step 9.
I only want to see police station in public safty layer, use model classified
https://transparentgov.net/json2tree/datahub.io/usgs/classify_data.html?backgroundlayerurl=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices%2FPoints_of_Interest%2FFeatureServer%2F5&layer=Public+Safety&_center_zoom=11&_center_lat=33.900231718684985&_center_long=-118.20077310082303&select_field=2&select_fieldvalue=1&distinctorgroupby=groupby
Step 9.1
use model classified