Find locations

The ArcGIS API for Python packs a set of tools to discover features that pass a number of criteria that you specify. These tools are typically used for site selection, view shed analysis, downstream analysis, where the objective is to find places that satisfy multiple criteria.

Trace downstream

The Trace Downstream tool determines the downstream flow paths from specified input locations. This tool uses the world elevation service to determine the downstream flow path of fluids (like drain or storm water) from a specified point of interest. This tool is particularly useful in predicting the course of flash floods, dispersion of water borne pollutants etc.

In the example below, we observe how this tool can be used to calculate the flow path of snow melt in mountains of southern California.

Input
# connect to GIS
from arcgis.gis import GIS
gis = GIS("portal url", "username", "password")
Input
search_result = gis.content.search("Big bear", "feature collection", max_items=1)
bigbear_item = search_result[0]
bigbear_item
Output
Big Bear mountains
mountainsFeature Collection by arcgis_python_api
Last Modified: December 09, 2016
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Input
map1 = gis.map("Big bear, California")
map1

Input
map1.add_layer(bigbear_item)
Input
# create a feature collection to represent big bear from the item
bigbear_fc = bigbear_item.layers[3]

# import the find_locations sub module
from arcgis.features import find_locations
Input
trace1 = find_locations.trace_downstream(bigbear_fc)
Submitted.
Executing...
Input
map1.add_layer(trace1)

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