Tile Probability Depth

Tile Probability Depth Method

tile.get_probability_depth(
    coordinate, 
    year,
    return_period,
    image=False,
    output_dir='/output'
)

Provides a 256x256 map tile that represents flood inundation with 5 depth thresholds (1-15cm (0-6in), 16-30cm (6-12in), 31-61cm (12-24in), 62- 91cm (24-36in), 92+cm (36+in)).

In addition to a zoom level and x,y coordinates based on the Mercator projection, this API requires a return period (500, 100, 20, 5, or 2 years), year of annual risk (2020, 2035, or 2050).

This method returns an array of Probability Depth Tile product for the given coordinates, and optionally creates an image file.

(More information on the Tile Probability Depth product can be found on the Tile Probability Depth Page on the First Street Foundation API Data Dictionary)

Arguments:

• coordinate: list of tuple of int [(z, x, y)], coordinates to retrieve tile historic event.
• year: int, the year of annual risk (2020, 2035, or 2050) to retrieve the tile for.
• return_period: int, the return period (500, 100, 20, 5, or 2 years) to retrieve the tile for.
• image: bool, whether to create an image for the retrieved data.
• output_dir: string, location to output the created image (if image is True).

Example (Command Line):

# Call tile.get_probability_depth on a list with 2 coordinates
python -m firststreet -p tile.get_probability_depth -i (10,942,1715);(12,942,1715) -year 2050 -return_period 500

Example (Python File):

# Contents of sample.py
# Create a `FirstStreet` object.  
import firststreet
fs = firststreet.FirstStreet("api-key")

# Call tile.get_probability_depth on a list with 1 county FSID
tile_probability_depth = fs.tile.get_probability_depth(coordinate=[(10,942,1715), (12,942,1715)], year=2050, return_period=500)

# Call tile.get_probability_depth on a file of SearchItems
tile_probability_depth = fs.tile.get_probability_depth("sample.txt", csv=True)

Tile Probability Depth Objects

TileProbabilityDepth Object

Key	Type	Description	Example
coordinate	tuple	A zoom, X, Y coordinate, with the X and Y value based on the Mercator Projection	(10,942,1715)
year	int	Year of annual risk - 2020, 2035, 2050	2050
returnPeriod	int	Return period - 500, 100, 20, 5, or 2	100
image	bytes	The tile image in raw bytes	b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x01\x00...