Age of Imperviousness
Impervious surface by estimated date of conversion. Used to estimate level of current stormwater treatment.
Description
This layer provides multi-temporal information on the presence of built-up surfaces derived from global Landsat satellite data collected from 1975 to 2014. The base image data collections were prepared by the Global Land Survey and the Joint Research Center. The data was processed by fully automatic and reproducible methods based on statistical learning (Symbolic Machine Learning. The source product was developed with a spatial resolution of 30 meters. To provide a finer resolution for the stormwater heatmap, the source product was masked by 1-meter resolution imperviousness data developed by the Nature Conservancy.
Layer Access in Earth Engine
The javascript commands below can be used to access this layer within the Google Earth Engine Code Editor. A Google Earth Engine account is required.
// Import the layer data dictionary
var data = require('users/stormwaterheatmap/apps:data/public')
// To view data dictionary, print to the console:
print('Data:', data)
//Get this layer from the layer data dictionary:
var layer_name = data.rasters["Age of Imperviousness"]
Viewing
Individual objects contain all the info used in the stormwater heatmap. To add it to the map, add the layer object.
var display_image = layer_name.layer
Map.addLayer(display_image)
Analysis
To get the raw image data for analysis, access the eeObject key.
var raw_image = layer_name.layer.eeObject
Map.addLayer(raw_image,{},'Age of Imperviousness')
Layer Full-Extent Download
Click the "download" link to initiate the download process. The data will download as a GeoTIFF file (the file size is listed beside the layer name) and a WGS 84 projection. The resolution is the finest available based on the source data.
Age of Imperviousness (11.3 MB) download
Visualization
Palette
| Label | Raster value | Colors |
|---|---|---|
| 2000–2014 (stormwater likely treated) | 3 | 9e+73 |
| 1990–2000 (some stormwater treatment) | 4 | F0E442 |
| Before 1990 (likely no stormwater treatment) | 5 | CC6677 |
Source
The Nature Conservancy; Columbia University, Center for International Earth Science Information Network