Age of Imperviousness
Impervious surface by estimated date of conversion
| Earth Engine asset | Age_of_Imperviousness (open) |
| Period | 1975 to 2014 |
| Units | epoch |
| Data type | Categorical |
| Pixel size | 15.0 m (EPSG:3857) |
| Pixel type | uint8 |
| Download | Cloud-Optimized GeoTIFF (7.8 MB) |
| Catalog entry | STAC item |
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 below loads this layer in the Earth Engine Code Editor. An Earth Engine account is required. The "open" links above show each asset's details in the Code Editor.
// 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"]
// Add the styled layer to the map:
Map.addLayer(layer_name.layer)
// Raw image for analysis:
var raw_image = layer_name.layer.eeObject
Map.addLayer(raw_image, {}, 'Age of Imperviousness')
Visualization
| Label | Raster value | Color |
|---|---|---|
| 2000–2014 | 3 | #009E73 |
| 1990–2000 | 4 | #F0E442 |
| Before 1990 | 5 | #CC6677 |