Skip to main content

Slope Categories

Categorized ground surface slope

Description

Categorized ground surface slope

Slope values were calculated from the USGS National Elevation Dataset. Elevations were provided in 1⁄3 arc-second resolution (approximately 10-meters). Slope was calculated using the 4-connected neighbors of each pixel and classified into the following categories, consistent with Ecology guidance:

  • Flat: < 5%
  • Moderate: 5-15%
  • Steep: > 15%

The NED is derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. NED data are distributed in conformance with the North American Datum of 1983 (NAD 83). All elevation values are referenced to the North American Vertical Datum of 1988 (NAVD 88).

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["Slope Categories"]

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,{},'Slope Categories')

Visualization

Palette

LabelRaster valueColors
Flat0#009B9E#009B9E
Moderate1#F1F1F1#F1F1F1
Steep2#C75DAB#C75DAB

Source

The Nature Conservancy