Raster Layer

The Raster Layer is used to render numpy arrays extracted from a TIFF, geoTIFF or of any similar format.


data the ndarray. The data to be drawn on the map.

bounds Bounds for the image on the map in the form [[lat_min, lon_min], [lat_max, lon_max]]

name Str value serving as a unique identifier for this layer component. Which will also appear in the layer controls.

description Description string value rendered on the UI.

origin ([‘upper’ | ‘lower’], optional, default ‘upper’) Where to place the [0,0] index of the bounds array in the upper left or lower left corner of the axes.

visible Boolean toggle to turn on or off a Base Layer. A Greppo App can have multiple Tile Layers.

opacity Change the opacity of the layer using a float value between 0.0 and 1.0.

colormap Function of the form [x -> (r,g,b)] or [x -> (r,g,b,a)] for transforming a mono image into RGB. It must output iterables of length 3 or 4, with values between 0 and 1. Hint: you can use colormaps from matplotlib.cm.

Usage (General)

from greppo import app
import numpy as np

band = np.zeros((61, 61))
band[0, :] = 1.0
band[60, :] = 1.0
band[:, 0] = 1.0
band[:, 60] = 1.0

    bounds=[[0, -60], [60, 60]],
    colormap=lambda x: (1, 0, 0, x),
    description='A large red rectangle on a map.',