We have the data that we need to begin building the map for our report. Our approach will be the following steps:
Enhancing the elevation and base map images with filters
Blending the images together to provide a hillshaded OSM map
Creating a translucent layer to draw the street route
Blending the route layer with the hillshaded map
These tasks will all be accomplished using the PIL Image and ImageDraw modules:
# Convert the numpy array back to an image
relief = Image.fromarray(shaded).convert("L")
# Smooth the image several times so it's not pixelated
for i in range(10):
relief = relief.filter(ImageFilter.SMOOTH_MORE)
log.info("Creating map image")
# Increase the hillshade contrast to make
# it stand out more
e = ImageEnhance.Contrast(relief)
relief = e.enhance(2)
# Crop the image to match the SRTM image. We lose
# 2 pixels during the hillshade process
base = Image.open(osm_img + ".jpg").crop((0, 0, w-2, h-2))
# Enhance base map contrast before blending
e = ImageEnhance...