image_count() did not work with sentinel-1 image collection

[singhamninder]

Environment Information

• geemap version: 0.16.4
• Python version:3.9.10
• Operating System: M1 pro Macbook

Description

I am trying to use the very handy geemap.image_count() function, which seems to work in other cases except for COPERNICUS/S1_GRD ImageCollection.

Here is the code that I used

image_count = geemap.image_count(ee.ImageCollection('COPERNICUS/S1_GRD'),
                    region = conUS, start_date='2019-01-01', end_date='2019-06-01', clip=True)

However, it does work if I use the Angle band for Sentinel-1 imagery as follows:

collection = ee.ImageCollection('COPERNICUS/S1_GRD') \
                .filterBounds(conUS)
image_count = collection.select([collection.first().bandNames().get(2)]) \
                .reduce(ee.Reducer.count()) \
                .clip(conUS)

I am not sure why that is. Perhaps some adjustments are needed to the image_count() to account for this :)

[giswqs]

That probably means that not all images in the collection have the same bands. You should just select one single band that exists in all images.

[karelvancamp]

Use 'VV' for land.

[karelvancamp]

There is a function available that allows for filtering of bands on sentinel 1.

Created some time ago due to the unique nature of this specifc dataset (not all bands are available in every picture: based on band selection, one has first to apply specific filters on image properties before being able to select from subsets where band is always available).

from geemap import timelapse
import geemap

counts = image_count(timelapse.sentinel1_filtering(ee.ImageCollection('COPERNICUS/S1_GRD'), band='VV'),
                    region = None, start_date='2019-01-01', end_date='2022-06-01')

Map.addLayer(counts, {'min':100, 'max': 800, 'palette': ['006633', 'E5FFCC', '662A00', 'D8D8D8', 'F5F5F5']},
             'image count')

Map.centerObject(roi)

[giswqs]

I have added a band parameter for the image_count() function. Update the package using geemap.update_package() and restart the kernel to take effect.

import ee
import geemap

Map = geemap.Map()
region = ee.Geometry.BBox(-126.2988, 27.0591, -70.8398, 50.1769)
collection = ee.ImageCollection('COPERNICUS/S1_GRD')
image = geemap.image_count(collection, region=region, band='VV', clip=True)
vis = {'min':100, 'max': 800, 'palette': 'coolwarm'}
Map.addLayer(image, vis,'image count')
Map.add_colorbar(vis)
Map.centerObject(region)
Map