River Ice Annual Change

Annual changes in ice cover are detected based on satellite ice classification, comparing dates to one year ago for seasonal changes.

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File Provider (EO Team)

Product Description

Information required for product development.

Service Name	Description	Data Owners	File Type
River Ice	A comparison between current ice conditions with those from last year	Pradeep, Kelley, Mike	.shp (shapefile)

Ancilliary Information

• Product set-up prerequisites:
  • AOI
  • Locations/places
  • Segments and Labels
  • SIMBA Stations

Naming Convention

The following naming convention applies to all River Ice Annual Change files sent to WRMD:

YYYY-MM-DD_RRR_ PPP_SS.jpg
YYYY - Year
MM - Month
DD - Day
RRR - River
PPP – Products (Ice Cover ICOV, Ice Classification CLS, Change Detection CHG)
SS - Sensor

Example:

2020-05-20_CHU_CHG_ANNUAL_R2

Symbology

The detection product shows changes in ice and water locations, relative to land. River ice change detection levels are scattered into one of 5 categories. Categories are defined as:

Label	Color	Value
Much less ice	#0001FC	-2
Less ice	#31CCFB	-1
No change	#009B01	0
More ice	#FDFE00	1
Much more ice	#FE0002	2

File Uploading Instructions

• All River Ice Annual Change files should be uploaded to Coresight’s Amazon S3 Bucket:
  • S3 link here.
  • Contact Coresight for account credentials (alias, username and password)
• Fill out the Coresight Product Onboarding Checklist for new products.

Example Input Image

Example shapefile uploaded to Coresight cloud storage.

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Coresight

Developers

• Jeremy Hetzel
• Chris Boyce.

Processing

Description

Data processing takes place using an ingester that imports, converts, creates and stores files.

Ingester Script

The bulk of the ingestion work on each file is done in the cloud and the script can be found in the river-ice-ingester repository.

Ingester Functions

• File conversion - shapefile to geoJSON to MapBox Vector Tiles
• File storage - Vector Tiles and geoJSON files on AWS cloud storage
• STAC item creation - Automatic naming based on date, product type and AOI matching.
• STAC catalog:
  • Automatic STAC item sorting based on item name.
  • Automatic storage in a Firestore collection based on product type and AOI matching.
• Notification - emails developers upon product publication.

Real time API Access

The FastAPI OpenAPI endpoint for the river-ice-ingester can be found here.

Service Interface

• The River Ice Web interfaces retrieve product information through the firestore collection.

• River Ice Annual Change on the Churchill interface (figure below):

  • The layout for the annual ice change analysis is similar to the ice change analysis.
  • Annual change displays the changes in ice cover annually, once per month.
  • The legend is displayed in the bottom right corner.
  • By default, the most recent analysis is displayed and the user can review other dates by using the upper left graphic.