bcgov/wps

Weather Toolkit: Clip data extent prior to processing

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#5,338 opened on Apr 22, 2026

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4RefinementGood First IssueTaskUser Requested

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Description

Describe the task

The four panel chart plotter code currently uses the entire global/regional grib file. We could apply a mask to the data based on the latitude and longitude plus a buffer to restrict the quantity of data being processed. The latitude buffer can be pretty tight, but the longitude buffer needs to be quite wide to account for the spatial reference used by the four panel charts.

Clip data extent prior to processing 4-panel weather charts instead of using the entire global extent.

Acceptance Criteria

  • Apply latitude and longitude extent mask to RDPS and GDPS model data prior to processing charts.

Additional context

  • Currently reading in data for all latitudes and longitudes.
  • Or here

Contributor guide

Research direction
Inspect the data retrieval and processing code for RDPS/GDPS models to locate where the full grib extent is used. Identify the latitude/longitude bounds for the four panel charts and apply a masking step to clip the data before processing.
Tech stack
python
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75