pylerc

library4.1pypypiunverified

Limited Error Raster Compression (LERC) library with Python bindings. Version 4.1 supports compression/decompression of rasters with a user-specified max error. Release cadence: approximately yearly, aligned with ArcGIS releases.

data serialization gcp

pip install pylerc

github ↗package ↗

INSTALL

IMPORT

SIG · PYLERC

pylerc

datapythonv4.1

Install

3.8s avg

Import

—

Disk

91MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v4.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.000s · 93MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 3.8s · import 0.000s · 89MB

91MB installed

● package 91MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Lerc

✓ import lerc

✗ from pylerc import Lerc

Encode and decode a 2D float array with LERC compression.

import numpy as np from pylerc import Lerc # Create a sample 2D float array (height, width) data = np.array([[1.0, 2.0], [3.0, 4.0]], dtype=np.float32) # Encode with max error 0.1 encoder = Lerc() encoded = encoder.encode(data, maxzerror=0.1) print(f"Encoded size: {len(encoded)} bytes") # Decode back decoded = encoder.decode(encoded) print("Decoded array:", decoded)

Debug

Known issues

breakingPackage renamed from 'lerc' to 'pylerc' starting v4.1.0. 'pip install lerc' will install an older (pre-4.0) version. Uninstall old lerc package before installing pylerc.

fix

pip uninstall lerc && pip install pylerc

affects: >=4.1.0

breakingThe Lerc class API changed in v4.0.0: encode() now takes data as the first positional argument (previously took maxzerror first). Old code using Lerc().encode(maxzerror, data) will silently produce incorrect results or raise TypeError.

fix

Change to Lerc().encode(data, maxzerror=0.1)

affects: >=4.0.0,<5

gotchaThe Lerc class instance is stateful; do not use the same instance for concurrent encoding/decoding without locking. Reuse is safe sequentially.

fix

Create separate Lerc instances per thread or synchronize access.

affects: >=4.0.0

deprecatedConda package is no longer updated for pylerc; only pip install is supported.

fix

Use pip install pylerc

affects: >=4.1.0

Upgrade

Version history

4.1latest on PyPI · released Mar 10, 2026

Audit

Dependencies

numpyrequiredRequired for array handling

Agent activity

42 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/Esri/lerc ↗

packagehttps://pypi.org/project/pylerc/ ↗