Your lidar says 40 m and reaches 9 m: the four numbers that decide a real range
Your lidar says 40 m. Outdoors it stops at 9 m. Nothing is broken — the datasheet was measured under conditions nobody wrote down. I maintain an open dataset of laser rangefinder and single-point lidar modules ( specs.erdilrf.com ), and the most common support question is some variant of "why is my range so much worse than the datasheet?" It is almost always one of four numbers, and the datasheet…
Lidar systems present four key factors that determine their effective range: target reflectance, background illumination, atmospheric conditions, and integration time/rate. Manufacturers often provide a single range figure without disclosing the specific conditions under which it was measured. To obtain accurate range data, it is crucial to inquire about the exact scenario behind each figure.
Reflectance varies greatly depending on the target material, with matte grey walls around 10-20%, black anodized aluminum under 5%, and foliage even less, all of which negatively impact range. Background illumination also plays a significant role; indoor compatibility is typically specified in klx, while direct sunlight can reach 100 klx, exceeding many modules' specifications. Atmospheric conditions, such as visibility in kilometers, can further diminish range, with heavy rain or fog causing complete loss of returns.
Integration time and rate are another set of factors affecting range. Faster streams with higher integration times can achieve greater ranges, but integrating data from a high-frequency stream differs from a single-shot measurement. Consequently, the fastest module and the longest-range module may not be the same product. When evaluating lidar systems, it is essential to request the specific conditions under which each range figure was obtained to ensure accurate comparisons.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
